Merge branch 'development' into beta-release-restrictedmbed-os-beta

* development:
  Bump yotta patch version
  Merging iotssl-457-badtail with development branch
  Moe top-level Readme to markdown
  Changelog entry fro the previous commit
  Add NULL checks to top-level SSL functions
  Skip to trusted certs early in the chain
  Add tests for verify callback
  Improve mbedtls_ssl_write() documentation
  Add mbedtls_ssl_get_max_frag_len()
  Print "thread ID" in debug messages
  Only use -Wshadow with GCC 4.8 or higher
  Fix error reporting in pkey/pk_* programs
  Fix more comments/outputs in verify programs
  Fix hash buffer size in pkey programs
  Change default RSA key size in rsa_genkey
  Fix comments about filenames in some programs
  Fix memory corruption in rsa sign/verify programs
  Fix warning with MD/SHA ALT implementation
  Fix handling of long PSK identities
  Fix -Wshadow warnings

44 files changed, 1006 insertions, 336 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8673729..094d906 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,6 +29,9 @@ if(CMAKE_COMPILER_IS_GNUCC)
     if (GCC_VERSION VERSION_GREATER 4.5 OR GCC_VERSION VERSION_EQUAL 4.5)
         set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wlogical-op")
     endif()
+    if (GCC_VERSION VERSION_GREATER 4.8 OR GCC_VERSION VERSION_EQUAL 4.8)
+        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wshadow")
+    endif()
     set(CMAKE_C_FLAGS_RELEASE     "-O2")
     set(CMAKE_C_FLAGS_DEBUG       "-O0 -g3")
     set(CMAKE_C_FLAGS_COVERAGE    "-O0 -g3 --coverage")
@@ -39,7 +42,7 @@ if(CMAKE_COMPILER_IS_GNUCC)
 endif(CMAKE_COMPILER_IS_GNUCC)
 
 if(CMAKE_COMPILER_IS_CLANG)
-    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -W -Wdeclaration-after-statement -Wwrite-strings -Wpointer-arith -Wimplicit-fallthrough")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -W -Wdeclaration-after-statement -Wwrite-strings -Wpointer-arith -Wimplicit-fallthrough -Wshadow")
     set(CMAKE_C_FLAGS_RELEASE     "-O2")
     set(CMAKE_C_FLAGS_DEBUG       "-O0 -g3")
     set(CMAKE_C_FLAGS_COVERAGE    "-O0 -g3 --coverage")
diff --git a/ChangeLog b/ChangeLog
index e318bcb..ef290e7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -29,12 +29,26 @@ Bugfix
    * Fix bug in mbedtls_rsa_public() and mbedtls_rsa_private() that could
      result trying to unlock an unlocked mutex on invalid input (found by
      Fredrik Axelsson) (#257)
+   * Fix -Wshadow warnings (found by hnrkp) (#240)
+   * Fix memory corruption on client with overlong PSK identity, around
+     SSL_MAX_CONTENT_LEN or higher - not triggerrable remotely (found by
+     Aleksandrs Saveljevs) (#238)
+   * Fix unused function warning when using MBEDTLS_MDx_ALT or
+     MBEDTLS_SHAxxx_ALT (found by Henrik) (#239)
+   * Fix memory corruption in pkey programs (found by yankuncheng) (#210)
 
 Changes
    * The PEM parser now accepts a trailing space at end of lines (#226).
    * It is now possible to #include a user-provided configuration file at the
      end of the default config.h by defining MBEDTLS_USER_CONFIG_FILE on the
      compiler's command line.
+   * When verifying a certificate chain, if an intermediate certificate is
+     trusted, no later cert is checked. (suggested by hannes-landeholm)
+     (#220).
+   * Prepend a "thread identifier" to debug messages (issue pointed out by
+     Hugo Leisink) (#210).
+   * Add mbedtls_ssl_get_max_frag_len() to query the current maximum fragment
+     length.
 
