tree 0a34902a963b2a8a8e25559ee75421682567d212
parent 8b9e7802acde5e7d811ede05360b03fb4720e104
author David Benjamin <davidben@google.com> 1456891052 -0500
committer Adam Langley <agl@google.com> 1456968979 +0000

Add a deterministic PRNG for fuzzing.

If running the stack through a fuzzer, we would like execution to be
completely deterministic. This is gated on a
BORINGSSL_UNSAFE_FUZZER_MODE #ifdef.

For now, this just uses the zero ChaCha20 key and a global counter. As
needed, we can extend this to a thread-local counter and a separate
ChaCha20 stream and counter per input length.

Change-Id: Ic6c9d8a25e70d68e5dc6804e2c234faf48e51395
Reviewed-on: https://boringssl-review.googlesource.com/7286
Reviewed-by: Adam Langley <agl@google.com>