release/src/router/tinc/src/openssl/ecdsagen.c

   1 /*
   2     ecdsagen.c -- ECDSA key generation and export
   3     Copyright (C) 2011-2013 Guus Sliepen <guus@tinc-vpn.org>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License along
  16     with this program; if not, write to the Free Software Foundation, Inc.,
  17     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "../system.h"
  21
  22 #include <openssl/pem.h>
  23 #include <openssl/err.h>
  24 #include <openssl/obj_mac.h>
  25
  26 #define __TINC_ECDSA_INTERNAL__
  27 typedef EC_KEY ecdsa_t;
  28
  29 #include "../ecdsagen.h"
  30 #include "../utils.h"
  31 #include "../xalloc.h"
  32
  33 // Generate ECDSA key
  34
  35 ecdsa_t *ecdsa_generate(void) {
  36         ecdsa_t *ecdsa = EC_KEY_new_by_curve_name(NID_secp521r1);
  37
  38         if(!ecdsa || !EC_KEY_generate_key(ecdsa)) {
  39                 fprintf(stderr, "Generating EC key failed: %s", ERR_error_string(ERR_get_error(), NULL));
  40                 ecdsa_free(ecdsa);
  41                 return false;
  42         }
  43
  44         EC_KEY_set_asn1_flag(ecdsa, OPENSSL_EC_NAMED_CURVE);
  45         EC_KEY_set_conv_form(ecdsa, POINT_CONVERSION_COMPRESSED);
  46
  47         return ecdsa;
  48 }
  49
  50 // Write PEM ECDSA keys
  51
  52 bool ecdsa_write_pem_public_key(ecdsa_t *ecdsa, FILE *fp) {
  53         return PEM_write_EC_PUBKEY(fp, ecdsa);
  54 }
  55
  56 bool ecdsa_write_pem_private_key(ecdsa_t *ecdsa, FILE *fp) {
  57         return PEM_write_ECPrivateKey(fp, ecdsa, NULL, NULL, 0, NULL, NULL);
  58 }