Integrated ECDSA sign and verify functions.

1 files changed, 62 insertions, 0 deletions

diff --git a/ecc-scalar.c b/ecc-scalar.c
new file mode 100644
index 00000000..b4c98fde
--- /dev/null
+++ b/ecc-scalar.c
@@ -0,0 +1,62 @@
+/* ecc-scalar.c */
+
+/* nettle, low-level cryptographics library
+ *
+ * Copyright (C) 2013 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., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02111-1301, USA.
+ */
+
+/* Development of Nettle's ECC support was funded by Internetfonden. */
+
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include "ecc.h"
+#include "ecc-internal.h"
+#include "gmp-glue.h"
+
+void
+ecc_scalar_init (struct ecc_scalar *s, const struct ecc_curve *ecc)
+{
+  s->ecc = ecc;
+  s->p = _gmp_alloc_limbs (ecc->size);
+}
+
+void
+ecc_scalar_clear (struct ecc_scalar *s)
+{
+  _gmp_free_limbs (s->p, s->ecc->size);
+}
+
+int
+ecc_scalar_set (struct ecc_scalar *s, const mpz_t z)
+{
+  mp_size_t size = s->ecc->size;
+
+  if (mpz_sgn (z) <= 0 || _mpz_cmp_limbs (z, s->ecc->q, size) >= 0)
+    return 0;
+
+  _mpz_copy_limbs (s->p, z, size);
+  return 1;
+}
+
+void
+ecc_scalar_get (const struct ecc_scalar *s, mpz_t z)
+{
+  _mpz_set_mpn (z, s->p, s->ecc->size);  
+}