[PATCH v3 4/5] crypto: marvell: fix wrong hash results

[Russell King <rmk+kernel@arm.linux.org.uk>]

Attempting to use the sha1 digest for openssh via openssl reveals that
the result from the hash is wrong: this happens when we export the
state from one socket and import it into another via calling accept().

The reason for this is because the operation is reset to "initial block"
state, whereas we may be past the first fragment of data to be hashed.

Arrange for the operation code to avoid the initialisation of the state,
thereby preserving the imported state.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 drivers/crypto/marvell/hash.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/crypto/marvell/hash.c b/drivers/crypto/marvell/hash.c
index 458867ce9515..b7c2c05f1a01 100644
--- a/drivers/crypto/marvell/hash.c
+++ b/drivers/crypto/marvell/hash.c
@@ -835,6 +835,11 @@ static int mv_cesa_md5_import(struct ahash_request *req, const void *in)
 	if (ret)
 		return ret;
 
+	if (in_state->byte_count >= sizeof(in_state->block))
+		mv_cesa_update_op_cfg(&creq->op_tmpl,
+				      CESA_SA_DESC_CFG_MID_FRAG,
+				      CESA_SA_DESC_CFG_FRAG_MSK);
+
 	creq->len = in_state->byte_count;
 	memcpy(creq->state, in_state->hash, digsize);
 	creq->cache_ptr = 0;
@@ -929,6 +934,11 @@ static int mv_cesa_sha1_import(struct ahash_request *req, const void *in)
 	if (ret)
 		return ret;
 
+	if (in_state->count >= SHA1_BLOCK_SIZE)
+		mv_cesa_update_op_cfg(&creq->op_tmpl,
+				      CESA_SA_DESC_CFG_MID_FRAG,
+				      CESA_SA_DESC_CFG_FRAG_MSK);
+
 	creq->len = in_state->count;
 	memcpy(creq->state, in_state->state, digsize);
 	creq->cache_ptr = 0;
@@ -1034,6 +1044,11 @@ static int mv_cesa_sha256_import(struct ahash_request *req, const void *in)
 	if (ret)
 		return ret;
 
+	if (in_state->count >= SHA256_BLOCK_SIZE)
+		mv_cesa_update_op_cfg(&creq->op_tmpl,
+				      CESA_SA_DESC_CFG_MID_FRAG,
+				      CESA_SA_DESC_CFG_FRAG_MSK);
+
 	creq->len = in_state->count;
 	memcpy(creq->state, in_state->state, digsize);
 	creq->cache_ptr = 0;
-- 
2.1.0