mirror of
https://github.com/markqvist/OpenModem.git
synced 2024-09-20 01:45:45 +00:00
361 lines
12 KiB
C
Executable File
361 lines
12 KiB
C
Executable File
/*
|
|
MIT License
|
|
|
|
Copyright (c) 2016 Andrew Carter
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
of this software and associated documentation files (the "Software"), to deal
|
|
in the Software without restriction, including without limitation the rights
|
|
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
copies of the Software, and to permit persons to whom the Software is
|
|
furnished to do so, subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included in all
|
|
copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
SOFTWARE.
|
|
|
|
Modifications copyright 2019 Mark Qvist
|
|
|
|
*/
|
|
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic ignored "-Wparentheses"
|
|
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
#include <avr/pgmspace.h>
|
|
|
|
#include "AES.h"
|
|
|
|
// Preprocessor Definitions
|
|
#define MAP(i,j) (((j) << 2) + (i))
|
|
#define MUL(x,y) aes_GaloisFieldMultiply((x),(y))
|
|
#define MUL2(x) (((x) << 1) ^ (0x1B & (((x) >> 7) * 0xFF))) & 0xFF
|
|
#define MUL3(x) ((x) ^ MUL2(x))
|
|
#define SUB4(x) (((uint32_t)pgm_read_byte(&(s_box[((x) & 0xFF000000) >> 24])) << 24) | ((uint32_t)pgm_read_byte(&(s_box[((x) & 0xFF0000) >> 16])) << 16) | (pgm_read_byte(&(s_box[((x) & 0xFF00) >> 8])) << 8) | pgm_read_byte(&(s_box[((x) & 0xFF)])))
|
|
|
|
// AES Tables
|
|
const uint8_t s_box[256] PROGMEM = {
|
|
0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
|
|
0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
|
|
0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
|
|
0x04, 0xC7, 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
|
|
};
|
|
|
|
const uint8_t s_box_inverse[256] PROGMEM = {
|
|
0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB,
|
|
0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB,
|
|
0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E,
|
|
0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25,
|
|
0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 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
|
|
};
|
|
|
|
const uint8_t rcon[10] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1B, 0x36 };
|
|
|
|
// AES Operation Definitions
|
|
|
|
void aes_Rotate (uint8_t block[4]);
|
|
void aes_SubBytes (uint8_t state[16]);
|
|
void aes_InvSubBytes (uint8_t state[16]);
|
|
void aes_ShiftRows (uint8_t state[16]);
|
|
void aes_InvShiftRows (uint8_t state[16]);
|
|
void aes_MixColumns (uint8_t state[16]);
|
|
void aes_InvMixColumns (uint8_t state[16]);
|
|
void aes_AddRoundKey (uint8_t state[16], uint8_t sub_key[16]);
|
|
|
|
// Maths Operation Definitions
|
|
|
|
uint8_t aes_GaloisFieldMultiply (uint8_t fixed, uint8_t variable);
|
|
|
|
// AES Core Procedures
|
|
|
|
void aes_init(uint32_t *round_key, counter b, uint32_t *key, counter n)
|
|
{
|
|
uint32_t t;
|
|
counter i, position, cycle;
|
|
|
|
memcpy(round_key, key, n * sizeof(uint32_t));
|
|
|
|
for (position = n, cycle = n, t = round_key[n - 1], i = 0; position < b; position++, cycle++) {
|
|
if (cycle == n) {
|
|
cycle = 0;
|
|
|
|
aes_Rotate((uint8_t *) &t);
|
|
t = SUB4(t);
|
|
