mirror of
https://github.com/PurpleI2P/i2pd
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46 lines
864 B
C++
46 lines
864 B
C++
/*
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* Copyright (c) 2013-2020, The PurpleI2P Project
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*
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* This file is part of Purple i2pd project and licensed under BSD3
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*
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* See full license text in LICENSE file at top of project tree
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*/
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#ifndef ELLIGATOR_H__
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#define ELLIGATOR_H__
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#include <inttypes.h>
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#include <memory>
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#include <openssl/bn.h>
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namespace i2p
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{
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namespace crypto
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{
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class Elligator2
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{
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public:
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Elligator2 ();
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~Elligator2 ();
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bool Encode (const uint8_t * key, uint8_t * encoded, bool highY = false, bool random = true) const;
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bool Decode (const uint8_t * encoded, uint8_t * key) const;
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private:
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void SquareRoot (const BIGNUM * x, BIGNUM * r, BN_CTX * ctx) const;
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int Legendre (const BIGNUM * a, BN_CTX * ctx) const; // a/p
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private:
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BIGNUM * p, * p38, * p12, * p14, * sqrtn1, * A, * nA, * u, * iu;
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};
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std::unique_ptr<Elligator2>& GetElligator ();
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}
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}
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#endif
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