306 lines
9.2 KiB
C++
306 lines
9.2 KiB
C++
#include "aes.h"
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unsigned char AES::sBox[] =
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{ // 0 1 2 3 4 5 6 7 8 9 a b c d e f
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0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, //0
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0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, //1
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0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, //2
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0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, //3
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0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, //4
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0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, //5
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0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, //6
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0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, //7
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0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, //8
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0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, //9
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0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, //a
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0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, //b
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0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, //c
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0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, //d
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0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, //e
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0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 //f
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};
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unsigned char AES::invSBox[] =
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{ /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
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0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb, //0
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0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb, //1
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0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e, //2
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0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25, //3
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0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92, //4
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0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84, //5
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0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06, //6
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0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b, //7
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0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73, //8
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0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e, //9
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0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b, //a
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0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4, //b
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0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f, //c
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0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef, //d
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0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61, //e
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0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d //f
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};
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unsigned char AES::rcon[] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36 };
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AES::AES()
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{
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//If no key is input,use the default key
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unsigned char key[16] = {
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0x0f, 0x15, 0x71, 0xc9,
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0x47, 0xd9, 0xe8, 0x59,
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0x0c, 0xb7, 0xad, 0xd6,
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0xaf, 0x7f, 0x67, 0x98
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};
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setKey(key);
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keyExpansion();
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}
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AES::AES(const unsigned char *key){
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setKey(key);
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keyExpansion();
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}
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void AES::setKey(const unsigned char key[]){
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mNb = 4;
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mNk = 4;
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mNr = 10;
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memcpy(mKey, key, mNk * 4);
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}
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void AES::keyExpansion() {
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//the first mNk words will be filled in mW derictly
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for (int i = 0; i < mNk; i++){
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for (int j = 0; j < 4; j++){
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//arranged vertically
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mW[i][j] = mKey[j+i*4];
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}
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}
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//generate the secret key words
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for (int i = mNk; i < mNb*(mNr + 1); i++){
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//last secret key word
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unsigned char pre_w[4];
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for (int k = 0; k < 4; k++){
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pre_w[k] = mW[i-1][k];
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}
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if(i%mNk == 0){
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rotWord(pre_w);
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subWord(pre_w);
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pre_w[0] = pre_w[0] ^= rcon[i / mNk - 1];
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}
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else if ((mNk>6)&&(i%mNk==4)){
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subWord(pre_w);
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}
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for (int k = 0; k < 4; k++){
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mW[i][k] = pre_w[k] ^ mW[i-mNk][k];
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}
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}
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}
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void AES::subBytes(unsigned char state[][4])
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{
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for (int i = 0; i < 4; i++){
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for (int j = 0; j < 4; j++){
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state[i][j] = sBox[state[i][j]];
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}
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}
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}
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void AES::shiftRows(unsigned char state[][4])
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{
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unsigned char t[4];
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for (int i = 1; i < 4; i++){
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for (int j = 0; j < 4; j++){
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t[j] = state[i][(i + j) % 4];
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}
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for (int j = 0; j < 4; j++){
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state[i][j] = t[j];
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}
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}
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}
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void AES::mixColumns(unsigned char state[][4])
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{
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unsigned char t[4];
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for (int j = 0; j < 4; j++){
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for (int i = 0; i < 4; i++){
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t[i] = state[i][j];
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}
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for (int i = 0; i < 4; i++){
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state[i][j] = GF28Multi(t[i], 0x02)
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^ GF28Multi(t[(i + 1) % 4], 0x03)
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^ GF28Multi(t[(i + 2) % 4], 0x01)
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^ GF28Multi(t[(i + 3) % 4], 0x01);
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}
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}
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}
