crypto: introduce generic cipher API & built-in implementation

Introduce a generic cipher API and an implementation of it that
supports only the built-in AES and DES-RFB algorithms.

The test suite checks the supported algorithms + modes to
validate that every backend implementation is actually correctly
complying with the specs.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-Id: <1435770638-25715-5-git-send-email-berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

3 files changed, 293 insertions, 0 deletions

diff --git a/tests/.gitignore b/tests/.gitignore
index 18f60f1..ccc92e4 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -10,6 +10,7 @@ rcutorture
 test-aio
 test-bitops
 test-coroutine
+test-crypto-cipher
 test-crypto-hash
 test-cutils
 test-hbitmap
diff --git a/tests/Makefile b/tests/Makefile
index 8c7f1ac..09838ac 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -75,6 +75,7 @@ gcov-files-test-qemu-opts-y = qom/test-qemu-opts.c
 check-unit-y += tests/test-write-threshold$(EXESUF)
 gcov-files-test-write-threshold-y = block/write-threshold.c
 check-unit-$(CONFIG_GNUTLS_HASH) += tests/test-crypto-hash$(EXESUF)
+check-unit-y += tests/test-crypto-cipher$(EXESUF)
 
 check-block-$(CONFIG_POSIX) += tests/qemu-iotests-quick.sh
 
@@ -341,6 +342,7 @@ tests/test-opts-visitor$(EXESUF): tests/test-opts-visitor.o $(test-qapi-obj-y) l
 tests/test-mul64$(EXESUF): tests/test-mul64.o libqemuutil.a
 tests/test-bitops$(EXESUF): tests/test-bitops.o libqemuutil.a
 tests/test-crypto-hash$(EXESUF): tests/test-crypto-hash.o libqemuutil.a libqemustub.a
+tests/test-crypto-cipher$(EXESUF): tests/test-crypto-cipher.o libqemuutil.a libqemustub.a
 