 = mbed TLS 2.0.0 released 2015-07-13
 
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..79943d1
--- /dev/null
+++ b/README.md
@@ -0,0 +1,172 @@
+README for mbed TLS
+===================
+
+Configuration
+-------------
+
+mbed TLS should build out of the box on most systems. Some platform specific options are available in the fully-documented configuration file `include/mbedtls/config.h`, which is also the place where features can be selected. This file can be edited manually, or in a more programmatic way using the Perl script `scripts/config.pl` (use `--help` for usage instructions).
+
+Compiler options can be set using standard variables such as `CC` and `CFLAGS` when using the Make and CMake build system (see below).
+
+Compiling
+---------
+
+There are currently four active build systems within the mbed TLS releases:
+
+-   yotta
+-   Make
+-   CMake
+-   Microsoft Visual Studio (Visual Studio 6 and Visual Studio 2010)
+
+The main systems used for development are CMake and yotta. Those systems are always complete and up-to-date. The others should reflect all changes present in the CMake and yotta build system, but some features are not ported there by default.
+
+Please note that the yotta option is slightly different from the other build systems:
+
+-   a more minimalistic configuration file is used by default
+-   depending on the yotta target, features of mbed OS will be used in examples and tests
+
+The Make and CMake build systems create three libraries: libmbedcrypto, libmbedx509, and libmbedtls. Note that libmbedtls depends on libmbedx509 and libmbedcrypto, and libmbedx509 depends on libmbedcrypto. As a result, some linkers will expect flags to be in a specific order, for example the GNU linker wants `-lmbedtls -lmbedx509 -lmbedcrypto`. Also, when loading shared libraries using dlopen(), you'll need to load libmbedcrypto first, then libmbedx509, before you can load libmbedtls.
+
+### Yotta
+
+[yotta](http://yottabuild.org) is a package manager and build system developped by mbed; it is the build system of mbed OS. To install it on your platform, please follow the yotta [installation instructions](http://docs.yottabuild.org/#installing).
+
+Once yotta is installed, you can use it to download the latest version of mbed TLS form the yotta registry with:
+
+    yotta install mbedtls
+
+and build it with:
+
+    yotta build
+
+If, on the other hand, you already have a copy of mbed TLS from a source other than the yotta registry, for example from cloning our github repository, or from downloading a tarball of the standalone edition, then you'll need first need to generate the yotta module by running:
+
+    yotta/create-module.sh
+
+from the mbed TLS root directory. This will create the yotta module in the `yotta/module` directory. You can then change to that directory and build as usual:
+
+    cd yotta/module
+    yotta build
+
+In any case, you'll probably want to set the yotta target before building unless it's already set globally; for more information on using yotta, please consult the [yotta documentation](http://docs.yottabuild.org/).
+
+The yotta edition of mbed TLS includes a few example programs, some of which demonstrate integration with mbed OS; for more details, please consult the [Readme at the root of the yotta module](https://github.com/ARMmbed/mbedtls/blob/development/yotta/data/README.md).
+
+### Make
+
+We intentionally only use the absolute minimum of `Make` functionality, as a lot of `Make` features are not supported on all different implementations of Make on different platforms. As such, the Makefiles sometimes require some handwork or export statements in order to work for your platform.
+
+In order to build the source using Make, just enter at the command line:
+
+    make
+
+In order to run the tests, enter:
+
+    make check
+
+The tests need Perl to be built and run. If you don't have Perl installed, you can skip buiding the tests with:
+
+    make no_test
+
+You'll still be able to run a much smaller set of tests with:
+
+    programs/test/selftest
+
+In order to build for a Windows platform, you should use `WINDOWS_BUILD=1` if the target is Windows but the build environment is Unix-like (for instance when cross-compiling, or compiling from an MSYS shell), and `WINDOWS=1` if the build environment is a Windows shell (for instance using mingw32-make) (in that case some targets will not be available).
+
+Setting the variable `SHARED` in your environment will build shared libraries in addition to the static libraries. Setting `DEBUG` gives you a debug build. You can override `CFLAGS` and `LDFLAGS` by setting them in your environment or on the make command line; if you do so, essential parts such as `-I` will still be preserved. Warning options may be overridden separately using `WARNING_CFLAGS`.
+
+Depending on your platform, you might run into some issues. Please check the Makefiles in `library/`, `programs/` and `tests/` for options to manually add or remove for specific platforms. You can also check [the mbed TLS Knowledge Base](https://tls.mbed.org/kb) for articles on your platform or issue.
+
+In case you find that you need to do something else as well, please let us know what, so we can add it to the KB.
+
+### CMake
+
+In order to build the source using CMake, just enter at the command line:
+
+    cmake .
+    make
+
+In order to run the tests, enter:
+
+    make test
+
+The test suites need Perl to be built. If you don't have Perl installed, you'll want to disable the test suites with:
+
+    cmake -DENABLE_TESTING=Off .
+
+If you disabled the test suites, but kept the programs enabled, you can still run a much smaller set of tests with:
+
+    programs/test/selftest
+
+To configure CMake for building shared libraries, use:
+
+    cmake -DUSE_SHARED_MBEDTLS_LIBRARY=On .
+
+There are many different build modes available within the CMake buildsystem. Most of them are available for gcc and clang, though some are compiler-specific:
+
+-   Release. This generates the default code without any unnecessary information in the binary files.
+-   Debug. This generates debug information and disables optimization of the code.
+-   Coverage. This generates code coverage information in addition to debug information.
+-   ASan. This instruments the code with AddressSanitizer to check for memory errors. (This includes LeakSanitizer, with recent version of gcc and clang.) (With recent version of clang, this mode also instruments the code with UndefinedSanitizer to check for undefined behaviour.)
+-   ASanDbg. Same as ASan but slower, with debug information and better stack traces.
+-   MemSan. This instruments the code with MemorySanitizer to check for uninitialised memory reads. Experimental, needs recent clang on Linux/x86\_64.
+-   MemSanDbg. Same as MemSan but slower, with debug information, better stack traces and origin tracking.
+-   Check. This activates the compiler warnings that depend on optimization and treats all warnings as errors.
+
+Switching build modes in CMake is simple. For debug mode, enter at the command line:
+
+    cmake -D CMAKE_BUILD_TYPE=Debug .
+
+To list other available CMake options, use:
+
+    cmake -LH
+
+Note that, with CMake, if you want to change the compiler or its options after you already ran CMake, you need to clear its cache first, eg (using GNU find):
+
+    find . -iname '*cmake*' -not -name CMakeLists.txt -exec rm -rf {} +
+    CC=gcc CFLAGS='-fstack-protector-strong -Wa,--noexecstack' cmake .
+
+### Microsoft Visual Studio
+
+The build files for Microsoft Visual Studio are generated for Visual Studio 2010.
+
+The solution file `mbedTLS.sln` contains all the basic projects needed to build the library and all the programs. The files in tests are not generated and compiled, as these need a perl environment as well. However, the selftest program in `programs/test/` is still available.
+
+Example programs
+----------------
+
+We've included example programs for a lot of different features and uses in `programs/`. Most programs only focus on a single feature or usage scenario, so keep that in mind when copying parts of the code.
+
+Tests
+-----
+
+mbed TLS includes an elaborate test suite in `tests/` that initially requires Perl to generate the tests files (e.g. `test\_suite\_mpi.c`). These files are generated from a `function file` (e.g. `suites/test\_suite\_mpi.function`) and a `data file` (e.g. `suites/test\_suite\_mpi.data`). The `function file` contains the test functions. The `data file` contains the test cases, specified as parameters that will be passed to the test function.
+
+For machines with a Unix shell and OpenSSL (and optionally GnuTLS) installed, additional test scripts are available:
+
+-   `tests/ssl-opt.sh` runs integration tests for various TLS options (renegotiation, resumption, etc.) and tests interoperability of these options with other implementations.
+-   `tests/compat.sh` tests interoperability of every ciphersuite with other implementations.
+-   `tests/scripts/test-ref-configs.pl` test builds in various reduced configurations.
+-   `tests/scripts/all.sh` runs a combination of the above tests, plus some more, with various build options (such as ASan, full `config.h`, etc).
+
+Configurations
+--------------
+
+We provide some non-standard configurations focused on specific use cases in the `configs/` directory. You can read more about those in `configs/README.txt`
+
+Contributing
+------------
+
+We gratefully accept bug reports and contributions from the community. There are some requirements we need to fulfill in order to be able to integrate contributions:
+
+-   Simple bug fixes to existing code do not contain copyright themselves and we can integrate without issue. The same is true of trivial contributions.
+-   For larger contributions, such as a new feature, the code can possibly fall under copyright law. We then need your consent to share in the ownership of the copyright. We have a form for this, which we will send to you in case you submit a contribution or pull request that we deem this necessary for.
+
+### Process
+
+1.  [Check for open issues](https://github.com/ARMmbed/mbedtls/issues) or [start a discussion](https://tls.mbed.org/discussions) around a feature idea or a bug.
+2.  Fork the [mbed TLS repository on GitHub](https://github.com/ARMmbed/mbedtls) to start making your changes. As a general rule, you should use the "development" branch as a basis.
+3.  Write a test which shows that the bug was fixed or that the feature works as expected.
+4.  Send a pull request and bug us until it gets merged and published. We will include your name in the ChangeLog :)
+
diff --git a/README.rst b/README.rst
deleted file mode 100644
index ceb92c4..0000000
--- a/README.rst
+++ /dev/null
@@ -1,199 +0,0 @@
-===================
-README for mbed TLS
-===================
-
-Configuration
-=============
-
-mbed TLS should build out of the box on most systems. Some platform specific options are available in the fully-documented configuration file *include/mbedtls/config.h*, which is also the place where features can be selected.
-This file can be edited manually, or in a more programmatic way using the Perl
-script *scripts/config.pl* (use *--help* for usage instructions).
-
-Compiler options can be set using standard variables such as *CC* and *CFLAGS* when using the Make and CMake build system (see below).
-
-Compiling
-=========
-
-There are currently four active build systems within the mbed TLS releases:
-
-- yotta
-- Make
-- CMake
-- Microsoft Visual Studio (Visual Studio 6 and Visual Studio 2010)
-
-The main systems used for development are CMake and yotta. Those systems are always complete and up-to-date. The others should reflect all changes present in the CMake and yotta build system, but some features are not ported there by default.
-
-Please note that the yotta option is slightly different from the other build systems:
-
-- a more minimalistic configuration file is used by default
-- depending on the yotta target, features of mbed OS will be used in examples and tests
-
-The Make and CMake build systems create three libraries: libmbedcrypto, libmbedx509, and libmbedtls. Note that libmbedtls depends on libmbedx509 and libmbedcrypto, and libmbedx509 depends on libmbedcrypto. As a result, some linkers will expect flags to be in a specific order, for example the GNU linker wants `-lmbedtls -lmbedx509 -lmbedcrypto`. Also, when loading shared libraries using `dlopen()`, you'll need to load `libmbedcrypto` first, then `libmbedx509`, before you can load `libmbedtls`.
-
-Yotta
------
-
-`yotta <http://yottabuild.org>` is a package manager and build system developped by mbed; it is the build system of mbed OS. To install it on your platform, please follow the `yotta installation instructions <http://docs.yottabuild.org/#installing>`.
-
-Once yotta is installed, you can use it to download the latest version of mbed TLS form the yotta registry with::
-
-    yotta install mbedtls
-
-and build it with::
-
-    yotta build
-
-If, on the other hand, you already have a copy of mbed TLS from a source other than the yotta registry, for example from cloning our github repository, or from downloading a tarball of the standalone edition, then you'll need first need to generate the yotta module by running::
-
-    yotta/create-module.sh
-
-from the mbed TLS root directory. This will create the yotta module in the *yotta/module* directory. You can then change to that directory and build as usual::
-
-    cd yotta/module
-    yotta build
-
-In any case, you'll probably want to set the yotta target before building unless it's already set globally; for more information on using yotta, please consult the `yotta documentation <http://docs.yottabuild.org/>`.
-
-The yotta edition of mbed TLS includes a few example programs, some of which demonstrate integration with mbed OS; for more details, please consult the `Readme at the root of the yotta module <https://github.com/ARMmbed/mbedtls/blob/development/yotta/data/README.md>`.
-
-Make
-----
-
-We intentionally only use the absolute minimum of **Make** functionality, as we have discovered that a lot of **Make** features are not supported on all different implementations of Make on different platforms. As such, the Makefiles sometimes require some handwork or `export` statements in order to work for your platform.
-
-In order to build the source using Make, just enter at the command line::
-
-    make
-
-In order to run the tests, enter::
-
-    make check
-
-The tests need Perl to be built and run. If you don't have Perl installed, you can skip buiding the tests with::
-
-    make no_test
-
-You'll still be able to run a much smaller set of tests with::
-
-    programs/test/selftest
-
-In order to build for a Windows platform, you should use WINDOWS_BUILD=1 if the target is Windows but the build environment is Unix-like (for instance when cross-compiling, or compiling from an MSYS shell), and WINDOWS=1 if the build environment is a Windows shell (for instance using mingw32-make) (in that case some targets will not be available).
-
-Setting the variable SHARED in your environment will build shared libraries in addition to the static libraries. Setting DEBUG gives you a debug build.  You can override CFLAGS and LDFLAGS by setting them in your environment or on the make command line; if you do so, essential parts such as -I will still be preserved.  Warning options may be overridden separately using WARNING_CFLAGS.
-
-Depending on your platform, you might run into some issues. Please check the Makefiles in *library/*, *programs/* and *tests/* for options to manually add or remove for specific platforms. You can also check `the mbed TLS Knowledge Base <https://tls.mbed.org/kb>`_ for articles on your platform or issue.
-
-In case you find that you need to do something else as well, please let us know what, so we can add it to the KB.
-
-CMake
------
-
-In order to build the source using CMake, just enter at the command line::
-
-    cmake .
-    make
-
-In order to run the tests, enter::
-
-    make test
-
-The test suites need Perl to be built. If you don't have Perl installed, you'll want to disable the test suites with::
-
-    cmake -DENABLE_TESTING=Off .
-
-If you disabled the test suites, but kept the programs enabled, you can still run a much smaller set of tests with::
-
-    programs/test/selftest
-
-To configure CMake for building shared libraries, use::
-
-    cmake -DUSE_SHARED_MBEDTLS_LIBRARY=On .
-
-There are many different build modes available within the CMake buildsystem. Most of them are available for gcc and clang, though some are compiler-specific:
-
-- Release.
-  This generates the default code without any unnecessary information in the binary files.
-- Debug.
-  This generates debug information and disables optimization of the code.
-- Coverage.
-  This generates code coverage information in addition to debug information.
-- ASan.
-  This instruments the code with AddressSanitizer to check for memory errors.
-  (This includes LeakSanitizer, with recent version of gcc and clang.)
-  (With recent version of clang, this mode also instruments the code with
-  UndefinedSanitizer to check for undefined behaviour.)
-- ASanDbg.
-  Same as ASan but slower, with debug information and better stack traces.
-- MemSan.
-  This instruments the code with MemorySanitizer to check for uninitialised
-  memory reads. Experimental, needs recent clang on Linux/x86_64.
-- MemSanDbg.
-  Same as MemSan but slower, with debug information, better stack traces and
-  origin tracking.
-- Check.
-  This activates the compiler warnings that depend on optimization and treats
-  all warnings as errors.
-
-Switching build modes in CMake is simple. For debug mode, enter at the command line::
-
-    cmake -D CMAKE_BUILD_TYPE=Debug .
-
-To list other available CMake options, use::
-
-    cmake -LH
-
-Note that, with CMake, if you want to change the compiler or its options after you already ran CMake, you need to clear its cache first, eg (using GNU find)::
-
-    find . -iname '*cmake*' -not -name CMakeLists.txt -exec rm -rf {} +
-    CC=gcc CFLAGS='-fstack-protector-strong -Wa,--noexecstack' cmake .
-
-Microsoft Visual Studio
------------------------
-
-The build files for Microsoft Visual Studio are generated for Visual Studio 2010.
-
-The solution file 'mbedTLS.sln' contains all the basic projects needed to build the library and all the programs. The files in tests are not generated and compiled, as these need a perl environment as well. However, the `selftest` program in *programs/test/* is still available.
-
-Example programs
-================
-
-We've included example programs for a lot of different features and uses in *programs/*. Most programs only focus on a single feature or usage scenario, so keep that in mind when copying parts of the code.
-
-Tests
-=====
-
-mbed TLS includes an elaborate test suite in *tests/* that initially requires Perl to generate the tests files (e.g. *test_suite_mpi.c*). These files are generated from a **function file** (e.g. *suites/test_suite_mpi.function*) and a **data file** (e.g. *suites/test_suite_mpi.data*). The **function file** contains the test functions. The **data file** contains the test cases, specified as parameters that will be passed to the test function.
-
-For machines with a Unix shell and OpenSSL (and optionally GnuTLS) installed, additional test scripts are available:
-
-- *tests/ssl-opt.sh* runs integration tests for various TLS options (renegotiation, resumption, etc.) and tests interoperability of these options with other implementations.
-- *tests/compat.sh* tests interoperability of every ciphersuite with other implementations.
-- *tests/scripts/test-ref-configs.pl* test builds in various reduced configurations.
-- *tests/scripts/all.sh* runs a combination of the above tests, plus some more, with various build options (such as ASan, full *config.h*, etc).
-
-Configurations
-==============
-
-We provide some non-standard configurations focused on specific use cases in the configs/ directory. You can read more about those in configs/README.txt
-
-Contributing
-============
-
-We gratefully accept bug reports and contributions from the community. There are some requirements we need to fulfill in order to be able to integrate contributions:
-
-- Simple bug fixes to existing code do not contain copyright themselves and we can integrate without issue. The same is true of trivial contributions.
-
-- For larger contributions, such as a new feature, the code can possibly fall under copyright law. We then need your consent to share in the ownership of the copyright. We have a form for this, which we will send to you in case you submit a contribution or pull request that we deem this necessary for.
-
-Process
--------
-#. `Check for open issues <https://github.com/ARMmbed/mbedtls/issues>`_ or
-   `start a discussion <https://tls.mbed.org/discussions>`_ around a feature
-   idea or a bug.
-#. Fork the `mbed TLS repository on GitHub <https://github.com/ARMmbed/mbedtls>`_
-   to start making your changes. As a general rule, you should use the
-   "development" branch as a basis.
-#. Write a test which shows that the bug was fixed or that the feature works
-   as expected.
-#. Send a pull request and bug us until it gets merged and published. We will
-   include your name in the ChangeLog :)
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 9c482d3..bd88918 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -2026,6 +2026,26 @@ const char *mbedtls_ssl_get_version( const mbedtls_ssl_context *ssl );
  */
 int mbedtls_ssl_get_record_expansion( const mbedtls_ssl_context *ssl );
 
+#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
+/**
+ * \brief          Return the maximum fragment length (payload, in bytes).
+ *                 This is the value negotiated with peer if any,
+ *                 or the locally configured value.
+ *
+ * \note           With DTLS, \c mbedtls_ssl_write() will return an error if
+ *                 called with a larger length value.
+ *                 With TLS, \c mbedtls_ssl_write() will fragment the input if
+ *                 necessary and return the number of bytes written; it is up
+ *                 to the caller to call \c mbedtls_ssl_write() again in
+ *                 order to send the remaining bytes if any.
+ *
+ * \param ssl      SSL context
+ *
+ * \return         Current maximum fragment length.
+ */
+size_t mbedtls_ssl_get_max_frag_len( const mbedtls_ssl_context *ssl );
+#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
+
 #if defined(MBEDTLS_X509_CRT_PARSE_C)
 /**
  * \brief          Return the peer certificate from the current connection
@@ -2123,26 +2143,33 @@ int mbedtls_ssl_renegotiate( mbedtls_ssl_context *ssl );
 int mbedtls_ssl_read( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len );
 
