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authorElena Petrova <lenaptr@google.com>2019-05-28 13:41:52 +0100
committerHerbert Xu <herbert@gondor.apana.org.au>2019-06-06 14:38:57 +0800
commit1d4aaf16defa86d2665ae7db0259d6cb07e2091f (patch)
treef092870ddd4812c5726954889f7dccab91faa194 /arch/arm64/crypto
parent3b2614cb864d4114250f043ce6ff94e152198ae5 (diff)
downloadlinux-1d4aaf16defa86d2665ae7db0259d6cb07e2091f.tar.bz2
crypto: arm64/sha1-ce - correct digest for empty data in finup
The sha1-ce finup implementation for ARM64 produces wrong digest for empty input (len=0). Expected: da39a3ee..., result: 67452301... (initial value of SHA internal state). The error is in sha1_ce_finup: for empty data `finalize` will be 1, so the code is relying on sha1_ce_transform to make the final round. However, in sha1_base_do_update, the block function will not be called when len == 0. Fix it by setting finalize to 0 if data is empty. Fixes: 07eb54d306f4 ("crypto: arm64/sha1-ce - move SHA-1 ARMv8 implementation to base layer") Cc: stable@vger.kernel.org Signed-off-by: Elena Petrova <lenaptr@google.com> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'arch/arm64/crypto')
-rw-r--r--arch/arm64/crypto/sha1-ce-glue.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/crypto/sha1-ce-glue.c b/arch/arm64/crypto/sha1-ce-glue.c
index eaa7a8258f1c..0652f5f07ed1 100644
--- a/arch/arm64/crypto/sha1-ce-glue.c
+++ b/arch/arm64/crypto/sha1-ce-glue.c
@@ -55,7 +55,7 @@ static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
struct sha1_ce_state *sctx = shash_desc_ctx(desc);
- bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE);
+ bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE) && len;
if (!crypto_simd_usable())
return crypto_sha1_finup(desc, data, len, out);