[Crypto] Added AES-128
This commit is contained in:
jgromes
parent
f513226376
commit
ca319c9c0b
3 changed files with 468 additions and 0 deletions
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@ -112,6 +112,7 @@
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// utilities
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#include "utils/CRC.h"
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#include "utils/Cryptography.h"
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// only create Radio class when using RadioShield
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#if defined(RADIOLIB_RADIOSHIELD)
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294
src/utils/Cryptography.cpp
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294
src/utils/Cryptography.cpp
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@ -0,0 +1,294 @@
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#include "Cryptography.h"
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#include <string.h>
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RadioLibAES128::RadioLibAES128() {
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}
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void RadioLibAES128::init(uint8_t* key) {
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this->keyPtr = key;
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this->keyExpansion(this->roundKey, key);
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}
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size_t RadioLibAES128::encryptECB(uint8_t* in, size_t len, uint8_t* out) {
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size_t num_blocks = len / RADIOLIB_AES128_BLOCK_SIZE;
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if(len % RADIOLIB_AES128_BLOCK_SIZE) {
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num_blocks++;
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}
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memset(out, 0x00, RADIOLIB_AES128_BLOCK_SIZE * num_blocks);
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memcpy(out, in, len);
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for(size_t i = 0; i < num_blocks; i++) {
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this->cipher((state_t*)(out + (RADIOLIB_AES128_BLOCK_SIZE * i)), this->roundKey);
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}
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return(num_blocks*RADIOLIB_AES128_BLOCK_SIZE);
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}
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size_t RadioLibAES128::decryptECB(uint8_t* in, size_t len, uint8_t* out) {
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size_t num_blocks = len / RADIOLIB_AES128_BLOCK_SIZE;
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if(len % RADIOLIB_AES128_BLOCK_SIZE) {
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num_blocks++;
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}
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memset(out, 0x00, RADIOLIB_AES128_BLOCK_SIZE * num_blocks);
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memcpy(out, in, len);
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for(size_t i = 0; i < num_blocks; i++) {
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this->decipher((state_t*)(out + (RADIOLIB_AES128_BLOCK_SIZE * i)), this->roundKey);
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}
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return(num_blocks*RADIOLIB_AES128_BLOCK_SIZE);
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}
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void RadioLibAES128::generateCMAC(uint8_t* in, size_t len, uint8_t* cmac) {
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uint8_t key1[RADIOLIB_AES128_BLOCK_SIZE];
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uint8_t key2[RADIOLIB_AES128_BLOCK_SIZE];
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this->generateSubkeys(key1, key2);
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size_t num_blocks = len / RADIOLIB_AES128_BLOCK_SIZE;
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bool flag = true;
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if(len % RADIOLIB_AES128_BLOCK_SIZE) {
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num_blocks++;
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flag = false;
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}
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uint8_t* buff = new uint8_t[num_blocks * RADIOLIB_AES128_BLOCK_SIZE];
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memset(buff, 0, num_blocks * RADIOLIB_AES128_BLOCK_SIZE);
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memcpy(buff, in, len);
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if (flag) {
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this->blockXor(&buff[(num_blocks - 1)*RADIOLIB_AES128_BLOCK_SIZE], &buff[(num_blocks - 1)*RADIOLIB_AES128_BLOCK_SIZE], key1);
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} else {
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buff[len] = 0x80;
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this->blockXor(&buff[(num_blocks - 1)*RADIOLIB_AES128_BLOCK_SIZE], &buff[(num_blocks - 1)*RADIOLIB_AES128_BLOCK_SIZE], key2);
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}
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uint8_t X[] = {
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00
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};
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uint8_t Y[RADIOLIB_AES128_BLOCK_SIZE];
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for(uint8_t i = 0; i < num_blocks - 1; i++) {
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this->blockXor(Y, &buff[i*RADIOLIB_AES128_BLOCK_SIZE], X);
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this->encryptECB(Y, RADIOLIB_AES128_BLOCK_SIZE, X);
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}
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this->blockXor(Y, &buff[(num_blocks - 1)*RADIOLIB_AES128_BLOCK_SIZE], X);
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this->encryptECB(Y, RADIOLIB_AES128_BLOCK_SIZE, cmac);
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delete[] buff;
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}
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bool RadioLibAES128::verifyCMAC(uint8_t* in, size_t len, uint8_t* cmac) {
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uint8_t cmacReal[RADIOLIB_AES128_BLOCK_SIZE];
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this->generateCMAC(in, len, cmacReal);
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for(size_t i = 0; i < RADIOLIB_AES128_BLOCK_SIZE; i++) {
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if((cmacReal[i] != cmac[i])) {
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return(false);
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}
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}
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return(true);
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}
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void RadioLibAES128::keyExpansion(uint8_t* roundKey, uint8_t* key) {
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uint8_t tmp[4];
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// the first round key is the key itself
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for(uint8_t i = 0; i < RADIOLIB_AES128_N_K; i++) {
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for(uint8_t j = 0; j < 4; j++) {
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roundKey[(i * 4) + j] = key[(i * 4) + j];
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}
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}
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// All other round keys are found from the previous round keys.
