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librhash: Avoid signed left-shift overflow in sha256

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Fix `rhash_sha256_final` to use unsigned integers for left shifting to
avoid the possibility of undefined overflow behavior.
This commit is contained in:
Brad King
2016-11-29 08:28:31 -05:00
parent d0ff3e701c
commit 9e07ffa4e4
1 changed files with 2 additions and 2 deletions
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4
Utilities/cmlibrhash/librhash/sha256.c
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@@ -218,8 +218,8 @@ void rhash_sha256_final(sha256_ctx *ctx, unsigned char* result)
/* pad message and run for last block */ /* pad message and run for last block */
/* append the byte 0x80 to the message */ /* append the byte 0x80 to the message */
ctx->message[index] &= le2me_32(~(0xFFFFFFFF << shift)); ctx->message[index] &= le2me_32(~(0xFFFFFFFFu << shift));
ctx->message[index++] ^= le2me_32(0x80 << shift); ctx->message[index++] ^= le2me_32(0x80u << shift);
/* if no room left in the message to store 64-bit message length */ /* if no room left in the message to store 64-bit message length */
if (index > 14) { if (index > 14) {