[CRYPTO] sha512: Hardware acceleration for s390

Exploit the System z10 hardware acceleration for SHA512.

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

1 files changed, 9 insertions, 2 deletions

diff --git a/arch/s390/crypto/sha_common.c b/arch/s390/crypto/sha_common.c
index 80b6f2ba005e..9d6eb8c3d37e 100644
--- a/arch/s390/crypto/sha_common.c
+++ b/arch/s390/crypto/sha_common.c
@@ -59,12 +59,15 @@ void s390_sha_final(struct crypto_tfm *tfm, u8 *out)
         struct s390_sha_ctx *ctx = crypto_tfm_ctx(tfm);
         unsigned int bsize = crypto_tfm_alg_blocksize(tfm);
         u64 bits;
-        unsigned int index, end;
+        unsigned int index, end, plen;
         int ret;
 
+        /* SHA-512 uses 128 bit padding length */
+        plen = (bsize > SHA256_BLOCK_SIZE) ? 16 : 8;
+
         /* must perform manual padding */
         index = ctx->count & (bsize - 1);
-        end = (index < bsize - 8) ? bsize : (2 * bsize);
+        end = (index < bsize - plen) ? bsize : (2 * bsize);
 
         /* start pad with 1 */
         ctx->buf[index] = 0x80;
@@ -73,6 +76,10 @@ void s390_sha_final(struct crypto_tfm *tfm, u8 *out)
         /* pad with zeros */
         memset(ctx->buf + index, 0x00, end - index - 8);
 
+        /*
+         * Append message length. Well, SHA-512 wants a 128 bit lenght value,
+         * nevertheless we use u64, should be enough for now...
+         */
         bits = ctx->count * 8;
         memcpy(ctx->buf + end - 8, &bits, sizeof(bits));