Replace base64 decoding.

This code has caused a long history of problems. This change rewrites it
completely with something that is, hopefully, much simplier and robust
and adds more testing.

Change-Id: Ibeef51f9386afd95d5b73316e451eb3a2d7ec4e0
Reviewed-on: https://boringssl-review.googlesource.com/8033
Reviewed-by: Adam Langley <agl@google.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/fuzz/read_pem.cc b/fuzz/read_pem.cc
new file mode 100644
index 0000000..511c4ee
--- /dev/null
+++ b/fuzz/read_pem.cc
@@ -0,0 +1,36 @@
+/* Copyright (c) 2016, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+#include <openssl/crypto.h>
+#include <openssl/mem.h>
+#include <openssl/pem.h>
+
+
+extern "C" int LLVMFuzzerTestOneInput(uint8_t *buf, size_t len) {
+  char *name, *header;
+  uint8_t *pem_data;
+  long pem_len;
+
+  BIO *bio = BIO_new_mem_buf(buf, len);
+
+  if (PEM_read_bio(bio, &name, &header, &pem_data, &pem_len) == 1) {
+    OPENSSL_free(name);
+    OPENSSL_free(header);
+    OPENSSL_free(pem_data);
+  }
+
+  BIO_free(bio);
+
+  return 0;
+}