[CRYPTO] s390: Generic sha_update and sha_final

The sha_{update|final} functions are similar for every sha variant.
Since that is error-prone and redundant replace these functions by
a shared generic implementation for s390.

Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 6 insertions, 84 deletions

diff --git a/arch/s390/crypto/sha256_s390.c b/arch/s390/crypto/sha256_s390.c
index 2a3d756b35d4..19c03fb6ba7e 100644
--- a/arch/s390/crypto/sha256_s390.c
+++ b/arch/s390/crypto/sha256_s390.c
@@ -22,16 +22,11 @@
 #include <crypto/sha.h>
 
 #include "crypt_s390.h"
-
-struct s390_sha256_ctx {
-	u64 count;		/* message length */
-	u32 state[8];
-	u8 buf[2 * SHA256_BLOCK_SIZE];
-};
+#include "sha.h"
 
 static void sha256_init(struct crypto_tfm *tfm)
 {
-	struct s390_sha256_ctx *sctx = crypto_tfm_ctx(tfm);
+	struct s390_sha_ctx *sctx = crypto_tfm_ctx(tfm);
 
 	sctx->state[0] = SHA256_H0;
 	sctx->state[1] = SHA256_H1;
@@ -42,79 +37,7 @@ static void sha256_init(struct crypto_tfm *tfm)
 	sctx->state[6] = SHA256_H6;
 	sctx->state[7] = SHA256_H7;
 	sctx->count = 0;
-}
-
-static void sha256_update(struct crypto_tfm *tfm, const u8 *data,
-			  unsigned int len)
-{
-	struct s390_sha256_ctx *sctx = crypto_tfm_ctx(tfm);
-	unsigned int index;
-	int ret;
-
-	/* how much is already in the buffer? */
-	index = sctx->count & 0x3f;
-
-	sctx->count += len;
-
-	if ((index + len) < SHA256_BLOCK_SIZE)
-		goto store;
-
-	/* process one stored block */
-	if (index) {
-		memcpy(sctx->buf + index, data, SHA256_BLOCK_SIZE - index);
-		ret = crypt_s390_kimd(KIMD_SHA_256, sctx->state, sctx->buf,
-				      SHA256_BLOCK_SIZE);
-		BUG_ON(ret != SHA256_BLOCK_SIZE);
-		data += SHA256_BLOCK_SIZE - index;
-		len -= SHA256_BLOCK_SIZE - index;
-	}
-
-	/* process as many blocks as possible */
-	if (len >= SHA256_BLOCK_SIZE) {
-		ret = crypt_s390_kimd(KIMD_SHA_256, sctx->state, data,
-				      len & ~(SHA256_BLOCK_SIZE - 1));
-		BUG_ON(ret != (len & ~(SHA256_BLOCK_SIZE - 1)));
-		data += ret;
-		len -= ret;
-	}
-
-store:
-	/* anything left? */
-	if (len)
-		memcpy(sctx->buf + index , data, len);
-}
-
-/* Add padding and return the message digest */
-static void sha256_final(struct crypto_tfm *tfm, u8 *out)
-{
-	struct s390_sha256_ctx *sctx = crypto_tfm_ctx(tfm);
-	u64 bits;
-	unsigned int index, end;
-	int ret;
-
-	/* must perform manual padding */
-	index = sctx->count & 0x3f;
-	end = (index < 56) ? SHA256_BLOCK_SIZE : (2 * SHA256_BLOCK_SIZE);
-
-	/* start pad with 1 */
-	sctx->buf[index] = 0x80;
-
-	/* pad with zeros */
-	index++;
-	memset(sctx->buf + index, 0x00, end - index - 8);
-
-	/* append message length */
-	bits = sctx->count * 8;
-	memcpy(sctx->buf + end - 8, &bits, sizeof(bits));
-
-	ret = crypt_s390_kimd(KIMD_SHA_256, sctx->state, sctx->buf, end);
-	BUG_ON(ret != end);
-
-	/* copy digest to out */
-	memcpy(out, sctx->state, SHA256_DIGEST_SIZE);
-
-	/* wipe context */
-	memset(sctx, 0, sizeof *sctx);
+	sctx->func = KIMD_SHA_256;
 }
 
 static struct crypto_alg alg = {
@@ -123,14 +46,14 @@ static struct crypto_alg alg = {
 	.cra_priority	=	CRYPT_S390_PRIORITY,
 	.cra_flags	=	CRYPTO_ALG_TYPE_DIGEST,
 	.cra_blocksize	=	SHA256_BLOCK_SIZE,
-	.cra_ctxsize	=	sizeof(struct s390_sha256_ctx),
+	.cra_ctxsize	=	sizeof(struct s390_sha_ctx),
 	.cra_module	=	THIS_MODULE,
 	.cra_list	=	LIST_HEAD_INIT(alg.cra_list),
 	.cra_u		=	{ .digest = {
 	.dia_digestsize	=	SHA256_DIGEST_SIZE,
 	.dia_init	=	sha256_init,
-	.dia_update	=	sha256_update,
-	.dia_final	=	sha256_final } }
+	.dia_update	=	s390_sha_update,
+	.dia_final	=	s390_sha_final } }
 };
 
 static int sha256_s390_init(void)
@@ -150,6 +73,5 @@ module_init(sha256_s390_init);
 module_exit(sha256_s390_fini);
 
 MODULE_ALIAS("sha256");
-
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");