aes.h

AES加密算法用C语言实现

//enum KeySize { Bits128, Bits192, Bits256 };  // key size, in bits, for construtor
#define Bits128	0
#define Bits192	1
#define Bits256	2

class Aes  // Advanced Encryption Standard
{
public:
	~Aes();
	//Aes();
	Aes(int keySize, char* keyBytes);
private:
	int Nb;         // block size in 32-bit words.  Always 4 for AES.  (128 bits).
	int Nk;         // key size in 32-bit words.  4, 6, 8.  (128, 192, 256 bits).
	int Nr;         // number of rounds. 10, 12, 14.

	char* key;     // the seed key. size will be 4 * keySize from ctor.
	char* Sbox;   // Substitution box
	char* iSbox;  // inverse Substitution box 
	char* w;      // key schedule array. 
	char* Rcon;   // Round constants.
	char* State;  // State matrix
	void Cipher(char* input, char* output);  // encipher 16-bit input
	InvCipher(char* input, char* output);  // decipher 16-bit input
	SetNbNkNr(int keyS);
	BuildSbox();
	BuildInvSbox();
	BuildRcon();
	AddRoundKey(int round);
	SubBytes();
	InvSubBytes();
	ShiftRows();
	InvShiftRows();
	MixColumns();
	InvMixColumns();
	gfmultby01(char b);
	gfmultby02(char b);
	gfmultby03(char b);
	gfmultby09(char b);
	gfmultby0b(char b);
	gfmultby0d(char b);
	gfmultby0e(char b);
	KeyExpansion();
	SubWord(char* word);
	RotWord(char* word);
	Dump();
	DumpKey();
	DumpTwoByTwo(char* a);
}