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  1. #include <stdio.h>
  2.  
  3. // AES S-Box
  4. unsigned char S[] = {
  5.     0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
  6.     0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
  7.     0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
  8.     0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
  9.     0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
  10.     0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
  11.     0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
  12.     0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
  13.     0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
  14.     0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
  15.     0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
  16.     0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
  17.     0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
  18.     0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
  19.     0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
  20.     0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 };
  21.  
  22. // AES Inverse S-Box
  23. unsigned char SI[] = {
  24.     0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB,
  25.     0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB,
  26.     0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E,
  27.     0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25,
  28.     0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92,
  29.     0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84,
  30.     0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06,
  31.     0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B,
  32.     0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73,
  33.     0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E,
  34.     0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B,
  35.     0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4,
  36.     0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F,
  37.     0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF,
  38.     0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61,
  39.     0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D };
  40.  
  41. unsigned char mixColumn[] = {
  42.     0x02, 0x03, 0x01, 0x01,
  43.     0x01, 0x02, 0x03, 0x01,
  44.     0x01, 0x01, 0x02, 0x03,
  45.     0x03, 0x01, 0x01, 0x02
  46. };
  47.  
  48. unsigned char rcon[] = {
  49.     0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x1b, 0x36
  50. };
  51.  
  52. unsigned char invMixColumn[] = {
  53.     0x0E, 0x0B, 0x0D, 0x09,
  54.     0x09, 0x0E, 0x0B, 0x0D,
  55.     0x0D, 0x09, 0x0E, 0x0B,
  56.     0x0B, 0x0D, 0x09, 0x0E
  57. };
  58.  
  59. void printM(unsigned char* state)
  60. {
  61.     for (int i = 0; i < 16; i++)
  62.     {
  63.         printf("%x ", state[i]);
  64.     }
  65.     printf("\n");
  66. }
  67.  
  68. void copyM(unsigned char* state, unsigned char* out)
  69. {
  70.     for (int i = 0; i < 16; i++)
  71.     {
  72.         out[i] = state[i];
  73.     }
  74. }
  75.  
  76. unsigned char mul1(unsigned char x){
  77.     return x;
  78. }
  79.  
  80. unsigned char mul2(unsigned char x)
  81. {
  82.     if (x < 128){
  83.         return (x << 1);
  84.     }
  85.     else
  86.     {
  87.         return ((x << 1) ^ 0x1B);
  88.     }
  89. }
  90.  
  91. unsigned char mul3(unsigned char x)
  92. {
  93.     return (mul2(x) ^ x);
  94. }
  95.  
  96. unsigned char decideMix(unsigned char in, unsigned char method)
  97. {
  98.     if (method == 0x03)
  99.     {
  100.         return mul3(in);
  101.     }
  102.     else if (method == 0x02)
  103.     {
  104.         return mul2(in);
  105.     }
  106.     else
  107.     {
  108.         return in;
  109.     }
  110. }
  111.  
  112. void mixColumnOps(unsigned char* State)
  113. {
  114.     unsigned char temp[16] = {0};
  115.     copyM(State, temp);
  116.  
  117.     for (int stateCount = 0; stateCount < 4; stateCount++)
  118.     {
  119.         unsigned char temp1 = temp[stateCount+0];
  120.         unsigned char temp2 = temp[stateCount+4];
  121.         unsigned char temp3 = temp[stateCount+8];
  122.         unsigned char temp4 = temp[stateCount+12];
  123.  
  124.         State[stateCount+0] = decideMix(temp1,mixColumn[0]) ^ decideMix(temp2,mixColumn[1]) ^ decideMix(temp3,mixColumn[2]) ^ decideMix(temp4,mixColumn[3]);
  125.         State[stateCount+4] = decideMix(temp1,mixColumn[4]) ^ decideMix(temp2,mixColumn[5]) ^ decideMix(temp3,mixColumn[6]) ^ decideMix(temp4,mixColumn[7]);
  126.         State[stateCount+8] = decideMix(temp1,mixColumn[8]) ^ decideMix(temp2,mixColumn[9]) ^ decideMix(temp3,mixColumn[10]) ^ decideMix(temp4,mixColumn[11]);
  127.         State[stateCount+12] = decideMix(temp1,mixColumn[12]) ^ decideMix(temp2,mixColumn[13]) ^ decideMix(temp3,mixColumn[14]) ^ decideMix(temp4,mixColumn[15]);
  128.     }
  129. }
  130.  
  131. void subBytes(unsigned char* State)
  132. {
  133.     for (int i = 0; i < 16; i++)
  134.     {
  135.         State[i] = S[State[i]];
  136.     }
  137. }
  138.  
  139. void leftRotate(unsigned char* arr, int startIndex, int d)
  140. {  
  141.     for (int i = 0; i < d; i++)
  142.     {
  143.         unsigned char temp = arr[startIndex], i;
  144.  
  145.         for (i = startIndex; i < startIndex+3; i++)
  146.         {
  147.             arr[i] = arr[i + 1];
  148.         }
  149.  
  150.         arr[i] = temp;
  151.     }
  152. }
  153.  
  154. void shiftRows(unsigned char* State)
  155. {
  156.     for (int i = 0; i < 4; i++)
  157.     {
  158.         leftRotate(State, i*4, i);
  159.     }
  160. }
  161.  
