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aes.cpp
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aes.cpp
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//- -----------------------------------------------------------------------------------------------------------------------
// AskSin++
// 2016-10-31 papa Creative Commons - http:https://creativecommons.org/licenses/by-nc-sa/3.0/de/
// adoption of Daniel Otte's cool AVR-Crypto-Lib, Copyright (C) 2008, GPLv3 or later
// cleaned and tidied to fit the purpose for AskSin++ by trilu
//- -----------------------------------------------------------------------------------------------------------------------
#include <string.h>
#include "aes.h"
#ifdef ARDUINO_ARCH_ESP32
#include <pgmspace.h>
#else
#include <avr/pgmspace.h>
#endif
const uint8_t aes_sbox[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 aes_invsbox[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
};
extern "C" uint8_t gf256mul(uint8_t a, uint8_t b, uint8_t reducer);
//- aes_enc.cpp
void aes_shiftcol(void *data, uint8_t shift){
uint8_t tmp[4];
tmp[0] = ((uint8_t*)data)[ 0];
tmp[1] = ((uint8_t*)data)[ 4];
tmp[2] = ((uint8_t*)data)[ 8];
tmp[3] = ((uint8_t*)data)[12];
((uint8_t*)data)[ 0] = tmp[(shift+0)&3];
((uint8_t*)data)[ 4] = tmp[(shift+1)&3];
((uint8_t*)data)[ 8] = tmp[(shift+2)&3];
((uint8_t*)data)[12] = tmp[(shift+3)&3];
}
void aes_enc_round(aes_cipher_state_t *state, const aes_roundkey_t *k){
uint8_t tmp[16], t;
uint8_t i;
/* subBytes */
for(i=0; i<16; ++i){
tmp[i] = pgm_read_byte(aes_sbox+state->s[i]);
}
/* shiftRows */
aes_shiftcol(tmp+1, 1);
aes_shiftcol(tmp+2, 2);
aes_shiftcol(tmp+3, 3);
/* mixColums */
for(i=0; i<4; ++i){
t = tmp[4*i+0] ^ tmp[4*i+1] ^ tmp[4*i+2] ^ tmp[4*i+3];
state->s[4*i+0] =
gf256mul(2, tmp[4 * i + 0] ^ tmp[4 * i + 1], 0x1b)
^ tmp[4*i+0]
^ t;
state->s[4*i+1] =
gf256mul(2, tmp[4 * i + 1] ^ tmp[4 * i + 2], 0x1b)
^ tmp[4*i+1]
^ t;
state->s[4 * i + 2] =
gf256mul(2, tmp[4 * i + 2] ^ tmp[4 * i + 3], 0x1b)
^ tmp[4*i+2]
^ t;
state->s[4*i+3] =
gf256mul(2, tmp[4 * i + 3] ^ tmp[4 * i + 0], 0x1b)
^ tmp[4*i+3]
^ t;
}
/* addKey */
for(i=0; i<16; ++i){
state->s[i] ^= k->ks[i];
}
}
void aes_enc_lastround(aes_cipher_state_t *state,const aes_roundkey_t *k){
uint8_t i;
/* subBytes */
for(i=0; i<16; ++i){
state->s[i] = pgm_read_byte(aes_sbox+state->s[i]);
}
/* shiftRows */
aes_shiftcol(state->s+1, 1);
aes_shiftcol(state->s+2, 2);
aes_shiftcol(state->s+3, 3);
/* keyAdd */
for(i=0; i<16; ++i){
state->s[i] ^= k->ks[i];
}
}
void aes_encrypt_core(aes_cipher_state_t *state, const aes_genctx_t *ks, uint8_t rounds){
uint8_t i;
for(i=0; i<16; ++i){
state->s[i] ^= ks->key[0].ks[i];
}
i=1;
for(;rounds>1;--rounds){
aes_enc_round(state, &(ks->key[i]));
++i;
}
aes_enc_lastround(state, &(ks->key[i]));
}
//- aes128_enc.cpp
void aes128_enc(void* buffer, aes128_ctx_t* ctx) {
aes_encrypt_core((aes_cipher_state_t*)buffer, (aes_genctx_t*)ctx, 10);
}
//- aes_dec.cpp
void aes_invshiftrow(void* data, uint8_t shift) {
uint8_t tmp[4];
tmp[0] = ((uint8_t*)data)[(4 + 0 - shift) & 3];
tmp[1] = ((uint8_t*)data)[(4 + 1 - shift) & 3];
