rijndael.hpp

来自「7Zip软件实现： 七种编码格式的压缩与解压缩功能。」· HPP 代码 · 共 38 行

#ifndef _RIJNDAEL_H_
#define _RIJNDAEL_H_

/**************************************************************************
 * This code is based on Szymon Stefanek AES implementation:              *
 * http://www.esat.kuleuven.ac.be/~rijmen/rijndael/rijndael-cpplib.tar.gz *
 *                                                                        *
 * Dynamic tables generation is based on the Brian Gladman's work:        *
 * http://fp.gladman.plus.com/cryptography_technology/rijndael            *
 **************************************************************************/

#define _MAX_KEY_COLUMNS (256/32)
#define _MAX_ROUNDS      14
#define MAX_IV_SIZE      16

class Rijndael
{	
  public:
    enum Direction { Encrypt , Decrypt };
  private:
    void keySched(byte key[_MAX_KEY_COLUMNS][4]);
    void keyEncToDec();
    void encrypt(const byte a[16], byte b[16]);
    void decrypt(const byte a[16], byte b[16]);
    void GenerateTables();

    Direction m_direction;
    byte     m_initVector[MAX_IV_SIZE];
    byte     m_expandedKey[_MAX_ROUNDS+1][4][4];
  public:
    Rijndael();
    void init(Direction dir,const byte *key,byte *initVector);
    int blockEncrypt(const byte *input, int inputLen, byte *outBuffer);
    int blockDecrypt(const byte *input, int inputLen, byte *outBuffer);
};
	
#endif // _RIJNDAEL_H_