((uint8_t *) &t)[0] ^= rcon[i++];
|
|
} else if (cycle == 4 && n == 8) {
|
|
t = SUB4(t);
|
|
}
|
|
|
|
t ^= round_key[position - n];
|
|
round_key[position] = t;
|
|
}
|
|
}
|
|
|
|
void aes_encrypt(uint8_t *round_key, uint8_t block[16], counter rounds)
|
|
{
|
|
counter i;
|
|
|
|
aes_AddRoundKey(block, round_key);
|
|
|
|
for (i = 1; i < rounds; i++) {
|
|
aes_SubBytes(block);
|
|
aes_ShiftRows(block);
|
|
aes_MixColumns(block);
|
|
aes_AddRoundKey(block, round_key + (i << 4));
|
|
}
|
|
|
|
aes_SubBytes(block);
|
|
aes_ShiftRows(block);
|
|
aes_AddRoundKey(block, round_key + (i << 4));
|
|
}
|
|
|
|
void aes_decrypt(uint8_t *round_key, uint8_t block[16], counter rounds)
|
|
{
|
|
counter i;
|
|
|
|
aes_AddRoundKey(block, round_key + (rounds << 4));
|
|
|
|
for (i = 1; i < rounds; i++) {
|
|
aes_InvShiftRows(block);
|
|
aes_InvSubBytes(block);
|
|
aes_AddRoundKey(block, round_key + ((rounds - i) << 4));
|
|
aes_InvMixColumns(block);
|
|
}
|
|
|
|
aes_InvShiftRows(block);
|
|
aes_InvSubBytes(block);
|
|
aes_AddRoundKey(block, round_key);
|
|
}
|
|
|
|
// AES Key Specific API
|
|
|
|
void aes_256_init(aes_256_context_t *context, uint8_t key[32])
|
|
{
|
|
aes_init((uint32_t *) context->round_key, sizeof(context->round_key) / sizeof(uint32_t), (uint32_t *) key, 8);
|
|
}
|
|
|
|
void aes_256_encrypt(aes_256_context_t *context, uint8_t block[16])
|
|
{
|
|
aes_encrypt(context->round_key, block, AES_256_ROUNDS);
|
|
}
|
|
|
|
void aes_256_decrypt(aes_256_context_t *context, uint8_t block[16])
|
|
{
|
|
aes_decrypt(context->round_key, block, AES_256_ROUNDS);
|
|
}
|
|
|
|
void aes_192_init(aes_192_context_t *context, uint8_t key[24])
|
|
{
|
|
aes_init((uint32_t *) context->round_key, sizeof(context->round_key) / sizeof(uint32_t), (uint32_t *) key, 6);
|
|
}
|
|
|
|
void aes_192_encrypt(aes_192_context_t *context, uint8_t block[16])
|
|
{
|
|
aes_encrypt(context->round_key, block, AES_192_ROUNDS);
|
|
}
|
|
|
|
void aes_192_decrypt(aes_192_context_t *context, uint8_t block[16])
|
|
{
|
|
aes_decrypt(context->round_key, block, AES_192_ROUNDS);
|
|
}
|
|
|
|
void aes_128_init(aes_128_context_t *context, uint8_t key[16])
|
|
{
|
|
aes_init((uint32_t *) context->round_key, sizeof(context->round_key) / sizeof(uint32_t), (uint32_t *) key, 4);
|
|
}
|
|
|
|
void aes_128_encrypt(aes_128_context_t *context, uint8_t block[16])
|
|
{
|
|
aes_encrypt(context->round_key, block, AES_128_ROUNDS);
|
|
}
|
|
|
|
void aes_128_decrypt(aes_128_context_t *context, uint8_t block[16])
|
|
{
|
|
aes_decrypt(context->round_key, block, AES_128_ROUNDS);
|
|
}
|
|
|
|
// AES Operation Implementations
|
|
|
|
void aes_Rotate(uint8_t block[4])
|
|
{
|
|
uint8_t tmp;
|
|
|
|
tmp = block[0];
|
|
block[0] = block[1];
|
|
block[1] = block[2];
|
|
block[2] = block[3];
|
|
block[3] = tmp;
|
|
}
|
|
|
|
void aes_SubBytes(uint8_t state[16])
|
|
{
|
|
counter i = 16;
|
|
|
|
while (i--) {
|
|
state[i] = pgm_read_byte(&(s_box[state[i]]));
|
|
}
|
|
}
|
|
|
|
void aes_InvSubBytes(uint8_t state[16])
|
|
{
|
|
counter i = 16;
|
|
|
|
while (i--) {
|
|
state[i] = pgm_read_byte(&(s_box_inverse[state[i]]));
|
|
}
|
|
}
|
|
|
|
void aes_ShiftRows(uint8_t state[16])
|
|
{
|
|
uint8_t tmp;
|
|
|
|
tmp = state[MAP(1,0)];
|
|
state[MAP(1,0)] = state[MAP(1,1)];
