AES.zip

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  • 2021-01-16 15:46
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AES的开源代码,并附有详细注释,适合新人学习
AES.zip
内容介绍
#include "aes.h" unsigned char AES::SBOX[256] = { /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */ 0x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5,0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76, /*0*/ 0xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0,0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0, /*1*/ 0xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc,0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15, /*2*/ 0x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a,0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75, /*3*/ 0x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0,0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84, /*4*/ 0x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b,0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf, /*5*/ 0xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85,0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8, /*6*/ 0x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5,0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2, /*7*/ 0xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17,0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73, /*8*/ 0x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88,0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb, /*9*/ 0xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c,0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79, /*a*/ 0xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9,0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08, /*b*/ 0xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6,0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a, /*c*/ 0x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e,0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e, /*d*/ 0xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94,0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf, /*e*/ 0x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68,0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16 /*f*/ }; unsigned char AES::INVSBOX[256] = { /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */ 0x52,0x09,0x6a,0xd5,0x30,0x36,0xa5,0x38,0xbf,0x40,0xa3,0x9e,0x81,0xf3,0xd7,0xfb, /*0*/ 0x7c,0xe3,0x39,0x82,0x9b,0x2f,0xff,0x87,0x34,0x8e,0x43,0x44,0xc4,0xde,0xe9,0xcb, /*1*/ 0x54,0x7b,0x94,0x32,0xa6,0xc2,0x23,0x3d,0xee,0x4c,0x95,0x0b,0x42,0xfa,0xc3,0x4e, /*2*/ 0x08,0x2e,0xa1,0x66,0x28,0xd9,0x24,0xb2,0x76,0x5b,0xa2,0x49,0x6d,0x8b,0xd1,0x25, /*3*/ 0x72,0xf8,0xf6,0x64,0x86,0x68,0x98,0x16,0xd4,0xa4,0x5c,0xcc,0x5d,0x65,0xb6,0x92, /*4*/ 0x6c,0x70,0x48,0x50,0xfd,0xed,0xb9,0xda,0x5e,0x15,0x46,0x57,0xa7,0x8d,0x9d,0x84, /*5*/ 0x90,0xd8,0xab,0x00,0x8c,0xbc,0xd3,0x0a,0xf7,0xe4,0x58,0x05,0xb8,0xb3,0x45,0x06, /*6*/ 0xd0,0x2c,0x1e,0x8f,0xca,0x3f,0x0f,0x02,0xc1,0xaf,0xbd,0x03,0x01,0x13,0x8a,0x6b, /*7*/ 0x3a,0x91,0x11,0x41,0x4f,0x67,0xdc,0xea,0x97,0xf2,0xcf,0xce,0xf0,0xb4,0xe6,0x73, /*8*/ 0x96,0xac,0x74,0x22,0xe7,0xad,0x35,0x85,0xe2,0xf9,0x37,0xe8,0x1c,0x75,0xdf,0x6e, /*9*/ 0x47,0xf1,0x1a,0x71,0x1d,0x29,0xc5,0x89,0x6f,0xb7,0x62,0x0e,0xaa,0x18,0xbe,0x1b, /*a*/ 0xfc,0x56,0x3e,0x4b,0xc6,0xd2,0x79,0x20,0x9a,0xdb,0xc0,0xfe,0x78,0xcd,0x5a,0xf4, /*b*/ 0x1f,0xdd,0xa8,0x33,0x88,0x07,0xc7,0x31,0xb1,0x12,0x10,0x59,0x27,0x80,0xec,0x5f, /*c*/ 0x60,0x51,0x7f,0xa9,0x19,0xb5,0x4a,0x0d,0x2d,0xe5,0x7a,0x9f,0x93,0xc9,0x9c,0xef, /*d*/ 0xa0,0xe0,0x3b,0x4d,0xae,0x2a,0xf5,0xb0,0xc8,0xeb,0xbb,0x3c,0x83,0x53,0x99,0x61, /*e*/ 0x17,0x2b,0x04,0x7e,0xba,0x77,0xd6,0x26,0xe1,0x69,0x14,0x63,0x55,0x21,0x0c,0x7d /*f*/ }; unsigned char AES::RoundKey[240] = {0x00}; //-------------构造函数,密钥扩展------------- AES::AES(unsigned