/****************************************************************/ /* 802.11 AES Block Cipher */ /* Implements the 802.11 form of AES. I.E. 128 bit key with */ /* 128 bit data. */ /* (c) 2002, David Johnston */ /* Author: David Johnston */ /* Email (home) : dj@deadhat.com */ /* Email (general) : david.johnston@ieee.org */ /* Version 0.1 */ /****************************************************************/ #include #include /**********************************************/ /* Test Cases */ /* An array of test cases, each containing */ /* a data block and a key. */ /* These have been taken from Brian Gladman's */ /* test vectors and appear to match. */ /**********************************************/ #define NUM_TEST_CASES 257 unsigned char keys[] = { 0x2b,0x7e,0x15,0x16,0x28,0xae,0xd2,0xa6,0xab,0xf7,0x15,0x88,0x09,0xcf,0x4f,0x3c, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03, 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0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 }; /*****************************/ /**** Function Prototypes ****/ /*****************************/ void get_test_case( int test_case, unsigned char *plaintext); void xor_128(unsigned char *a, unsigned char *b, unsigned char *out); void xor_32(unsigned char *a, unsigned char *b, unsigned char *out); unsigned char sbox(unsigned char a); void next_key(unsigned char *key, int round); void byte_sub(unsigned char *in, unsigned char *out); void shift_row(unsigned char *in, unsigned char *out); void mix_column(unsigned char *in, unsigned char *out); void add_round_key( unsigned char *shiftrow_in, unsigned char *mcol_in, unsigned char *block_in, int round, unsigned char *out); void aes128k128d(unsigned char *key, unsigned char *data, unsigned char *ciphertext); /****************************************/ /* aes128k128d() */ /* Performs a 128 bit AES encrypt with */ /* 128 bit data. */ /****************************************/ void xor_128(unsigned char *a, unsigned char *b, unsigned char *out) { int i; for (i=0;i<16; i++) { out[i] = a[i] ^ b[i]; } } void xor_32(unsigned char *a, unsigned char *b, unsigned char *out) { int i; for (i=0;i<4; i++) { out[i] = a[i] ^ b[i]; } } unsigned char sbox(unsigned char a) { return sbox_table[(int)a]; } void next_key(unsigned char *key, int round) { unsigned char rcon; unsigned char sbox_key[4]; unsigned char rcon_table[12] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x36, 0x36 }; sbox_key[0] = sbox(key[13]); sbox_key[1] = sbox(key[14]); sbox_key[2] = sbox(key[15]); sbox_key[3] = sbox(key[12]); rcon = rcon_table[round]; xor_32(&key[0], sbox_key, &key[0]); key[0] = key[0] ^ rcon; xor_32(&key[4], &key[0], &key[4]); xor_32(&key[8], &key[4], &key[8]); xor_32(&key[12], &key[8], &key[12]); } void byte_sub(unsigned char *in, unsigned char *out) { int i; for (i=0; i< 16; i++) { out[i] = sbox(in[i]); } } void shift_row(unsigned char *in, unsigned char *out) { out[0] = in[0]; out[1] = in[5]; out[2] = in[10]; out[3] = in[15]; out[4] = in[4]; out[5] = in[9]; out[6] = in[14]; out[7] = in[3]; out[8] = in[8]; out[9] = in[13]; out[10] = in[2]; out[11] = in[7]; out[12] = in[12]; out[13] = in[1]; out[14] = in[6]; out[15] = in[11]; } void mix_column(unsigned char *in, unsigned char *out) { int i; unsigned char add1b[4]; unsigned char add1bf7[4]; unsigned char rotl[4]; unsigned char swap_halfs[4]; unsigned char andf7[4]; unsigned char rotr[4]; unsigned char temp[4]; unsigned char tempb[4]; for (i=0 ; i<4; i++) { if ((in[i] & 0x80)== 0x80) add1b[i] = 0x1b; else add1b[i] = 0x00; } swap_halfs[0] = in[2]; /* Swap halfs */ swap_halfs[1] = in[3]; swap_halfs[2] = in[0]; swap_halfs[3] = in[1]; rotl[0] = in[3]; /* Rotate left 8 bits */ rotl[1] = in[0]; rotl[2] = in[1]; rotl[3] = in[2]; andf7[0] = in[0] & 0x7f; andf7[1] = in[1] & 0x7f; andf7[2] = in[2] & 0x7f; andf7[3] = in[3] & 0x7f; for (i = 3; i>0; i--) /* logical shift left 1 bit */ { andf7[i] = andf7[i] << 1; if ((andf7[i-1] & 0x80) == 0x80) { andf7[i] = (andf7[i] | 0x01); } } andf7[0] = andf7[0] << 1; andf7[0] = andf7[0] & 0xfe; xor_32(add1b, andf7, add1bf7); xor_32(in, add1bf7, rotr); temp[0] = rotr[0]; /* Rotate right 8 bits */ rotr[0] = rotr[1]; rotr[1] = rotr[2]; rotr[2] = rotr[3]; rotr[3] = temp[0]; xor_32(add1bf7, rotr, temp); xor_32(swap_halfs, rotl,tempb); xor_32(temp, tempb, out); } void aes128k128d(unsigned char *key, unsigned char *data, unsigned char *ciphertext) { int round; int i; unsigned char intermediatea[16]; unsigned char intermediateb[16]; unsigned char round_key[16]; for(i=0; i<16; i++) round_key[i] = key[i]; for (round = 0; round < 11; round++) { if (round == 0) { xor_128(round_key, data, ciphertext); next_key(round_key, round); } else if (round == 10) { byte_sub(ciphertext, intermediatea); shift_row(intermediatea, intermediateb); xor_128(intermediateb, round_key, ciphertext); } else /* 1 - 9 */ { byte_sub(ciphertext, intermediatea); shift_row(intermediatea, intermediateb); mix_column(&intermediateb[0], &intermediatea[0]); mix_column(&intermediateb[4], &intermediatea[4]); mix_column(&intermediateb[8], &intermediatea[8]); mix_column(&intermediateb[12], &intermediatea[12]); xor_128(intermediatea, round_key, ciphertext); next_key(round_key, round); } } } /************************************************/ /* get_test_case() */ /* Copies an mpdu from the test case data */ /************************************************/ void get_test_case( int test_case, unsigned char *plaintext) { int i; unsigned char *ptr; ptr = test_cases + (16 * (test_case - 1)); for (i=0; i< 16; i++) { plaintext[i] = *ptr++; } } /****************************************************/ /* main() */ /* Iterate through the test cases, passing them */ /* through the ccm algorithm to produce test */ /* vectors */ /****************************************************/ int main() { int test_case; int j; unsigned char plaintext[16]; unsigned char ciphertext[16]; unsigned char *key; for (test_case = 1; test_case < (NUM_TEST_CASES+1); test_case++) { printf ("TEST CASE %d\n",test_case); key = keys + (16 * (test_case-1)); get_test_case(test_case, plaintext); aes128k128d(key,plaintext,ciphertext); /* Call the Encryption Function */ /* Print out the result */ printf("\tKEY (lsb first, msb last) : "); /* Print the key */ printf("%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", key[0], key[1], key[2], key[3], key[4], key[5], key[6], key[7], key[8], key[9], key[10], key[11], key[12], key[13], key[14], key[15] ); printf("\tData (lsb first, msb last) : "); for (j=0; j<16;j++) { printf("%02x ",plaintext[j]); } printf("\n"); printf("\tCiphertext (lsb first, msb last) : "); for (j=0; j<16;j++) { printf("%02x ",ciphertext[j]); } printf ("\n"); } return 0; }