37 lines
963 B
C
37 lines
963 B
C
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// Copyright (c) 2014 The Bitcoin 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_RFC6979_HMAC_SHA256_H
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#define BITCOIN_RFC6979_HMAC_SHA256_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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/** The RFC 6979 PRNG using HMAC-SHA256. */
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class RFC6979_HMAC_SHA256
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{
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private:
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unsigned char V[CHMAC_SHA256::OUTPUT_SIZE];
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unsigned char K[CHMAC_SHA256::OUTPUT_SIZE];
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bool retry;
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public:
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/**
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* Construct a new RFC6979 PRNG, using the given key and message.
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* The message is assumed to be already hashed.
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*/
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RFC6979_HMAC_SHA256(const unsigned char* key, size_t keylen, const unsigned char* msg, size_t msglen);
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/**
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* Generate a byte array.
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*/
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void Generate(unsigned char* output, size_t outputlen);
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~RFC6979_HMAC_SHA256();
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};
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#endif // BITCOIN_RFC6979_HMAC_SHA256_H
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