|
|
state[MAP(1,1)] = state[MAP(1,2)];
|
|
state[MAP(1,2)] = state[MAP(1,3)];
|
|
state[MAP(1,3)] = tmp;
|
|
|
|
tmp = state[MAP(2,0)];
|
|
state[MAP(2,0)] = state[MAP(2,2)];
|
|
state[MAP(2,2)] = tmp;
|
|
|
|
tmp = state[MAP(2,1)];
|
|
state[MAP(2,1)] = state[MAP(2,3)];
|
|
state[MAP(2,3)] = tmp;
|
|
|
|
tmp = state[MAP(3,0)];
|
|
state[MAP(3,0)] = state[MAP(3,3)];
|
|
state[MAP(3,3)] = state[MAP(3,2)];
|
|
state[MAP(3,2)] = state[MAP(3,1)];
|
|
state[MAP(3,1)] = tmp;
|
|
}
|
|
|
|
void aes_InvShiftRows(uint8_t state[16])
|
|
{
|
|
uint8_t tmp;
|
|
|
|
tmp = state[MAP(3,0)];
|
|
state[MAP(3,0)] = state[MAP(3,1)];
|
|
state[MAP(3,1)] = state[MAP(3,2)];
|
|
state[MAP(3,2)] = state[MAP(3,3)];
|
|
state[MAP(3,3)] = tmp;
|
|
|
|
tmp = state[MAP(2,0)];
|
|
state[MAP(2,0)] = state[MAP(2,2)];
|
|
state[MAP(2,2)] = tmp;
|
|
|
|
tmp = state[MAP(2,1)];
|
|
state[MAP(2,1)] = state[MAP(2,3)];
|
|
state[MAP(2,3)] = tmp;
|
|
|
|
tmp = state[MAP(1,0)];
|
|
state[MAP(1,0)] = state[MAP(1,3)];
|
|
state[MAP(1,3)] = state[MAP(1,2)];
|
|
state[MAP(1,2)] = state[MAP(1,1)];
|
|
state[MAP(1,1)] = tmp;
|
|
}
|
|
|
|
void aes_MixColumns(uint8_t state[16])
|
|
{
|
|
counter i = 4;
|
|
uint8_t new_state[4];
|
|
|
|
while (i--) {
|
|
new_state[0] = MUL2(state[MAP(0,i)]) ^ MUL3(state[MAP(1,i)]) ^ state[MAP(2,i)] ^ state[MAP(3,i)] ;
|
|
new_state[1] = state[MAP(0,i)] ^ MUL2(state[MAP(1,i)]) ^ MUL3(state[MAP(2,i)]) ^ state[MAP(3,i)] ;
|
|
new_state[2] = state[MAP(0,i)] ^ state[MAP(1,i)] ^ MUL2(state[MAP(2,i)]) ^ MUL3(state[MAP(3,i)]);
|
|
new_state[3] = MUL3(state[MAP(0,i)]) ^ state[MAP(1,i)] ^ state[MAP(2,i)] ^ MUL2(state[MAP(3,i)]);
|
|
|
|
state[MAP(0,i)] = new_state[0];
|
|
state[MAP(1,i)] = new_state[1];
|
|
state[MAP(2,i)] = new_state[2];
|
|
state[MAP(3,i)] = new_state[3];
|
|
}
|
|
}
|
|
|
|
void aes_InvMixColumns(uint8_t state[16])
|
|
{
|
|
counter i = 4;
|
|
uint8_t new_state[4];
|
|
|
|
while (i--) {
|
|
new_state[0] = MUL(14, state[MAP(0,i)]) ^ MUL(11, state[MAP(1,i)]) ^ MUL(13, state[MAP(2,i)]) ^ MUL( 9, state[MAP(3,i)]);
|
|
new_state[1] = MUL( 9, state[MAP(0,i)]) ^ MUL(14, state[MAP(1,i)]) ^ MUL(11, state[MAP(2,i)]) ^ MUL(13, state[MAP(3,i)]);
|
|
new_state[2] = MUL(13, state[MAP(0,i)]) ^ MUL( 9, state[MAP(1,i)]) ^ MUL(14, state[MAP(2,i)]) ^ MUL(11, state[MAP(3,i)]);
|
|
new_state[3] = MUL(11, state[MAP(0,i)]) ^ MUL(13, state[MAP(1,i)]) ^ MUL( 9, state[MAP(2,i)]) ^ MUL(14, state[MAP(3,i)]);
|
|
|
|
state[MAP(0,i)] = new_state[0];
|
|
state[MAP(1,i)] = new_state[1];
|
|
state[MAP(2,i)] = new_state[2];
|
|
state[MAP(3,i)] = new_state[3];
|
|
}
|
|
}
|
|
|
|
void aes_AddRoundKey(uint8_t state[16], uint8_t sub_key[16])
|
|
{
|
|
#ifdef OPTIMISE_8_BIT
|
|
|
|
counter i = 16;
|
|
|
|
while (i--) {
|
|
state[i] ^= sub_key[i];
|
|
}
|
|
|
|
#else
|
|
|
|
counter i = 4;
|
|
|
|
while (i--) {
|
|
((uint32_t *) state)[i] ^= ((uint32_t *) sub_key)[i];
|
|
}
|
|
|
|
#endif
|
|
}
|
|
|
|
// Maths Operation Implementations
|
|
|
|
uint8_t aes_GaloisFieldMultiply(uint8_t fixed, uint8_t variable)
|
|
{
|
|
uint8_t result = 0;
|
|
|
|
while (fixed) {
|
|
result ^= variable & ((fixed & 0x01) * 0xFF);
|
|
variable = MUL2(variable);
|
|
fixed >>= 1;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
#pragma GCC diagnostic pop |