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for(uint8_t i = RADIOLIB_AES128_N_K; i < RADIOLIB_AES128_N_B * (RADIOLIB_AES128_N_R + 1); ++i) {
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uint8_t j = (i - 1) * 4;
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for(uint8_t k = 0; k < 4; k++) {
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tmp[k] = roundKey[j + k];
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}
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if(i % RADIOLIB_AES128_N_K == 0) {
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this->rotWord(tmp);
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this->subWord(tmp);
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tmp[0] = tmp[0] ^ aesRcon[i/RADIOLIB_AES128_N_K];
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}
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j = i * 4;
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uint8_t k = (i - RADIOLIB_AES128_N_K) * 4;
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for(uint8_t l = 0; l < 4; l++) {
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roundKey[j + l] = roundKey[k + l] ^ tmp[l];
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}
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}
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}
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void RadioLibAES128::cipher(state_t* state, uint8_t* roundKey) {
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this->addRoundKey(0, state, roundKey);
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for(uint8_t round = 1; round < RADIOLIB_AES128_N_R; round++) {
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this->subBytes(state, aesSbox);
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this->shiftRows(state, false);
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this->mixColumns(state, false);
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this->addRoundKey(round, state, roundKey);
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}
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this->subBytes(state, aesSbox);
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this->shiftRows(state, false);
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this->addRoundKey(RADIOLIB_AES128_N_R, state, roundKey);
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}
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void RadioLibAES128::decipher(state_t* state, uint8_t* roundKey) {
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this->addRoundKey(RADIOLIB_AES128_N_R, state, roundKey);
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for(uint8_t round = RADIOLIB_AES128_N_R - 1; round > 0; --round) {
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this->shiftRows(state, true);
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this->subBytes(state, aesSboxInv);
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this->addRoundKey(round, state, roundKey);
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this->mixColumns(state, true);
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}
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this->shiftRows(state, true);
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this->subBytes(state, aesSboxInv);
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this->addRoundKey(0, state, roundKey);
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}
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void RadioLibAES128::subWord(uint8_t* word) {
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for(size_t i = 0; i < 4; i++) {
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word[i] = RADIOLIB_NONVOLATILE_READ_BYTE(&aesSbox[word[i]]);
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}
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}
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void RadioLibAES128::rotWord(uint8_t* word) {
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uint8_t tmp[4];
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memcpy(tmp, word, 4);
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for(size_t i = 0; i < 4; i++) {
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word[i] = tmp[(i + 1) % 4];
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}
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}
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void RadioLibAES128::addRoundKey(uint8_t round, state_t* state, uint8_t* roundKey) {
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for(size_t row = 0; row < 4; row++) {
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for(size_t col = 0; col < 4; col++) {
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(*state)[row][col] ^= roundKey[(round * RADIOLIB_AES128_N_B * 4) + (row * RADIOLIB_AES128_N_B) + col];
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}
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}
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}
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void RadioLibAES128::blockXor(uint8_t* dst, uint8_t* a, uint8_t* b) {
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for(uint8_t j = 0; j < RADIOLIB_AES128_BLOCK_SIZE; j++) {
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dst[j] = a[j] ^ b[j];
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}
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}
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void RadioLibAES128::blockLeftshift(uint8_t* dst, uint8_t* src) {
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uint8_t ovf = 0x00;
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for(int8_t i = RADIOLIB_AES128_BLOCK_SIZE - 1; i >= 0; i--) {
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dst[i] = src[i] << 1;
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dst[i] |= ovf;
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ovf = (src[i] & 0x80) ? 1 : 0;
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}
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}
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void RadioLibAES128::generateSubkeys(uint8_t* key1, uint8_t* key2) {
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uint8_t const_Zero[] = {
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00
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};
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uint8_t const_Rb[] = {
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x87
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};
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uint8_t L[RADIOLIB_AES128_BLOCK_SIZE];
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this->encryptECB(const_Zero, RADIOLIB_AES128_BLOCK_SIZE, L);
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this->blockLeftshift(key1, L);
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if(L[0] & 0x80) {
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this->blockXor(key1, key1, const_Rb);
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}
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this->blockLeftshift(key2, key1);
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if(key1[0] & 0x80) {
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this->blockXor(key2, key2, const_Rb);
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}
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}
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void RadioLibAES128::subBytes(state_t* state, const uint8_t* box) {
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for(size_t row = 0; row < 4; row++) {
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for(size_t col = 0; col < 4; col++) {
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(*state)[col][row] = box[(*state)[col][row]];
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}
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}
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}
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void RadioLibAES128::shiftRows(state_t* state, bool inv) {
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uint8_t tmp[4];
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for(size_t row = 1; row < 4; row++) {
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for(size_t col = 0; col < 4; col++) {
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if(!inv) {
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tmp[col] = (*state)[(row + col) % 4][row];
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} else {
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tmp[(row + col) % 4] = (*state)[col][row];
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}
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}
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for(size_t col = 0; col < 4; col++) {
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(*state)[col][row] = tmp[col];
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}
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}
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}
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void RadioLibAES128::mixColumns(state_t* state, bool inv) {
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uint8_t tmp[4];
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uint8_t matmul[][4] = {
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0x02, 0x03, 0x01, 0x01,
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0x01, 0x02, 0x03, 0x01,
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0x01, 0x01, 0x02, 0x03,
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0x03, 0x01, 0x01, 0x02
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};
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if(inv) {
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uint8_t matmul_inv[][4] = {
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0x0e, 0x0b, 0x0d, 0x09,
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0x09, 0x0e, 0x0b, 0x0d,
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0x0d, 0x09, 0x0e, 0x0b,
