_ Git - BearSSL/blob - src/ec/ecdsa_i15_sign_asn1.c

   1 /*
   2  * Copyright (c) 2017 Thomas Pornin <pornin@bolet.org>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining
   5  * a copy of this software and associated documentation files (the
   6  * "Software"), to deal in the Software without restriction, including
   7  * without limitation the rights to use, copy, modify, merge, publish,
   8  * distribute, sublicense, and/or sell copies of the Software, and to
   9  * permit persons to whom the Software is furnished to do so, subject to
  10  * the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  */
  24
  25 #include "inner.h"
  26
  27 #define ORDER_LEN   ((BR_MAX_EC_SIZE + 7) >> 3)
  28
  29 /* see bearssl_ec.h */
  30 size_t
  31 br_ecdsa_i15_sign_asn1(const br_ec_impl *impl,
  32         const br_hash_class *hf, const void *hash_value,
  33         const br_ec_private_key *sk, void *sig)
  34 {
  35         unsigned char rsig[(ORDER_LEN << 1) + 12];
  36         size_t sig_len;
  37
  38         sig_len = br_ecdsa_i15_sign_raw(impl, hf, hash_value, sk, rsig);
  39         if (sig_len == 0) {
  40                 return 0;
  41         }
  42         sig_len = br_ecdsa_raw_to_asn1(rsig, sig_len);
  43         memcpy(sig, rsig, sig_len);
  44         return sig_len;
  45 }