 /**
- * \brief          Write exactly 'len' application data bytes
+ * \brief          Try to write exactly 'len' application data bytes
+ *
+ * \warning        This function will do partial writes in some cases. If the
+ *                 return value is non-negative but less than length, the
+ *                 function must be called again with updated arguments:
+ *                 buf + ret, len - ret (if ret is the return value) until
+ *                 it returns a value equal to the last 'len' argument.
  *
  * \param ssl      SSL context
  * \param buf      buffer holding the data
  * \param len      how many bytes must be written
  *
- * \return         the number of bytes written,
- *                 or a negative error code.
+ * \return         the number of bytes actually written (may be less than len),
+ *                 or MBEDTLS_ERR_SSL_WANT_WRITE of MBEDTLS_ERR_SSL_WANT_READ,
+ *                 or another negative error code.
  *
- * \note           When this function returns MBEDTLS_ERR_SSL_WANT_WRITE,
+ * \note           When this function returns MBEDTLS_ERR_SSL_WANT_WRITE/READ,
  *                 it must be called later with the *same* arguments,
  *                 until it returns a positive value.
  *
  * \note           If the requested length is greater than the maximum
  *                 fragment length (either the built-in limit or the one set
  *                 or negotiated with the peer), then:
- *                 - with TLS, less bytes than requested are written. (In
- *                 order to write larger messages, this function should be
- *                 called in a loop.)
+ *                 - with TLS, less bytes than requested are written.
  *                 - with DTLS, MBEDTLS_ERR_SSL_BAD_INPUT_DATA is returned.
+ *                 \c mbedtls_ssl_get_max_frag_len() may be used to query the
+ *                 active maximum fragment length.
  */
 int mbedtls_ssl_write( mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len );
 
diff --git a/library/debug.c b/library/debug.c
index 84b9557..070f63a 100644
--- a/library/debug.c
+++ b/library/debug.c
@@ -42,6 +42,10 @@
 #define mbedtls_snprintf    snprintf
 #endif
 
+#if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && !defined(inline)
+#define inline __inline
+#endif
+
 #define DEBUG_BUF_SIZE      512
 
 static int debug_threshold = 0;
@@ -51,6 +55,27 @@ void mbedtls_debug_set_threshold( int threshold )
     debug_threshold = threshold;
 }
 
+/*
+ * All calls to f_dbg must be made via this function
+ */
+static inline void debug_send_line( const mbedtls_ssl_context *ssl, int level,
+                                    const char *file, int line,
+                                    const char *str )
+{
+    /*
+     * If in a threaded environment, we need a thread identifier.
+     * Since there is no portable way to get one, use the address of the ssl
+     * context instead, as it shouldn't be shared between threads.
+     */
+#if defined(MBEDTLS_THREADING_C)
+    char idstr[20 + DEBUG_BUF_SIZE]; /* 0x + 16 nibbles + ': ' */
+    mbedtls_snprintf( idstr, sizeof( idstr ), "%p: %s", ssl, str );
+    ssl->conf->f_dbg( ssl->conf->p_dbg, level, file, line, idstr );
+#else
+    ssl->conf->f_dbg( ssl->conf->p_dbg, level, file, line, str );
+#endif
+}
+
 void mbedtls_debug_print_msg( const mbedtls_ssl_context *ssl, int level,
                               const char *file, int line,
                               const char *format, ... )
@@ -85,7 +110,7 @@ void mbedtls_debug_print_msg( const mbedtls_ssl_context *ssl, int level,
         str[ret + 1] = '\0';
     }
 
-    ssl->conf->f_dbg( ssl->conf->p_dbg, level, file, line, str );
+    debug_send_line( ssl, level, file, line, str );
 }
 
 void mbedtls_debug_print_ret( const mbedtls_ssl_context *ssl, int level,
@@ -108,7 +133,7 @@ void mbedtls_debug_print_ret( const mbedtls_ssl_context *ssl, int level,
     mbedtls_snprintf( str, sizeof( str ), "%s() returned %d (-0x%04x)\n",
               text, ret, -ret );
 
-    ssl->conf->f_dbg( ssl->conf->p_dbg, level, file, line, str );
+    debug_send_line( ssl, level, file, line, str );
 }
 
 void mbedtls_debug_print_buf( const mbedtls_ssl_context *ssl, int level,
@@ -125,7 +150,7 @@ void mbedtls_debug_print_buf( const mbedtls_ssl_context *ssl, int level,
     mbedtls_snprintf( str + idx, sizeof( str ) - idx, "dumping '%s' (%u bytes)\n",
               text, (unsigned int) len );
 
-    ssl->conf->f_dbg( ssl->conf->p_dbg, level, file, line, str );
+    debug_send_line( ssl, level, file, line, str );
 
     idx = 0;
     memset( txt, 0, sizeof( txt ) );
@@ -139,7 +164,7 @@ void mbedtls_debug_print_buf( const mbedtls_ssl_context *ssl, int level,
             if( i > 0 )
             {
                 mbedtls_snprintf( str + idx, sizeof( str ) - idx, "  %s\n", txt );
-                ssl->conf->f_dbg( ssl->conf->p_dbg, level, file, line, str );
+                debug_send_line( ssl, level, file, line, str );
 
                 idx = 0;
                 memset( txt, 0, sizeof( txt ) );
@@ -161,7 +186,7 @@ void mbedtls_debug_print_buf( const mbedtls_ssl_context *ssl, int level,
             idx += mbedtls_snprintf( str + idx, sizeof( str ) - idx, "   " );
 
         mbedtls_snprintf( str + idx, sizeof( str ) - idx, "  %s\n", txt );
-        ssl->conf->f_dbg( ssl->conf->p_dbg, level, file, line, str );
+        debug_send_line( ssl, level, file, line, str );
     }
 }
 
@@ -206,7 +231,7 @@ void mbedtls_debug_print_mpi( const mbedtls_ssl_context *ssl, int level,
     mbedtls_snprintf( str + idx, sizeof( str ) - idx, "value of '%s' (%d bits) is:\n",
               text, (int) ( ( n * ( sizeof(mbedtls_mpi_uint) << 3 ) ) + j + 1 ) );
 
-    ssl->conf->f_dbg( ssl->conf->p_dbg, level, file, line, str );
+    debug_send_line( ssl, level, file, line, str );
 
     idx = 0;
     for( i = n + 1, j = 0; i > 0; i-- )
@@ -226,7 +251,7 @@ void mbedtls_debug_print_mpi( const mbedtls_ssl_context *ssl, int level,
                 if( j > 0 )
                 {
                     mbedtls_snprintf( str + idx, sizeof( str ) - idx, "\n" );
-                    ssl->conf->f_dbg( ssl->conf->p_dbg, level, file, line, str );
+                    debug_send_line( ssl, level, file, line, str );
                     idx = 0;
                 }
             }
@@ -243,7 +268,7 @@ void mbedtls_debug_print_mpi( const mbedtls_ssl_context *ssl, int level,
         idx += mbedtls_snprintf( str + idx, sizeof( str ) - idx, " 00" );
 
     mbedtls_snprintf( str + idx, sizeof( str ) - idx, "\n" );
-    ssl->conf->f_dbg( ssl->conf->p_dbg, level, file, line, str );
+    debug_send_line( ssl, level, file, line, str );
 }
 #endif /* MBEDTLS_BIGNUM_C */
 
@@ -260,7 +285,7 @@ static void debug_print_pk( const mbedtls_ssl_context *ssl, int level,
 
     if( mbedtls_pk_debug( pk, items ) != 0 )
     {
-        ssl->conf->f_dbg( ssl->conf->p_dbg, level, file, line,
+        debug_send_line( ssl, level, file, line,
                           "invalid PK context\n" );
         return;
     }
@@ -281,7 +306,7 @@ static void debug_print_pk( const mbedtls_ssl_context *ssl, int level,
             mbedtls_debug_print_ecp( ssl, level, file, line, name, items[i].value );
         else
 #endif
-            ssl->conf->f_dbg( ssl->conf->p_dbg, level, file, line,
+            debug_send_line( ssl, level, file, line,
                               "should not happen\n" );
     }
 }
@@ -304,7 +329,7 @@ static void debug_print_line_by_line( const mbedtls_ssl_context *ssl, int level,
             memcpy( str, start, len );
             str[len] = '\0';
 
-            ssl->conf->f_dbg( ssl->conf->p_dbg, level, file, line, str );
+            debug_send_line( ssl, level, file, line, str );
 
             start = cur + 1;
         }
@@ -326,7 +351,7 @@ void mbedtls_debug_print_crt( const mbedtls_ssl_context *ssl, int level,
         char buf[1024];
 
         mbedtls_snprintf( str, sizeof( str ), "%s #%d:\n", text, ++i );
-        ssl->conf->f_dbg( ssl->conf->p_dbg, level, file, line, str );
+        debug_send_line( ssl, level, file, line, str );
 
         mbedtls_x509_crt_info( buf, sizeof( buf ) - 1, "", crt );
         debug_print_line_by_line( ssl, level, file, line, buf );
diff --git a/library/entropy_poll.c b/library/entropy_poll.c
index f0e32b3..25a27be 100644
--- a/library/entropy_poll.c
+++ b/library/entropy_poll.c
@@ -139,7 +139,7 @@ int mbedtls_platform_entropy_poll( void *data,
                            unsigned char *output, size_t len, size_t *olen )
 {
     FILE *file;
-    size_t ret;
+    size_t read_len;
     ((void) data);
 
 #if defined(HAVE_GETRANDOM)
@@ -164,8 +164,8 @@ int mbedtls_platform_entropy_poll( void *data,
     if( file == NULL )
         return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
 
-    ret = fread( output, 1, len, file );
-    if( ret != len )
+    read_len = fread( output, 1, len, file );
+    if( read_len != len )
     {
         fclose( file );
         return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
diff --git a/library/md2.c b/library/md2.c
index 51fb610..8976701 100644
--- a/library/md2.c
+++ b/library/md2.c
@@ -46,13 +46,13 @@
 #endif /* MBEDTLS_PLATFORM_C */
 #endif /* MBEDTLS_SELF_TEST */
 
+#if !defined(MBEDTLS_MD2_ALT)
+
 /* Implementation that should never be optimized out by the compiler */
 static void mbedtls_zeroize( void *v, size_t n ) {
     volatile unsigned char *p = v; while( n-- ) *p++ = 0;
 }
 
-#if !defined(MBEDTLS_MD2_ALT)
-
 static const unsigned char PI_SUBST[256] =
 {
     0x29, 0x2E, 0x43, 0xC9, 0xA2, 0xD8, 0x7C, 0x01, 0x3D, 0x36,
diff --git a/library/md4.c b/library/md4.c
index b0869e6..11a77e3 100644
--- a/library/md4.c
+++ b/library/md4.c
@@ -46,13 +46,13 @@
 #endif /* MBEDTLS_PLATFORM_C */
 #endif /* MBEDTLS_SELF_TEST */
 
+#if !defined(MBEDTLS_MD4_ALT)
+
 /* Implementation that should never be optimized out by the compiler */
 static void mbedtls_zeroize( void *v, size_t n ) {
     volatile unsigned char *p = v; while( n-- ) *p++ = 0;
 }
 
-#if !defined(MBEDTLS_MD4_ALT)
-
 /*
  * 32-bit integer manipulation macros (little endian)
  */
diff --git a/library/md5.c b/library/md5.c
index f430505..5d972dc 100644
--- a/library/md5.c
+++ b/library/md5.c
@@ -45,13 +45,13 @@
 #endif /* MBEDTLS_PLATFORM_C */
 #endif /* MBEDTLS_SELF_TEST */
 
+#if !defined(MBEDTLS_MD5_ALT)
+
 /* Implementation that should never be optimized out by the compiler */
 static void mbedtls_zeroize( void *v, size_t n ) {
     volatile unsigned char *p = v; while( n-- ) *p++ = 0;
 }
 
