crypto: nx - fix SHA-2 for chunks bigger than block size

Each call to the co-processor, with exception of the last call, needs to
send data that is multiple of block size. As consequence, any remaining
data is kept in the internal NX context.

This patch fixes a bug in the driver that causes it to save incorrect
data into the context when data is bigger than the block size.

Reviewed-by: Joy Latten <jmlatten@linux.vnet.ibm.com>
Signed-off-by: Marcelo Cerri <mhcerri@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

2 files changed, 2 insertions, 2 deletions

diff --git a/drivers/crypto/nx/nx-sha256.c b/drivers/crypto/nx/nx-sha256.c
index 6547a7104bf6..da0b24a7633f 100644
--- a/drivers/crypto/nx/nx-sha256.c
+++ b/drivers/crypto/nx/nx-sha256.c
@@ -129,7 +129,7 @@ static int nx_sha256_update(struct shash_desc *desc, const u8 *data,
                 NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
 
                 total -= to_process;
-                data += to_process;
+                data += to_process - sctx->count;
                 sctx->count = 0;
                 in_sg = nx_ctx->in_sg;
         } while (leftover >= SHA256_BLOCK_SIZE);
diff --git a/drivers/crypto/nx/nx-sha512.c b/drivers/crypto/nx/nx-sha512.c
index 236e6afeab10..4ae5b0f221d5 100644
--- a/drivers/crypto/nx/nx-sha512.c
+++ b/drivers/crypto/nx/nx-sha512.c
@@ -131,7 +131,7 @@ static int nx_sha512_update(struct shash_desc *desc, const u8 *data,
                 NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
 
                 total -= to_process;
-                data += to_process;
+                data += to_process - sctx->count[0];
                 sctx->count[0] = 0;
                 in_sg = nx_ctx->in_sg;
         } while (leftover >= SHA512_BLOCK_SIZE);