377 lines
13 KiB
C++
377 lines
13 KiB
C++
#include <stdio.h>
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#include <stdint.h>
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/* AES-128 simple implementation template and testing */
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/*
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Author: Manuel Thalmann, thalmman@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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/* AES Constants */
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// AES polynomial
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const uint16_t POLYNOMIAL = 0b100011011;
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// forward sbox
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const uint8_t SBOX[256] = {
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0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
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0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
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0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
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0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
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0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
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0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
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0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
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0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
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0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
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0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
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0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
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0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
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0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
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0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
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0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
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0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
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};
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const uint8_t rCon[12] = {
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0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36,
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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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/* Helper functions */
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void hexprint16(uint8_t *p) {
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for (int i = 0; i < 16; i++)
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printf("%02hhx ", p[i]);
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puts("");
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}
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void hexprintw(uint32_t w) {
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for (int i = 0; i < 32; i += 8)
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printf("%02hhx ", (w >> i) & 0xffU);
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}
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void hexprintws(uint32_t * p, int cnt) {
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for (int i = 0; i < cnt; i++)
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hexprintw(p[i]);
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puts("");
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}
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void printstate(t_state s) {
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hexprintw(s[0]);
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hexprintw(s[1]);
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hexprintw(s[2]);
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hexprintw(s[3]);
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puts("");
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}
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uint32_t word(uint8_t a0, uint8_t a1, uint8_t a2, uint8_t a3) {
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return a0 | (uint32_t)a1 << 8 | (uint32_t)a2 << 16 | (uint32_t)a3 << 24;
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}
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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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for (uint8_t i = 0; i < 4; i++) {
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s[i] = subWord(s[i]);
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}
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}
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void shiftRows(t_state s) {
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for (uint8_t i = 0; i < 4; i++) {
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uint32_t mask = 0xFF << (i * 8);
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for (uint8_t shiftCount = 0; shiftCount < i; shiftCount++) {
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for (uint8_t currentByte = 0; currentByte < 3; currentByte++) {
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// Swap s[currentByte] and s[currentByte + 1]
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s[currentByte] = s[currentByte] ^ (mask & s[currentByte + 1]);
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s[currentByte + 1] = s[currentByte + 1] ^ (mask & s[currentByte]);
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s[currentByte] = s[currentByte] ^ (mask & s[currentByte + 1]);
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}
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}
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}
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}
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uint8_t xtime(uint8_t a) {
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uint8_t mask;
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if (a & 0b10000000) {
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mask = POLYNOMIAL & 0xFF;
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}
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else {
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mask = 0x00;
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}
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return ((a << 1) ^ mask) & 0xFF;
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}
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// not mandatory - mix a single column
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uint32_t mixColumn(uint32_t c) {
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uint32_t result = c;
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uint8_t *source = (uint8_t*)(&c);
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uint8_t *target = (uint8_t*)(&result);
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uint8_t base = *source ^ *(source + 1) ^ *(source + 2) ^ *(source + 3);
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*target ^= base ^ xtime(*source ^ *(source + 1));
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*(target + 1) ^= base ^ xtime(*(source + 1) ^ *(source + 2));
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*(target + 2) ^= base ^ xtime(*(source + 2) ^ *(source + 3));
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*(target + 3) ^= base ^ xtime(*(source + 3) ^ *source);
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return result;
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}
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void mixColumns(t_state s) {
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for (uint8_t i = 0; i < 4; i++) {
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s[i] = mixColumn(s[i]);
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}
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}
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/*
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* Key expansion from 128bits (4*32b)
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* to 11 round keys (11*4*32b)
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* each round key is 4*32b
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*/
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// Taken from: https://www.brainkart.com/article/AES-Key-Expansion_8410/
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void expandKey(uint8_t k[16], uint32_t ek[44]) {
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for (uint8_t i = 0; i < 4; i++) {
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ek[i] = word(k[i * 4], k[i * 4 + 1], k[i * 4 + 2], k[i * 4 + 3]);
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}
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for (uint8_t i = 4; i < 44; i++) {
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uint32_t key = ek[i - 1];
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if (i % 4 == 0) {
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key = (key >> 8) | (key << 24);
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key = subWord(key) ^ rCon[i / 4];
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}
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ek[i] = ek[i - 4] ^ key;
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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 round) {
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s[0] ^= ek[round];
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s[1] ^= ek[round + 1];
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s[2] ^= ek[round + 2];
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s[3] ^= ek[round + 3];
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}
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void aes(uint8_t *in, uint8_t *out, uint8_t *skey)
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{
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//... Initialize ...
