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#       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                 :            : CHKDF_HMAC_SHA256_L32::CHKDF_HMAC_SHA256_L32(const unsigned char* ikm, size_t ikmlen, const std::string& salt)
#      11                 :          6 : {
#      12                 :          6 :     CHMAC_SHA256((const unsigned char*)salt.data(), salt.size()).Write(ikm, ikmlen).Finalize(m_prk);
#      13                 :          6 : }
#      14                 :            : 
#      15                 :            : void CHKDF_HMAC_SHA256_L32::Expand32(const std::string& info, unsigned char hash[OUTPUT_SIZE])
#      16                 :          6 : {
#      17                 :            :     // expand a 32byte key (single round)
#      18                 :          6 :     assert(info.size() <= 128);
#      19                 :          0 :     static const unsigned char one[1] = {1};
#      20                 :          6 :     CHMAC_SHA256(m_prk, 32).Write((const unsigned char*)info.data(), info.size()).Write(one, 1).Finalize(hash);
#      21                 :          6 : }