-#if !defined(MBEDTLS_MD5_ALT)
-
 /*
  * 32-bit integer manipulation macros (little endian)
  */
diff --git a/library/sha1.c b/library/sha1.c
index c8aec35..8c77cba 100644
--- a/library/sha1.c
+++ b/library/sha1.c
@@ -45,13 +45,13 @@
 #endif /* MBEDTLS_PLATFORM_C */
 #endif /* MBEDTLS_SELF_TEST */
 
+#if !defined(MBEDTLS_SHA1_ALT)
+
 /* Implementation that should never be optimized out by the compiler */
 static void mbedtls_zeroize( void *v, size_t n ) {
     volatile unsigned char *p = v; while( n-- ) *p++ = 0;
 }
 
-#if !defined(MBEDTLS_SHA1_ALT)
-
 /*
  * 32-bit integer manipulation macros (big endian)
  */
diff --git a/library/sha256.c b/library/sha256.c
index 933faa0..4e82c0b 100644
--- a/library/sha256.c
+++ b/library/sha256.c
@@ -45,13 +45,13 @@
 #endif /* MBEDTLS_PLATFORM_C */
 #endif /* MBEDTLS_SELF_TEST */
 
+#if !defined(MBEDTLS_SHA256_ALT)
+
 /* Implementation that should never be optimized out by the compiler */
 static void mbedtls_zeroize( void *v, size_t n ) {
     volatile unsigned char *p = v; while( n-- ) *p++ = 0;
 }
 
-#if !defined(MBEDTLS_SHA256_ALT)
-
 /*
  * 32-bit integer manipulation macros (big endian)
  */
diff --git a/library/sha512.c b/library/sha512.c
index 87c9197..af610bb 100644
--- a/library/sha512.c
+++ b/library/sha512.c
@@ -51,13 +51,13 @@
 #endif /* MBEDTLS_PLATFORM_C */
 #endif /* MBEDTLS_SELF_TEST */
 
+#if !defined(MBEDTLS_SHA512_ALT)
+
 /* Implementation that should never be optimized out by the compiler */
 static void mbedtls_zeroize( void *v, size_t n ) {
     volatile unsigned char *p = v; while( n-- ) *p++ = 0;
 }
 
-#if !defined(MBEDTLS_SHA512_ALT)
-
 /*
  * 64-bit integer manipulation macros (big endian)
  */
diff --git a/library/ssl_cli.c b/library/ssl_cli.c
index 1a7f9e4..5a9c432 100644
--- a/library/ssl_cli.c
+++ b/library/ssl_cli.c
@@ -1747,6 +1747,12 @@ static int ssl_write_encrypted_pms( mbedtls_ssl_context *ssl,
     size_t len_bytes = ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ? 0 : 2;
     unsigned char *p = ssl->handshake->premaster + pms_offset;
 
+    if( offset + len_bytes > MBEDTLS_SSL_MAX_CONTENT_LEN )
+    {
+        MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small for encrypted pms" ) );
+        return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
+    }
+
     /*
      * Generate (part of) the pre-master as
      *  struct {
@@ -2521,6 +2527,14 @@ static int ssl_write_client_key_exchange( mbedtls_ssl_context *ssl )
 
         i = 4;
         n = ssl->conf->psk_identity_len;
+
+        if( i + 2 + n > MBEDTLS_SSL_MAX_CONTENT_LEN )
+        {
+            MBEDTLS_SSL_DEBUG_MSG( 1, ( "psk identity too long or "
+                                        "SSL buffer too short" ) );
+            return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
+        }
+
         ssl->out_msg[i++] = (unsigned char)( n >> 8 );
         ssl->out_msg[i++] = (unsigned char)( n      );
 
@@ -2549,6 +2563,14 @@ static int ssl_write_client_key_exchange( mbedtls_ssl_context *ssl )
              * ClientDiffieHellmanPublic public (DHM send G^X mod P)
              */
             n = ssl->handshake->dhm_ctx.len;
+
+            if( i + 2 + n > MBEDTLS_SSL_MAX_CONTENT_LEN )
+            {
+                MBEDTLS_SSL_DEBUG_MSG( 1, ( "psk identity or DHM size too long"
+                                            " or SSL buffer too short" ) );
+                return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
+            }
+
             ssl->out_msg[i++] = (unsigned char)( n >> 8 );
             ssl->out_msg[i++] = (unsigned char)( n      );
 
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index bc56a48..14ee521 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -693,8 +693,6 @@ int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
     }
     else
     {
-        int ret;
-
         /* Initialize HMAC contexts */
         if( ( ret = mbedtls_md_setup( &transform->md_ctx_enc, md_info, 1 ) ) != 0 ||
             ( ret = mbedtls_md_setup( &transform->md_ctx_dec, md_info, 1 ) ) != 0 )
@@ -1454,7 +1452,7 @@ static int ssl_encrypt_buf( mbedtls_ssl_context *ssl )
             /*
              * Generate IV
              */
-            int ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->transform_out->iv_enc,
+            ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->transform_out->iv_enc,
                                   ssl->transform_out->ivlen );
             if( ret != 0 )
                 return( ret );
@@ -3717,6 +3715,9 @@ int mbedtls_ssl_send_alert_message( mbedtls_ssl_context *ssl,
 {
     int ret;
 
+    if( ssl == NULL || ssl->conf == NULL )
+        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
     MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> send alert message" ) );
 
     ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT;
@@ -5458,6 +5459,13 @@ int mbedtls_ssl_conf_psk( mbedtls_ssl_config *conf,
     if( psk_len > MBEDTLS_PSK_MAX_LEN )
         return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
 
+    /* Identity len will be encoded on two bytes */
+    if( ( psk_identity_len >> 16 ) != 0 ||
+        psk_identity_len > MBEDTLS_SSL_MAX_CONTENT_LEN )
+    {
+        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+    }
+
     if( conf->psk != NULL || conf->psk_identity != NULL )
     {
         mbedtls_free( conf->psk );
@@ -5861,6 +5869,29 @@ int mbedtls_ssl_get_record_expansion( const mbedtls_ssl_context *ssl )
     return( (int)( mbedtls_ssl_hdr_len( ssl ) + transform_expansion ) );
 }
 
+#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
+size_t mbedtls_ssl_get_max_frag_len( const mbedtls_ssl_context *ssl )
+{
+    size_t max_len;
+
+    /*
+     * Assume mfl_code is correct since it was checked when set
+     */
+    max_len = mfl_code_to_length[ssl->conf->mfl_code];
+
+    /*
+     * Check if a smaller max length was negotiated
+     */
+    if( ssl->session_out != NULL &&
+        mfl_code_to_length[ssl->session_out->mfl_code] < max_len )
+    {
+        max_len = mfl_code_to_length[ssl->session_out->mfl_code];
+    }
+
+    return max_len;
+}
+#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
+
 #if defined(MBEDTLS_X509_CRT_PARSE_C)
 const mbedtls_x509_crt *mbedtls_ssl_get_peer_cert( const mbedtls_ssl_context *ssl )
 {
@@ -5893,6 +5924,9 @@ int mbedtls_ssl_handshake_step( mbedtls_ssl_context *ssl )
 {
     int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
 
+    if( ssl == NULL || ssl->conf == NULL )
+        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
 #if defined(MBEDTLS_SSL_CLI_C)
     if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
         ret = mbedtls_ssl_handshake_client_step( ssl );
@@ -5912,6 +5946,9 @@ int mbedtls_ssl_handshake( mbedtls_ssl_context *ssl )
 {
     int ret = 0;
 
+    if( ssl == NULL || ssl->conf == NULL )
+        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
     MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> handshake" ) );
 
     while( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
@@ -6007,6 +6044,9 @@ int mbedtls_ssl_renegotiate( mbedtls_ssl_context *ssl )
 {
     int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
 
+    if( ssl == NULL || ssl->conf == NULL )
+        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
 #if defined(MBEDTLS_SSL_SRV_C)
     /* On server, just send the request */
     if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
@@ -6084,6 +6124,9 @@ int mbedtls_ssl_read( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len )
     int ret, record_read = 0;
     size_t n;
 
+    if( ssl == NULL || ssl->conf == NULL )
+        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
     MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> read" ) );
 
 #if defined(MBEDTLS_SSL_PROTO_DTLS)
@@ -6338,23 +6381,7 @@ static int ssl_write_real( mbedtls_ssl_context *ssl,
 {
     int ret;
 #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
-    unsigned int max_len;
-#endif
-
-#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
-    /*
-     * Assume mfl_code is correct since it was checked when set
-     */
-    max_len = mfl_code_to_length[ssl->conf->mfl_code];
-
-    /*
-     * Check if a smaller max length was negotiated
-     */
-    if( ssl->session_out != NULL &&
-        mfl_code_to_length[ssl->session_out->mfl_code] < max_len )
-    {
-        max_len = mfl_code_to_length[ssl->session_out->mfl_code];
-    }
+    size_t max_len = mbedtls_ssl_get_max_frag_len( ssl );
 
     if( len > max_len )
     {
@@ -6443,6 +6470,9 @@ int mbedtls_ssl_write( mbedtls_ssl_context *ssl, const unsigned char *buf, size_
 
     MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write" ) );
 
+    if( ssl == NULL || ssl->conf == NULL )
+        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
 #if defined(MBEDTLS_SSL_RENEGOTIATION)
     if( ( ret = ssl_check_ctr_renegotiate( ssl ) ) != 0 )
     {
@@ -6478,6 +6508,9 @@ int mbedtls_ssl_close_notify( mbedtls_ssl_context *ssl )
 {
     int ret;
 
+    if( ssl == NULL || ssl->conf == NULL )
+        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
     MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write close notify" ) );
 
     if( ssl->out_left != 0 )
diff --git a/library/x509_crt.c b/library/x509_crt.c
index 827a545..f6879dd 100644
--- a/library/x509_crt.c
+++ b/library/x509_crt.c
@@ -2061,8 +2061,8 @@ static int x509_crt_verify_child(
     *flags |= x509_crt_verifycrl(child, parent, ca_crl, profile );
 #endif
 
-    /* Look for a grandparent upwards the chain */
-    for( grandparent = parent->next;
+    /* Look for a grandparent in trusted CAs */
+    for( grandparent = trust_ca;
          grandparent != NULL;
          grandparent = grandparent->next )
     {
@@ -2071,20 +2071,42 @@ static int x509_crt_verify_child(
             break;
     }
 
-    /* Is our parent part of the chain or at the top? */
     if( grandparent != NULL )
     {
-        ret = x509_crt_verify_child( parent, grandparent, trust_ca, ca_crl, profile,
+        ret = x509_crt_verify_top( parent, grandparent, ca_crl, profile,
                                 path_cnt + 1, &parent_flags, f_vrfy, p_vrfy );
         if( ret != 0 )
             return( ret );
     }
     else
     {
-        ret = x509_crt_verify_top( parent, trust_ca, ca_crl, profile,
-                                path_cnt + 1, &parent_flags, f_vrfy, p_vrfy );
-        if( ret != 0 )
-            return( ret );
+        /* Look for a grandparent upwards the chain */
+        for( grandparent = parent->next;
+             grandparent != NULL;
+             grandparent = grandparent->next )
+        {
+            if( x509_crt_check_parent( parent, grandparent,
+                                       0, path_cnt == 0 ) == 0 )
+                break;
+        }
+
+        /* Is our parent part of the chain or at the top? */
+        if( grandparent != NULL )
+        {
+            ret = x509_crt_verify_child( parent, grandparent, trust_ca, ca_crl,
+                                         profile, path_cnt + 1, &parent_flags,
+                                         f_vrfy, p_vrfy );
+            if( ret != 0 )
+                return( ret );
+        }
+        else
+        {
+            ret = x509_crt_verify_top( parent, trust_ca, ca_crl, profile,
+                                       path_cnt + 1, &parent_flags,
+                                       f_vrfy, p_vrfy );
+            if( ret != 0 )
+                return( ret );
+        }
     }
 
