Commit 25c3d30c authored Apr 05, 2012 by Kent Yoder Committed by Herbert Xu Apr 05, 2012

crypto: sha512 - Fix byte counter overflow in SHA-512



The current code only increments the upper 64 bits of the SHA-512 byte
counter when the number of bytes hashed happens to hit 2^64 exactly.

This patch increments the upper 64 bits whenever the lower 64 bits
overflows.

Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>
Cc: stable@kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

parent 5219a534

crypto/sha512_generic.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -174,7 +174,7 @@ sha512_update(struct shash_desc desc, const u8 data, unsigned int len)
		index = sctx->count[0] & 0x7f;

		/* Update number of bytes */
		if (!(sctx->count[0] += len))
		if ((sctx->count[0] += len) < len)
		sctx->count[1]++;

		part_len = 128 - index;