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35 lines
1.2 KiB
35 lines
1.2 KiB
// Copyright (c) 2017-2019 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_CHACHA20_H
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#define BITCOIN_CRYPTO_CHACHA20_H
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#include <stdint.h>
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#include <stdlib.h>
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/** A class for ChaCha20 256-bit stream cipher developed by Daniel J. Bernstein
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https://cr.yp.to/chacha/chacha-20080128.pdf */
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class ChaCha20
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{
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private:
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uint32_t input[16];
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public:
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ChaCha20();
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ChaCha20(const unsigned char* key, size_t keylen);
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void SetKey(const unsigned char* key, size_t keylen); //!< set key with flexible keylength; 256bit recommended */
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void SetIV(uint64_t iv); // set the 64bit nonce
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void Seek(uint64_t pos); // set the 64bit block counter
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/** outputs the keystream of size <bytes> into <c> */
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void Keystream(unsigned char* c, size_t bytes);
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/** enciphers the message <input> of length <bytes> and write the enciphered representation into <output>
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* Used for encryption and decryption (XOR)
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*/
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void Crypt(const unsigned char* input, unsigned char* output, size_t bytes);
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};
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#endif // BITCOIN_CRYPTO_CHACHA20_H
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