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@xxxxxxxxxxxxxxxxxxx>
---
arch/s390/crypto/sha256_s390.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/arch/s390/crypto/sha256_s390.c b/arch/s390/crypto/sha256_s390.c
index f9fefc5..943a669 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",
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