     /* child is verified to be a child of the parent, call verify callback */
@@ -2187,27 +2209,44 @@ int mbedtls_x509_crt_verify_with_profile( mbedtls_x509_crt *crt,
         }
     }
 
-    /* Look for a parent upwards the chain */
-    for( parent = crt->next; parent != NULL; parent = parent->next )
+    /* Look for a parent in trusted CAs */
+    for( parent = trust_ca; parent != NULL; parent = parent->next )
     {
         if( x509_crt_check_parent( crt, parent, 0, pathlen == 0 ) == 0 )
             break;
     }
 
-    /* Are we part of the chain or at the top? */
     if( parent != NULL )
     {
-        ret = x509_crt_verify_child( crt, parent, trust_ca, ca_crl, profile,
-                                     pathlen, flags, f_vrfy, p_vrfy );
+        ret = x509_crt_verify_top( crt, parent, ca_crl, profile,
+                                   pathlen, flags, f_vrfy, p_vrfy );
         if( ret != 0 )
             return( ret );
     }
     else
     {
-        ret = x509_crt_verify_top( crt, trust_ca, ca_crl, profile,
-                                   pathlen, flags, f_vrfy, p_vrfy );
-        if( ret != 0 )
-            return( ret );
+        /* Look for a parent upwards the chain */
+        for( parent = crt->next; parent != NULL; parent = parent->next )
+        {
+            if( x509_crt_check_parent( crt, parent, 0, pathlen == 0 ) == 0 )
+                break;
+        }
+
+        /* Are we part of the chain or at the top? */
+        if( parent != NULL )
+        {
+            ret = x509_crt_verify_child( crt, parent, trust_ca, ca_crl, profile,
+                                         pathlen, flags, f_vrfy, p_vrfy );
+            if( ret != 0 )
+                return( ret );
+        }
+        else
+        {
+            ret = x509_crt_verify_top( crt, trust_ca, ca_crl, profile,
+                                       pathlen, flags, f_vrfy, p_vrfy );
+            if( ret != 0 )
+                return( ret );
+        }
     }
 
     if( *flags != 0 )
diff --git a/programs/pkey/dh_client.c b/programs/pkey/dh_client.c
index c4cc388..59c4fa8 100644
--- a/programs/pkey/dh_client.c
+++ b/programs/pkey/dh_client.c
@@ -74,7 +74,7 @@ int main( void )
 
     unsigned char *p, *end;
     unsigned char buf[2048];
-    unsigned char hash[20];
+    unsigned char hash[32];
     const char *pers = "dh_client";
 
     mbedtls_entropy_context entropy;
diff --git a/programs/pkey/dh_server.c b/programs/pkey/dh_server.c
index 533105a..83b0b44 100644
--- a/programs/pkey/dh_server.c
+++ b/programs/pkey/dh_server.c
@@ -73,7 +73,7 @@ int main( void )
     mbedtls_net_context listen_fd, client_fd;
 
     unsigned char buf[2048];
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf2[2];
     const char *pers = "dh_server";
 
diff --git a/programs/pkey/pk_decrypt.c b/programs/pkey/pk_decrypt.c
index 70c3125..32fbc75 100644
--- a/programs/pkey/pk_decrypt.c
+++ b/programs/pkey/pk_decrypt.c
@@ -150,8 +150,11 @@ exit:
     mbedtls_entropy_free( &entropy );
 
 #if defined(MBEDTLS_ERROR_C)
-    mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
-    mbedtls_printf( "  !  Last error was: %s\n", buf );
+    if( ret != 0 )
+    {
+        mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
+        mbedtls_printf( "  !  Last error was: %s\n", buf );
+    }
 #endif
 
 #if defined(_WIN32)
diff --git a/programs/pkey/pk_encrypt.c b/programs/pkey/pk_encrypt.c
index 8061a25..7ca9d5a 100644
--- a/programs/pkey/pk_encrypt.c
+++ b/programs/pkey/pk_encrypt.c
@@ -150,8 +150,11 @@ exit:
     mbedtls_entropy_free( &entropy );
 
 #if defined(MBEDTLS_ERROR_C)
-    mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
-    mbedtls_printf( "  !  Last error was: %s\n", buf );
+    if( ret != 0 )
+    {
+        mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
+        mbedtls_printf( "  !  Last error was: %s\n", buf );
+    }
 #endif
 
 #if defined(_WIN32)
diff --git a/programs/pkey/pk_sign.c b/programs/pkey/pk_sign.c
index c61abbb..606fc93 100644
--- a/programs/pkey/pk_sign.c
+++ b/programs/pkey/pk_sign.c
@@ -63,7 +63,7 @@ int main( int argc, char *argv[] )
     mbedtls_pk_context pk;
     mbedtls_entropy_context entropy;
     mbedtls_ctr_drbg_context ctr_drbg;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
     char filename[512];
     const char *pers = "mbedtls_pk_sign";
@@ -128,7 +128,7 @@ int main( int argc, char *argv[] )
     }
 
     /*
-     * Write the signature into <filename>-sig.txt
+     * Write the signature into <filename>.sig
      */
     mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[2] );
 
@@ -155,8 +155,11 @@ exit:
     mbedtls_entropy_free( &entropy );
 
 #if defined(MBEDTLS_ERROR_C)
-    mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
-    mbedtls_printf( "  !  Last error was: %s\n", buf );
+    if( ret != 0 )
+    {
+        mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
+        mbedtls_printf( "  !  Last error was: %s\n", buf );
+    }
 #endif
 
 #if defined(_WIN32)
diff --git a/programs/pkey/pk_verify.c b/programs/pkey/pk_verify.c
index 6fab609..d35d17f 100644
--- a/programs/pkey/pk_verify.c
+++ b/programs/pkey/pk_verify.c
@@ -58,7 +58,7 @@ int main( int argc, char *argv[] )
     int ret = 1;
     size_t i;
     mbedtls_pk_context pk;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
     char filename[512];
 
@@ -85,7 +85,7 @@ int main( int argc, char *argv[] )
     }
 
     /*
-     * Extract the signature from the text file
+     * Extract the signature from the file
      */
     ret = 1;
     mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[2] );
@@ -102,8 +102,8 @@ int main( int argc, char *argv[] )
     fclose( f );
 
     /*
-     * Compute the SHA-256 hash of the input file and compare
-     * it with the hash decrypted from the signature.
+     * Compute the SHA-256 hash of the input file and
+     * verify the signature
      */
     mbedtls_printf( "\n  . Verifying the SHA-256 signature" );
     fflush( stdout );
@@ -123,7 +123,7 @@ int main( int argc, char *argv[] )
         goto exit;
     }
 
-    mbedtls_printf( "\n  . OK (the decrypted SHA-256 hash matches)\n\n" );
+    mbedtls_printf( "\n  . OK (the signature is valid)\n\n" );
 
     ret = 0;
 
@@ -131,8 +131,11 @@ exit:
     mbedtls_pk_free( &pk );
 
 #if defined(MBEDTLS_ERROR_C)
-    mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
-    mbedtls_printf( "  !  Last error was: %s\n", buf );
+    if( ret != 0 )
+    {
+        mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
+        mbedtls_printf( "  !  Last error was: %s\n", buf );
+    }
 #endif
 
 #if defined(_WIN32)
diff --git a/programs/pkey/rsa_genkey.c b/programs/pkey/rsa_genkey.c
index 358202b..e199ad2 100644
--- a/programs/pkey/rsa_genkey.c
+++ b/programs/pkey/rsa_genkey.c
@@ -45,7 +45,7 @@
 #include <string.h>
 #endif
 
-#define KEY_SIZE 1024
+#define KEY_SIZE 2048
 #define EXPONENT 65537
 
 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) ||   \
diff --git a/programs/pkey/rsa_sign.c b/programs/pkey/rsa_sign.c
index 9acd198..469ad9f 100644
--- a/programs/pkey/rsa_sign.c
+++ b/programs/pkey/rsa_sign.c
@@ -31,6 +31,7 @@
 #include <stdio.h>
 #define mbedtls_fprintf    fprintf
 #define mbedtls_printf     printf
+#define mbedtls_snprintf   snprintf
 #endif
 
 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) ||  \
@@ -57,8 +58,9 @@ int main( int argc, char *argv[] )
     int ret;
     size_t i;
     mbedtls_rsa_context rsa;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
+    char filename[512];
 
     ret = 1;
 
@@ -134,11 +136,11 @@ int main( int argc, char *argv[] )
     }
 
     /*
-     * Write the signature into <filename>-sig.txt
+     * Write the signature into <filename>.sig
      */
-    memcpy( argv[1] + strlen( argv[1] ), ".sig", 5 );
+    mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[1] );
 
-    if( ( f = fopen( argv[1], "wb+" ) ) == NULL )
+    if( ( f = fopen( filename, "wb+" ) ) == NULL )
     {
         ret = 1;
         mbedtls_printf( " failed\n  ! Could not create %s\n\n", argv[1] );
@@ -151,7 +153,7 @@ int main( int argc, char *argv[] )
 
     fclose( f );
 
-    mbedtls_printf( "\n  . Done (created \"%s\")\n\n", argv[1] );
+    mbedtls_printf( "\n  . Done (created \"%s\")\n\n", filename );
 
 exit:
 
diff --git a/programs/pkey/rsa_sign_pss.c b/programs/pkey/rsa_sign_pss.c
index d9790d3..c045a04 100644
--- a/programs/pkey/rsa_sign_pss.c
+++ b/programs/pkey/rsa_sign_pss.c
@@ -64,7 +64,7 @@ int main( int argc, char *argv[] )
     mbedtls_pk_context pk;
     mbedtls_entropy_context entropy;
     mbedtls_ctr_drbg_context ctr_drbg;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
     char filename[512];
     const char *pers = "rsa_sign_pss";
@@ -139,7 +139,7 @@ int main( int argc, char *argv[] )
     }
 
     /*
-     * Write the signature into <filename>-sig.txt
+     * Write the signature into <filename>.sig
      */
     mbedtls_snprintf( filename, 512, "%s.sig", argv[2] );
 
diff --git a/programs/pkey/rsa_verify.c b/programs/pkey/rsa_verify.c
index c531ae5..9d48a18 100644
--- a/programs/pkey/rsa_verify.c
+++ b/programs/pkey/rsa_verify.c
@@ -30,6 +30,7 @@
 #else
 #include <stdio.h>
 #define mbedtls_printf     printf
+#define mbedtls_snprintf   snprintf
 #endif
 
 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) ||  \
@@ -56,8 +57,9 @@ int main( int argc, char *argv[] )
     int ret, c;
     size_t i;
     mbedtls_rsa_context rsa;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
+    char filename[512];
 
     ret = 1;
     if( argc != 2 )
@@ -98,17 +100,15 @@ int main( int argc, char *argv[] )
      * Extract the RSA signature from the text file
      */
     ret = 1;
-    i = strlen( argv[1] );
-    memcpy( argv[1] + i, ".sig", 5 );
+    mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[1] );
 
-    if( ( f = fopen( argv[1], "rb" ) ) == NULL )
+    if( ( f = fopen( filename, "rb" ) ) == NULL )
     {
-        mbedtls_printf( "\n  ! Could not open %s\n\n", argv[1] );
+        mbedtls_printf( "\n  ! Could not open %s\n\n", filename );
         goto exit;
     }
 
-    argv[1][i] = '\0', i = 0;
-
+    i = 0;
     while( fscanf( f, "%02X", &c ) > 0 &&
            i < (int) sizeof( buf ) )
         buf[i++] = (unsigned char) c;
@@ -122,8 +122,8 @@ int main( int argc, char *argv[] )
     }
 
