AES.rar_AES 加密_AES 解密_C语言AES_C语言加密算法_加密解密实现

#include "stdafx.h" //#include "AESDemo.h" #include "KAES.h" /* #ifdef _DEBUG #undef THIS_FILE static char THIS_FILE[]=__FILE__; #define new DEBUG_NEW #endif */ ////////////////////////////////////////////////////////////////////// // Construction/Destruction ////////////////////////////////////////////////////////////////////// KAES::KAES() { } KAES::~KAES() { } KAES::KAES(int keySize, unsigned char* keyBytes) { SetNbNkNr(keySize);//初始化 memcpy(key,keyBytes,keySize); KeyExpansion(); // expand the seed key into a key schedule and store in w } // Aes constructor void KAES::Cipher(unsigned char* input, unsigned char* output) // encipher 16-bit input { // state = input memset(&State[0][0],0,16); int i; for (i = 0; i < (4 * Nb); i++)// { State[i % 4][ i / 4] = input[i]; } AddRoundKey(0); for (int round = 1; round <= (Nr - 1); round++) // main round loop { SubBytes(); ShiftRows(); MixColumns(); AddRoundKey(round); } // main round loop SubBytes(); ShiftRows(); AddRoundKey(Nr); // output = state for (i = 0; i < (4 * Nb); i++) { output[i] = State[i % 4][ i / 4]; } } // Cipher() KAES::InvCipher(unsigned char * input, unsigned char * output) // decipher 16-bit input { // state = input int i; memset(&State[0][0],0,16); for (i = 0; i < (4 * Nb); i++) { State[i % 4][ i / 4] = input[i]; } AddRoundKey(Nr); for (int round = Nr-1; round >= 1; round--) // main round loop { InvShiftRows(); InvSubBytes(); AddRoundKey(round); InvMixColumns(); } // end main round loop for InvCipher InvShiftRows(); InvSubBytes(); AddRoundKey(0); // output = state for (i = 0; i < (4 * Nb); i++) { output[i] = State[i % 4][ i / 4]; } } // InvCipher() KAES::SetNbNkNr(int keyS) { Nb = 4; // block size always = 4 words = 16 bytes = 128 bits for AES Nk = 4; if (keyS == Bits128) { Nk = 4; // key size = 4 words = 16 bytes = 128 bits Nr = 10; // rounds for algorithm = 10 } else if (keyS == Bits192) { Nk = 6; // 6 words = 24 bytes = 192 bits Nr = 12; } else if (keyS == Bits256) { Nk = 8; // 8 words = 32 bytes = 256 bits Nr = 14; } } // SetNbNkNr() KAES::AddRoundKey(int round) { int r,c; for (r = 0; r < 4; r++) { for (c = 0; c < 4; c++) {//w: 4*x+y State[r][c]=(unsigned char)((int)State[r][c]^(int)w[4*((round*4)+c)+r]); } } } // AddRoundKey() KAES::SubBytes() { int r,c; for (r = 0; r < 4; r++) { for (c = 0; c < 4; c++) { State[r][c] = Sbox[ 16*(State[r][c] >> 4)+ ( State[r][c] & 0x0f) ]; } } } // SubBytes KAES::InvSubBytes() { int r,c; for (r = 0; r < 4; r++) { for (c = 0; c < 4; c++) { State[r][c] = iSbox[ 16*( State[r][c] >> 4)+( State[r][c] & 0x0f) ]; } } } // InvSubBytes KAES::ShiftRows() { unsigned char temp[4*4]; int r,c; for (r = 0; r < 4; r++) // copy State into temp[] { for (c = 0; c < 4; c++) { temp[4*r+c] = State[r][c]; } } //?? for (r = 1; r < 4; r++) // shift temp into State { for (c = 0; c < 4; c++) { State[r][c] = temp[ 4*r+ (c + r) % Nb ]; } } } // ShiftRows() KAES::InvShiftRows() { unsigned char temp[4*4]; int r,c; for (r = 0; r < 4; r++) // copy State into temp[] { for (c = 0; c < 4; c++) { temp[4*r+c] = State[r][c]; } } for (r = 1; r < 4; r++) // shift temp into State { for (c = 0; c < 4; c++) { State[r][ (c + r) % Nb ] = temp[4*r+c]; } } } // InvShiftRows() KAES::MixColumns() { unsigned char temp[4*4]; int r,c; for (r = 0; r < 4; r++) // copy State into temp[] { for (c = 0; c < 4; c++) { temp[4*r+c] = State[r][c]; } } for (c = 0; c < 4; c++) { State[0][c] = (unsigned