_ Git - BearSSL/blob - src/rsa/rsa_i62_pss_vrfy.c

   1 /*
   2  * Copyright (c) 2018 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_pss_vrfy(const unsigned char *x, size_t xlen,
  32         const br_hash_class *hf_data, const br_hash_class *hf_mgf1,
  33         const void *hash, size_t salt_len, const br_rsa_public_key *pk)
  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_pss_sig_unpad(hf_data, hf_mgf1,
  45                 hash, salt_len, pk, sig);
  46 }
  47
  48 /* see bearssl_rsa.h */
  49 br_rsa_pss_vrfy
  50 br_rsa_i62_pss_vrfy_get(void)
  51 {
  52         return &br_rsa_i62_pss_vrfy;
  53 }
  54
  55 #else
  56
  57 /* see bearssl_rsa.h */
  58 br_rsa_pss_vrfy
  59 br_rsa_i62_pss_vrfy_get(void)
  60 {
  61         return 0;
  62 }
  63
  64 #endif