     /*
-     * Compute the SHA-256 hash of the input file and compare
-     * it with the hash decrypted from the RSA signature.
+     * Compute the SHA-256 hash of the input file and
+     * verify the signature
      */
     mbedtls_printf( "\n  . Verifying the RSA/SHA-256 signature" );
     fflush( stdout );
@@ -143,7 +143,7 @@ int main( int argc, char *argv[] )
         goto exit;
     }
 
-    mbedtls_printf( "\n  . OK (the decrypted SHA-256 hash matches)\n\n" );
+    mbedtls_printf( "\n  . OK (the signature is valid)\n\n" );
 
     ret = 0;
 
diff --git a/programs/pkey/rsa_verify_pss.c b/programs/pkey/rsa_verify_pss.c
index e8c1d22..31b720f 100644
--- a/programs/pkey/rsa_verify_pss.c
+++ b/programs/pkey/rsa_verify_pss.c
@@ -62,7 +62,7 @@ int main( int argc, char *argv[] )
     int ret = 1;
     size_t i;
     mbedtls_pk_context pk;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
     char filename[512];
 
@@ -99,7 +99,7 @@ int main( int argc, char *argv[] )
     mbedtls_rsa_set_padding( mbedtls_pk_rsa( pk ), MBEDTLS_RSA_PKCS_V21, MBEDTLS_MD_SHA256 );
 
     /*
-     * Extract the RSA signature from the text file
+     * Extract the RSA signature from the file
      */
     ret = 1;
     mbedtls_snprintf( filename, 512, "%s.sig", argv[2] );
@@ -116,8 +116,8 @@ int main( int argc, char *argv[] )
     fclose( f );
 
     /*
-     * Compute the SHA-256 hash of the input file and compare
-     * it with the hash decrypted from the RSA signature.
+     * Compute the SHA-256 hash of the input file and
+     * verify the signature
      */
     mbedtls_printf( "\n  . Verifying the RSA/SHA-256 signature" );
     fflush( stdout );
@@ -137,7 +137,7 @@ int main( int argc, char *argv[] )
         goto exit;
     }
 
-    mbedtls_printf( "\n  . OK (the decrypted SHA-256 hash matches)\n\n" );
+    mbedtls_printf( "\n  . OK (the signature is valid)\n\n" );
 
     ret = 0;
 
diff --git a/programs/ssl/ssl_client2.c b/programs/ssl/ssl_client2.c
index 962148e..99c2d2a 100644
--- a/programs/ssl/ssl_client2.c
+++ b/programs/ssl/ssl_client2.c
@@ -1239,6 +1239,11 @@ int main( int argc, char *argv[] )
     else
         mbedtls_printf( "    [ Record expansion is unknown (compression) ]\n" );
 
+#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
+    mbedtls_printf( "    [ Maximum fragment length is %u ]\n",
+                    (unsigned int) mbedtls_ssl_get_max_frag_len( &ssl ) );
+#endif
+
 #if defined(MBEDTLS_SSL_ALPN)
     if( opt.alpn_string != NULL )
     {
diff --git a/programs/ssl/ssl_server2.c b/programs/ssl/ssl_server2.c
index d7ce17f..f169291 100644
--- a/programs/ssl/ssl_server2.c
+++ b/programs/ssl/ssl_server2.c
@@ -1924,7 +1924,7 @@ reset:
         if( ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED )
         {
             char vrfy_buf[512];
-            uint32_t flags = mbedtls_ssl_get_verify_result( &ssl );
+            flags = mbedtls_ssl_get_verify_result( &ssl );
 
             mbedtls_x509_crt_verify_info( vrfy_buf, sizeof( vrfy_buf ), "  ! ", flags );
 
@@ -1945,6 +1945,11 @@ reset:
     else
         mbedtls_printf( "    [ Record expansion is unknown (compression) ]\n" );
 
+#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
+    mbedtls_printf( "    [ Maximum fragment length is %u ]\n",
+                    (unsigned int) mbedtls_ssl_get_max_frag_len( &ssl ) );
+#endif
+
 #if defined(MBEDTLS_SSL_ALPN)
     if( opt.alpn_string != NULL )
     {
diff --git a/programs/test/benchmark.c b/programs/test/benchmark.c
index 2c6ecde..8ab32f6 100644
--- a/programs/test/benchmark.c
+++ b/programs/test/benchmark.c
@@ -107,31 +107,31 @@ int main( void )
 
 #define TIME_AND_TSC( TITLE, CODE )                                     \
 do {                                                                    \
-    unsigned long i, j, tsc;                                            \
+    unsigned long ii, jj, tsc;                                          \
                                                                         \
-    mbedtls_printf( HEADER_FORMAT, TITLE );                            \
+    mbedtls_printf( HEADER_FORMAT, TITLE );                             \
     fflush( stdout );                                                   \
                                                                         \
-    mbedtls_set_alarm( 1 );                                                     \
-    for( i = 1; ! mbedtls_timing_alarmed; i++ )                                        \
+    mbedtls_set_alarm( 1 );                                             \
+    for( ii = 1; ! mbedtls_timing_alarmed; ii++ )                       \
     {                                                                   \
         CODE;                                                           \
     }                                                                   \
                                                                         \
-    tsc = mbedtls_timing_hardclock();                                                  \
-    for( j = 0; j < 1024; j++ )                                         \
+    tsc = mbedtls_timing_hardclock();                                   \
+    for( jj = 0; jj < 1024; jj++ )                                      \
     {                                                                   \
         CODE;                                                           \
     }                                                                   \
                                                                         \
-    mbedtls_printf( "%9lu Kb/s,  %9lu cycles/byte\n",                  \
-                     i * BUFSIZE / 1024,                                \
-                     ( mbedtls_timing_hardclock() - tsc ) / ( j * BUFSIZE ) );         \
+    mbedtls_printf( "%9lu Kb/s,  %9lu cycles/byte\n",                   \
+                     ii * BUFSIZE / 1024,                               \
+                     ( mbedtls_timing_hardclock() - tsc ) / ( jj * BUFSIZE ) );         \
 } while( 0 )
 
 #if defined(MBEDTLS_ERROR_C)
 #define PRINT_ERROR                                                     \
-        mbedtls_strerror( ret, ( char * )tmp, sizeof( tmp ) );         \
+        mbedtls_strerror( ret, ( char * )tmp, sizeof( tmp ) );          \
         mbedtls_printf( "FAILED: %s\n", tmp );
 #else
 #define PRINT_ERROR                                                     \
@@ -143,12 +143,12 @@ do {                                                                    \
 #define MEMORY_MEASURE_INIT                                             \
     size_t max_used, max_blocks, max_bytes;                             \
     size_t prv_used, prv_blocks;                                        \
-    mbedtls_memory_buffer_alloc_cur_get( &prv_used, &prv_blocks );              \
+    mbedtls_memory_buffer_alloc_cur_get( &prv_used, &prv_blocks );      \
     mbedtls_memory_buffer_alloc_max_reset( );
 
 #define MEMORY_MEASURE_PRINT( title_len )                               \
-    mbedtls_memory_buffer_alloc_max_get( &max_used, &max_blocks );              \
-    for( i = 12 - title_len; i != 0; i-- ) mbedtls_printf( " " );      \
+    mbedtls_memory_buffer_alloc_max_get( &max_used, &max_blocks );      \
+    for( ii = 12 - title_len; ii != 0; ii-- ) mbedtls_printf( " " );    \
     max_used -= prv_used;                                               \
     max_blocks -= prv_blocks;                                           \
     max_bytes = max_used + MEM_BLOCK_OVERHEAD * max_blocks;             \
@@ -161,16 +161,16 @@ do {                                                                    \
 
 #define TIME_PUBLIC( TITLE, TYPE, CODE )                                \
 do {                                                                    \
-    unsigned long i;                                                    \
+    unsigned long ii;                                                   \
     int ret;                                                            \
     MEMORY_MEASURE_INIT;                                                \
                                                                         \
-    mbedtls_printf( HEADER_FORMAT, TITLE );                            \
+    mbedtls_printf( HEADER_FORMAT, TITLE );                             \
     fflush( stdout );                                                   \
-    mbedtls_set_alarm( 3 );                                                     \
+    mbedtls_set_alarm( 3 );                                             \
                                                                         \
     ret = 0;                                                            \
-    for( i = 1; ! mbedtls_timing_alarmed && ! ret ; i++ )                              \
+    for( ii = 1; ! mbedtls_timing_alarmed && ! ret ; ii++ )             \
     {                                                                   \
         CODE;                                                           \
     }                                                                   \
@@ -181,9 +181,9 @@ do {                                                                    \
     }                                                                   \
     else                                                                \
     {                                                                   \
-        mbedtls_printf( "%6lu " TYPE "/s", i / 3 );                    \
+        mbedtls_printf( "%6lu " TYPE "/s", ii / 3 );                    \
         MEMORY_MEASURE_PRINT( sizeof( TYPE ) + 1 );                     \
-        mbedtls_printf( "\n" );                                        \
+        mbedtls_printf( "\n" );                                         \
     }                                                                   \
 } while( 0 )
 
diff --git a/programs/test/udp_proxy.c b/programs/test/udp_proxy.c
index 3d43da6..eb8d29e 100644
--- a/programs/test/udp_proxy.c
+++ b/programs/test/udp_proxy.c
@@ -388,7 +388,7 @@ void update_dropped( const packet *p )
 
     while( cur < end )
     {
-        size_t len = ( ( cur[11] << 8 ) | cur[12] ) + 13;
+        len = ( ( cur[11] << 8 ) | cur[12] ) + 13;
 
         id = len % sizeof( dropped );
         ++dropped[id];
diff --git a/tests/data_files/Readme-x509.txt b/tests/data_files/Readme-x509.txt
index 2cf0c66..680d612 100644
--- a/tests/data_files/Readme-x509.txt
+++ b/tests/data_files/Readme-x509.txt
@@ -17,6 +17,9 @@ Two intermediate CAs are signed by them:
 - test-int-ca2.crt "C=NL, O=PolarSSL, CN=PolarSSL Test Intermediate EC CA"
   uses an EC key with NIST P-256, signed by test-ca
 
+A third intermediate CA is signed by test-int-ca2.crt:
+- test-int-ca3.crt "C=UK, O=mbed TLS, CN=mbed TLS Test intermediate CA 3"
+
 Finally, other CAs for specific purposes:
 - enco-ca-prstr.pem: has its CN encoded as a printable string, but child cert
   enco-cert-utf8str.pem has its issuer's CN encoded as a UTF-8 string.
@@ -35,11 +38,12 @@ Short information fields:
                 2   -> test-ca2.crt
                 I1  -> test-int-ca.crt
                 I2  -> test-int-ca2.crt
+                I3  -> test-int-ca3.crt
                 O   -> other
 - key type: R -> RSA, E -> EC
 - C -> there is a CRL revoking this cert (see below)
 - L -> CN=localhost (useful for local test servers)
-- P1, P2 if the file include parent (resp. parent + grandparent)
+- P1, P2 if the file includes parent (resp. parent + grandparent)
 - free-form comments
 
 List of certificates:
@@ -50,8 +54,9 @@ List of certificates:
 - cert_v1_with_ext.crt: 1 R: v1 with extensions (illegal)
 - cli2.crt: 2 E: basic
 - enco-cert-utf8str.pem: see enco-ca-prstr.pem above
-- server1*.crt: 1* R C*: misc *(server1-v1 see test-ca-v1.crt above)
+- server1*.crt: 1* R C* P1*: misc *(server1-v1 see test-ca-v1.crt above)
     *CRL for: .cert_type.crt, .crt, .key_usage.crt, .v1.crt
+    P1 only for _ca.crt
 - server2-v1*.crt: O R: see test-ca-v1.crt above
 - server2*.crt: 1 R L: misc
 - server3.crt: 1 E L: EC cert signed by RSA CA
@@ -62,11 +67,13 @@ List of certificates:
     -ku*: keyUsage (ds = signatures, ke/ka = key exchange/agreement)
 - server6-ss-child.crt: O E: "child" of non-CA server5-selfsigned
 - server6.crt, server6.pem: 2 E L C: revoked
-- server7*.crt: I1 E L P1*: EC signed by RSA signed by EC *(except 7.crt)
+- server7*.crt: I1 E L P1*: EC signed by RSA signed by EC
+    *P1 except 7.crt, P2 _int-ca_ca2.crt
     *_space: with PEM error(s)
 - server8*.crt: I2 R L: RSA signed by EC signed by RSA (P1 for _int-ca2)
 - server9*.crt: 1 R C* L P1*: signed using RSASSA-PSS
     *CRL for: 9.crt, -badsign, -with-ca (P1)
+- server10*.crt: I3 E L P2/P3
 
