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45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
#include <cryptopp/integer.h>
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#include <cryptopp/eccrypto.h>
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#include "Signature.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 Ed25519
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{
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public:
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Ed25519 (): b(256)
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{
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q = CryptoPP::Integer::Power2 (255) - CryptoPP::Integer (19); // 2^255-19
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l = CryptoPP::Integer::Power2 (252) + CryptoPP::Integer ("27742317777372353535851937790883648493");
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// 2^252 + 27742317777372353535851937790883648493
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d = CryptoPP::Integer (-121665) * CryptoPP::Integer (121666).InverseMod (q); // -121665/121666
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}
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private:
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CryptoPP::ECP::Point Sum (CryptoPP::ECP::Point p1, CryptoPP::ECP::Point p2)
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{
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CryptoPP::Integer m = d*p1.x*p2.x*p1.y*p2.y,
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x = a_times_b_mod_c (p1.x*p2.y + p2.x*p1.y, (CryptoPP::Integer::One() + m).InverseMod (q), q),
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y = a_times_b_mod_c (p1.y*p2.y + p1.x*p2.x, (CryptoPP::Integer::One() - m).InverseMod (q), q);
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return CryptoPP::ECP::Point {x, y};
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}
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CryptoPP::ECP::Point Mul (CryptoPP::ECP::Point p, CryptoPP::Integer e)
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{
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if (e.IsZero ()) return CryptoPP::ECP::Point {0, 1};
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return p; // TODO
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}
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private:
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CryptoPP::Integer b, q, l, d;
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};
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}
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}
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