Branch data     Line data    Source code

       1                 :             : // Copyright (c) 2018-2019 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/hkdf_sha256_32.h>
       6                 :             : 
       7                 :             : #include <assert.h>
       8                 :             : #include <string.h>
       9                 :             : 
      10                 :         438 : CHKDF_HMAC_SHA256_L32::CHKDF_HMAC_SHA256_L32(const unsigned char* ikm, size_t ikmlen, const std::string& salt)
      11                 :             : {
      12                 :         438 :     CHMAC_SHA256((const unsigned char*)salt.data(), salt.size()).Write(ikm, ikmlen).Finalize(m_prk);
      13                 :         438 : }
      14                 :             : 
      15                 :        2613 : void CHKDF_HMAC_SHA256_L32::Expand32(const std::string& info, unsigned char hash[OUTPUT_SIZE])
      16                 :             : {
      17                 :             :     // expand a 32byte key (single round)
      18         [ -  + ]:        2613 :     assert(info.size() <= 128);
      19                 :        2613 :     static const unsigned char one[1] = {1};
      20                 :        2613 :     CHMAC_SHA256(m_prk, 32).Write((const unsigned char*)info.data(), info.size()).Write(one, 1).Finalize(hash);
      21                 :        2613 : }