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 : : 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 : 6 : 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 : }