162 lines
5.5 KiB
C++
162 lines
5.5 KiB
C++
#include <stdio.h>
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#include <stdint.h>
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/*
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Author: Ondrej Hladuvka, hladuond@fit.cvut.cz
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Template: Jiri Bucek 2017
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AES specification:
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http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
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*/
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namespace aes128_5a {
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/* AES Constants */
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// forward sbox
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const uint8_t SBOX[256] = {
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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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/* AES state type */
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typedef uint32_t t_state[4];
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void print(t_state t) {
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std::cout << t[0] << ' ' << t[1] << ' ' << t[2] << ' ' << t[3] << '\n';
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}
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#define word(a0, a1, a2, a3) ((uint32_t)(a0) | ((uint32_t)(a1) << 8) | ((uint32_t)(a2) << 16) | ((uint32_t)(a3) << 24))
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uint8_t wbyte(uint32_t w, int pos) {
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return (w >> (pos * 8)) & 0xff;
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}
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// **************** AES functions ****************
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uint32_t subWord(uint32_t w) {
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return word(SBOX[wbyte(w, 0)], SBOX[wbyte(w, 1)], SBOX[wbyte(w, 2)], SBOX[wbyte(w, 3)]);
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}
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void subBytes(t_state s) {
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unsigned char* p = reinterpret_cast<unsigned char*>(s);
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for (int i = 0; i < 16; ++i)
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p[i] = SBOX[p[i]];
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}
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void shiftRows(t_state s) {
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uint32_t tmp[4];
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tmp[0] = s[0] & 0x0000FF00;
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tmp[1] = s[1] & 0x0000FF00;
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tmp[2] = s[2] & 0x0000FF00;
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tmp[3] = s[3] & 0x0000FF00;
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s[0] = (s[0] & 0xFFFF00FF) | tmp[1];
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s[1] = (s[1] & 0xFFFF00FF) | tmp[2];
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s[2] = (s[2] & 0xFFFF00FF) | tmp[3];
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s[3] = (s[3] & 0xFFFF00FF) | tmp[0];
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tmp[0] = s[0] & 0x00FF0000;
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tmp[1] = s[1] & 0x00FF0000;
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tmp[2] = s[2] & 0x00FF0000;
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tmp[3] = s[3] & 0x00FF0000;
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s[0] = (s[0] & 0xFF00FFFF) | tmp[2];
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s[1] = (s[1] & 0xFF00FFFF) | tmp[3];
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s[2] = (s[2] & 0xFF00FFFF) | tmp[0];
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s[3] = (s[3] & 0xFF00FFFF) | tmp[1];
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tmp[0] = s[0] & 0xFF000000;
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tmp[1] = s[1] & 0xFF000000;
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tmp[2] = s[2] & 0xFF000000;
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tmp[3] = s[3] & 0xFF000000;
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s[0] = (s[0] & 0x00FFFFFF) | tmp[3];
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s[1] = (s[1] & 0x00FFFFFF) | tmp[0];
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s[2] = (s[2] & 0x00FFFFFF) | tmp[1];
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s[3] = (s[3] & 0x00FFFFFF) | tmp[2];
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}
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uint8_t xtime(uint8_t c) {
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uint8_t m = ((c & 0x80) >> 7) * 0x1B;
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return (c << 1) ^ m;
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}
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void mixColumns(t_state s) {
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for (int i = 0; i < 4; i++) {
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uint8_t a0 = wbyte(s[i], 0);
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uint8_t a1 = wbyte(s[i], 1);
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uint8_t a2 = wbyte(s[i], 2);
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uint8_t a3 = wbyte(s[i], 3);
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uint8_t r0 = xtime(a0) ^ xtime(a1) ^ a1 ^ a2 ^ a3;
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uint8_t r1 = xtime(a1) ^ xtime(a2) ^ a2 ^ a3 ^ a0;
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uint8_t r2 = xtime(a2) ^ xtime(a3) ^ a3 ^ a0 ^ a1;
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uint8_t r3 = xtime(a3) ^ xtime(a0) ^ a0 ^ a1 ^ a2;
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s[i] = word(r0, r1, r2, r3);
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}
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}
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/* Adding expanded round key (prepared before) */
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void addRoundKey(t_state s, uint32_t ek[], short index) {
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for (int i = 0; i < 4; i++) {
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s[i] ^= ek[index + i];
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}
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}
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void aes128_5(uint8_t *in, uint8_t *out, uint32_t * expKey) {
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t_state state;
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state[0] = word(in[0], in[1], in[2], in[3]);
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state[1] = word(in[4], in[5], in[6], in[7]);
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state[2] = word(in[8], in[9], in[10], in[11]);
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state[3] = word(in[12], in[13], in[14], in[15]);
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addRoundKey(state, expKey, 0);
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for (int round = 0; round < 9; ++round) {
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subBytes(state);
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shiftRows(state);
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mixColumns(state);
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addRoundKey(state, expKey, round * 4 + 4);
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}
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subBytes(state);
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shiftRows(state);
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addRoundKey(state, expKey, 10 * 4);
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out[0] = wbyte(state[0], 0);
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out[1] = wbyte(state[0], 1);
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out[2] = wbyte(state[0], 2);
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out[3] = wbyte(state[0], 3);
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out[4] = wbyte(state[1], 0);
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out[5] = wbyte(state[1], 1);
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out[6] = wbyte(state[1], 2);
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out[7] = wbyte(state[1], 3);
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out[8] = wbyte(state[2], 0);
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out[9] = wbyte(state[2], 1);
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out[10] = wbyte(state[2], 2);
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out[11] = wbyte(state[2], 3);
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out[12] = wbyte(state[3], 0);
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out[13] = wbyte(state[3], 1);
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out[14] = wbyte(state[3], 2);
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out[15] = wbyte(state[3], 3);
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}
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} |