crypto: inside-secure - let HW deal with initial hash digest

The driver was loading the initial digest for hash operations into
the hardware explicitly, but this is not needed as the hardware can
handle that by itself, which is more efficient and avoids any context
record coherence issues.
Signed-off-by: Pascal van Leeuwen <pvanleeuwen@verimatrix.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/inside-secure/safexcel_hash.c

@@ -641,8 +641,12 @@ static int safexcel_ahash_final(struct ahash_request *areq)
 	req->last_req = true;
 	req->finish = true;
 
-	/* If we have an overall 0 length request */
-	if (!req->len[0] && !req->len[1] && !areq->nbytes) {
+	if (unlikely(!req->len[0] && !req->len[1] && !areq->nbytes)) {
+		/*
+		 * If we have an overall 0 length *hash* request:
+		 * The HW cannot do 0 length hash, so we provide the correct
+		 * result directly here.
+		 */
 		if (ctx->alg == CONTEXT_CONTROL_CRYPTO_ALG_MD5)
 			memcpy(areq->result, md5_zero_message_hash,
 			       MD5_DIGEST_SIZE);
@@ -751,12 +755,6 @@ static int safexcel_sha1_init(struct ahash_request *areq)
 
 	memset(req, 0, sizeof(*req));
 
-	req->state[0] = SHA1_H0;
-	req->state[1] = SHA1_H1;
-	req->state[2] = SHA1_H2;
-	req->state[3] = SHA1_H3;
-	req->state[4] = SHA1_H4;
-
 	ctx->alg = CONTEXT_CONTROL_CRYPTO_ALG_SHA1;
 	req->digest = CONTEXT_CONTROL_DIGEST_PRECOMPUTED;
 	req->state_sz = SHA1_DIGEST_SIZE;
@@ -1065,15 +1063,6 @@ static int safexcel_sha256_init(struct ahash_request *areq)
 
 	memset(req, 0, sizeof(*req));
 
-	req->state[0] = SHA256_H0;
-	req->state[1] = SHA256_H1;
-	req->state[2] = SHA256_H2;
-	req->state[3] = SHA256_H3;
-	req->state[4] = SHA256_H4;
-	req->state[5] = SHA256_H5;
-	req->state[6] = SHA256_H6;
-	req->state[7] = SHA256_H7;
-
 	ctx->alg = CONTEXT_CONTROL_CRYPTO_ALG_SHA256;
 	req->digest = CONTEXT_CONTROL_DIGEST_PRECOMPUTED;
 	req->state_sz = SHA256_DIGEST_SIZE;
@@ -1128,15 +1117,6 @@ static int safexcel_sha224_init(struct ahash_request *areq)
 
 	memset(req, 0, sizeof(*req));
 
-	req->state[0] = SHA224_H0;
-	req->state[1] = SHA224_H1;
-	req->state[2] = SHA224_H2;
-	req->state[3] = SHA224_H3;
-	req->state[4] = SHA224_H4;
-	req->state[5] = SHA224_H5;
-	req->state[6] = SHA224_H6;
-	req->state[7] = SHA224_H7;
-
 	ctx->alg = CONTEXT_CONTROL_CRYPTO_ALG_SHA224;
 	req->digest = CONTEXT_CONTROL_DIGEST_PRECOMPUTED;
 	req->state_sz = SHA256_DIGEST_SIZE;
@@ -1305,23 +1285,6 @@ static int safexcel_sha512_init(struct ahash_request *areq)
 
 	memset(req, 0, sizeof(*req));
 
-	req->state[0] = lower_32_bits(SHA512_H0);
-	req->state[1] = upper_32_bits(SHA512_H0);
-	req->state[2] = lower_32_bits(SHA512_H1);
-	req->state[3] = upper_32_bits(SHA512_H1);
-	req->state[4] = lower_32_bits(SHA512_H2);
-	req->state[5] = upper_32_bits(SHA512_H2);
-	req->state[6] = lower_32_bits(SHA512_H3);
-	req->state[7] = upper_32_bits(SHA512_H3);
-	req->state[8] = lower_32_bits(SHA512_H4);
-	req->state[9] = upper_32_bits(SHA512_H4);
-	req->state[10] = lower_32_bits(SHA512_H5);
-	req->state[11] = upper_32_bits(SHA512_H5);
-	req->state[12] = lower_32_bits(SHA512_H6);
-	req->state[13] = upper_32_bits(SHA512_H6);
-	req->state[14] = lower_32_bits(SHA512_H7);
-	req->state[15] = upper_32_bits(SHA512_H7);
-
 	ctx->alg = CONTEXT_CONTROL_CRYPTO_ALG_SHA512;
 	req->digest = CONTEXT_CONTROL_DIGEST_PRECOMPUTED;
 	req->state_sz = SHA512_DIGEST_SIZE;
@@ -1376,23 +1339,6 @@ static int safexcel_sha384_init(struct ahash_request *areq)
 
 	memset(req, 0, sizeof(*req));
 
-	req->state[0] = lower_32_bits(SHA384_H0);
-	req->state[1] = upper_32_bits(SHA384_H0);
-	req->state[2] = lower_32_bits(SHA384_H1);
-	req->state[3] = upper_32_bits(SHA384_H1);
-	req->state[4] = lower_32_bits(SHA384_H2);
-	req->state[5] = upper_32_bits(SHA384_H2);
-	req->state[6] = lower_32_bits(SHA384_H3);
-	req->state[7] = upper_32_bits(SHA384_H3);
-	req->state[8] = lower_32_bits(SHA384_H4);
-	req->state[9] = upper_32_bits(SHA384_H4);
-	req->state[10] = lower_32_bits(SHA384_H5);
-	req->state[11] = upper_32_bits(SHA384_H5);
-	req->state[12] = lower_32_bits(SHA384_H6);
-	req->state[13] = upper_32_bits(SHA384_H6);
-	req->state[14] = lower_32_bits(SHA384_H7);
-	req->state[15] = upper_32_bits(SHA384_H7);
-
 	ctx->alg = CONTEXT_CONTROL_CRYPTO_ALG_SHA384;
 	req->digest = CONTEXT_CONTROL_DIGEST_PRECOMPUTED;
 	req->state_sz = SHA512_DIGEST_SIZE;
@@ -1561,11 +1507,6 @@ static int safexcel_md5_init(struct ahash_request *areq)
 
 	memset(req, 0, sizeof(*req));
 
-	req->state[0] = MD5_H0;
-	req->state[1] = MD5_H1;
-	req->state[2] = MD5_H2;
-	req->state[3] = MD5_H3;
-
 	ctx->alg = CONTEXT_CONTROL_CRYPTO_ALG_MD5;
 	req->digest = CONTEXT_CONTROL_DIGEST_PRECOMPUTED;
 	req->state_sz = MD5_DIGEST_SIZE;