/*
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* Copyright (C) 2015 Southern Storm Software, Pty Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef CRYPTO_CURVE25519_h
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#define CRYPTO_CURVE25519_h
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#include "BigNumberUtil.h"
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class Ed25519;
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class Curve25519
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{
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public:
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static bool eval(uint8_t result[32], const uint8_t s[32], const uint8_t x[32]);
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static void dh1(uint8_t k[32], uint8_t f[32]);
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static bool dh2(uint8_t k[32], uint8_t f[32]);
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#if defined(TEST_CURVE25519_FIELD_OPS)
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public:
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#else
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private:
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#endif
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static uint8_t isWeakPoint(const uint8_t k[32]);
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static void reduce(limb_t *result, limb_t *x, uint8_t size);
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static limb_t reduceQuick(limb_t *x);
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static void mulNoReduce(limb_t *result, const limb_t *x, const limb_t *y);
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static void mul(limb_t *result, const limb_t *x, const limb_t *y);
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static void square(limb_t *result, const limb_t *x)
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{
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mul(result, x, x);
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}
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static void mulA24(limb_t *result, const limb_t *x);
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static void mul_P(limb_t *result, const limb_t *x, const limb_t *y);
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static void add(limb_t *result, const limb_t *x, const limb_t *y);
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static void sub(limb_t *result, const limb_t *x, const limb_t *y);
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static void cswap(limb_t select, limb_t *x, limb_t *y);
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static void cmove(limb_t select, limb_t *x, const limb_t *y);
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static void pow250(limb_t *result, const limb_t *x);
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static void recip(limb_t *result, const limb_t *x);
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static bool sqrt(limb_t *result, const limb_t *x);
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// Constructor and destructor are private - cannot instantiate this class.
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Curve25519() {}
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~Curve25519() {}
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friend class Ed25519;
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};
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#endif
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