Add the brainpoolp512r1 curve and use it.

[tinc] / src / openssl / ecdh.c

diff --git a/src/openssl/ecdh.c b/src/openssl/ecdh.c
index 7640674..fde8e8a 100644 (file)
--- a/src/openssl/ecdh.c
+++ b/src/openssl/ecdh.c
@@ -1,6 +1,6 @@
 /*
     ecdh.c -- Diffie-Hellman key exchange handling
-    Copyright (C) 2011 Guus Sliepen <guus@tinc-vpn.org>
+    Copyright (C) 2011-2013 Guus Sliepen <guus@tinc-vpn.org>
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -17,64 +17,82 @@
     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
-#include "system.h"
-#include "utils.h"
-#include "xalloc.h"
+#include "../system.h"
 
 #include <openssl/err.h>
 #include <openssl/ec.h>
+#include <openssl/ecdh.h>
 #include <openssl/obj_mac.h>
 
-#include "ecdh.h"
-#include "logger.h"
+#define __TINC_ECDH_INTERNAL__
+typedef EC_KEY ecdh_t;
 
-// TODO: proper KDF
-static void *kdf(const void *in, size_t inlen, void *out, size_t *outlen) {
-       memcpy(out, in, inlen);
-       *outlen = inlen;
-       return out;
-}
+#include "../ecdh.h"
+#include "../logger.h"
+#include "../utils.h"
+#include "../xalloc.h"
+
+#include "brainpool.h"
+
+ecdh_t *ecdh_generate_public(void *pubkey) {
+       ecdh_t *ecdh = EC_KEY_new();
+       if(!ecdh) {
+               logger(DEBUG_ALWAYS, LOG_ERR, "Allocating EC key failed: %s", ERR_error_string(ERR_get_error(), NULL));
+               return false;
+       }
 
-bool ecdh_generate_public(ecdh_t *ecdh, void *pubkey) {
-       *ecdh = EC_KEY_new_by_curve_name(NID_secp521r1);
-       if(!EC_KEY_generate_key(*ecdh)) {
-               logger(LOG_ERR, "Generating EC key failed: %s", ERR_error_string(ERR_get_error(), NULL));
-               abort();
+       if(!EC_KEY_set_group(ecdh, brainpoolp512r1) || !EC_KEY_generate_key(ecdh)) {
+               EC_KEY_free(ecdh);
+               logger(DEBUG_ALWAYS, LOG_ERR, "Generating EC key failed: %s", ERR_error_string(ERR_get_error(), NULL));
+               return NULL;
        }
-       
-       const EC_POINT *point = EC_KEY_get0_public_key(*ecdh);
+
+       const EC_POINT *point = EC_KEY_get0_public_key(ecdh);
        if(!point) {
-               logger(LOG_ERR, "Getting public key failed: %s", ERR_error_string(ERR_get_error(), NULL));
-               abort();
+               EC_KEY_free(ecdh);
+               logger(DEBUG_ALWAYS, LOG_ERR, "Getting public key failed: %s", ERR_error_string(ERR_get_error(), NULL));
+               return NULL;
        }
 
-       size_t result = EC_POINT_point2oct(EC_KEY_get0_group(*ecdh), point, POINT_CONVERSION_COMPRESSED, pubkey, ECDH_SIZE, NULL);
+       size_t result = EC_POINT_point2oct(EC_KEY_get0_group(ecdh), point, POINT_CONVERSION_COMPRESSED, pubkey, ECDH_SIZE, NULL);
        if(!result) {
-               logger(LOG_ERR, "Converting EC_POINT to binary failed: %s", ERR_error_string(ERR_get_error(), NULL));
-               abort();
+               EC_KEY_free(ecdh);
+               logger(DEBUG_ALWAYS, LOG_ERR, "Converting EC_POINT to binary failed: %s", ERR_error_string(ERR_get_error(), NULL));
+               return NULL;
        }
 
-       return true;
+       return ecdh;
 }
 
 bool ecdh_compute_shared(ecdh_t *ecdh, const void *pubkey, void *shared) {
-       EC_POINT *point = EC_POINT_new(EC_KEY_get0_group(*ecdh));
-
-       int result = EC_POINT_oct2point(EC_KEY_get0_group(*ecdh), point, pubkey, ECDH_SIZE, NULL);
+       EC_POINT *point = EC_POINT_new(EC_KEY_get0_group(ecdh));
        if(!point) {
-               logger(LOG_ERR, "Converting binary to EC_POINT failed: %s", ERR_error_string(ERR_get_error(), NULL));
-               abort();
+               logger(DEBUG_ALWAYS, LOG_ERR, "EC_POINT_new() failed: %s", ERR_error_string(ERR_get_error(), NULL));
+               EC_KEY_free(ecdh);
+               return false;
        }
 
-       result = ECDH_compute_key(shared, ECDH_SIZE, point, *ecdh, kdf);
+       int result = EC_POINT_oct2point(EC_KEY_get0_group(ecdh), point, pubkey, ECDH_SIZE, NULL);
+       if(!result) {
+               EC_POINT_free(point);
+               EC_KEY_free(ecdh);
+               logger(DEBUG_ALWAYS, LOG_ERR, "Converting binary to EC_POINT failed: %s", ERR_error_string(ERR_get_error(), NULL));
+               return false;
+       }
+
+       result = ECDH_compute_key(shared, ECDH_SIZE, point, ecdh, NULL);
        EC_POINT_free(point);
-       EC_KEY_free(*ecdh);
-       *ecdh = NULL;
+       EC_KEY_free(ecdh);
 
        if(!result) {
-               logger(LOG_ERR, "Computing Elliptic Curve Diffie-Hellman shared key failed: %s", ERR_error_string(ERR_get_error(), NULL));
+               logger(DEBUG_ALWAYS, LOG_ERR, "Computing Elliptic Curve Diffie-Hellman shared key failed: %s", ERR_error_string(ERR_get_error(), NULL));
                return false;
        }
 
        return true;
 }
+
+void ecdh_free(ecdh_t *ecdh) {
+       if(ecdh)
+               EC_KEY_free(ecdh);
+}