crypto: sha1-s390 - Add export/import support

This patch adds export/import support to sha1-s390.  The exported
type is defined by struct sha1_state, which is basically the entire
descriptor state of sha1_generic.

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

1 files changed, 26 insertions, 0 deletions

diff --git a/arch/s390/crypto/sha1_s390.c b/arch/s390/crypto/sha1_s390.c
index e85ba348722a..2c5ec7969e37 100644
--- a/arch/s390/crypto/sha1_s390.c
+++ b/arch/s390/crypto/sha1_s390.c
@@ -46,12 +46,38 @@ static int sha1_init(struct shash_desc *desc)
         return 0;
 }
 
+static int sha1_export(struct shash_desc *desc, void *out)
+{
+        struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
+        struct sha1_state *octx = out;
+
+        octx->count = sctx->count;
+        memcpy(octx->state, sctx->state, sizeof(octx->state));
+        memcpy(octx->buffer, sctx->buf, sizeof(octx->buffer));
+        return 0;
+}
+
+static int sha1_import(struct shash_desc *desc, const u8 *in)
+{
+        struct sha1_state *sctx = shash_desc_ctx(desc);
+        struct sha1_state *ictx = in;
+
+        sctx->count = ictx->count;
+        memcpy(sctx->state, ictx->state, sizeof(ictx->state));
+        memcpy(sctx->buf, ictx->buffer, sizeof(ictx->buffer));
+        sctx->func = KIMD_SHA_1;
+        return 0;
+}
+
 static struct shash_alg alg = {
         .digestsize     =       SHA1_DIGEST_SIZE,
         .init           =       sha1_init,
         .update         =       s390_sha_update,
         .final          =       s390_sha_final,
+        .export         =       sha1_export,
+        .import         =       sha1_import,
         .descsize       =       sizeof(struct s390_sha_ctx),
+        .statesize      =       sizeof(struct sha1_state),
         .base           =       {
                 .cra_name       =       "sha1",
                 .cra_driver_name=       "sha1-s390",