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void AES::addRoundKey(unsigned char state[][4], unsigned char w[][4])
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{
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for (int i = 0; i < 4; i++){
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for (int j = 0; j < 4; j++){
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state[i][j] ^= w[i][j];
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}
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}
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}
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void AES::invSubBytes(unsigned char state[][4])
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{
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for (int i = 0; i < 4; i++){
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for (int j = 0; j < 4; j++){
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state[i][j] = invSBox[state[i][j]];
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}
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}
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}
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void AES::invShiftRows(unsigned char state[][4])
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{
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unsigned char t[4];
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for (int i = 0; i < 4; i++){
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for (int j = 0; j < 4; j++){
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t[j] = state[i][(j-i + 4) % 4];
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}
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for (int j = 0; j < 4; j++){
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state[i][j] = t[j];
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}
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}
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}
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void AES::invMixColumns(unsigned char state[][4])
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{
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unsigned char t[4];
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//calculate columns by columns
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for (int j = 0; j < 4; j++){
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for (int i = 0; i < 4; i++){
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t[i] = state[i][j];
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}
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for (int i = 0; i < 4; i++){
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state[i][j] = GF28Multi(t[i], 0x0e)
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^ GF28Multi(t[(i+1)%4],0x0b)
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^ GF28Multi(t[(i+2)%4],0x0d)
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^ GF28Multi(t[(i+3)%4],0x09);
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}
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}
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}
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void AES::rotWord(unsigned char w[])
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{
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unsigned char t;
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t = w[0];
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w[0] = w[1];
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w[1] = w[2];
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w[2] = w[3];
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w[3] = t;
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}
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void AES::subWord(unsigned char w[])
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{
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for (int i = 0; i < 4; i++){
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w[i] = sBox[w[i]];
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}
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}
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//calculate the least significant unsigned char only for we only need
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//the least significant byte
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unsigned char AES::GF28Multi(unsigned char s,unsigned char a){
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unsigned char t[4];
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unsigned char result = 0;
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t[0] = s;
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//calculate s*{02}，s*{03}，s*{04}
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for (int i = 1; i < 4; i++){
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t[i] = t[i - 1] << 1;
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if (t[i - 1] & 0x80){
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t[i] ^= 0x1b;
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}
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}
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//multiply a and s bit by bit and sum together
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for (int i = 0; i < 4; i++){
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if ((a >> i) & 0x01){
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result ^= t[i];
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}
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}
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return result;
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}
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void AES::encrypt(const unsigned char data[16], unsigned char out[16])
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{
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unsigned char state[4][4];
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unsigned char key[4][4];
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for (int i = 0; i < 4; i++){
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for (int j = 0; j < 4; j++){
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state[i][j] = data[i+j*4];
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}
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}
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getKeyAt(key, 0);
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addRoundKey(state, key);
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for (int i = 1; i <= mNr; i++){
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subBytes(state);
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shiftRows(state);
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if (i != mNr){
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mixColumns(state);
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}
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getKeyAt(key, i);
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addRoundKey(state, key);
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}
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for (int i = 0; i < 4; i++){
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for (int j = 0; j < 4; j++){
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out[i+j*4] = state[i][j];
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}
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}
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}
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void AES::decrypt(const unsigned char data[16], unsigned char out[16])
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{
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unsigned char state[4][4];
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unsigned char key[4][4];
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for (int i = 0; i < 4; i++){
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for (int j = 0; j < 4; j++){
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state[i][j] = data[i+j*4];
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}
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}
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getKeyAt(key, mNr);
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addRoundKey(state,key);
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for (int i = (mNr - 1); i >= 0; i--){
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invShiftRows(state);
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invSubBytes(state);
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getKeyAt(key, i);
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addRoundKey(state,key);
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if (i){
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invMixColumns(state);
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}
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}
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for (int i = 0; i < 4; i++){
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for (int j = 0; j < 4; j++){
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out[i + j * 4] = state[i][j];
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}
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}
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}
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//get the secret key for round "index",which will
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//be arranged vetically
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void AES::getKeyAt(unsigned char key[][4], int index){
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for (int i = index*4; i < index*4+4; i++){
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for (int j = 0; j < 4; j++){
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key[j][i-index*4] = mW[i][j];
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}
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}
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}
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AES::~AES()
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{
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}
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