Changeset View

Standalone View

				// Copyright (c) 2018 The Bitcoin Core developers
				// Distributed under the MIT software license, see the accompanying
				// file COPYING or http://www.opensource.org/licenses/mit-license.php.

				#include <crypto/hkdf_sha256_32.h>

				#include <cassert>
				#include <cstring>

				CHKDF_HMAC_SHA256_L32::CHKDF_HMAC_SHA256_L32(const uint8_t *ikm, size_t ikmlen,
				const std::string &salt) {
				CHMAC_SHA256((const uint8_t *)salt.c_str(), salt.size())
				.Write(ikm, ikmlen)
				.Finalize(m_prk);
				}

				void CHKDF_HMAC_SHA256_L32::Expand32(const std::string &info,
				uint8_t hash[OUTPUT_SIZE]) {
				// expand a 32byte key (single round)
				assert(info.size() <= 128);
				static const uint8_t one[1] = {1};
				CHMAC_SHA256(m_prk, 32)
				.Write((const uint8_t *)info.data(), info.size())
				.Write(one, 1)
				.Finalize(hash);
				}