aescodec.h

AES加密解密

#pragma once

typedef unsigned long AES_WORD;
typedef unsigned char AES_BYTE;
typedef AES_BYTE * AES_STATE;

#define AESG28T 0x1b; /* 00011011 用于G28运算 */

 /* 为了提高速度，使用宏操作而不使用函数操作 */
#define AESG2B0X02(A) ((A & 0x80) ? ((A << 1) ^ 0x1b): (A << 1))   //0x02 * A
#define AESG2B0X03(A) (((A & 0x80) ? ((A << 1) ^ 0x1b): (A << 1)) ^ A)   //0x03 * A
#define AESG28CHCEK(A, B) (((A ^ B) & 0x80) ? 0x01b : 0)//(((A ^ B) >> 7) * 0x1b)   //check

#define RotWord(a) (((a >> 24) & 0xff) | ((a << 8) & 0xffffff00L)) 
                      
# define SWAP(x) ((x << 8) & 0x00ff00ff | (x >> 8) & 0xff00ff00)
# define GETU32(p) SWAP(((unsigned long *)(p)))


class AesCodec
{
public:
	AesCodec(void);
	~AesCodec(void);

	// 用于SubBytes的S-box，为了加快运算速度，转换为一维表达
	AES_BYTE *m_AES_S_box;

	// 用于InvSubBytes的S-box，为了加快运算速度，转换为一维表达
	AES_BYTE *m_AES_InvS_box;

	// 用于MixColumns的矩阵，为了加快运算速度，转换为一维表达
	AES_BYTE *m_AES_Mix_poly;

	// 用于InvMixColumns的矩阵，为了加快运算速度，转换为一维表达
	AES_BYTE *m_AES_InvMix_poly;

	// 用于KeyExpansion的Rocn表
	AES_WORD *m_AES_Rocn;


	void AddRoundKey(AES_STATE state, AES_WORD * w);
	void SubBytes(AES_STATE state);
	void InvSubBytes(AES_STATE state);
	void ShiftRow(AES_STATE state);
	void InvShiftRow(AES_STATE state);
	void MixColumns(AES_STATE state);
	void InvMixColumns(AES_STATE state);
	AES_BYTE AesGF28(AES_BYTE s1, AES_BYTE s2);
	void KeyExpansion(AES_BYTE * key, AES_WORD * w);
	AES_WORD SubWord(AES_WORD w);
	void Cipher(AES_STATE state, AES_WORD * w);
	void InvCipher(AES_STATE state, AES_WORD * w);
	AES_BYTE GF2809(AES_BYTE B);
	AES_BYTE GF280B(AES_BYTE B);
	AES_BYTE GF280D(AES_BYTE B);
	AES_BYTE GF280E(AES_BYTE B);
};