git / moonbite-core / src/crypto/hkdf_sha256_32.h · raw

// 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.#ifndef BITCOIN_CRYPTO_HKDF_SHA256_32_H#define BITCOIN_CRYPTO_HKDF_SHA256_32_H#include <crypto/hmac_sha256.h>#include <stdint.h>#include <stdlib.h>/** A rfc5869 HKDF implementation with HMAC_SHA256 and fixed key output length of 32 bytes (L=32) */class CHKDF_HMAC_SHA256_L32{private:    unsigned char m_prk[32];    static const size_t OUTPUT_SIZE = 32;public:    CHKDF_HMAC_SHA256_L32(const unsigned char* ikm, size_t ikmlen, const std::string& salt);    void Expand32(const std::string& info, unsigned char hash[OUTPUT_SIZE]);};#endif // BITCOIN_CRYPTO_HKDF_SHA256_32_H