1 files changed, 56 insertions, 0 deletions
diff --git a/eddsa-pubkey.c b/eddsa-pubkey.c
new file mode 100644
index 00000000..d1546707
--- /dev/null
+++ b/eddsa-pubkey.c
@@ -0,0 +1,56 @@
+/* eddsa-pubkey.c
+
+   Copyright (C) 2015 Niels Möller
+
+   This file is part of GNU Nettle.
+
+   GNU Nettle is free software: you can redistribute it and/or
+   modify it under the terms of either:
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at your
+       option) any later version.
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 2 of the License, or (at your
+       option) any later version.
+
+   or both in parallel, as here.
+
+   GNU Nettle 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
+   General Public License for more details.
+
+   You should have received copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see http://www.gnu.org/licenses/.
+*/
+
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include "eddsa.h"
+
+#include "ecc-internal.h"
+
+mp_size_t
+_eddsa_public_key_itch (const struct ecc_curve *ecc)
+{
+  return 3*ecc->p.size + ecc->mul_g_itch;
+}
+
+void
+_eddsa_public_key (const struct ecc_curve *ecc,
+		   const mp_limb_t *k, uint8_t *pub, mp_limb_t *scratch)
+{
+#define P scratch
+#define scratch_out (scratch + 3*ecc->p.size)
+  ecc->mul_g (ecc, P, k, scratch_out);
+  _eddsa_compress (ecc, pub, P, scratch_out);
+#undef P
+#undef scratch_out
+}