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crypto: arm64/sha2-ce - correct digest for empty data in finup

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The sha256-ce finup implementation for ARM64 produces wrong digest
for empty input (len=0). Expected: the actual digest, result: initial
value of SHA internal state. The error is in sha256_ce_finup:
for empty data `finalize` will be 1, so the code is relying on
sha2_ce_transform to make the final round. However, in
sha256_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: 03802f6a80 ("crypto: arm64/sha2-ce - move SHA-224/256 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>
This commit is contained in:
Elena Petrova 2019-05-28 15:35:06 +01:00 committed by Herbert Xu
parent 1d4aaf16de
commit 6bd934de1e
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/crypto/sha2-ce-glue.c
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@ -60,7 +60,7 @@ static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
struct sha256_ce_state *sctx = shash_desc_ctx(desc);
bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE);
bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE) && len;
if (!crypto_simd_usable()) {
if (len)