 Certificate revocation lists
 ----------------------------
diff --git a/tests/data_files/server10.key b/tests/data_files/server10.key
new file mode 100644
index 0000000..0088331
--- /dev/null
+++ b/tests/data_files/server10.key
@@ -0,0 +1,5 @@
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEILBDMs7bRVxVg6ovTpf2zB9m+22jY7R3LNKRvCPfa6YJoAoGCCqGSM49
+AwEHoUQDQgAEHG336dql6qGcsnIZqAkcc63eFbvepuOzTwXobRAuOmk3l4A5wXX/
+vs5wAawLX1wUTUM/AESHmAZrJK9tq5So8g==
+-----END EC PRIVATE KEY-----
diff --git a/tests/data_files/server10_int3_int-ca2.crt b/tests/data_files/server10_int3_int-ca2.crt
new file mode 100644
index 0000000..dfe889a
--- /dev/null
+++ b/tests/data_files/server10_int3_int-ca2.crt
@@ -0,0 +1,80 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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diff --git a/tests/data_files/server10_int3_int-ca2_ca.crt b/tests/data_files/server10_int3_int-ca2_ca.crt
new file mode 100644
index 0000000..e85cc4a
--- /dev/null
+++ b/tests/data_files/server10_int3_int-ca2_ca.crt
@@ -0,0 +1,160 @@
+-----BEGIN CERTIFICATE-----
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+-----BEGIN CERTIFICATE-----
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+-----BEGIN CERTIFICATE-----
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+-----BEGIN CERTIFICATE-----
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+-----BEGIN CERTIFICATE-----
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+-----BEGIN CERTIFICATE-----
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+Certificate:
+    Data:
+        Version: 3 (0x2)
+        Serial Number: 0 (0x0)
+        Signature Algorithm: sha1WithRSAEncryption
+        Issuer: C=NL, O=PolarSSL, CN=PolarSSL Test CA
+        Validity
+            Not Before: Feb 12 14:44:00 2011 GMT
+            Not After : Feb 12 14:44:00 2021 GMT
+        Subject: C=NL, O=PolarSSL, CN=PolarSSL Test CA
+        Subject Public Key Info:
+            Public Key Algorithm: rsaEncryption
+            RSA Public Key: (2048 bit)
+                Modulus (2048 bit):
+                    00:c0:df:37:fc:17:bb:e0:96:9d:3f:86:de:96:32:
+                    7d:44:a5:16:a0:cd:21:f1:99:d4:ec:ea:cb:7c:18:
+                    58:08:94:a5:ec:9b:c5:8b:df:1a:1e:99:38:99:87:
+                    1e:7b:c0:8d:39:df:38:5d:70:78:07:d3:9e:d9:93:
+                    e8:b9:72:51:c5:ce:a3:30:52:a9:f2:e7:40:70:14:
+                    cb:44:a2:72:0b:c2:e5:40:f9:3e:e5:a6:0e:b3:f9:
+                    ec:4a:63:c0:b8:29:00:74:9c:57:3b:a8:a5:04:90:
+                    71:f1:bd:83:d9:3f:d6:a5:e2:3c:2a:8f:ef:27:60:
+                    c3:c6:9f:cb:ba:ec:60:7d:b7:e6:84:32:be:4f:fb:
+                    58:26:22:03:5b:d4:b4:d5:fb:f5:e3:96:2e:70:c0:
+                    e4:2e:bd:fc:2e:ee:e2:41:55:c0:34:2e:7d:24:72:
+                    69:cb:47:b1:14:40:83:7d:67:f4:86:f6:31:ab:f1:
+                    79:a4:b2:b5:2e:12:f9:84:17:f0:62:6f:27:3e:13:
+                    58:b1:54:0d:21:9a:73:37:a1:30:cf:6f:92:dc:f6:
+                    e9:fc:ac:db:2e:28:d1:7e:02:4b:23:a0:15:f2:38:
+                    65:64:09:ea:0c:6e:8e:1b:17:a0:71:c8:b3:9b:c9:
+                    ab:e9:c3:f2:cf:87:96:8f:80:02:32:9e:99:58:6f:
+                    a2:d5
+                Exponent: 65537 (0x10001)
+        X509v3 extensions:
+            X509v3 Basic Constraints: 
+                CA:TRUE
+            X509v3 Subject Key Identifier: 
+                B4:5A:E4:A5:B3:DE:D2:52:F6:B9:D5:A6:95:0F:EB:3E:BC:C7:FD:FF
+            X509v3 Authority Key Identifier: 
+                keyid:B4:5A:E4:A5:B3:DE:D2:52:F6:B9:D5:A6:95:0F:EB:3E:BC:C7:FD:FF
+                DirName:/C=NL/O=PolarSSL/CN=PolarSSL Test CA
+                serial:00
+
+    Signature Algorithm: sha1WithRSAEncryption
+        b8:fd:54:d8:00:54:90:8b:25:b0:27:dd:95:cd:a2:f7:84:07:
+        1d:87:89:4a:c4:78:11:d8:07:b5:d7:22:50:8e:48:eb:62:7a:
+        32:89:be:63:47:53:ff:b6:be:f1:2e:8c:54:c0:99:3f:a0:b9:
+        37:23:72:5f:0d:46:59:8f:d8:47:cd:97:4c:9f:07:0c:12:62:
+        09:3a:24:e4:36:d9:e9:2c:da:38:d0:73:75:61:d7:c1:6c:26:
+        8b:9b:e0:d5:dc:67:ed:8c:6b:33:d7:74:22:3c:4c:db:b5:8d:
+        2a:ce:2c:0d:08:59:05:09:05:a6:39:9f:b3:67:1b:e2:83:e5:
+        e1:8f:53:f6:67:93:c7:f9:6f:76:44:58:12:e8:3a:d4:97:e7:
+        e9:c0:3e:a8:7a:72:3d:87:53:1f:e5:2c:84:84:e7:9a:9e:7f:
+        66:d9:1f:9b:f5:13:48:b0:4d:14:d1:de:b2:24:d9:78:7d:f5:
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+        e9:5d:2a:0a:0d:5d:55:ec:21:50:17:16:e6:06:4a:cd:5e:de:
+        f7:e0:e9:54
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
diff --git a/tests/data_files/server1_ca.crt b/tests/data_files/server1_ca.crt
new file mode 100644
index 0000000..748d944
--- /dev/null
+++ b/tests/data_files/server1_ca.crt
@@ -0,0 +1,41 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
diff --git a/tests/data_files/server7_int-ca_ca2.crt b/tests/data_files/server7_int-ca_ca2.crt
new file mode 100644
index 0000000..c289c0a
--- /dev/null
+++ b/tests/data_files/server7_int-ca_ca2.crt
@@ -0,0 +1,62 @@
+-----BEGIN CERTIFICATE-----
+MIIDwjCCAaqgAwIBAgIBEDANBgkqhkiG9w0BAQsFADBIMQswCQYDVQQGEwJOTDER
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
diff --git a/tests/data_files/test-int-ca3.crt b/tests/data_files/test-int-ca3.crt
new file mode 100644
index 0000000..7e724b2
--- /dev/null
+++ b/tests/data_files/test-int-ca3.crt
@@ -0,0 +1,12 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
diff --git a/tests/data_files/test-int-ca3.key b/tests/data_files/test-int-ca3.key
new file mode 100644
index 0000000..1bcc711
--- /dev/null
+++ b/tests/data_files/test-int-ca3.key
@@ -0,0 +1,8 @@
+-----BEGIN EC PARAMETERS-----
+BggqhkjOPQMBBw==
+-----END EC PARAMETERS-----
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEIC9zTt8jgjBlbq+qCsGj6uclaKLYBqxYSmUiuBdM1KG9oAoGCCqGSM49
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+hP7X/5js/DX92J/utoHyjUtVpQOzdTrbsQ==
+-----END EC PRIVATE KEY-----
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index bd36e22..77db588 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -1085,6 +1085,8 @@ run_test    "Max fragment length: not used, reference" \
             "$P_SRV debug_level=3" \
             "$P_CLI debug_level=3" \
             0 \
+            -c "Maximum fragment length is 16384" \
+            -s "Maximum fragment length is 16384" \
             -C "client hello, adding max_fragment_length extension" \
             -S "found max fragment length extension" \
             -S "server hello, max_fragment_length extension" \
@@ -1094,6 +1096,8 @@ run_test    "Max fragment length: used by client" \
             "$P_SRV debug_level=3" \
             "$P_CLI debug_level=3 max_frag_len=4096" \
             0 \
+            -c "Maximum fragment length is 4096" \
+            -s "Maximum fragment length is 4096" \
             -c "client hello, adding max_fragment_length extension" \
             -s "found max fragment length extension" \
             -s "server hello, max_fragment_length extension" \
@@ -1103,6 +1107,8 @@ run_test    "Max fragment length: used by server" \
             "$P_SRV debug_level=3 max_frag_len=4096" \
             "$P_CLI debug_level=3" \
             0 \
+            -c "Maximum fragment length is 16384" \
+            -s "Maximum fragment length is 4096" \
             -C "client hello, adding max_fragment_length extension" \
             -S "found max fragment length extension" \
             -S "server hello, max_fragment_length extension" \
@@ -1113,6 +1119,7 @@ run_test    "Max fragment length: gnutls server" \
             "$G_SRV" \
             "$P_CLI debug_level=3 max_frag_len=4096" \
             0 \
+            -c "Maximum fragment length is 4096" \
             -c "client hello, adding max_fragment_length extension" \
             -c "found max_fragment_length extension"
 
@@ -1120,6 +1127,8 @@ run_test    "Max fragment length: client, message just fits" \
             "$P_SRV debug_level=3" \
             "$P_CLI debug_level=3 max_frag_len=2048 request_size=2048" \
             0 \
+            -c "Maximum fragment length is 2048" \
+            -s "Maximum fragment length is 2048" \
             -c "client hello, adding max_fragment_length extension" \
             -s "found max fragment length extension" \
             -s "server hello, max_fragment_length extension" \
@@ -1131,6 +1140,8 @@ run_test    "Max fragment length: client, larger message" \
             "$P_SRV debug_level=3" \
             "$P_CLI debug_level=3 max_frag_len=2048 request_size=2345" \
             0 \
+            -c "Maximum fragment length is 2048" \
+            -s "Maximum fragment length is 2048" \
             -c "client hello, adding max_fragment_length extension" \
             -s "found max fragment length extension" \
             -s "server hello, max_fragment_length extension" \
@@ -1143,6 +1154,8 @@ run_test    "Max fragment length: DTLS client, larger message" \
             "$P_SRV debug_level=3 dtls=1" \
             "$P_CLI debug_level=3 dtls=1 max_frag_len=2048 request_size=2345" \
             1 \
+            -c "Maximum fragment length is 2048" \
+            -s "Maximum fragment length is 2048" \
             -c "client hello, adding max_fragment_length extension" \
             -s "found max fragment length extension" \
             -s "server hello, max_fragment_length extension" \
diff --git a/tests/suites/test_suite_debug.function b/tests/suites/test_suite_debug.function
index 3c77ca5..98f98b0 100644
--- a/tests/suites/test_suite_debug.function
+++ b/tests/suites/test_suite_debug.function
@@ -25,6 +25,11 @@ void string_debug(void *data, int level, const char *file, int line, const char
     *p++ = ':';
     *p++ = ' ';
 
