From: Elena Petrova <lena...@google.com>

commit 1d4aaf16defa86d2665ae7db0259d6cb07e2091f upstream.

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: sta...@vger.kernel.org
Signed-off-by: Elena Petrova <lena...@google.com>
Reviewed-by: Ard Biesheuvel <ard.biesheu...@linaro.org>
Signed-off-by: Herbert Xu <herb...@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 arch/arm64/crypto/sha1-ce-glue.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm64/crypto/sha1-ce-glue.c
+++ b/arch/arm64/crypto/sha1-ce-glue.c
@@ -50,7 +50,7 @@ static int sha1_ce_finup(struct shash_de
                         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;
 
        /*
         * Allow the asm code to perform the finalization if there is no


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