i2pd/aes.h
2014-11-01 21:53:45 -04:00

192 lines
3.8 KiB
C++

#ifndef AES_H__
#define AES_H__
#include <inttypes.h>
#include <cryptopp/modes.h>
#include <cryptopp/aes.h>
#include "Identity.h"
namespace i2p
{
namespace crypto
{
union ChipherBlock
{
uint8_t buf[16];
uint64_t ll[2];
void operator^=(const ChipherBlock& other) // XOR
{
ll[0] ^= other.ll[0];
ll[1] ^= other.ll[1];
}
};
typedef i2p::data::Tag<32> AESKey;
#ifdef AESNI
class ECBCryptoAESNI
{
public:
ECBCryptoAESNI ();
uint8_t * GetKeySchedule () { return m_KeySchedule; };
protected:
void ExpandKey (const AESKey& key);
protected:
uint8_t * m_KeySchedule; // start of 16 bytes boundary of m_UnalignedBuffer
uint8_t m_UnalignedBuffer[256]; // 14 rounds for AES-256, 240 + 16 bytes
};
class ECBEncryptionAESNI: public ECBCryptoAESNI
{
public:
void SetKey (const AESKey& key) { ExpandKey (key); };
void Encrypt (const ChipherBlock * in, ChipherBlock * out);
};
class ECBDecryptionAESNI: public ECBCryptoAESNI
{
public:
void SetKey (const AESKey& key);
void Decrypt (const ChipherBlock * in, ChipherBlock * out);
};
typedef ECBEncryptionAESNI ECBEncryption;
typedef ECBDecryptionAESNI ECBDecryption;
#else // use crypto++
class ECBEncryption
{
public:
void SetKey (const AESKey& key)
{
m_Encryption.SetKey (key, 32);
}
void Encrypt (const ChipherBlock * in, ChipherBlock * out)
{
m_Encryption.ProcessData (out->buf, in->buf, 16);
}
private:
CryptoPP::ECB_Mode<CryptoPP::AES>::Encryption m_Encryption;
};
class ECBDecryption
{
public:
void SetKey (const AESKey& key)
{
m_Decryption.SetKey (key, 32);
}
void Decrypt (const ChipherBlock * in, ChipherBlock * out)
{
m_Decryption.ProcessData (out->buf, in->buf, 16);
}
private:
CryptoPP::ECB_Mode<CryptoPP::AES>::Decryption m_Decryption;
};
#endif
class CBCEncryption
{
public:
CBCEncryption () { memset (m_LastBlock.buf, 0, 16); };
void SetKey (const AESKey& key) { m_ECBEncryption.SetKey (key); }; // 32 bytes
void SetIV (const uint8_t * iv) { memcpy (m_LastBlock.buf, iv, 16); }; // 16 bytes
void Encrypt (int numBlocks, const ChipherBlock * in, ChipherBlock * out);
void Encrypt (const uint8_t * in, std::size_t len, uint8_t * out);
void Encrypt (const uint8_t * in, uint8_t * out); // one block
private:
ChipherBlock m_LastBlock;
ECBEncryption m_ECBEncryption;
};
class CBCDecryption
{
public:
CBCDecryption () { memset (m_IV.buf, 0, 16); };
void SetKey (const AESKey& key) { m_ECBDecryption.SetKey (key); }; // 32 bytes
void SetIV (const uint8_t * iv) { memcpy (m_IV.buf, iv, 16); }; // 16 bytes
void Decrypt (int numBlocks, const ChipherBlock * in, ChipherBlock * out);
void Decrypt (const uint8_t * in, std::size_t len, uint8_t * out);
void Decrypt (const uint8_t * in, uint8_t * out); // one block
private:
ChipherBlock m_IV;
ECBDecryption m_ECBDecryption;
};
class TunnelEncryption // with double IV encryption
{
public:
void SetKeys (const AESKey& layerKey, const AESKey& ivKey)
{
m_LayerEncryption.SetKey (layerKey);
m_IVEncryption.SetKey (ivKey);
}
void Encrypt (uint8_t * payload); // 1024 bytes (16 IV + 1008 data)
private:
ECBEncryption m_IVEncryption;
#ifdef AESNI
ECBEncryption m_LayerEncryption;
#else
CBCEncryption m_LayerEncryption;
#endif
};
class TunnelDecryption // with double IV encryption
{
public:
void SetKeys (const AESKey& layerKey, const AESKey& ivKey)
{
m_LayerDecryption.SetKey (layerKey);
m_IVDecryption.SetKey (ivKey);
}
void Decrypt (uint8_t * payload); // 1024 bytes (16 IV + 1008 data)
private:
ECBDecryption m_IVDecryption;
#ifdef AESNI
ECBDecryption m_LayerDecryption;
#else
CBCDecryption m_LayerDecryption;
#endif
};
}
}
#endif