#include #include /* AES-128 simple implementation template and testing */ /* Author: Ondrej Hladuvka, hladuond@fit.cvut.cz Template: Jiri Bucek 2017 AES specification: http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf */ /* AES Constants */ // forward sbox const uint8_t 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 }; const uint8_t rCon[12] = { 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, }; /* AES state type */ typedef uint32_t t_state[4]; /* Helper functions */ void hexprint16(uint8_t *p) { for (int i = 0; i < 16; i++) printf("%02hhx ", p[i]); puts(""); } void hexprintw(uint32_t w) { for (int i = 0; i < 32; i += 8) printf("%02hhx ", (w >> i) & 0xffU); } void hexprintws(uint32_t * p, int cnt) { for (int i = 0; i < cnt; i++) hexprintw(p[i]); puts(""); } void printstate(t_state s) { hexprintw(s[0]); hexprintw(s[1]); hexprintw(s[2]); hexprintw(s[3]); puts(""); } uint32_t word(uint8_t a0, uint8_t a1, uint8_t a2, uint8_t a3) { return a0 | (uint32_t)a1 << 8 | (uint32_t)a2 << 16 | (uint32_t)a3 << 24; } uint8_t wbyte(uint32_t w, int pos) { return (w >> (pos * 8)) & 0xff; } // **************** AES functions **************** uint32_t subWord(uint32_t w) { return word(SBOX[wbyte(w, 0)], SBOX[wbyte(w, 1)], SBOX[wbyte(w, 2)], SBOX[wbyte(w, 3)]); } void subBytes(t_state s) { unsigned char* p = reinterpret_cast(s); for (int i = 0; i < 16; ++i) p[i] = SBOX[p[i]]; } void shiftRows(t_state s) { uint32_t tmp[4]; tmp[0] = s[0] & 0x0000FF00; tmp[1] = s[1] & 0x0000FF00; tmp[2] = s[2] & 0x0000FF00; tmp[3] = s[3] & 0x0000FF00; s[0] = (s[0] & 0xFFFF00FF) | tmp[1]; s[1] = (s[1] & 0xFFFF00FF) | tmp[2]; s[2] = (s[2] & 0xFFFF00FF) | tmp[3]; s[3] = (s[3] & 0xFFFF00FF) | tmp[0]; tmp[0] = s[0] & 0x00FF0000; tmp[1] = s[1] & 0x00FF0000; tmp[2] = s[2] & 0x00FF0000; tmp[3] = s[3] & 0x00FF0000; s[0] = (s[0] & 0xFF00FFFF) | tmp[2]; s[1] = (s[1] & 0xFF00FFFF) | tmp[3]; s[2] = (s[2] & 0xFF00FFFF) | tmp[0]; s[3] = (s[3] & 0xFF00FFFF) | tmp[1]; tmp[0] = s[0] & 0xFF000000; tmp[1] = s[1] & 0xFF000000; tmp[2] = s[2] & 0xFF000000; tmp[3] = s[3] & 0xFF000000; s[0] = (s[0] & 0x00FFFFFF) | tmp[3]; s[1] = (s[1] & 0x00FFFFFF) | tmp[0]; s[2] = (s[2] & 0x00FFFFFF) | tmp[1]; s[3] = (s[3] & 0x00FFFFFF) | tmp[2]; } uint8_t xtime(uint8_t c) { uint8_t m = ((c & 0x80) >> 7) * 0x1B; return (c << 1) ^ m; } void mixColumns(t_state s) { for (int i = 0; i < 4; i++) { uint8_t a0 = wbyte(s[i], 0); uint8_t a1 = wbyte(s[i], 1); uint8_t a2 = wbyte(s[i], 2); uint8_t a3 = wbyte(s[i], 3); uint8_t r0 = xtime(a0) ^ xtime(a1) ^ a1 ^ a2 ^ a3; uint8_t r1 = xtime(a1) ^ xtime(a2) ^ a2 ^ a3 ^ a0; uint8_t r2 = xtime(a2) ^ xtime(a3) ^ a3 ^ a0 ^ a1; uint8_t r3 = xtime(a3) ^ xtime(a0) ^ a0 ^ a1 ^ a2; s[i] = word(r0, r1, r2, r3); } } /* * Key expansion from 128bits (4*32b) * to 11 round keys (11*4*32b) * each round key is 4*32b */ void expandKey(uint8_t k[16], uint32_t ek[44]) { for (int i = 0; i < 4; i++) { ek[i] = word(k[4*i], k[4*i + 1], k[4*i + 2], k[4*i + 3]); } for (int i = 4; i < 44; i++) { uint32_t temp = ek[i - 1]; if (i % 4 == 0) { // RotWord, SubWord, and XOR with Rcon temp = subWord((temp >> 8) | (temp << 24)) ^ rCon[i / 4]; } ek[i] = ek[i - 4] ^ temp; } } /* Adding expanded round key (prepared before) */ void addRoundKey(t_state s, uint32_t ek[], short index) { for (int i = 0; i < 4; i++) { s[i] ^= ek[index + i]; } } void aes128_4(uint8_t *in, uint8_t *out, uint32_t * expKey) { t_state state; state[0] = word(in[0], in[1], in[2], in[3]); state[1] = word(in[4], in[5], in[6], in[7]); state[2] = word(in[8], in[9], in[10], in[11]); state[3] = word(in[12], in[13], in[14], in[15]); addRoundKey(state, expKey, 0); for (int round = 0; round < 9; ++round) { subBytes(state); shiftRows(state); mixColumns(state); addRoundKey(state, expKey, round * 4 + 4); } subBytes(state); shiftRows(state); addRoundKey(state, expKey, 10 * 4); out[0] = wbyte(state[0], 0); out[1] = wbyte(state[0], 1); out[2] = wbyte(state[0], 2); out[3] = wbyte(state[0], 3); out[4] = wbyte(state[1], 0); out[5] = wbyte(state[1], 1); out[6] = wbyte(state[1], 2); out[7] = wbyte(state[1], 3); out[8] = wbyte(state[2], 0); out[9] = wbyte(state[2], 1); out[10] = wbyte(state[2], 2); out[11] = wbyte(state[2], 3); out[12] = wbyte(state[3], 0); out[13] = wbyte(state[3], 1); out[14] = wbyte(state[3], 2); out[15] = wbyte(state[3], 3); } //**************************** // MAIN function: AES testing //**************************** // int main(int argc, char* argv[]) // { // int test_failed = 0; // // test subBytes // printf("Testing subBytes\n"); // { // t_state state = { 0x01234567, // 0x89abcdef, // 0xdeadbeef, // 0x00112233 }; // t_state res_state = { 0x7c266e85, // 0xa762bddf, // 0x1d95aedf, // 0x638293c3 }; // subBytes(state); // // printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", state[0], state[1], state[2], state[3]); // for (int i = 0; i < 4; i++) { // if (state[i] != res_state[i]) { printf("Mismatch at state[%d]!\n", i); test_failed = 1; } // } // } // // test shiftRows // printf("Testing shiftRows\n"); // { // t_state state = { 0x01234567, // 0x89abcdef, // 0xdeadbeef, // 0x00112233 }; // t_state res_state = { 0x00adcd67, // 0x0111beef, // 0x892322ef, // 0xdeab4533 }; // shiftRows(state); // // printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", state[0], state[1], state[2], state[3]); // for (int i = 0; i < 4; i++) { // if (state[i] != res_state[i]) { printf("Mismatch at state[%d]! 