+#if defined(MBEDTLS_THREADING_C)
+    /* Skip "thread ID" (up to the first space) as it is not predictable */
+    while( *str++ != ' ' );
+#endif
+
     memcpy( p, str, strlen( str ) );
     p += strlen( str );
 
diff --git a/tests/suites/test_suite_x509parse.data b/tests/suites/test_suite_x509parse.data
index 5bd2af4..e25258f 100644
--- a/tests/suites/test_suite_x509parse.data
+++ b/tests/suites/test_suite_x509parse.data
@@ -699,6 +699,54 @@ X509 Certificate verification #81 (multiple CRLs, none relevant)
 depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECDSA_C:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_SHA256_C:MBEDTLS_RSA_C
 x509_verify:"data_files/enco-cert-utf8str.pem":"data_files/enco-ca-prstr.pem":"data_files/crl_cat_rsa-ec.pem":"NULL":MBEDTLS_ERR_X509_CERT_VERIFY_FAILED:MBEDTLS_X509_BADCERT_BAD_KEY:"NULL"
 
+X509 Certificate verification callback: trusted EE cert
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECDSA_C:MBEDTLS_SHA256_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED
+x509_verify_callback:"data_files/server5-selfsigned.crt":"data_files/server5-selfsigned.crt":0:"depth 0 - serial 53\:A2\:CB\:4B\:12\:4E\:AD\:83\:7D\:A8\:94\:B2 - subject CN=selfsigned, OU=testing, O=PolarSSL, C=NL\n"
+
+X509 Certificate verification callback: simple
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_SHA1_C:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15
+x509_verify_callback:"data_files/server1.crt":"data_files/test-ca.crt":0:"depth 1 - serial 00 - subject C=NL, O=PolarSSL, CN=PolarSSL Test CA\ndepth 0 - serial 01 - subject C=NL, O=PolarSSL, CN=PolarSSL Server 1\n"
+
+X509 Certificate verification callback: two trusted roots
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_SHA1_C:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_ECDSA_C:MBEDTLS_ECP_DP_SECP384R1_ENABLED
+x509_verify_callback:"data_files/server1.crt":"data_files/test-ca_cat12.crt":0:"depth 1 - serial 00 - subject C=NL, O=PolarSSL, CN=PolarSSL Test CA\ndepth 0 - serial 01 - subject C=NL, O=PolarSSL, CN=PolarSSL Server 1\n"
+
+X509 Certificate verification callback: two trusted roots, reversed order
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_SHA1_C:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_ECDSA_C:MBEDTLS_ECP_DP_SECP384R1_ENABLED
+x509_verify_callback:"data_files/server1.crt":"data_files/test-ca_cat21.crt":0:"depth 1 - serial 00 - subject C=NL, O=PolarSSL, CN=PolarSSL Test CA\ndepth 0 - serial 01 - subject C=NL, O=PolarSSL, CN=PolarSSL Server 1\n"
+
+X509 Certificate verification callback: root included
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_SHA1_C:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_ECDSA_C:MBEDTLS_ECP_DP_SECP384R1_ENABLED
+x509_verify_callback:"data_files/server1_ca.crt":"data_files/test-ca_cat21.crt":0:"depth 1 - serial 00 - subject C=NL, O=PolarSSL, CN=PolarSSL Test CA\ndepth 0 - serial 01 - subject C=NL, O=PolarSSL, CN=PolarSSL Server 1\n"
+
+X509 Certificate verification callback: intermediate ca
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECDSA_C:MBEDTLS_RSA_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_PKCS1_V15:MBEDTLS_SHA256_C
+x509_verify_callback:"data_files/server7_int-ca.crt":"data_files/test-ca_cat12.crt":0:"depth 2 - serial C1\:43\:E2\:7E\:62\:43\:CC\:E8 - subject C=NL, O=PolarSSL, CN=Polarssl Test EC CA\ndepth 1 - serial 0E - subject C=NL, O=PolarSSL, CN=PolarSSL Test Intermediate CA\ndepth 0 - serial 10 - subject C=NL, O=PolarSSL, CN=localhost\n"
+
+X509 Certificate verification callback: intermediate ca, root included
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECDSA_C:MBEDTLS_RSA_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_PKCS1_V15:MBEDTLS_SHA256_C
+x509_verify_callback:"data_files/server7_int-ca_ca2.crt":"data_files/test-ca_cat12.crt":0:"depth 2 - serial C1\:43\:E2\:7E\:62\:43\:CC\:E8 - subject C=NL, O=PolarSSL, CN=Polarssl Test EC CA\ndepth 1 - serial 0E - subject C=NL, O=PolarSSL, CN=PolarSSL Test Intermediate CA\ndepth 0 - serial 10 - subject C=NL, O=PolarSSL, CN=localhost\n"
+
+X509 Certificate verification callback: intermediate ca trusted
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECDSA_C:MBEDTLS_RSA_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_PKCS1_V15:MBEDTLS_SHA256_C
+x509_verify_callback:"data_files/server7_int-ca_ca2.crt":"data_files/test-int-ca.crt":0:"depth 1 - serial 0E - subject C=NL, O=PolarSSL, CN=PolarSSL Test Intermediate CA\ndepth 0 - serial 10 - subject C=NL, O=PolarSSL, CN=localhost\n"
+
+X509 Certificate verification callback: two intermediates
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECDSA_C:MBEDTLS_RSA_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_PKCS1_V15:MBEDTLS_SHA256_C
+x509_verify_callback:"data_files/server10_int3_int-ca2.crt":"data_files/test-ca_cat21.crt":0:"depth 3 - serial 00 - subject C=NL, O=PolarSSL, CN=PolarSSL Test CA\ndepth 2 - serial 0F - subject C=NL, O=PolarSSL, CN=PolarSSL Test Intermediate EC CA\ndepth 1 - serial 4D - subject C=UK, O=mbed TLS, CN=mbed TLS Test intermediate CA 3\ndepth 0 - serial 4B - subject CN=localhost\n"
+
+X509 Certificate verification callback: two intermediates, root included
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECDSA_C:MBEDTLS_RSA_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_PKCS1_V15:MBEDTLS_SHA256_C
+x509_verify_callback:"data_files/server10_int3_int-ca2_ca.crt":"data_files/test-ca_cat21.crt":0:"depth 3 - serial 00 - subject C=NL, O=PolarSSL, CN=PolarSSL Test CA\ndepth 2 - serial 0F - subject C=NL, O=PolarSSL, CN=PolarSSL Test Intermediate EC CA\ndepth 1 - serial 4D - subject C=UK, O=mbed TLS, CN=mbed TLS Test intermediate CA 3\ndepth 0 - serial 4B - subject CN=localhost\n"
+
+X509 Certificate verification callback: two intermediates, top int trusted
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECDSA_C:MBEDTLS_RSA_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_PKCS1_V15:MBEDTLS_SHA256_C
+x509_verify_callback:"data_files/server10_int3_int-ca2.crt":"data_files/test-int-ca2.crt":0:"depth 2 - serial 0F - subject C=NL, O=PolarSSL, CN=PolarSSL Test Intermediate EC CA\ndepth 1 - serial 4D - subject C=UK, O=mbed TLS, CN=mbed TLS Test intermediate CA 3\ndepth 0 - serial 4B - subject CN=localhost\n"
+
+X509 Certificate verification callback: two intermediates, low int trusted
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECDSA_C:MBEDTLS_RSA_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_PKCS1_V15:MBEDTLS_SHA256_C
+x509_verify_callback:"data_files/server10_int3_int-ca2_ca.crt":"data_files/test-int-ca3.crt":0:"depth 1 - serial 4D - subject C=UK, O=mbed TLS, CN=mbed TLS Test intermediate CA 3\ndepth 0 - serial 4B - subject CN=localhost\n"
+
 X509 Parse Selftest
 depends_on:MBEDTLS_SHA1_C:MBEDTLS_PEM_PARSE_C:MBEDTLS_CERTS_C
 x509_selftest:
diff --git a/tests/suites/test_suite_x509parse.function b/tests/suites/test_suite_x509parse.function
index 1061d03..95fc287 100644
--- a/tests/suites/test_suite_x509parse.function
+++ b/tests/suites/test_suite_x509parse.function
@@ -26,6 +26,46 @@ int verify_all( void *data, mbedtls_x509_crt *crt, int certificate_depth, uint32
     return 0;
 }
 
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+typedef struct {
+    char buf[512];
+    char *p;
+} verify_print_context;
+
+void verify_print_init( verify_print_context *ctx )
+{
+    memset( ctx, 0, sizeof( verify_print_context ) );
+    ctx->p = ctx->buf;
+}
+
+int verify_print( void *data, mbedtls_x509_crt *crt, int certificate_depth, uint32_t *flags )
+{
+    int ret;
+    verify_print_context *ctx = (verify_print_context *) data;
+    char *p = ctx->p;
+    size_t n = ctx->buf + sizeof( ctx->buf ) - ctx->p;
+    ((void) flags);
+
+    ret = mbedtls_snprintf( p, n, "depth %d - serial ", certificate_depth );
+    MBEDTLS_X509_SAFE_SNPRINTF;
+
+    ret = mbedtls_x509_serial_gets( p, n, &crt->serial );
+    MBEDTLS_X509_SAFE_SNPRINTF;
+
+    ret = mbedtls_snprintf( p, n, " - subject " );
+    MBEDTLS_X509_SAFE_SNPRINTF;
+
+    ret = mbedtls_x509_dn_gets( p, n, &crt->subject );
+    MBEDTLS_X509_SAFE_SNPRINTF;
+
+    ret = mbedtls_snprintf( p, n, "\n" );
+    MBEDTLS_X509_SAFE_SNPRINTF;
+
+    ctx->p = p;
+
+    return( 0 );
+}
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
 /* END_HEADER */
 
 /* BEGIN_DEPENDENCIES
@@ -164,6 +204,35 @@ exit:
 /* END_CASE */
 
 /* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C */
+void x509_verify_callback( char *crt_file, char *ca_file,
+                           int exp_ret, char *exp_vrfy_out )
+{
+    int ret;
+    mbedtls_x509_crt crt;
+    mbedtls_x509_crt ca;
+    uint32_t flags = 0;
+    verify_print_context vrfy_ctx;
+
+    mbedtls_x509_crt_init( &crt );
+    mbedtls_x509_crt_init( &ca );
+    verify_print_init( &vrfy_ctx );
+
+    TEST_ASSERT( mbedtls_x509_crt_parse_file( &crt, crt_file ) == 0 );
+    TEST_ASSERT( mbedtls_x509_crt_parse_file( &ca, ca_file ) == 0 );
+
+    ret = mbedtls_x509_crt_verify( &crt, &ca, NULL, NULL, &flags,
+                                   verify_print, &vrfy_ctx );
+
+    TEST_ASSERT( ret == exp_ret );
+    TEST_ASSERT( strcmp( vrfy_ctx.buf, exp_vrfy_out ) == 0 );
+
+exit:
+    mbedtls_x509_crt_free( &crt );
+    mbedtls_x509_crt_free( &ca );
+}
+/* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C */
 void mbedtls_x509_dn_gets( char *crt_file, char *entity, char *result_str )
 {
     mbedtls_x509_crt   crt;
diff --git a/yotta/data/module.json b/yotta/data/module.json
index 6f6f9e8..812f306 100644
--- a/yotta/data/module.json
+++ b/yotta/data/module.json
@@ -1,6 +1,6 @@
 {
     "name": "mbedtls",
-    "version": "2.0.6",
+    "version": "2.0.7",
     "description": "The mbed TLS crypto/SSL/TLS library",
     "private": true,
     "licenses": [