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Date: Mon, 29 Jul 2019 21:20:12 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Elena Petrova <lenaptr@...gle.com>, Ard Biesheuvel <ard.biesheuvel@...aro.org>, Herbert Xu <herbert@...dor.apana.org.au> Subject: [PATCH 4.14 121/293] crypto: arm64/sha1-ce - correct digest for empty data in finup From: Elena Petrova <lenaptr@...gle.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: stable@...r.kernel.org Signed-off-by: Elena Petrova <lenaptr@...gle.com> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@...aro.org> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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 @@ -54,7 +54,7 @@ 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; if (!may_use_simd()) return crypto_sha1_finup(desc, data, len, out);
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