0x%08x 0x%08x\n", i, res_state[i], state[i]); test_failed = 1; } // } // } // // test xtime // printf("Testing xtime\n"); // { // uint8_t res[256] = { 0x00, 0x02, 0x04, 0x06, 0x08, 0x0a, 0x0c, 0x0e, 0x10, 0x12, // 0x14, 0x16, 0x18, 0x1a, 0x1c, 0x1e, 0x20, 0x22, 0x24, 0x26, // 0x28, 0x2a, 0x2c, 0x2e, 0x30, 0x32, 0x34, 0x36, 0x38, 0x3a, // 0x3c, 0x3e, 0x40, 0x42, 0x44, 0x46, 0x48, 0x4a, 0x4c, 0x4e, // 0x50, 0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e, 0x60, 0x62, // 0x64, 0x66, 0x68, 0x6a, 0x6c, 0x6e, 0x70, 0x72, 0x74, 0x76, // 0x78, 0x7a, 0x7c, 0x7e, 0x80, 0x82, 0x84, 0x86, 0x88, 0x8a, // 0x8c, 0x8e, 0x90, 0x92, 0x94, 0x96, 0x98, 0x9a, 0x9c, 0x9e, // 0xa0, 0xa2, 0xa4, 0xa6, 0xa8, 0xaa, 0xac, 0xae, 0xb0, 0xb2, // 0xb4, 0xb6, 0xb8, 0xba, 0xbc, 0xbe, 0xc0, 0xc2, 0xc4, 0xc6, // 0xc8, 0xca, 0xcc, 0xce, 0xd0, 0xd2, 0xd4, 0xd6, 0xd8, 0xda, // 0xdc, 0xde, 0xe0, 0xe2, 0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xee, // 0xf0, 0xf2, 0xf4, 0xf6, 0xf8, 0xfa, 0xfc, 0xfe, 0x1b, 0x19, // 0x1f, 0x1d, 0x13, 0x11, 0x17, 0x15, 0x0b, 0x09, 0x0f, 0x0d, // 0x03, 0x01, 0x07, 0x05, 0x3b, 0x39, 0x3f, 0x3d, 0x33, 0x31, // 0x37, 0x35, 0x2b, 0x29, 0x2f, 0x2d, 0x23, 0x21, 0x27, 0x25, // 0x5b, 0x59, 0x5f, 0x5d, 0x53, 0x51, 0x57, 0x55, 0x4b, 0x49, // 0x4f, 0x4d, 0x43, 0x41, 0x47, 0x45, 0x7b, 0x79, 0x7f, 0x7d, // 0x73, 0x71, 0x77, 0x75, 0x6b, 0x69, 0x6f, 0x6d, 0x63, 0x61, // 0x67, 0x65, 0x9b, 0x99, 0x9f, 0x9d, 0x93, 0x91, 0x97, 0x95, // 0x8b, 0x89, 0x8f, 0x8d, 0x83, 0x81, 0x87, 0x85, 0xbb, 0xb9, // 0xbf, 0xbd, 0xb3, 0xb1, 0xb7, 0xb5, 0xab, 0xa9, 0xaf, 0xad, // 0xa3, 0xa1, 0xa7, 0xa5, 0xdb, 0xd9, 0xdf, 0xdd, 0xd3, 0xd1, // 0xd7, 0xd5, 0xcb, 0xc9, 0xcf, 0xcd, 0xc3, 0xc1, 0xc7, 0xc5, // 0xfb, 0xf9, 0xff, 0xfd, 0xf3, 0xf1, 0xf7, 0xf5, 0xeb, 0xe9, // 0xef, 0xed, 0xe3, 0xe1, 0xe7, 0xe5 }; // for (uint16_t i = 0; i < 256; i++) { // //printf("0x%02hhx, ", xtime((uint8_t)i)); // if (xtime((uint8_t)i)!=res[i]) { // printf("\nMismatch at xtime(0x%02x)! Comparison interrupted.\n", i); test_failed = 1; // break; // } // } // // puts(""); // } // // test mixColumns // printf("Testing mixColumns\n"); // { // t_state state = { 0x01234567, // 0x89abcdef, // 0xdeadbeef, // 0x00112233 }; // t_state res_state = { 0xcd678923, // 0x45ef01ab, // 0x9e69ba6f, // 0x66334411 }; // mixColumns(state); // // printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", state[0], state[1], state[2], state[3]); // // printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", res_state[0], res_state[1], res_state[2], res_state[3]); // for (int i = 0; i < 4; i++) { // if (state[i] != res_state[i]) { printf("Mismatch at state[%d]! 