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// 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
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