 libqos-obj-y = tests/libqos/pci.o tests/libqos/fw_cfg.o tests/libqos/malloc.o
 libqos-obj-y += tests/libqos/i2c.o tests/libqos/libqos.o
diff --git a/tests/test-crypto-cipher.c b/tests/test-crypto-cipher.c
new file mode 100644
index 0000000..f9b1a03
--- /dev/null
+++ b/tests/test-crypto-cipher.c
@@ -0,0 +1,290 @@
+/*
+ * QEMU Crypto cipher algorithms
+ *
+ * Copyright (c) 2015 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <glib.h>
+
+#include "crypto/init.h"
+#include "crypto/cipher.h"
+
+typedef struct QCryptoCipherTestData QCryptoCipherTestData;
+struct QCryptoCipherTestData {
+    const char *path;
+    QCryptoCipherAlgorithm alg;
+    QCryptoCipherMode mode;
+    const char *key;
+    const char *plaintext;
+    const char *ciphertext;
+    const char *iv;
+};
+
+/* AES test data comes from appendix F of:
+ *
+ * http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf
+ */
+static QCryptoCipherTestData test_data[] = {
+    {
+        /* NIST F.1.1 ECB-AES128.Encrypt */
+        .path = "/crypto/cipher/aes-ecb-128",
+        .alg = QCRYPTO_CIPHER_ALG_AES_128,
+        .mode = QCRYPTO_CIPHER_MODE_ECB,
+        .key = "2b7e151628aed2a6abf7158809cf4f3c",
+        .plaintext =
+            "6bc1bee22e409f96e93d7e117393172a"
+            "ae2d8a571e03ac9c9eb76fac45af8e51"
+            "30c81c46a35ce411e5fbc1191a0a52ef"
+            "f69f2445df4f9b17ad2b417be66c3710",
+        .ciphertext =
+            "3ad77bb40d7a3660a89ecaf32466ef97"
+            "f5d3d58503b9699de785895a96fdbaaf"
+            "43b1cd7f598ece23881b00e3ed030688"
+            "7b0c785e27e8ad3f8223207104725dd4"
+    },
+    {
+        /* NIST F.1.3 ECB-AES192.Encrypt */
+        .path = "/crypto/cipher/aes-ecb-192",
+        .alg = QCRYPTO_CIPHER_ALG_AES_192,
+        .mode = QCRYPTO_CIPHER_MODE_ECB,
+        .key = "8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b",
+        .plaintext  =
+            "6bc1bee22e409f96e93d7e117393172a"
+            "ae2d8a571e03ac9c9eb76fac45af8e51"
+            "30c81c46a35ce411e5fbc1191a0a52ef"
+            "f69f2445df4f9b17ad2b417be66c3710",
+        .ciphertext =
+            "bd334f1d6e45f25ff712a214571fa5cc"
+            "974104846d0ad3ad7734ecb3ecee4eef"
+            "ef7afd2270e2e60adce0ba2face6444e"
+            "9a4b41ba738d6c72fb16691603c18e0e"
+    },
+    {
+        /* NIST F.1.5 ECB-AES256.Encrypt */
+        .path = "/crypto/cipher/aes-ecb-256",
+        .alg = QCRYPTO_CIPHER_ALG_AES_256,
+        .mode = QCRYPTO_CIPHER_MODE_ECB,
+        .key =
+            "603deb1015ca71be2b73aef0857d7781"
+            "1f352c073b6108d72d9810a30914dff4",
+        .plaintext  =
+            "6bc1bee22e409f96e93d7e117393172a"
+            "ae2d8a571e03ac9c9eb76fac45af8e51"
+            "30c81c46a35ce411e5fbc1191a0a52ef"
+            "f69f2445df4f9b17ad2b417be66c3710",
+        .ciphertext =
+            "f3eed1bdb5d2a03c064b5a7e3db181f8"
+            "591ccb10d410ed26dc5ba74a31362870"
+            "b6ed21b99ca6f4f9f153e7b1beafed1d"
+            "23304b7a39f9f3ff067d8d8f9e24ecc7",
+    },
+    {
+        /* NIST F.2.1 CBC-AES128.Encrypt */
+        .path = "/crypto/cipher/aes-cbc-128",
+        .alg = QCRYPTO_CIPHER_ALG_AES_128,
+        .mode = QCRYPTO_CIPHER_MODE_CBC,
+        .key = "2b7e151628aed2a6abf7158809cf4f3c",
+        .iv = "000102030405060708090a0b0c0d0e0f",
+        .plaintext  =
+            "6bc1bee22e409f96e93d7e117393172a"
+            "ae2d8a571e03ac9c9eb76fac45af8e51"
+            "30c81c46a35ce411e5fbc1191a0a52ef"
+            "f69f2445df4f9b17ad2b417be66c3710",
+        .ciphertext =
+            "7649abac8119b246cee98e9b12e9197d"
+            "5086cb9b507219ee95db113a917678b2"
+            "73bed6b8e3c1743b7116e69e22229516"
+            "3ff1caa1681fac09120eca307586e1a7",
+    },
+    {
+        /* NIST F.2.3 CBC-AES128.Encrypt */
+        .path = "/crypto/cipher/aes-cbc-192",
+        .alg = QCRYPTO_CIPHER_ALG_AES_192,
+        .mode = QCRYPTO_CIPHER_MODE_CBC,
+        .key = "8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b",
+        .iv = "000102030405060708090a0b0c0d0e0f",
+        .plaintext  =
+            "6bc1bee22e409f96e93d7e117393172a"
+            "ae2d8a571e03ac9c9eb76fac45af8e51"
+            "30c81c46a35ce411e5fbc1191a0a52ef"
+            "f69f2445df4f9b17ad2b417be66c3710",
+        .ciphertext =
+            "4f021db243bc633d7178183a9fa071e8"
+            "b4d9ada9ad7dedf4e5e738763f69145a"