char) ( (int)gfmultby02(temp[0+c]) ^ (int)gfmultby03(temp[4*1+c]) ^ (int)gfmultby01(temp[4*2+c]) ^ (int)gfmultby01(temp[4*3+c]) ); State[1][c] = (unsigned char) ( (int)gfmultby01(temp[0+c]) ^ (int)gfmultby02(temp[4*1+c]) ^ (int)gfmultby03(temp[4*2+c]) ^ (int)gfmultby01(temp[4*3+c]) ); State[2][c] = (unsigned char) ( (int)gfmultby01(temp[0+c]) ^ (int)gfmultby01(temp[4*1+c]) ^ (int)gfmultby02(temp[4*2+c]) ^ (int)gfmultby03(temp[4*3+c]) ); State[3][c] = (unsigned char) ( (int)gfmultby03(temp[0+c]) ^ (int)gfmultby01(temp[4*1+c]) ^ (int)gfmultby01(temp[4*2+c]) ^ (int)gfmultby02(temp[4*3+c]) ); } } // MixColumns KAES::InvMixColumns() { unsigned char temp[4*4]; int r,c; for (r = 0; r < 4; r++) // copy State into temp[] { for (c = 0; c < 4; c++) { temp[4*r+c] = State[r][c]; } } for (c = 0; c < 4; c++) { State[0][c] = (unsigned char) ( (int)gfmultby0e(temp[c]) ^ (int)gfmultby0b(temp[4+c]) ^ (int)gfmultby0d(temp[4*2+c]) ^ (int)gfmultby09(temp[4*3+c]) ); State[1][c] = (unsigned char) ( (int)gfmultby09(temp[c]) ^ (int)gfmultby0e(temp[4+c]) ^ (int)gfmultby0b(temp[4*2+c]) ^ (int)gfmultby0d(temp[4*3+c]) ); State[2][c] = (unsigned char) ( (int)gfmultby0d(temp[c]) ^ (int)gfmultby09(temp[4+c]) ^ (int)gfmultby0e(temp[4*2+c]) ^ (int)gfmultby0b(temp[4*3+c]) ); State[3][c] = (unsigned char) ( (int)gfmultby0b(temp[c]) ^ (int)gfmultby0d(temp[4+c]) ^ (int)gfmultby09(temp[4*2+c]) ^ (int)gfmultby0e(temp[4*3+c]) ); } } // InvMixColumns unsigned char KAES::gfmultby01(unsigned char b) { return b; } unsigned char KAES::gfmultby02(unsigned char b) { if (b < 0x80) return (unsigned char)(int)(b <<1); else return (unsigned char)( (int)(b << 1) ^ (int)(0x1b) ); } unsigned char KAES::gfmultby03(unsigned char b) { return (unsigned char) ( (int)gfmultby02(b) ^ (int)b ); } unsigned char KAES::gfmultby09(unsigned char b) { return (unsigned char)( (int)gfmultby02(gfmultby02(gfmultby02(b))) ^ (int)b ); } unsigned char KAES::gfmultby0b(unsigned char b) { return (unsigned char)( (int)gfmultby02(gfmultby02(gfmultby02(b))) ^ (int)gfmultby02(b) ^ (int)b ); } unsigned char KAES::gfmultby0d(unsigned char b) { return (unsigned char)( (int)gfmultby02(gfmultby02(gfmultby02(b))) ^ (int)gfmultby02(gfmultby02(b)) ^ (int)(b) ); } unsigned char KAES::gfmultby0e(unsigned char b) { return (unsigned char)( (int)gfmultby02(gfmultby02(gfmultby02(b))) ^ (int)gfmultby02(gfmultby02(b)) ^ (int)gfmultby02(b) ); } KAES::KeyExpansion() { unsigned char result[4],result2[4]; memset(w,0,16*15); int row; for (row = 0; row < Nk; row++)//Nk=4,6,8 { w[4*row+0] = key[4*row]; w[4*row+1] = key[4*row+1]; w[4*row+2] = key[4*row+2]; w[4*row+3] = key[4*row+3]; } unsigned char temp[4]; for (row = Nk; row < Nb * (Nr+1); row++) { temp[0] = w[4*(row-1)+0]; temp[1] = w[4*(row-1)+1]; temp[2] = w[4*(row-1)+2]; temp[3] = w[4*(row-1)+3]; if (row % Nk == 0) { RotWord(temp,result); SubWord(result,result2); memcpy(temp,result2,4);// //RotWord 例程非常简单，它接受 4 字节的数组并将它们向左旋转位移 1 位。 //因为轮回次序表 w[] 有四列，所以 RotWord 会将一行 w[] 向左旋转位移. //SubWord 例程使用置换表 Sbox，针对密钥次序表 w[] 的给定行执行逐字节置换。 temp[0] = (byte)( (int)temp[0] ^ (int) Rcon[4*(row/Nk)+0] ); temp[1] = (byte)( (int)temp[1] ^ (int) Rcon[4*(row/Nk)+1] ); temp[2] = (byte)( (int)temp[2] ^ (int) Rcon[4*(row/Nk)+2] ); temp[3] = (byte)( (int)temp[3] ^ (int) Rcon[4*(row/Nk)+3] ); } else if ( Nk > 6 && (row % Nk == 4) ) { SubWord(temp,result); memcpy(temp,result,4); } // w[row] = w[row-Nk] xor temp w[4*row+0] = (byte