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>

diff --git a/arch/s390/crypto/sha256_s390.c b/arch/s390/crypto/sha256_s390.c
index f9fefc5..943a669 100644 (file)
--- 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",