0x%08x\n", i, state[i]); test_failed = 1; } // } // } // // test key expansion // printf("Testing expandKey\n"); // { // uint8_t key_b[16] = { 0xef, 0xbe, 0xad, 0xde, 0xbe, 0xba, 0xfe, 0xca, 0x0D, 0xF0, 0xAD, 0xBA, 0x00, 0x11, 0x22, 0x33 }; // uint32_t key_w[44] = { 0 /*, ...*/ }; // uint32_t res_key_w[44] = { // 0xdeadbeef, 0xcafebabe, 0xbaadf00d, 0x33221100, // 0xbd6e2d6c, 0x779097d2, 0xcd3d67df, 0xfe1f76df, // 0x23d5ed56, 0x54457a84, 0x99781d5b, 0x67676b84, // 0x7c50682d, 0x281512a9, 0xb16d0ff2, 0xd60a6476, // 0x44a60f66, 0x6cb31dcf, 0xddde123d, 0x0bd4764b, // 0xf78d474e, 0x9b3e5a81, 0x46e048bc, 0x4d343ef7, // 0x9f6e5fdc, 0x0450055d, 0x42b04de1, 0x0f847316, // 0xd8180013, 0xdc48054e, 0x9ef848af, 0x917c3bb9, // 0x8e991071, 0x52d1153f, 0xcc295d90, 0x5d556629, // 0x2bd5ec59, 0x7904f966, 0xb52da4f6, 0xe878c2df, // 0xb54e504a, 0xcc4aa92c, 0x79670dda, 0x911fcf05, // }; // expandKey(key_b, key_w); // for (int i = 0; i < 44; i++) { // // printf("0x%08x, ", key_w[i]); // // if (i % 4 == 3) printf("\n"); // } // for (int i = 0; i < 44; i++) { // if (key_w[i] != res_key_w[i]) { // printf("Mismatch at key_w[%d]! Comparison interrupted.\n", i); test_failed = 1; // break; // } // } // printf("Testing addRoundKey\n"); // // test AddRoundKey (last round) // t_state state = { 0x01234567, 0x89abcdef, 0xdeadbeef, 0x00112233 }; // t_state res_state = { 0xb46d152d, 0x45e164c3, 0xa7cab335, 0x910eed36 }; // addRoundKey(state, key_w, 40); // printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", state[0], state[1], state[2], state[3]); // for (int i = 0; i < 4; i++) { // if (state[i] != res_state[i]) { printf("Mismatch at state[%d]!\n", i); } // } // } // // test aes encryption // printf("Testing aes\n"); // { // uint8_t key[16] = { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff }; // uint8_t in[16] = { 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67, 0x89 }; // uint8_t out[16] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; // uint8_t res[16] = { 0xa3, 0x3a, 0xca, 0x68, 0x72, 0xa2, 0x27, 0x74, 0xbf, 0x99, 0xf3, 0x71, 0xaa, 0x99, 0xd2, 0x5a }; // // printf("Key: "); // // hexprint16(key); // // puts(""); // // printf("In: "); // // hexprint16(in); // // puts(""); // uint32_t expKey[11 * 4]; // expandKey(key, expKey); // aes128(in, out, expKey); // // printf("Out: "); // // hexprint16(out); // // puts(""); // for (int i = 0; i < 16; i++) { // if (out[i] != res[i]) { printf("Mismatch at out[%02d]! 0x%02x 0x%02x\n", i, out[i], res[i]); test_failed = 1; } // } // } // if (test_failed) { // printf("|*********** SOME TEST(S) FAILED ***********|\n"); // printf("Please fix me!\n"); // } // else { // printf("============== All tests OK! ===============\n"); // } // return test_failed; // }