_ Git - BearSSL/blob - src/rsa/rsa_i62_oaep_decrypt.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_oaep_decrypt(const br_hash_class *dig,
  32         const void *label, size_t label_len,
  33         const br_rsa_private_key *sk, void *data, size_t *len)
  34 {
  35         uint32_t r;
  36
  37         if (*len != ((sk->n_bitlen + 7) >> 3)) {
  38                 return 0;
  39         }
  40         r = br_rsa_i62_private(data, sk);
  41         r &= br_rsa_oaep_unpad(dig, label, label_len, data, len);
  42         return r;
  43 }
  44
  45 /* see bearssl_rsa.h */
  46 br_rsa_oaep_decrypt
  47 br_rsa_i62_oaep_decrypt_get(void)
  48 {
  49         return &br_rsa_i62_oaep_decrypt;
  50 }
  51
  52 #else
  53
  54 /* see bearssl_rsa.h */
  55 br_rsa_oaep_decrypt
  56 br_rsa_i62_oaep_decrypt_get(void)
  57 {
  58         return 0;
  59 }
  60
  61 #endif