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/*
* Copyright (c) 2013-2025, The PurpleI2P Project
*
* This file is part of Purple i2pd project and licensed under BSD3
*
* See full license text in LICENSE file at top of project tree
*/
#ifndef CRYPTO_KEY_H__
#define CRYPTO_KEY_H__
#include <inttypes.h>
#include "Crypto.h"
#include "Identity.h"
namespace i2p
{
namespace crypto
{
class CryptoKeyEncryptor
{
public:
virtual ~CryptoKeyEncryptor () {};
virtual void Encrypt (const uint8_t * data, uint8_t * encrypted) = 0;
};
class CryptoKeyDecryptor
{
public:
virtual ~CryptoKeyDecryptor () {};
virtual bool Decrypt (const uint8_t * encrypted, uint8_t * data) = 0;
virtual size_t GetPublicKeyLen () const = 0; // we need it to set key in LS2
};
// ElGamal
class ElGamalEncryptor: public CryptoKeyEncryptor // for destination
{
public:
ElGamalEncryptor (const uint8_t * pub);
void Encrypt (const uint8_t * data, uint8_t * encrypted) override; // 222 bytes data, 514 bytes encrypted
private:
uint8_t m_PublicKey[256];
};
class ElGamalDecryptor: public CryptoKeyDecryptor // for destination
{
public:
ElGamalDecryptor (const uint8_t * priv);
bool Decrypt (const uint8_t * encrypted, uint8_t * data) override; // 514 bytes encrypted, 222 bytes data
size_t GetPublicKeyLen () const override { return 256; };
private:
uint8_t m_PrivateKey[256];
};
// ECIES P256
class ECIESP256Encryptor: public CryptoKeyEncryptor
{
public:
ECIESP256Encryptor (const uint8_t * pub);
~ECIESP256Encryptor ();
void Encrypt (const uint8_t * data, uint8_t * encrypted) override;
private:
EC_GROUP * m_Curve;
EC_POINT * m_PublicKey;
};
class ECIESP256Decryptor: public CryptoKeyDecryptor
{
public:
ECIESP256Decryptor (const uint8_t * priv);
~ECIESP256Decryptor ();
bool Decrypt (const uint8_t * encrypted, uint8_t * data) override;
size_t GetPublicKeyLen () const override { return 64; };
private:
EC_GROUP * m_Curve;
BIGNUM * m_PrivateKey;
};
void CreateECIESP256RandomKeys (uint8_t * priv, uint8_t * pub);
// ECIES GOST R 34.10
class ECIESGOSTR3410Encryptor: public CryptoKeyEncryptor
{
public:
ECIESGOSTR3410Encryptor (const uint8_t * pub);
~ECIESGOSTR3410Encryptor ();
void Encrypt (const uint8_t * data, uint8_t * encrypted) override;
private:
EC_POINT * m_PublicKey;
};
class ECIESGOSTR3410Decryptor: public CryptoKeyDecryptor
{
public:
ECIESGOSTR3410Decryptor (const uint8_t * priv);
~ECIESGOSTR3410Decryptor ();
bool Decrypt (const uint8_t * encrypted, uint8_t * data) override;
size_t GetPublicKeyLen () const override { return 64; };
private:
BIGNUM * m_PrivateKey;
};
void CreateECIESGOSTR3410RandomKeys (uint8_t * priv, uint8_t * pub);
// ECIES-X25519-AEAD-Ratchet
class ECIESX25519AEADRatchetEncryptor: public CryptoKeyEncryptor
{
public:
ECIESX25519AEADRatchetEncryptor (const uint8_t * pub);
~ECIESX25519AEADRatchetEncryptor () {};
void Encrypt (const uint8_t *, uint8_t * pub) override;
// copies m_PublicKey to pub
private:
uint8_t m_PublicKey[32];
};
class ECIESX25519AEADRatchetDecryptor: public CryptoKeyDecryptor
{
public:
ECIESX25519AEADRatchetDecryptor (const uint8_t * priv, bool calculatePublic = false);
~ECIESX25519AEADRatchetDecryptor () {};
bool Decrypt (const uint8_t * epub, uint8_t * sharedSecret) override;
// agree with static and return in sharedSecret (32 bytes)
size_t GetPublicKeyLen () const override { return 32; };
const uint8_t * GetPubicKey () const { return m_StaticKeys.GetPublicKey (); };
private:
X25519Keys m_StaticKeys;
};
void CreateECIESX25519AEADRatchetRandomKeys (uint8_t * priv, uint8_t * pub); // including hybrid
constexpr size_t GetCryptoPrivateKeyLen (i2p::data::CryptoKeyType type)
{
switch (type)
{
case i2p::data::CRYPTO_KEY_TYPE_ELGAMAL: return 256;
case i2p::data::CRYPTO_KEY_TYPE_ECIES_P256_SHA256_AES256CBC: return 256; // actual size is 32, but we use 256 for compatibility with old keys files
case i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD: return 32;
// ML-KEM hybrid
case i2p::data::CRYPTO_KEY_TYPE_ECIES_MLKEM512_X25519_AEAD:
case i2p::data::CRYPTO_KEY_TYPE_ECIES_MLKEM768_X25519_AEAD:
case i2p::data::CRYPTO_KEY_TYPE_ECIES_MLKEM1024_X25519_AEAD:
return 32;
};
return 0;
}
constexpr size_t GetCryptoPublicKeyLen (i2p::data::CryptoKeyType type)
{
switch (type)
{
case i2p::data::CRYPTO_KEY_TYPE_ELGAMAL: return 256;
case i2p::data::CRYPTO_KEY_TYPE_ECIES_P256_SHA256_AES256CBC: return 32;
case i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD: return 32;
// ML-KEM hybrid
case i2p::data::CRYPTO_KEY_TYPE_ECIES_MLKEM512_X25519_AEAD:
case i2p::data::CRYPTO_KEY_TYPE_ECIES_MLKEM768_X25519_AEAD:
case i2p::data::CRYPTO_KEY_TYPE_ECIES_MLKEM1024_X25519_AEAD:
return 32;
};
return 0;
}
struct LocalEncryptionKey
{
std::vector<uint8_t> pub, priv;
i2p::data::CryptoKeyType keyType;
std::shared_ptr<CryptoKeyDecryptor> decryptor;
LocalEncryptionKey (i2p::data::CryptoKeyType t);
void GenerateKeys ();
void CreateDecryptor ();
};
}
}
#endif
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