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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
*/
#include <string.h>
#include "Log.h"
#include "Gost.h"
#include "CryptoKey.h"
namespace i2p
{
namespace crypto
{
ElGamalEncryptor::ElGamalEncryptor (const uint8_t * pub)
{
memcpy (m_PublicKey, pub, 256);
}
void ElGamalEncryptor::Encrypt (const uint8_t * data, uint8_t * encrypted)
{
ElGamalEncrypt (m_PublicKey, data, encrypted);
}
ElGamalDecryptor::ElGamalDecryptor (const uint8_t * priv)
{
memcpy (m_PrivateKey, priv, 256);
}
bool ElGamalDecryptor::Decrypt (const uint8_t * encrypted, uint8_t * data)
{
return ElGamalDecrypt (m_PrivateKey, encrypted, data);
}
ECIESP256Encryptor::ECIESP256Encryptor (const uint8_t * pub)
{
m_Curve = EC_GROUP_new_by_curve_name (NID_X9_62_prime256v1);
m_PublicKey = EC_POINT_new (m_Curve);
BIGNUM * x = BN_bin2bn (pub, 32, nullptr);
BIGNUM * y = BN_bin2bn (pub + 32, 32, nullptr);
if (!EC_POINT_set_affine_coordinates (m_Curve, m_PublicKey, x, y, nullptr))
LogPrint (eLogError, "ECICS P256 invalid public key");
BN_free (x); BN_free (y);
}
ECIESP256Encryptor::~ECIESP256Encryptor ()
{
if (m_Curve) EC_GROUP_free (m_Curve);
if (m_PublicKey) EC_POINT_free (m_PublicKey);
}
void ECIESP256Encryptor::Encrypt (const uint8_t * data, uint8_t * encrypted)
{
if (m_Curve && m_PublicKey)
ECIESEncrypt (m_Curve, m_PublicKey, data, encrypted);
}
ECIESP256Decryptor::ECIESP256Decryptor (const uint8_t * priv)
{
m_Curve = EC_GROUP_new_by_curve_name (NID_X9_62_prime256v1);
m_PrivateKey = BN_bin2bn (priv, 32, nullptr);
}
ECIESP256Decryptor::~ECIESP256Decryptor ()
{
if (m_Curve) EC_GROUP_free (m_Curve);
if (m_PrivateKey) BN_free (m_PrivateKey);
}
bool ECIESP256Decryptor::Decrypt (const uint8_t * encrypted, uint8_t * data)
{
if (m_Curve && m_PrivateKey)
return ECIESDecrypt (m_Curve, m_PrivateKey, encrypted, data);
return false;
}
void CreateECIESP256RandomKeys (uint8_t * priv, uint8_t * pub)
{
EC_GROUP * curve = EC_GROUP_new_by_curve_name (NID_X9_62_prime256v1);
EC_POINT * p = nullptr;
BIGNUM * key = nullptr;
GenerateECIESKeyPair (curve, key, p);
bn2buf (key, priv, 32);
RAND_bytes (priv + 32, 224);
BN_free (key);
BIGNUM * x = BN_new (), * y = BN_new ();
EC_POINT_get_affine_coordinates (curve, p, x, y, NULL);
bn2buf (x, pub, 32);
bn2buf (y, pub + 32, 32);
RAND_bytes (pub + 64, 192);
EC_POINT_free (p);
BN_free (x); BN_free (y);
EC_GROUP_free (curve);
}
ECIESGOSTR3410Encryptor::ECIESGOSTR3410Encryptor (const uint8_t * pub)
{
auto& curve = GetGOSTR3410Curve (eGOSTR3410CryptoProA);
m_PublicKey = EC_POINT_new (curve->GetGroup ());
BIGNUM * x = BN_bin2bn (pub, 32, nullptr);
BIGNUM * y = BN_bin2bn (pub + 32, 32, nullptr);