  162. void addRoundKey(unsigned char* State, unsigned char* key)
  163. {
  164.     for (int i = 0; i < 16; i++)
  165.     {
  166.         State[i] = State[i] ^ key[i];
  167.     }
  168. }
  169.  
  170. void printRowOne(unsigned char* state, int startIndex)
  171. {
  172.     for (int i = 0; i < 4; i++)
  173.     {
  174.         printf("%x \n", state[i*4 + startIndex]);
  175.     }
  176.     printf("\n");
  177. }
  178.  
  179. void rotWord(unsigned char* state)
  180. {
  181.     unsigned char holderVal = state[12];
  182.     for (int i = 0; i < 3; i++)
  183.     {
  184.         state[12+i] = state[13+i];
  185.     }
  186.     state[15] = holderVal;
  187. }
  188.  
  189. void rowSubBytes(unsigned char* key)
  190. {
  191.     for (int i = 0; i < 4; i++)
  192.     {
  193.         key[12+i] = S[key[12+i]];
  194.     }
  195. }
  196.  
  197. void rowXor(unsigned char* key, unsigned char* holderState, int rconIndex)
  198. {
  199.     for (int k = 0; k < 13; k = k + 4)
  200.     {
  201.         if (k == 0)
  202.         {
  203.             for (int i = 0; i < 4; i++)
  204.             {
  205.                 if (i == 0)
  206.                     key[i] = holderState[i] ^ key[12+i] ^ rcon[rconIndex];
  207.                 else
  208.                 {
  209.                     key[i] = holderState[i] ^ key[12+i];
  210.                 }
  211.             }
  212.         }
  213.         else
  214.         {
  215.             for (int i = 0; i < 4; i++)
  216.             {
  217.                 key[k+i] = holderState[k+i] ^ key[k+i-4];
  218.             }
  219.         }
  220.     }
  221. }
  222.  
  223. void inverseRowXor(unsigned char* key, int rconIndex)
  224. {
  225.     for (int k = 3; k > -1; k--)
  226.     {
  227.         if (k != 0)
  228.         {
  229.             for (int i = 0; i < 4; i++)
  230.             {
  231.                 key[i*4+k] = key[i*4+k] ^ key[i*4+k-1];
  232.             }
  233.         }
  234.     }
  235. }
  236.  
  237. void copyArray(unsigned char* origin, unsigned char* copied)
  238. {
  239.     for (int i = 0; i < 16; i++)
  240.     {
  241.         copied[i] = origin[i];
  242.     }
  243. }
  244.  
  245. void xorColumnByIndex (unsigned char* first, int indexF, unsigned char* second, int indexS)
  246. {
  247.     for (int i = 0; i < 4; i++)
  248.     {
  249.         first[indexF+i] = first[indexF+i] ^ second[indexS+i];
  250.     }
  251. }
  252.  
  253. void transposeMatrix(unsigned char* state, unsigned char* copiedState)
  254. {
  255.     copyArray(state, copiedState);
  256.     for(int i = 0; i < 4; i++)
  257.     {
  258.         state[i*4] = copiedState[i];
  259.         state[i*4+1] = copiedState[i+4];
  260.         state[i*4+2] = copiedState[i+8];
  261.         state[i*4+3] = copiedState[i+12];
  262.     }
  263. }
  264.  
  265. void newKeyGenerate (unsigned char* key, int round, int inverse)
  266. {
  267.     if (inverse == 0)
  268.     {
  269.         unsigned char holderState[16];
  270.         copyArray(key, holderState);
  271.  
  272.         rotWord(key);
  273.         rowSubBytes(key);
  274.         rowXor(key, holderState, round);
  275.     }
  276.     else
  277.     {
  278.         inverseRowXor(key, 0);
  279.  
  280.         unsigned char holderState[16];
  281.         copyArray(key, holderState);
  282.         rotWord(holderState);
  283.         rowSubBytes(holderState);
  284.  
  285.         xorColumnByIndex(key,0,holderState,3);
  286.         key[0] = key[0] ^ rcon[round];
  287.     }
  288. }
  289.  
  290. unsigned char testState[] = {
  291.     0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16
  292. };
  293.  
  294. unsigned char key[] = {
  295.     0x54, 0x68, 0x61, 0x74, 0x73, 0x20, 0x6d, 0x79, 0x20, 0x4B, 0x75, 0x6E, 0x67, 0x20, 0x46, 0x75
  296. };
  297.  
  298. unsigned char testKey[] = {
  299.     0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c
  300. };
  301.  
  302. unsigned char state[] = {
  303.     0x54, 0x77, 0x6f, 0x20, 0x4f, 0xe6, 0x65, 0x20, 0x4e, 0x69, 0x6e, 0x65, 0x20, 0x54, 0x77, 0x6f
  304. };
  305.  
  306. int main(void)
  307. {
  308.     newKeyGenerate(key,0,0);
  309.     printM(key);
  310.     newKeyGenerate(key,1,0);
  311.     printM(key);
  312.     newKeyGenerate(key,2,0);
  313.     printM(key);
  314.     newKeyGenerate(key,3,0);
  315.     printM(key);
  316.  
  317.     return 0;
  318. }
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