Line data    Source code

       1             : // Copyright (c) 2014 The Bitcoin Core developers
       2             : // Distributed under the MIT software license, see the accompanying
       3             : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
       4             : 
       5             : #include <crypto/hmac_sha256.h>
       6             : 
       7             : #include <string.h>
       8             : 
       9        3530 : CHMAC_SHA256::CHMAC_SHA256(const unsigned char* key, size_t keylen)
      10        1765 : {
      11             :     unsigned char rkey[64];
      12        1765 :     if (keylen <= 64) {
      13        1761 :         memcpy(rkey, key, keylen);
      14        1761 :         memset(rkey + keylen, 0, 64 - keylen);
      15        1761 :     } else {
      16           4 :         CSHA256().Write(key, keylen).Finalize(rkey);
      17           4 :         memset(rkey + 32, 0, 32);
      18             :     }
      19             : 
      20      114725 :     for (int n = 0; n < 64; n++)
      21      112960 :         rkey[n] ^= 0x5c;
      22        1765 :     outer.Write(rkey, 64);
      23             : 
      24      114725 :     for (int n = 0; n < 64; n++)
      25      112960 :         rkey[n] ^= 0x5c ^ 0x36;
      26        1765 :     inner.Write(rkey, 64);
      27        3530 : }
      28             : 
      29        5190 : void CHMAC_SHA256::Finalize(unsigned char hash[OUTPUT_SIZE])
      30             : {
      31             :     unsigned char temp[32];
      32        5190 :     inner.Finalize(temp);
      33        5190 :     outer.Write(temp, 32).Finalize(hash);
      34        5190 : }