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//Rijndael.h
#ifndef __RIJNDAEL_H__
#define __RIJNDAEL_H__
//Rijndael (pronounced Reindaal) is a block cipher, designed by Joan Daemen and Vincent Rijmen as a candidate algorithm for the AES.
//The cipher has a variable block length and key length. The authors currently specify how to use keys with a length
//of 128, 192, or 256 bits to encrypt blocks with al length of 128, 192 or 256 bits (all nine combinations of
//key length and block length are possible). Both block length and key length can be extended very easily to
// multiples of 32 bits.
//Rijndael can be implemented very efficiently on a wide range of processors and in hardware.
//This implementation is based on the Java Implementation used with the Cryptix toolkit found at:
//http://www.esat.kuleuven.ac.be/~rijmen/rijndael/rijndael.zip
//Java code authors: Raif S. Naffah, Paulo S. L. M. Barreto
//This Implementation was tested against KAT test published by the authors of the method and the
//results were identical.
class CRijndael
{
private:
enum { DEFAULT_BLOCK_SIZE=16 };
enum { MAX_BLOCK_SIZE=32, MAX_ROUNDS=14, MAX_KC=8, MAX_BC=8 };
public:
//CONSTRUCTOR
CRijndael();
//DESTRUCTOR
virtual ~CRijndael();
//Expand a user-supplied key material into a session key.
// key - The 128/192/256-bit user-key to use.
// chain - initial chain block
// keylength - 16, 24 or 32 bytes
// blockSize - The block size in bytes of this Rijndael (16, 24 or 32 bytes).
int MakeKey(char const* key, char const* chain, int keylength, int blockSize);
private:
//Auxiliary Function
void Xor(char* buff, char const* chain)
{
for (int i = 0; i < m_blockSize; i++)
*(buff++) ^= *(chain++);
}
//Convenience method to encrypt exactly one block of plaintext, assuming
//Rijndael's default block size (128-bit).
// in - The plaintext
// result - The ciphertext generated from a plaintext using the key
void DefEncryptBlock(char const* in, char* result);
//Convenience method to decrypt exactly one block of plaintext, assuming
//Rijndael's default block size (128-bit).
// in - The ciphertext.
// result - The plaintext generated from a ciphertext using the session key.
void DefDecryptBlock(char const* in, char* result);
public:
//Encrypt exactly one block of plaintext.
// in - The plaintext.
// result - The ciphertext generated from a plaintext using the key.
void EncryptBlock(char const* in, char* result);
//Decrypt exactly one block of ciphertext.
// in - The ciphertext.
// result - The plaintext generated from a ciphertext using the session key.
void DecryptBlock(char const* in, char* result);
int Encrypt(char const* in, char* result, size_t n);
int Decrypt(char const* in, char* result, size_t n);
//Get Key Length
int GetKeyLength()
{
return m_keylength;
}
//Block Size
int GetBlockSize()
{
return m_blockSize;
}
//Number of Rounds
int GetRounds()
{
return m_iROUNDS;
}
void ResetChain()
{
memcpy(m_chain, m_chain0, m_blockSize);
}
public:
//Null chain
static char const* sm_chain0;
private:
//Key Initialization Flag
bool m_bKeyInit;
//Encryption (m_Ke) round key
int m_Ke[MAX_ROUNDS + 1][MAX_BC];
//Decryption (m_Kd) round key
int m_Kd[MAX_ROUNDS + 1][MAX_BC];
//Key Length
int m_keylength;
//Block Size
int m_blockSize;
//Number of Rounds
int m_iROUNDS;
//Chain Block
char m_chain0[MAX_BLOCK_SIZE];
char m_chain[MAX_BLOCK_SIZE];
//Auxiliary private use buffers
int tk[MAX_KC];
int a[MAX_BC];
int t[MAX_BC];
};
#endif // __RIJNDAEL_H__
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