I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#ifndef SIGNATURE_H__
#define SIGNATURE_H__
#include <inttypes.h>
#include <cryptopp/dsa.h>
#include <cryptopp/asn.h>
#include <cryptopp/oids.h>
#include <cryptopp/osrng.h>
#include <cryptopp/eccrypto.h>
#include "CryptoConst.h"
namespace i2p
{
namespace crypto
{
class Verifier
{
public:
virtual ~Verifier () {};
virtual bool Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const = 0;
virtual size_t GetPublicKeyLen () const = 0;
virtual size_t GetSignatureLen () const = 0;
};
class Signer
{
public:
virtual ~Signer () {};
virtual void Sign (CryptoPP::RandomNumberGenerator& rnd, const uint8_t * buf, int len, uint8_t * signature) const = 0;
};
class DSAVerifier: public Verifier
{
public:
DSAVerifier (const uint8_t * signingKey)
{
m_PublicKey.Initialize (dsap, dsaq, dsag, CryptoPP::Integer (signingKey, 128));
}
bool Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const
{
CryptoPP::DSA::Verifier verifier (m_PublicKey);
return verifier.VerifyMessage (buf, len, signature, 40);
}
size_t GetPublicKeyLen () const { return 128; };
size_t GetSignatureLen () const { return 40; };
private:
CryptoPP::DSA::PublicKey m_PublicKey;
};
class DSASigner: public Signer
{
public:
DSASigner (const uint8_t * signingPrivateKey)
{
m_PrivateKey.Initialize (dsap, dsaq, dsag, CryptoPP::Integer (signingPrivateKey, 20));
}
void Sign (CryptoPP::RandomNumberGenerator& rnd, const uint8_t * buf, int len, uint8_t * signature) const
{
CryptoPP::DSA::Signer signer (m_PrivateKey);
signer.SignMessage (rnd, buf, len, signature);
}
private:
CryptoPP::DSA::PrivateKey m_PrivateKey;
};
inline void CreateDSARandomKeys (CryptoPP::RandomNumberGenerator& rnd, uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
{
CryptoPP::DSA::PrivateKey privateKey;
CryptoPP::DSA::PublicKey publicKey;
privateKey.Initialize (rnd, dsap, dsaq, dsag);
privateKey.MakePublicKey (publicKey);
privateKey.GetPrivateExponent ().Encode (signingPrivateKey, 20);
publicKey.GetPublicElement ().Encode (signingPublicKey, 128);
}
class ECDSAP256Verifier: public Verifier
{
public:
ECDSAP256Verifier (const uint8_t * signingKey)
{
m_PublicKey.Initialize (CryptoPP::ASN1::secp256r1(),
CryptoPP::ECP::Point (CryptoPP::Integer (signingKey, 32),
CryptoPP::Integer (signingKey + 32, 32)));
}
bool Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const
{
CryptoPP::ECDSA<CryptoPP::ECP, CryptoPP::SHA256>::Verifier verifier (m_PublicKey);
return verifier.VerifyMessage (buf, len, signature, 64);
}
size_t GetPublicKeyLen () const { return 64; };
size_t GetSignatureLen () const { return 64; };
private:
CryptoPP::ECDSA<CryptoPP::ECP, CryptoPP::SHA256>::PublicKey m_PublicKey;
};
class ECDSAP256Signer: public Signer
{
public:
ECDSAP256Signer (const uint8_t * signingPrivateKey)
{
m_PrivateKey.Initialize (CryptoPP::ASN1::secp256r1(), CryptoPP::Integer (signingPrivateKey, 32));
}
void Sign (CryptoPP::RandomNumberGenerator& rnd, const uint8_t * buf, int len, uint8_t * signature) const
{
CryptoPP::ECDSA<CryptoPP::ECP, CryptoPP::SHA256>::Signer signer (m_PrivateKey);
signer.SignMessage (rnd, buf, len, signature);
}
private:
CryptoPP::ECDSA<CryptoPP::ECP, CryptoPP::SHA256>::PrivateKey m_PrivateKey;
};
inline void CreateECDSAP256RandomKeys (CryptoPP::RandomNumberGenerator& rnd, uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
{
CryptoPP::ECDSA<CryptoPP::ECP, CryptoPP::SHA256>::PrivateKey privateKey;
CryptoPP::ECDSA<CryptoPP::ECP, CryptoPP::SHA256>::PublicKey publicKey;
privateKey.Initialize (rnd, CryptoPP::ASN1::secp256r1());
privateKey.MakePublicKey (publicKey);
privateKey.GetPrivateExponent ().Encode (signingPrivateKey, 32);
auto q = publicKey.GetPublicElement ();
q.x.Encode (signingPublicKey, 32);
q.y.Encode (signingPublicKey + 32, 32);
}
}
}
#endif