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unsigned short round = 0;
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t_state state;
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for (uint8_t i = 0; i < 4; i++) {
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state[i] = word(in[i * 4], in[i * 4 + 1], in[i * 4 + 2], in[i * 4 + 3]);
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}
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printf("IN: "); printstate(state);
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uint32_t expKey[11 * 4];
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expandKey(skey, expKey);
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for (int i = 0; i < 11; i++) {
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printf("K%02d: ", i);
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hexprintws(expKey + 4 * i, 4);
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}
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addRoundKey(state, expKey, 0);
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printf("ARK: "); printstate(state);
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for (int i = 1; i <= 10; i++) {
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subBytes(state);
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printf("SB: ");
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printstate(state);
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shiftRows(state);
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printf("SR: ");
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printstate(state);
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if (i < 10) {
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mixColumns(state);
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printf("MC: ");
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printstate(state);
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}
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addRoundKey(state, expKey, 4*i);
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printf("ARK: ");
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printstate(state);
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}
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for (int i = 0; i < 16; i++) {
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if (i < 4) out[i] = wbyte(state[0], i % 4);
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else if (i < 8) out[i] = wbyte(state[1], i % 4);
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else if (i < 12) out[i] = wbyte(state[2], i % 4);
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else out[i] = wbyte(state[3], i % 4);
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}
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}
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//****************************
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// MAIN function: AES testing
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//****************************
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int main(int argc, char* argv[])
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{
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int test_failed = 0;
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// test subBytes
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printf("Testing subBytes\n");
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{
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t_state state = { 0x01234567, 0x89abcdef, 0xdeadbeef, 0x00112233 };
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t_state res_state = { 0x7c266e85, 0xa762bddf, 0x1d95aedf, 0x638293c3 };
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subBytes(state);
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printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", state[0], state[1], state[2], state[3]);
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for (int i = 0; i < 4; i++) {
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if (state[i] != res_state[i]) { printf("Mismatch at state[%d]!\n", i); test_failed = 1; }
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}
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}
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// test shiftRows
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printf("Testing shiftRows\n");
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{
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t_state state = { 0x01234567, 0x89abcdef, 0xdeadbeef, 0x00112233 };
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t_state res_state = { 0x00adcd67, 0x0111beef, 0x892322ef, 0xdeab4533 };
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shiftRows(state);
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printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", state[0], state[1], state[2], state[3]);
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for (int i = 0; i < 4; i++) {
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if (state[i] != res_state[i]) { printf("Mismatch at state[%d]!\n", i); test_failed = 1; }
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}
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}
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// test mixColumns
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printf("Testing mixColumns\n");
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{
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t_state state = { 0x01234567, 0x89abcdef, 0xdeadbeef, 0x00112233 };
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t_state res_state = { 0xcd678923, 0x45ef01ab, 0x9e69ba6f, 0x66334411 };
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mixColumns(state);
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printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", state[0], state[1], state[2], state[3]);
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for (int i = 0; i < 4; i++) {
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if (state[i] != res_state[i]) { printf("Mismatch at state[%d]!\n", i); test_failed = 1; }
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}
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}
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// test xtime
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printf("Testing xtime\n");
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{
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uint8_t res[256] = { 0x00, 0x02, 0x04, 0x06, 0x08, 0x0a, 0x0c, 0x0e, 0x10, 0x12,
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0x14, 0x16, 0x18, 0x1a, 0x1c, 0x1e, 0x20, 0x22, 0x24, 0x26,
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0x28, 0x2a, 0x2c, 0x2e, 0x30, 0x32, 0x34, 0x36, 0x38, 0x3a,
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0x3c, 0x3e, 0x40, 0x42, 0x44, 0x46, 0x48, 0x4a, 0x4c, 0x4e,
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0x50, 0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e, 0x60, 0x62,
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0x64, 0x66, 0x68, 0x6a, 0x6c, 0x6e, 0x70, 0x72, 0x74, 0x76,