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0x0b, 0x0d, 0x09, 0x0e
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};
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memcpy(matmul, matmul_inv, sizeof(matmul_inv));
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}
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for(size_t col = 0; col < 4; col++) {
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for(size_t row = 0; row < 4; row++) {
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tmp[row] = (*state)[col][row];
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}
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for(size_t i = 0; i < 4; i++) {
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(*state)[col][i] = 0x00;
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for(size_t j = 0; j < 4; j++) {
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(*state)[col][i] ^= mul(matmul[i][j], tmp[j]);
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}
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}
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}
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}
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uint8_t RadioLibAES128::mul(uint8_t a, uint8_t b) {
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uint8_t sb[4];
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uint8_t out = 0;
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sb[0] = b;
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for(size_t i = 1; i < 4; i++) {
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sb[i] = sb[i - 1] << 1;
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if (sb[i - 1] & 0x80) {
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sb[i] ^= 0x1b;
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}
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}
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for(size_t i = 0; i < 4; i++) {
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if(a >> i & 0x01) {
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out ^= sb[i];
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}
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}
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return(out);
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}
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RadioLibAES128 RadioLibAES128Instance;
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173
src/utils/Cryptography.h
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173
src/utils/Cryptography.h
Normal file
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#if !defined(_RADIOLIB_CRYPTOGRAPHY_H)
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#define _RADIOLIB_CRYPTOGRAPHY_H
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#include "../TypeDef.h"
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#include "../Module.h"
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// AES-128 constants
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#define RADIOLIB_AES128_BLOCK_SIZE (16)
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#define RADIOLIB_AES128_N_K ((RADIOLIB_AES128_BLOCK_SIZE) / sizeof(uint32_t))
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#define RADIOLIB_AES128_N_B (4)
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#define RADIOLIB_AES128_N_R (10)
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#define RADIOLIB_AES128_KEY_EXP_SIZE (176)
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// helper type
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typedef uint8_t state_t[4][4];
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// AES lookup tables
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static const uint8_t aesSbox[] RADIOLIB_NONVOLATILE = {
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0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5,
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0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
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0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0,
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0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
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0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc,
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0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
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0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a,
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0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
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0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0,
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0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
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0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b,
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0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
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0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85,
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0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
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0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5,
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0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
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0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17,
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0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
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0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88,
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0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
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0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c,
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0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
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0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9,
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0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
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0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6,
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0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
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0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e,
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0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
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0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94,
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0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
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0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68,
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0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
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};
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static const uint8_t aesSboxInv[] RADIOLIB_NONVOLATILE = {
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0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38,
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0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
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0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87,
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0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
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0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d,
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0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
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0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2,
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0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
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0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16,
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0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
|
||||
0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda,
|
||||
0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
|
||||
0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a,
|
||||
0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
|
||||
0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02,
|
||||
0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
|
||||
0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea,
|
||||
0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
|
||||
0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85,
|
||||
0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
|
||||
0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89,
|
||||
0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
|
||||
0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20,
|
||||
0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
|
||||
0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31,
|
||||
0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
|
||||
0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d,
|
||||
0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
|
||||
0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0,
|
||||
0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
|
||||
0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26,
|
||||
0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d
|
||||
};
|
||||
|
||||
static const uint8_t aesRcon[] = { 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36 };
|
||||
|
||||
/*!
