From 4c3877418d919a9d96dfdd7ab57c289599e4a473 Mon Sep 17 00:00:00 2001 From: Elena Petrova Date: Tue, 28 May 2019 13:41:52 +0100 Subject: [PATCH] crypto: arm64/sha1-ce - correct digest for empty data in finup 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: stable@vger.kernel.org Signed-off-by: Elena Petrova Reviewed-by: Ard Biesheuvel Signed-off-by: Herbert Xu Signed-off-by: Greg Kroah-Hartman --- arch/arm64/crypto/sha1-ce-glue.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/crypto/sha1-ce-glue.c b/arch/arm64/crypto/sha1-ce-glue.c index ea319c055f5d..1b7b4684c35b 100644 --- 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_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; /* * Allow the asm code to perform the finalization if there is no