if (!EC_POINT_set_affine_coordinates (curve->GetGroup (), m_PublicKey, x, y, nullptr))
LogPrint (eLogError, "ECICS GOST R 34.10 invalid public key");
BN_free (x); BN_free (y);
}
ECIESGOSTR3410Encryptor::~ECIESGOSTR3410Encryptor ()
{
if (m_PublicKey) EC_POINT_free (m_PublicKey);
}
void ECIESGOSTR3410Encryptor::Encrypt (const uint8_t * data, uint8_t * encrypted)
{
if (m_PublicKey)
ECIESEncrypt (GetGOSTR3410Curve (eGOSTR3410CryptoProA)->GetGroup (), m_PublicKey, data, encrypted);
}
ECIESGOSTR3410Decryptor::ECIESGOSTR3410Decryptor (const uint8_t * priv)
{
m_PrivateKey = BN_bin2bn (priv, 32, nullptr);
}
ECIESGOSTR3410Decryptor::~ECIESGOSTR3410Decryptor ()
{
if (m_PrivateKey) BN_free (m_PrivateKey);
}
bool ECIESGOSTR3410Decryptor::Decrypt (const uint8_t * encrypted, uint8_t * data)
{
if (m_PrivateKey)
return ECIESDecrypt (GetGOSTR3410Curve (eGOSTR3410CryptoProA)->GetGroup (), m_PrivateKey, encrypted, data);
return false;
}
void CreateECIESGOSTR3410RandomKeys (uint8_t * priv, uint8_t * pub)
{
auto& curve = GetGOSTR3410Curve (eGOSTR3410CryptoProA);
EC_POINT * p = nullptr;
BIGNUM * key = nullptr;
GenerateECIESKeyPair (curve->GetGroup (), key, p);
bn2buf (key, priv, 32);
RAND_bytes (priv + 32, 224);
BN_free (key);
BIGNUM * x = BN_new (), * y = BN_new ();
EC_POINT_get_affine_coordinates (curve->GetGroup (), p, x, y, NULL);
bn2buf (x, pub, 32);
bn2buf (y, pub + 32, 32);
RAND_bytes (pub + 64, 192);
EC_POINT_free (p);
BN_free (x); BN_free (y);
}
ECIESX25519AEADRatchetEncryptor::ECIESX25519AEADRatchetEncryptor (const uint8_t * pub)
{
memcpy (m_PublicKey, pub, 32);
}
void ECIESX25519AEADRatchetEncryptor::Encrypt (const uint8_t *, uint8_t * pub)
{
memcpy (pub, m_PublicKey, 32);
}
ECIESX25519AEADRatchetDecryptor::ECIESX25519AEADRatchetDecryptor (const uint8_t * priv, bool calculatePublic)
{
m_StaticKeys.SetPrivateKey (priv, calculatePublic);
}
bool ECIESX25519AEADRatchetDecryptor::Decrypt (const uint8_t * epub, uint8_t * sharedSecret)
{
return m_StaticKeys.Agree (epub, sharedSecret);
}
void CreateECIESX25519AEADRatchetRandomKeys (uint8_t * priv, uint8_t * pub)
{
X25519Keys k;
k.GenerateKeys ();
k.GetPrivateKey (priv);
memcpy (pub, k.GetPublicKey (), 32);
}
LocalEncryptionKey::LocalEncryptionKey (i2p::data::CryptoKeyType t): keyType(t)
{
pub.resize (GetCryptoPublicKeyLen (keyType));
priv.resize (GetCryptoPrivateKeyLen (keyType));
}
void LocalEncryptionKey::GenerateKeys ()
{
i2p::data::PrivateKeys::GenerateCryptoKeyPair (keyType, priv.data (), pub.data ());
}
void LocalEncryptionKey::CreateDecryptor ()
{
decryptor = i2p::data::PrivateKeys::CreateDecryptor (keyType, priv.data ());
}
}
}
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