crypto: sha256-s390 - Add export/import support

This patch adds export/import support to sha256-s390.  The exported
type is defined by struct sha256_state, which is basically the entire
descriptor state of sha256_generic.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 26 insertions, 0 deletions

diff --git a/arch/s390/crypto/sha256_s390.c b/arch/s390/crypto/sha256_s390.c
index f9fefc569632..943a669452cf 100644
--- a/arch/s390/crypto/sha256_s390.c
+++ b/arch/s390/crypto/sha256_s390.c
@@ -42,12 +42,38 @@ static int sha256_init(struct shash_desc *desc)
         return 0;
 }
 
+static int sha256_export(struct shash_desc *desc, void *out)
+{
+        struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
+        struct sha256_state *octx = out;
+
+        octx->count = sctx->count;
+        memcpy(octx->state, sctx->state, sizeof(octx->state));
+        memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
+        return 0;
+}
+
+static int sha256_import(struct shash_desc *desc, const u8 *in)
+{
+        struct sha256_state *sctx = shash_desc_ctx(desc);
+        struct sha256_state *ictx = in;
+
+        sctx->count = ictx->count;
+        memcpy(sctx->state, ictx->state, sizeof(ictx->state));
+        memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
+        sctx->func = KIMD_SHA_256;
+        return 0;
+}
+
 static struct shash_alg alg = {
         .digestsize     =       SHA256_DIGEST_SIZE,
         .init           =       sha256_init,
         .update         =       s390_sha_update,
         .final          =       s390_sha_final,
+        .export         =       sha256_export,
+        .import         =       sha256_import,
         .descsize       =       sizeof(struct s390_sha_ctx),
+        .statesize      =       sizeof(struct sha256_state),
         .base           =       {
                 .cra_name       =       "sha256",
                 .cra_driver_name=       "sha256-s390",