From 78239167812194b3fd71e4179fa3e7ae6f264c45 Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Sun, 5 May 2013 00:21:03 +0200
Subject: [PATCH] Add signing to public interface

---
 include/secp256k1.h | 13 ++++++++++++-
 src/bench.c         |  4 ++++
 src/secp256k1.c     | 20 ++++++++++++++++++++
 3 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/include/secp256k1.h b/include/secp256k1.h
index ea78a0d693..e9944e5a6c 100644
--- a/include/secp256k1.h
+++ b/include/secp256k1.h
@@ -27,6 +27,13 @@ int secp256k1_ecdsa_verify(const unsigned char *msg, int msglen,
                            const unsigned char *sig, int siglen,
                            const unsigned char *pubkey, int pubkeylen);
 
+int secp256k1_ecdsa_sign(const unsigned char *msg, int msglen,
+                         unsigned char *sig, int* siglen,
+                         const unsigned char *seckey,
+                         const unsigned char *nonce);
+
+int secp256j1_ecdsa_seckey_verify(const unsigned char *seckey);
+
 /** Just validate a public key.
  *  Returns: 1: valid public key
  *           0: invalid public key
@@ -39,11 +46,15 @@ int secp256k1_ecdsa_pubkey_verify(const unsigned char *pubkey, int pubkeylen);
  *          seckey:     pointer to a 32-byte private key.
  *  Out:    pubkey:     pointer to a 33-byte (if compressed) or 65-byte (if uncompressed)
  *                      area to store the public key.
+ *          pubkeylen:  pointer to int that will be updated to contains the pubkey's
+ *                      length.
  *  Returns: 1: secret was valid, public key stores
  *           0: secret was invalid, try again.
  */
 /* NOT YET IMPLEMENTED */
-int secp256k1_ecdsa_pubkey_create(unsigned char *pubkey, int compressed, const unsigned char *seckey)
+int secp256k1_ecdsa_pubkey_create(unsigned char *pubkey, int *pubkeylen, const unsigned char *seckey, int compressed)
+
+int secp256k1_ecdsa_pubkey_decompress(unsigned char *pubkey, int *pubkeylen);
 
 #ifdef __cplusplus
 }
diff --git a/src/bench.c b/src/bench.c
index be5f40a839..468a454e01 100644
--- a/src/bench.c
+++ b/src/bench.c
@@ -1,3 +1,7 @@
+// Copyright (c) 2013 Pieter Wuille
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
 #include <stdio.h>
 
 #include "impl/num.h"
diff --git a/src/secp256k1.c b/src/secp256k1.c
index 4d7929a448..abe1df427e 100644
--- a/src/secp256k1.c
+++ b/src/secp256k1.c
@@ -44,3 +44,23 @@ end:
     return ret;
 }
 
+int secp256k1_ecdsa_sign(const unsigned char *message, int messagelen, unsigned char *signature, int *signaturelen, const unsigned char *seckey, const unsigned char *nonce) {
+    secp256k1_num_t sec, non, msg;
+    secp256k1_num_init(&sec);
+    secp256k1_num_init(&non);
+    secp256k1_num_init(&msg);
+    secp256k1_num_set_bin(&sec, seckey, 32);
+    secp256k1_num_set_bin(&non, nonce, 32);
+    secp256k1_num_set_bin(&msg, message, messagelen);
+    secp256k1_ecdsa_sig_t sig;
+    secp256k1_ecdsa_sig_init(&sig);
+    int ret = secp256k1_ecdsa_sig_sign(&sig, &sec, &msg, &non);
+    if (ret) {
+        secp256k1_ecdsa_sig_serialize(signature, signaturelen, &sig);
+    }
+    secp256k1_ecdsa_sig_free(&sig);
+    secp256k1_num_free(&msg);
+    secp256k1_num_free(&non);
+    secp256k1_num_free(&sec);
+    return ret;
+}