1 files changed, 63 insertions, 0 deletions
diff --git a/rsa-sha256-sign.c b/rsa-sha256-sign.c
new file mode 100644
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--- /dev/null
+++ b/rsa-sha256-sign.c
@@ -0,0 +1,63 @@
+/* rsa-sha256-sign.c
+ *
+ * Signatures using RSA and SHA256.
+ */
+
+/* nettle, low-level cryptographics library
+ *
+ * Copyright (C) 2001, 2003, 2006 Niels Möller
+ *  
+ * The nettle library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or (at your
+ * option) any later version.
+ * 
+ * The nettle library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+ * License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with the nettle library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#if WITH_PUBLIC_KEY
+
+#include <assert.h>
+
+#include "rsa.h"
+
+#include "bignum.h"
+#include "pkcs1.h"
+
+void
+rsa_sha256_sign(const struct rsa_private_key *key,
+		struct sha256_ctx *hash,
+		mpz_t s)
+{
+  assert(key->size >= RSA_MINIMUM_N_OCTETS);
+
+  pkcs1_rsa_sha256_encode(s, key->size - 1, hash);
+
+  rsa_compute_root(key, s, s);
+}
+
+void
+rsa_sha256_sign_digest(const struct rsa_private_key *key,
+		       const uint8_t *digest,
+		       mpz_t s)
+{
+  assert(key->size >= RSA_MINIMUM_N_OCTETS);
+
+  pkcs1_rsa_sha256_encode_digest(s, key->size - 1, digest);
+
+  rsa_compute_root(key, s, s);
+}
+
+#endif /* WITH_PUBLIC_KEY */