char key[16]){ KeyExpansion(key); } //-------------字节替代------------- void AES::SubBytes(unsigned char state[][4]){ for(int r = 0; r < 4; r++){ for(int c = 0; c < 4; c++){ state[r][c] = SBOX[state[r][c]]; } } } //-------------行移位变换------------- void AES::ShiftRows(unsigned char state[][4]){ unsigned char temp[4]; int r,c; for(r = 1; r < 4; r++){ for(c = 0; c < 4; c++){ temp[c] = state[r][(r+c)%4]; } for(c = 0; c < 4; c++){ state[r][c] = temp[c]; } } } //-------------列混淆变换------------- void AES::MixColumns(unsigned char state[][4]){ unsigned char t[4]; int r,c; for(c=0; c< 4; c++){ for(r=0; r<4; r++){ t[r] = state[r][c]; } for(r=0; r<4; r++){ state[r][c] = FFmul(0x02, t[r]) // 在GF(256)中,加法就是异或运算 ^ FFmul(0x03, t[(r+1)%4]) ^ FFmul(0x01, t[(r+2)%4]) ^ FFmul(0x01, t[(r+3)%4]); } } } //-------------轮密钥加变换------------- void AES::AddRoundKey(unsigned char state[][4],int round){ for(int c = 0; c < 4; c++){ for(int r = 0; r < 4; r++){ state[r][c] ^= RoundKey[round * 4 * 4 + c * 4 + r]; } } } //-------------有限域GF(28)上的乘法------------- unsigned char AES::FFmul(unsigned char a, unsigned char b){ unsigned char bw[4]; unsigned char res=0; int i; bw[0] = b; //b[0] b[1] b[2] b[4] for(i=1; i<4; i++){ //0x01 0x02 0x04 0x08 bw[i] = bw[i-1]<<1; if(bw[i-1]&0x80){ bw[i]^=0x1b; } } for(i=0; i<4; i++){ if((a>>i)&0x01){ res ^= bw[i]; } } return res; } //-------------密钥扩展------------- void AES::KeyExpansion(unsigned char key[16]){ unsigned char temp[4],swap; unsigned char Rcon[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36}; //第一轮密钥就是原始密钥 int i,j; for(i = 0; i < 4; i++){ for(j = 0; j < 4; j++){ RoundKey[i*4+j] = key[i*4+j]; } } //其他 密钥均来源于上轮密钥 while(i < 44){ for(j = 0; j < 4; j++){ temp[j] = RoundKey[(i-1)*4+j]; //取轮密钥最后一列 } if(i%4==0){ //32位字中4字节循环左移一次 swap = temp[0]; temp[0] = temp[1]; temp[1] = temp[2]; temp[2] = temp[3]; temp[3] = swap; //S盒转换 for(int k = 0; k < 4; k++){ temp[k] = SBOX[temp[k]]; } //与Rcon异或 temp[0] = temp[0] ^ Rcon[i/4-1]; } for (int k = 0; k < 4; k++){ RoundKey[i*4+k] = RoundKey[(i-4)*4+k] ^ temp[k]; } i++; } } //-------------逆字节替代------------- void AES::InvSubBytes(unsigned char state[][4]){ for(int r = 0; r < 4; r++){ for(int c = 0; c < 4;c++){ state[r][c] = INVSBOX[state[r][c]]; } } } //-------------逆行移位------------- void AES::InvShiftRows(unsigned char state[][4]){ unsigned char temp[4]; int r,c; for(r = 1; r < 4; r++){ for(c = 0;c < 4; c++){ temp[c] = state[r][(c-r+4)%4]; } for(c = 0; c < 4; c++){ state[r][c] = temp[c]; } } } //-------------逆列混淆------------- void AES::InvMixColumns(unsigned char state[][4]){ unsigned char temp[4]; int r,c; for(c = 0; c < 4; c++){ for(r = 0;r < 4; r++){ temp[r] = state[r][c]; } for(r = 0; r < 4; r++){ state[r][c] = FFmul(0x0e, temp[r]) ^ FFmul(0x0b, temp[(r+1)%4]) ^ FFmul(0x0d, temp[(r+2)%4]) ^ FFmul(0x09, temp[(r+3)%4]); } } } //-------------加密过程------------- unsigned char* AES::Clipher(unsigned char* input){ unsigned char state[4][4]; int i,r,c; for(r = 0; r < 4; r++){ for(c = 0; c< 4; c++){ state[r][c] = input[c*4+r]; } } AddRoundKey(state,0); for(i = 1; i <= 10; i++){ SubBytes(state); ShiftRows(state); if(i!=10)MixColumns(state); AddRoundKey(state,i); } for(r = 0; r < 4; r++){ for(c = 0; c < 4; c++){ input[c*4+r] = state[r][c]; } } return input; } //-------------解密过程------------- unsigned char* AES::InvClipher(unsigned char* input){ unsigned char state[4][4]; int i,r,c; for(r = 0; r < 4; r++){ for(c = 0; c< 4; c++){ state[r][c] = input[c*4+r]; } } AddRoundKey(state,10); for(i = 9; i >= 0; i--){ InvShiftRows(state); InvSubBytes(state); AddRoundKey(state,i); if(i)InvMixColumns(state); } for(r = 0; r < 4; r++){ for(c = 0; c< 4; c++){ input[c*4+r] = state[r][c]; } } return input; }
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