release/src/router/nettle/pkcs1-rsa-digest.c

   1 /* pkcs1-rsa-digest.c
   2  *
   3  */
   4
   5 /* nettle, low-level cryptographics library
   6  *
   7  * Copyright (C) 2001, 2003, 2012 Niels Möller
   8  *
   9  * The nettle library is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 of the License, or (at your
  12  * option) any later version.
  13  *
  14  * The nettle library is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  16  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  17  * License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with the nettle library; see the file COPYING.LIB.  If not, write to
  21  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  22  * MA 02111-1301, USA.
  23  */
  24
  25 #if HAVE_CONFIG_H
  26 # include "config.h"
  27 #endif
  28
  29 #include "pkcs1.h"
  30
  31 #include "bignum.h"
  32 #include "nettle-internal.h"
  33
  34 int
  35 pkcs1_rsa_digest_encode(mpz_t m, unsigned key_size,
  36                         unsigned di_length, const uint8_t *digest_info)
  37 {
  38   TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_SIZE);
  39   TMP_ALLOC(em, key_size);
  40
  41   if (_pkcs1_signature_prefix(key_size, em,
  42                               di_length, digest_info, 0))
  43     {
  44       nettle_mpz_set_str_256_u(m, key_size, em);
  45       return 1;
  46     }
  47   else
  48     return 0;
  49 }