|
||||
\class RadioLibAES128
|
||||
Most of the implementation here is adapted from https://github.com/kokke/tiny-AES-c
|
||||
Additional code and CMAC calculation is from https://github.com/megrxu/AES-CMAC
|
||||
\brief Class to perform AES encryption, decryption and CMAC.
|
||||
*/
|
||||
class RadioLibAES128 {
|
||||
public:
|
||||
/*!
|
||||
\brief Default constructor.
|
||||
*/
|
||||
RadioLibAES128();
|
||||
|
||||
/*!
|
||||
\brief Initialize the AES.
|
||||
\param key AES key to use.
|
||||
*/
|
||||
void init(uint8_t* key);
|
||||
|
||||
/*!
|
||||
\brief Perform ECB-type AES encryption.
|
||||
\param in Input plaintext data (unpadded).
|
||||
\param len Length of the input data.
|
||||
\param out Buffer to save the output ciphertext into. It is up to the caller
|
||||
to ensure the buffer is sufficiently large to save the data!
|
||||
\returns The number of bytes saved into the output buffer.
|
||||
*/
|
||||
size_t encryptECB(uint8_t* in, size_t len, uint8_t* out);
|
||||
|
||||
/*!
|
||||
\brief Perform ECB-type AES decryption.
|
||||
\param in Input ciphertext data.
|
||||
\param len Length of the input data.
|
||||
\param out Buffer to save the output plaintext into. It is up to the caller
|
||||
to ensure the buffer is sufficiently large to save the data!
|
||||
\returns The number of bytes saved into the output buffer.
|
||||
*/
|
||||
size_t decryptECB(uint8_t* in, size_t len, uint8_t* out);
|
||||
|
||||
/*!
|
||||
\brief Calculate message authentication code according to RFC4493.
|
||||
\param in Input data (unpadded).
|
||||
\param len Length of the input data.
|
||||
\param cmac Buffer to save the output MAC into. The buffer must be at least 16 bytes long!
|
||||
*/
|
||||
void generateCMAC(uint8_t* in, size_t len, uint8_t* cmac);
|
||||
|
||||
/*!
|
||||
\brief Verify the recevied CMAC. This just calculates the CMAC again and compares the results.
|
||||
\param in Input data (unpadded).
|
||||
\param len Length of the input data.
|
||||
\param cmac CMAC to verify.
|
||||
\returns True if valid, false otherwise.
|
||||
*/
|
||||
bool verifyCMAC(uint8_t* in, size_t len, uint8_t* cmac);
|
||||
|
||||
private:
|
||||
uint8_t* keyPtr;
|
||||
uint8_t roundKey[RADIOLIB_AES128_KEY_EXP_SIZE];
|
||||
|
||||
void keyExpansion(uint8_t* roundKey, uint8_t* key);
|
||||
void cipher(state_t* state, uint8_t* roundKey);
|
||||
void decipher(state_t* state, uint8_t* roundKey);
|
||||
|
||||
void subWord(uint8_t* word);
|
||||
void rotWord(uint8_t* word);
|
||||
|
||||
void addRoundKey(uint8_t round, state_t* state, uint8_t* roundKey);
|
||||
|
||||
void blockXor(uint8_t* dst, uint8_t* a, uint8_t* b);
|
||||
void blockLeftshift(uint8_t* dst, uint8_t* src);
|
||||
void generateSubkeys(uint8_t* key1, uint8_t* key2);
|
||||
|
||||
void subBytes(state_t* state, const uint8_t* box);
|
||||
void shiftRows(state_t* state, bool inv);
|
||||
void mixColumns(state_t* state, bool inv);
|
||||
|
||||
uint8_t mul(uint8_t a, uint8_t b);
|
||||
};
|
||||
|
||||
// the global singleton
|
||||
extern RadioLibAES128 RadioLibAES128Instance;
|
||||
|
||||
#endif
|
||||
Loading…
Add table
Reference in a new issue