From 14a44b4016d3350c85c419e1e1b683c1574cd86e Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Wed, 28 Mar 2012 20:47:06 +0200
Subject: Add keygen function

---
 src/config.c                                    | 12 ++++++++++
 src/fastd.h                                     |  2 ++
 src/protocol_ec25519_fhmqvc_xsalsa20_poly1305.c | 30 +++++++++++++++++++++++++
 src/protocol_null.c                             |  5 +++++
 4 files changed, 49 insertions(+)

diff --git a/src/config.c b/src/config.c
index af32975..6fd8def 100644
--- a/src/config.c
+++ b/src/config.c
@@ -146,6 +146,7 @@ void fastd_configure(fastd_context *ctx, fastd_config *conf, int argc, char *con
 	char *charptr;
 	char *endptr;
 	char *addrstr;
+	bool keygen = false;
 
 
 	while (i < argc) {
@@ -305,9 +306,20 @@ void fastd_configure(fastd_context *ctx, fastd_config *conf, int argc, char *con
 			continue;
 		}
 
+		IF_OPTION("--generate-key") {
+			keygen = true;
+			continue;
+		}
+
 		exit_error(ctx, "config error: unknown option `%s'", argv[i]);
 	}
 
+	if (keygen) {
+		ctx->conf = conf;
+		conf->protocol->generate_key(ctx);
+		exit(0);
+	}
+
 	conf->n_floating = 0;
 	conf->n_v4 = 0;
 	conf->n_v6 = 0;
diff --git a/src/fastd.h b/src/fastd.h
index cd6dbb2..5ea4260 100644
--- a/src/fastd.h
+++ b/src/fastd.h
@@ -71,6 +71,8 @@ struct _fastd_protocol {
 	void (*send)(fastd_context *ctx, fastd_peer *peer, fastd_buffer buffer);
 
 	void (*free_peer_state)(fastd_context *ctx, fastd_peer *peer);
+
+	void (*generate_key)(fastd_context *ctx);
 };
 
 struct _fastd_config {
diff --git a/src/protocol_ec25519_fhmqvc_xsalsa20_poly1305.c b/src/protocol_ec25519_fhmqvc_xsalsa20_poly1305.c
index 93f0432..33f20b3 100644
--- a/src/protocol_ec25519_fhmqvc_xsalsa20_poly1305.c
+++ b/src/protocol_ec25519_fhmqvc_xsalsa20_poly1305.c
@@ -691,6 +691,34 @@ static void protocol_free_peer_state(fastd_context *ctx, fastd_peer *peer) {
 }
 
 
+static void hexdump(const char *desc, unsigned char d[32]) {
+	printf("%s", desc);
+
+	int i;
+	for (i = 0; i < 32; i++)
+		printf("%02x", d[i]);
+
+	printf("\n");
+}
+
+static void protocol_generate_key(fastd_context *ctx) {
+	ecc_secret_key_256 secret_key;
+	ecc_public_key_256 public_key;
+
+	pr_info(ctx, "Reading 32 bytes from /dev/random...");
+
+	fastd_random_bytes(ctx, secret_key.s, 32, true);
+	ecc_25519_secret_sanitize(&secret_key, &secret_key);
+
+	ecc_25519_work work;
+	ecc_25519_scalarmult_base(&work, &secret_key);
+	ecc_25519_store(&public_key, &work);
+
+	hexdump("Secret: ", secret_key.s);
+	hexdump("Public: ", public_key.p);
+}
+
+
 const fastd_protocol fastd_protocol_ec25519_fhmqvc_xsalsa20_poly1305 = {
 	.name = "ec25519-fhmqvc-xsalsa20-poly1305",
 
@@ -705,4 +733,6 @@ const fastd_protocol fastd_protocol_ec25519_fhmqvc_xsalsa20_poly1305 = {
 	.send = protocol_send,
 
 	.free_peer_state = protocol_free_peer_state,
+
+	.generate_key = protocol_generate_key,
 };
diff --git a/src/protocol_null.c b/src/protocol_null.c
index cdf6694..77839d9 100644
--- a/src/protocol_null.c
+++ b/src/protocol_null.c
@@ -89,6 +89,9 @@ static void protocol_send(fastd_context *ctx, fastd_peer *peer, fastd_buffer buf
 static void protocol_free_peer_state(fastd_context *ctx, fastd_peer *peer) {
 }
 
+static void protocol_generate_key(fastd_context *ctx) {
+	exit_error(ctx, "trying to generate key for `null' protocol");
+}
 
 const fastd_protocol fastd_protocol_null = {
 	.name = "null",
@@ -104,4 +107,6 @@ const fastd_protocol fastd_protocol_null = {
 	.send = protocol_send,
 
 	.free_peer_state = protocol_free_peer_state,
+
+	.generate_key = protocol_generate_key,
 };
-- 
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