Mercurial > dropbear
changeset 1773:c3ca130d193a
fuzzing - avoid sha1 for random seed every iteration
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Sun, 01 Nov 2020 14:01:37 +0800 |
| parents | 0cc85b4a4abb |
| children | 833bf9947603 |
| files | dbrandom.c |
| diffstat | 1 files changed, 11 insertions(+), 6 deletions(-) [+] |
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--- a/dbrandom.c Thu Oct 29 23:00:52 2020 +0800 +++ b/dbrandom.c Sun Nov 01 14:01:37 2020 +0800 @@ -151,12 +151,17 @@ #if DROPBEAR_FUZZ void fuzz_seed(const unsigned char* dat, unsigned int len) { - hash_state hs; - sha1_init(&hs); - sha1_process(&hs, "fuzzfuzzfuzz", strlen("fuzzfuzzfuzz")); - sha1_process(&hs, dat, len); - sha1_done(&hs, hashpool); - + static unsigned char keep_pool[SHA1_HASH_SIZE]; + static int once = 0; + if (!once) { + once = 1; + hash_state hs; + sha1_init(&hs); + sha1_process(&hs, "fuzzfuzzfuzz", strlen("fuzzfuzzfuzz")); + sha1_process(&hs, dat, len); + sha1_done(&hs, keep_pool); + } + memcpy(hashpool, keep_pool, sizeof(keep_pool)); counter = 0; donerandinit = 1; }