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@ -1,3 +1,4 @@
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#include <memory>
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#include <cryptopp/integer.h>
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#include <cryptopp/eccrypto.h>
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#include "Log.h"
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@ -18,11 +19,22 @@ namespace crypto
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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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I = a_exp_b_mod_c (CryptoPP::Integer::Two (), (q - CryptoPP::Integer::One ()).DividedBy (4), q);
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B = DecodePoint (CryptoPP::Integer (4)*CryptoPP::Integer (5).InverseMod (q));
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}
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CryptoPP::ECP::Point DecodePublicKey (const uint8_t * key) const
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{
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return DecodePoint (CryptoPP::Integer (key, 32));
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}
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CryptoPP::ECP::Point GeneratePublicKey (const uint8_t * privateKey) const
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{
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return Mul (B, CryptoPP::Integer (privateKey, 32));
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}
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private:
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CryptoPP::ECP::Point Sum (const CryptoPP::ECP::Point& p1, const CryptoPP::ECP::Point& p2)
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CryptoPP::ECP::Point Sum (const CryptoPP::ECP::Point& p1, const CryptoPP::ECP::Point& p2) const
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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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@ -30,7 +42,7 @@ namespace crypto
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return CryptoPP::ECP::Point {x, y};
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}
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CryptoPP::ECP::Point Mul (const CryptoPP::ECP::Point& p, const CryptoPP::Integer& e)
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CryptoPP::ECP::Point Mul (const CryptoPP::ECP::Point& p, const CryptoPP::Integer& e) const
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{
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CryptoPP::ECP::Point res {0, 1};
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if (!e.IsZero ())
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@ -45,13 +57,13 @@ namespace crypto
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return res;
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}
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bool IsOnCurve (const CryptoPP::ECP::Point& p)
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bool IsOnCurve (const CryptoPP::ECP::Point& p) const
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{
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auto x2 = p.x.Squared(), y2 = p.y.Squared ();
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return (y2 - x2 - CryptoPP::Integer::One() - d*x2*y2).Modulo (q).IsZero ();
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}
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CryptoPP::Integer RecoverX (const CryptoPP::Integer& y)
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CryptoPP::Integer RecoverX (const CryptoPP::Integer& y) const
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{
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auto y2 = y.Squared ();
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auto xx = (y2 - CryptoPP::Integer::One())*(d*y2 + CryptoPP::Integer::One()).InverseMod (q);
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@ -62,7 +74,7 @@ namespace crypto
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return x;
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}
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CryptoPP::ECP::Point DecodePoint (const CryptoPP::Integer& y)
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CryptoPP::ECP::Point DecodePoint (const CryptoPP::Integer& y) const
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{
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auto x = RecoverX (y);
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CryptoPP::ECP::Point p {x, y};
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@ -77,11 +89,31 @@ namespace crypto
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private:
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CryptoPP::Integer q, l, d, I;
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CryptoPP::ECP::Point B; // base point
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};
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static std::unique_ptr<Ed25519> g_Ed25519;
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std::unique_ptr<Ed25519>& GetEd25519 ()
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{
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if (!g_Ed25519)
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g_Ed25519.reset (new Ed25519 ());
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return g_Ed25519;
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}
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EDDSA25519Verifier::EDDSA25519Verifier (const uint8_t * signingKey):
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m_PublicKey (GetEd25519 ()->DecodePublicKey (signingKey))
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{
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}
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bool EDDSA25519Verifier::Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const
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{
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return true; // TODO:
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}
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void EDDSA25519Signer::Sign (CryptoPP::RandomNumberGenerator& rnd, const uint8_t * buf, int len, uint8_t * signature) const
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{
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// TODO
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}
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}
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}
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