mirror of
https://github.com/taigrr/arduinolibs
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82 lines
3.0 KiB
C++
82 lines
3.0 KiB
C++
/*
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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_ED25519_h
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#define CRYPTO_ED25519_h
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#include "BigNumberUtil.h"
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#include "SHA512.h"
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class Ed25519
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{
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public:
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static void sign(uint8_t signature[64], const uint8_t privateKey[32],
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const uint8_t publicKey[32], const void *message,
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size_t len);
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static void sign(uint8_t signature[64], const uint8_t keyPair[64],
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const void *message, size_t len);
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static bool verify(const uint8_t signature[64], const uint8_t publicKey[32],
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const void *message, size_t len);
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static void generatePrivateKey(uint8_t privateKey[32]);
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static void derivePublicKey(uint8_t publicKey[32], const uint8_t privateKey[32]);
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static void generateKeyPair(uint8_t keyPair[64]);
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private:
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// Constructor and destructor are private - cannot instantiate this class.
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Ed25519();
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~Ed25519();
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// Curve point represented in extended homogeneous coordinates.
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struct Point
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{
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limb_t x[32 / sizeof(limb_t)];
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limb_t y[32 / sizeof(limb_t)];
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limb_t z[32 / sizeof(limb_t)];
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limb_t t[32 / sizeof(limb_t)];
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};
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static void reduceQFromBuffer(limb_t *result, const uint8_t buf[64], limb_t *temp);
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static void reduceQ(limb_t *result, limb_t *r);
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static void mul(Point &result, const limb_t *s, Point &p, bool constTime = true);
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static void mul(Point &result, const limb_t *s, bool constTime = true);
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static void add(Point &p, const Point &q);
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static bool equal(const Point &p, const Point &q);
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static void encodePoint(uint8_t *buf, Point &point);
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static bool decodePoint(Point &point, const uint8_t *buf);
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static void deriveKeys(SHA512 *hash, limb_t *a, const uint8_t privateKey[32]);
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};
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inline void Ed25519::sign(uint8_t signature[64], const uint8_t keyPair[64],
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const void *message, size_t len)
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{
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sign(signature, keyPair, keyPair + 32, message, len);
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}
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#endif
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