_ Git - BearSSL/blob - src/rsa/rsa_i62_pkcs1_vrfy.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 #if BR_INT128 || BR_UMUL128
  28
  29 /* see bearssl_rsa.h */
  30 uint32_t
  31 br_rsa_i62_pkcs1_vrfy(const unsigned char *x, size_t xlen,
  32         const unsigned char *hash_oid, size_t hash_len,
  33         const br_rsa_public_key *pk, unsigned char *hash_out)
  34 {
  35         unsigned char sig[BR_MAX_RSA_SIZE >> 3];
  36
  37         if (xlen > (sizeof sig)) {
  38                 return 0;
  39         }
  40         memcpy(sig, x, xlen);
  41         if (!br_rsa_i62_public(sig, xlen, pk)) {
  42                 return 0;
  43         }
  44         return br_rsa_pkcs1_sig_unpad(sig, xlen, hash_oid, hash_len, hash_out);
  45 }
  46
  47 /* see bearssl_rsa.h */
  48 br_rsa_pkcs1_vrfy
  49 br_rsa_i62_pkcs1_vrfy_get(void)
  50 {
  51         return &br_rsa_i62_pkcs1_vrfy;
  52 }
  53
  54 #else
  55
  56 /* see bearssl_rsa.h */
  57 br_rsa_pkcs1_vrfy
  58 br_rsa_i62_pkcs1_vrfy_get(void)
  59 {
  60         return 0;
  61 }
  62
  63 #endif