From: Marc Stevens <marc@xxxxxxxxxxxxxxx>
Some big-endian platforms define _BIG_ENDIAN, which the test at the
beginning of file has missed. Also, when the input is not aligned,
some platforms trigger SIGBUS.
This change corresponds to 33a694a9 ("Fix issues with a big endian
platform", 2017-05-15) in the history of the upstream repository
https://github.com/cr-marcstevens/sha1collisiondetection
---
* So here is my attempt to clarify the log message (I left the
title as-is, but this change deals both with endianness and
alignment requirement).
Please look it over, and then sign-off your patch ;-)
Thanks.
P.S. I wonder how often "buf" is not aligned---could we somehow
optimize out memcpy when it is not necessary, or is it not worth
it?
sha1dc/sha1.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/sha1dc/sha1.c b/sha1dc/sha1.c
index 35e9dd5bf4..ae25318c47 100644
--- a/sha1dc/sha1.c
+++ b/sha1dc/sha1.c
@@ -20,7 +20,7 @@
*/
#if (defined(__BYTE_ORDER) && (__BYTE_ORDER == __BIG_ENDIAN)) || \
(defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __BIG_ENDIAN__)) || \
- defined(__BIG_ENDIAN__) || defined(__ARMEB__) || defined(__THUMBEB__) || defined(__AARCH64EB__) || \
+ defined(_BIG_ENDIAN) || defined(__BIG_ENDIAN__) || defined(__ARMEB__) || defined(__THUMBEB__) || defined(__AARCH64EB__) || \
defined(_MIPSEB) || defined(__MIPSEB) || defined(__MIPSEB__)
#define SHA1DC_BIGENDIAN 1
@@ -1728,7 +1728,8 @@ void SHA1DCUpdate(SHA1_CTX* ctx, const char* buf, size_t len)
while (len >= 64)
{
ctx->total += 64;
- sha1_process(ctx, (uint32_t*)(buf));
+ memcpy(ctx->buffer, buf, 64);
+ sha1_process(ctx, (uint32_t*)(ctx->buffer));
buf += 64;
len -= 64;
}
--
2.13.0-416-g4c6b804423