+            "571b242012fb7ae07fa9baac3df102e0"
+            "08b0e27988598881d920a9e64f5615cd",
+    },
+    {
+        /* NIST F.2.5 CBC-AES128.Encrypt */
+        .path = "/crypto/cipher/aes-cbc-256",
+        .alg = QCRYPTO_CIPHER_ALG_AES_256,
+        .mode = QCRYPTO_CIPHER_MODE_CBC,
+        .key =
+            "603deb1015ca71be2b73aef0857d7781"
+            "1f352c073b6108d72d9810a30914dff4",
+        .iv = "000102030405060708090a0b0c0d0e0f",
+        .plaintext  =
+            "6bc1bee22e409f96e93d7e117393172a"
+            "ae2d8a571e03ac9c9eb76fac45af8e51"
+            "30c81c46a35ce411e5fbc1191a0a52ef"
+            "f69f2445df4f9b17ad2b417be66c3710",
+        .ciphertext =
+            "f58c4c04d6e5f1ba779eabfb5f7bfbd6"
+            "9cfc4e967edb808d679f777bc6702c7d"
+            "39f23369a9d9bacfa530e26304231461"
+            "b2eb05e2c39be9fcda6c19078c6a9d1b",
+    },
+    {
+        .path = "/crypto/cipher/des-rfb-ecb-56",
+        .alg = QCRYPTO_CIPHER_ALG_DES_RFB,
+        .mode = QCRYPTO_CIPHER_MODE_ECB,
+        .key = "0123456789abcdef",
+        .plaintext =
+            "6bc1bee22e409f96e93d7e117393172a"
+            "ae2d8a571e03ac9c9eb76fac45af8e51"
+            "30c81c46a35ce411e5fbc1191a0a52ef"
+            "f69f2445df4f9b17ad2b417be66c3710",
+        .ciphertext =
+            "8f346aaf64eaf24040720d80648c52e7"
+            "aefc616be53ab1a3d301e69d91e01838"
+            "ffd29f1bb5596ad94ea2d8e6196b7f09"
+            "30d8ed0bf2773af36dd82a6280c20926",
+    },
+};
+
+
+static inline int unhex(char c)
+{
+    if (c >= 'a' && c <= 'f') {
+        return 10 + (c - 'a');
+    }
+    if (c >= 'A' && c <= 'F') {
+        return 10 + (c - 'A');
+    }
+    return c - '0';
+}
+
+static inline char hex(int i)
+{
+    if (i < 10) {
+        return '0' + i;
+    }
+    return 'a' + (i - 10);
+}
+
+static size_t unhex_string(const char *hexstr,
+                           uint8_t **data)
+{
+    size_t len;
+    size_t i;
+
+    if (!hexstr) {
+        *data = NULL;
+        return 0;
+    }
+
+    len = strlen(hexstr);
+    *data = g_new0(uint8_t, len / 2);
+
+    for (i = 0; i < len; i += 2) {
+        (*data)[i/2] = (unhex(hexstr[i]) << 4) | unhex(hexstr[i+1]);
+    }
+    return len / 2;
+}
+
+static char *hex_string(const uint8_t *bytes,
+                        size_t len)
+{
+    char *hexstr = g_new0(char, len * 2 + 1);
+    size_t i;
+
+    for (i = 0; i < len; i++) {
+        hexstr[i*2] = hex((bytes[i] >> 4) & 0xf);
+        hexstr[i*2+1] = hex(bytes[i] & 0xf);
+    }
+    hexstr[len*2] = '\0';
+
+    return hexstr;
+}
+
+static void test_cipher(const void *opaque)
+{
+    const QCryptoCipherTestData *data = opaque;
+
+    QCryptoCipher *cipher;
+    Error *err = NULL;
+    uint8_t *key, *iv, *ciphertext, *plaintext, *outtext;
+    size_t nkey, niv, nciphertext, nplaintext;
+    char *outtexthex;
+
+    g_test_message("foo");
+    nkey = unhex_string(data->key, &key);
+    niv = unhex_string(data->iv, &iv);
+    nciphertext = unhex_string(data->ciphertext, &ciphertext);
+    nplaintext = unhex_string(data->plaintext, &plaintext);
+
+    g_assert(nciphertext == nplaintext);
+
+    outtext = g_new0(uint8_t, nciphertext);
+
+    cipher = qcrypto_cipher_new(
+        data->alg, data->mode,
+        key, nkey,
+        &err);
+    g_assert(cipher != NULL);
+    g_assert(err == NULL);
+
+
+    if (iv) {
+        g_assert(qcrypto_cipher_setiv(cipher,
+                                      iv, niv,
+                                      &err) == 0);
+        g_assert(err == NULL);
+    }
+    g_assert(qcrypto_cipher_encrypt(cipher,
+                                    plaintext,
+                                    outtext,
+                                    nplaintext,
+                                    &err) == 0);
+    g_assert(err == NULL);
+
+    outtexthex = hex_string(outtext, nciphertext);
+
+    g_assert_cmpstr(outtexthex, ==, data->ciphertext);
+
+    g_free(outtext);
+    g_free(outtexthex);
+    g_free(key);
+    g_free(iv);
+    g_free(ciphertext);
+    g_free(plaintext);
+    qcrypto_cipher_free(cipher);
+}
+
+int main(int argc, char **argv)
+{
+    size_t i;
+
+    g_test_init(&argc, &argv, NULL);
+
+    g_assert(qcrypto_init(NULL) == 0);
+
+    for (i = 0; i < G_N_ELEMENTS(test_data); i++) {
+        g_test_add_data_func(test_data[i].path, &test_data[i], test_cipher);
+    }
+    return g_test_run();
+}