Add digest session cloning

1 files changed, 29 insertions, 0 deletions

diff --git a/lib/ncrypto_local.c b/lib/ncrypto_local.c
index 16bd781..15ae38c 100644
--- a/lib/ncrypto_local.c
+++ b/lib/ncrypto_local.c
@@ -269,6 +269,35 @@ ncr_digest_free (struct ncr_digest_session *sess)
 }
 
 CK_RV
+ncr_digest_clone (struct ncr_digest_session **clone,
+		  struct ncr_digest_session *sess)
+{
+  struct ncr_digest_session *c;
+
+  g_return_val_if_fail (clone != NULL, CKR_ARGUMENTS_BAD);
+  g_return_val_if_fail (sess != NULL, CKR_SESSION_HANDLE_INVALID);
+  g_return_val_if_fail (sess->state == NDS_INITIALIZED
+			|| sess->state == NDS_UPDATED,
+			CKR_OPERATION_NOT_INITIALIZED);
+
+  c = malloc (sizeof (*c));
+  if (c == NULL)
+    return CKR_HOST_MEMORY;
+
+  EVP_MD_CTX_init (&c->ctx);
+  if (EVP_MD_CTX_copy_ex (&c->ctx, &sess->ctx) == 0)
+    {
+      free (c);
+      return ckr_openssl ();
+    }
+  c->state = sess->state;
+  c->md = sess->md;
+  c->md_size = sess->md_size;
+  *clone = c;
+  return CKR_OK;
+}
+
+CK_RV
 ncr_digest_init (struct ncr_digest_session *sess)
 {
   g_return_val_if_fail (sess != NULL, CKR_SESSION_HANDLE_INVALID);