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0x78, 0x7a, 0x7c, 0x7e, 0x80, 0x82, 0x84, 0x86, 0x88, 0x8a,
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0x8c, 0x8e, 0x90, 0x92, 0x94, 0x96, 0x98, 0x9a, 0x9c, 0x9e,
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0xa0, 0xa2, 0xa4, 0xa6, 0xa8, 0xaa, 0xac, 0xae, 0xb0, 0xb2,
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0xb4, 0xb6, 0xb8, 0xba, 0xbc, 0xbe, 0xc0, 0xc2, 0xc4, 0xc6,
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0xc8, 0xca, 0xcc, 0xce, 0xd0, 0xd2, 0xd4, 0xd6, 0xd8, 0xda,
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0xdc, 0xde, 0xe0, 0xe2, 0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xee,
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0xf0, 0xf2, 0xf4, 0xf6, 0xf8, 0xfa, 0xfc, 0xfe, 0x1b, 0x19,
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0x1f, 0x1d, 0x13, 0x11, 0x17, 0x15, 0x0b, 0x09, 0x0f, 0x0d,
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0x03, 0x01, 0x07, 0x05, 0x3b, 0x39, 0x3f, 0x3d, 0x33, 0x31,
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0x37, 0x35, 0x2b, 0x29, 0x2f, 0x2d, 0x23, 0x21, 0x27, 0x25,
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0x5b, 0x59, 0x5f, 0x5d, 0x53, 0x51, 0x57, 0x55, 0x4b, 0x49,
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0x4f, 0x4d, 0x43, 0x41, 0x47, 0x45, 0x7b, 0x79, 0x7f, 0x7d,
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0x73, 0x71, 0x77, 0x75, 0x6b, 0x69, 0x6f, 0x6d, 0x63, 0x61,
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0x67, 0x65, 0x9b, 0x99, 0x9f, 0x9d, 0x93, 0x91, 0x97, 0x95,
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0x8b, 0x89, 0x8f, 0x8d, 0x83, 0x81, 0x87, 0x85, 0xbb, 0xb9,
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0xbf, 0xbd, 0xb3, 0xb1, 0xb7, 0xb5, 0xab, 0xa9, 0xaf, 0xad,
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0xa3, 0xa1, 0xa7, 0xa5, 0xdb, 0xd9, 0xdf, 0xdd, 0xd3, 0xd1,
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0xd7, 0xd5, 0xcb, 0xc9, 0xcf, 0xcd, 0xc3, 0xc1, 0xc7, 0xc5,
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0xfb, 0xf9, 0xff, 0xfd, 0xf3, 0xf1, 0xf7, 0xf5, 0xeb, 0xe9,
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0xef, 0xed, 0xe3, 0xe1, 0xe7, 0xe5 };
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for (uint16_t i = 0; i < 256; i++) {
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//printf("0x%02hhx, ", xtime((uint8_t)i));
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if (xtime((uint8_t)i)!=res[i]) {
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printf("\nMismatch at xtime(0x%02x)! Comparison interrupted.\n", i); test_failed = 1;
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break;
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}
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}
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puts("");
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}
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// test key expansion
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printf("Testing expandKey\n");
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{
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uint8_t key_b[16] = { 0xef, 0xbe, 0xad, 0xde, 0xbe, 0xba, 0xfe, 0xca, 0x0D, 0xF0, 0xAD, 0xBA, 0x00, 0x11, 0x22, 0x33 };
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uint32_t key_w[44] = { 0 /*, ...*/ };
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uint32_t res_key_w[44] = {
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0xdeadbeef, 0xcafebabe, 0xbaadf00d, 0x33221100,
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0xbd6e2d6c, 0x779097d2, 0xcd3d67df, 0xfe1f76df,
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0x23d5ed56, 0x54457a84, 0x99781d5b, 0x67676b84,
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0x7c50682d, 0x281512a9, 0xb16d0ff2, 0xd60a6476,
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0x44a60f66, 0x6cb31dcf, 0xddde123d, 0x0bd4764b,
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0xf78d474e, 0x9b3e5a81, 0x46e048bc, 0x4d343ef7,
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0x9f6e5fdc, 0x0450055d, 0x42b04de1, 0x0f847316,
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0xd8180013, 0xdc48054e, 0x9ef848af, 0x917c3bb9,
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0x8e991071, 0x52d1153f, 0xcc295d90, 0x5d556629,
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0x2bd5ec59, 0x7904f966, 0xb52da4f6, 0xe878c2df,
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0xb54e504a, 0xcc4aa92c, 0x79670dda, 0x911fcf05,
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};
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expandKey(key_b, key_w);
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for (int i = 0; i < 44; i++) {
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printf("0x%08x, ", key_w[i]);
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if (i % 4 == 3) printf("\n");
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}
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for (int i = 0; i < 44; i++) {
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if (key_w[i] != res_key_w[i]) {
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printf("Mismatch at key_w[%d]! Comparison interrupted.\n", i); test_failed = 1;
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break;
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}
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}
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printf("Testing addRoundKey\n");
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// test AddRoundKey (last round)
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t_state state = { 0x01234567, 0x89abcdef, 0xdeadbeef, 0x00112233 };
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t_state res_state = { 0xb46d152d, 0x45e164c3, 0xa7cab335, 0x910eed36 };
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addRoundKey(state, key_w, 40);
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printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", state[0], state[1], state[2], state[3]);
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for (int i = 0; i < 4; i++) {
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if (state[i] != res_state[i]) { printf("Mismatch at state[%d]!\n", i); }
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}
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}
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// test aes encryption
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printf("Testing aes\n");
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{
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uint8_t key[16] = { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff };
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uint8_t in[16] = { 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67, 0x89};
|
|
uint8_t out[16] = { 0, /*...*/ };
|
|
uint8_t res_out[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("");
|
|
|
|
aes(in, out, key);
|
|
|
|
printf("Out: ");
|
|
hexprint16(out);
|
|
puts("");
|
|
|
|
for (int i = 0; i < 16; i++) {
|
|
if (out[i] != res_out[i]) { printf("Mismatch at out[%d]!\n", 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;
|
|
}
|