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crypto key encryptor and decryptor

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orignal 2017-11-06 15:54:18 -05:00
parent 88ba494701
commit 9fa67b0e0a
2 changed files with 144 additions and 0 deletions
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75
libi2pd/CryptoKey.cpp
View file

@ -1,9 +1,84 @@
#include <string.h>
#include "Log.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)
{
BN_CTX * ctx = BN_CTX_new ();
ElGamalEncrypt (m_PublicKey, data, encrypted, ctx, true);
BN_CTX_free (ctx);
}
ElGamalDecryptor::ElGamalDecryptor (const uint8_t * priv)
{
memcpy (m_PrivateKey, priv, 256);
}
void ElGamalDecryptor::Decrypt (const uint8_t * encrypted, uint8_t * data)
{
BN_CTX * ctx = BN_CTX_new ();
ElGamalDecrypt (m_PrivateKey, encrypted, data, ctx, true);
BN_CTX_free (ctx);
}
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_GFp (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)
{
BN_CTX * ctx = BN_CTX_new ();
ECIESEncrypt (m_Curve, m_PublicKey, data, encrypted, ctx);
BN_CTX_free (ctx);
}
}
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);
}
void ECIESP256Decryptor::Decrypt (const uint8_t * encrypted, uint8_t * data)
{
if (m_Curve && m_PrivateKey)
{
BN_CTX * ctx = BN_CTX_new ();
ECIESDecrypt (m_Curve, m_PrivateKey, encrypted, data, ctx);
BN_CTX_free (ctx);
}
}
void CreateECIESP256RandomKeys (uint8_t * priv, uint8_t * pub)
{
EC_GROUP * curve = EC_GROUP_new_by_curve_name (NID_X9_62_prime256v1);

69
libi2pd/CryptoKey.h
View file

@ -8,6 +8,75 @@ namespace i2p
{
namespace crypto
{
class CryptoKeyEncryptor
{
public:
virtual ~CryptoKeyEncryptor () {};
virtual void Encrypt (const uint8_t * data, uint8_t * encrypted); // 222 bytes data, 512 bytes encrypted
};
class CryptoKeyDecryptor
{
public:
virtual ~CryptoKeyDecryptor () {};
virtual void Decrypt (const uint8_t * encrypted, uint8_t * data); // 512 bytes encrypted, 222 bytes data
};
class ElGamalEncryptor // for destination
{
public:
ElGamalEncryptor (const uint8_t * pub);
void Encrypt (const uint8_t * data, uint8_t * encrypted);
private:
uint8_t m_PublicKey[256];
};
class ElGamalDecryptor // for destination
{
public:
ElGamalDecryptor (const uint8_t * priv);
void Decrypt (const uint8_t * encrypted, uint8_t * data);
private:
uint8_t m_PrivateKey[256];
};
class ECIESP256Encryptor
{
public:
ECIESP256Encryptor (const uint8_t * pub);
~ECIESP256Encryptor ();
void Encrypt (const uint8_t * data, uint8_t * encrypted);
private:
EC_GROUP * m_Curve;
EC_POINT * m_PublicKey;
};
class ECIESP256Decryptor
{
public:
ECIESP256Decryptor (const uint8_t * priv);
~ECIESP256Decryptor ();
void Decrypt (const uint8_t * encrypted, uint8_t * data);
private:
EC_GROUP * m_Curve;
BIGNUM * m_PrivateKey;
};
void CreateECIESP256RandomKeys (uint8_t * priv, uint8_t * pub);
}
}