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Diffstat (limited to 'arch/s390/crypto/sha256_s390.c')
-rw-r--r--arch/s390/crypto/sha256_s390.c38
1 files changed, 16 insertions, 22 deletions
diff --git a/arch/s390/crypto/sha256_s390.c b/arch/s390/crypto/sha256_s390.c
index 78436c6..2ced333 100644
--- a/arch/s390/crypto/sha256_s390.c
+++ b/arch/s390/crypto/sha256_s390.c
@@ -26,7 +26,7 @@
#define SHA256_BLOCK_SIZE 64
struct s390_sha256_ctx {
- u64 count;
+ u64 count; /* message length */
u32 state[8];
u8 buf[2 * SHA256_BLOCK_SIZE];
};
@@ -54,10 +54,9 @@ static void sha256_update(struct crypto_tfm *tfm, const u8 *data,
int ret;
/* how much is already in the buffer? */
- index = sctx->count / 8 & 0x3f;
+ index = sctx->count & 0x3f;
- /* update message bit length */
- sctx->count += len * 8;
+ sctx->count += len;
if ((index + len) < SHA256_BLOCK_SIZE)
goto store;
@@ -87,12 +86,17 @@ store:
memcpy(sctx->buf + index , data, len);
}
-static void pad_message(struct s390_sha256_ctx* sctx)
+/* Add padding and return the message digest */
+static void sha256_final(struct crypto_tfm *tfm, u8 *out)
{
- int index, end;
+ struct s390_sha256_ctx *sctx = crypto_tfm_ctx(tfm);
+ u64 bits;
+ unsigned int index, end;
+ int ret;
- index = sctx->count / 8 & 0x3f;
- end = index < 56 ? SHA256_BLOCK_SIZE : 2 * SHA256_BLOCK_SIZE;
+ /* 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;
@@ -102,21 +106,11 @@ static void pad_message(struct s390_sha256_ctx* sctx)
memset(sctx->buf + index, 0x00, end - index - 8);
/* append message length */
- memcpy(sctx->buf + end - 8, &sctx->count, sizeof sctx->count);
-
- sctx->count = end * 8;
-}
-
-/* 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);
-
- /* must perform manual padding */
- pad_message(sctx);
+ bits = sctx->count * 8;
+ memcpy(sctx->buf + end - 8, &bits, sizeof(bits));
- crypt_s390_kimd(KIMD_SHA_256, sctx->state, sctx->buf,
- sctx->count / 8);
+ 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);
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