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26 lines
781 B
C
26 lines
781 B
C
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// Copyright (c) 2018 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_CRYPTO_HKDF_SHA256_32_H
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#define BITCOIN_CRYPTO_HKDF_SHA256_32_H
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#include <crypto/hmac_sha256.h>
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#include <stdint.h>
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#include <stdlib.h>
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/** A rfc5869 HKDF implementation with HMAC_SHA256 and fixed key output length of 32 bytes (L=32) */
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class CHKDF_HMAC_SHA256_L32
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{
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private:
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unsigned char m_prk[32];
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static const size_t OUTPUT_SIZE = 32;
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public:
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CHKDF_HMAC_SHA256_L32(const unsigned char* ikm, size_t ikmlen, const std::string& salt);
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void Expand32(const std::string& info, unsigned char hash[OUTPUT_SIZE]);
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};
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#endif // BITCOIN_CRYPTO_HKDF_SHA256_32_H
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