General pkcs1 signature interface.

1 files changed, 49 insertions, 0 deletions

diff --git a/pkcs1-rsa-digest.c b/pkcs1-rsa-digest.c
new file mode 100644
index 00000000..e84db6d4
--- /dev/null
+++ b/pkcs1-rsa-digest.c
@@ -0,0 +1,49 @@
+/* pkcs1-rsa-digest.c
+ *
+ */
+
+/* nettle, low-level cryptographics library
+ *
+ * Copyright (C) 2001, 2003, 2012 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
+
+#include "pkcs1.h"
+
+#include "bignum.h"
+#include "nettle-internal.h"
+
+int
+pkcs1_rsa_digest_encode(mpz_t m, unsigned key_size,
+			unsigned di_length, const uint8_t *digest_info)
+{
+  TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_SIZE);
+  TMP_ALLOC(em, key_size);
+
+  if (pkcs1_signature_prefix(key_size, em,
+			     di_length, digest_info, 0))
+    {
+      nettle_mpz_set_str_256_u(m, key_size, em);
+      return 1;
+    }
+  else
+    return 0;
+}