tmp[2] = ((uint8_t*)data)[(4 + 2 - shift) & 3];
tmp[3] = ((uint8_t*)data)[(4 + 3 - shift) & 3];
memcpy(data, tmp, 4);
}
void aes_invshiftcol(void* data, uint8_t shift) {
uint8_t tmp[4];
tmp[0] = ((uint8_t*)data)[0];
tmp[1] = ((uint8_t*)data)[4];
tmp[2] = ((uint8_t*)data)[8];
tmp[3] = ((uint8_t*)data)[12];
((uint8_t*)data)[0] = tmp[(4 - shift + 0) & 3];
((uint8_t*)data)[4] = tmp[(4 - shift + 1) & 3];
((uint8_t*)data)[8] = tmp[(4 - shift + 2) & 3];
((uint8_t*)data)[12] = tmp[(4 - shift + 3) & 3];
}
void aes_dec_round(aes_cipher_state_t* state, const aes_roundkey_t* k) {
uint8_t tmp[16];
uint8_t i;
uint8_t t, u, v, w;
/* keyAdd */
for (i = 0; i < 16; ++i) {
tmp[i] = state->s[i] ^ k->ks[i];
}
/* mixColums */
for (i = 0; i < 4; ++i) {
t = tmp[4 * i + 3] ^ tmp[4 * i + 2];
u = tmp[4 * i + 1] ^ tmp[4 * i + 0];
v = t ^ u;
v = gf256mul(0x09, v, 0x1b);
w = v ^ gf256mul(0x04, tmp[4 * i + 2] ^ tmp[4 * i + 0], 0x1b);
v = v ^ gf256mul(0x04, tmp[4 * i + 3] ^ tmp[4 * i + 1], 0x1b);
state->s[4 * i + 3] = tmp[4 * i + 3] ^ v ^ gf256mul(0x02, tmp[4 * i + 0] ^ tmp[4 * i + 3], 0x1b);
state->s[4 * i + 2] = tmp[4 * i + 2] ^ w ^ gf256mul(0x02, t, 0x1b);
state->s[4 * i + 1] = tmp[4 * i + 1] ^ v ^ gf256mul(0x02, tmp[4 * i + 2] ^ tmp[4 * i + 1], 0x1b);
state->s[4 * i + 0] = tmp[4 * i + 0] ^ w ^ gf256mul(0x02, u, 0x1b);
}
/* shiftRows */
aes_invshiftcol(state->s + 1, 1);
aes_invshiftcol(state->s + 2, 2);
aes_invshiftcol(state->s + 3, 3);
/* subBytes */
for (i = 0; i < 16; ++i) {
state->s[i] = pgm_read_byte(aes_invsbox + state->s[i]);
}
}
void aes_dec_firstround(aes_cipher_state_t* state, const aes_roundkey_t* k) {
uint8_t i;
/* keyAdd */
for (i = 0; i < 16; ++i) {
state->s[i] ^= k->ks[i];
}
/* shiftRows */
aes_invshiftcol(state->s + 1, 1);
aes_invshiftcol(state->s + 2, 2);
aes_invshiftcol(state->s + 3, 3);
/* subBytes */
for (i = 0; i < 16; ++i) {
state->s[i] = pgm_read_byte(aes_invsbox + state->s[i]);
}
}
void aes_decrypt_core(aes_cipher_state_t* state, const aes_genctx_t* ks, uint8_t rounds) {
uint8_t i;
aes_dec_firstround(state, &(ks->key[i = rounds]));
for (; rounds > 1; --rounds) {
--i;
aes_dec_round(state, &(ks->key[i]));
}
for (i = 0; i < 16; ++i) {
state->s[i] ^= ks->key[0].ks[i];
}
}
//- aes128_dec.cpp
void aes128_dec(void* buffer, aes128_ctx_t* ctx) {
aes_decrypt_core((aes_cipher_state_t*)buffer, (aes_genctx_t*)ctx, 10);
}
//- aes_keyschedule.cpp
const uint8_t rc_tab[] PROGMEM = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36 };
void aes_rotword(void* a) {
uint8_t t;
t = ((uint8_t*)a)[0];
((uint8_t*)a)[0] = ((uint8_t*)a)[1];
((uint8_t*)a)[1] = ((uint8_t*)a)[2];
((uint8_t*)a)[2] = ((uint8_t*)a)[3];
((uint8_t*)a)[3] = t;
}
void aes_init(const void* key, uint16_t keysize_b, aes_genctx_t* ctx) {
uint8_t hi, i, nk, next_nk;
uint8_t rc = 0;
union {
uint32_t v32;
uint8_t v8[4];
} tmp;
nk = keysize_b >> 5; /* 4, 6, 8 */
hi = 4 * (nk + 6 + 1);
memcpy(ctx, key, keysize_b / 8);
next_nk = nk;
for (i = nk; i < hi; ++i) {
tmp.v32 = ((uint32_t*)(ctx->key[0].ks))[i - 1];
if (i != next_nk) {
if (nk == 8 && i % 8 == 4) {
tmp.v8[0] = pgm_read_byte(aes_sbox + tmp.v8[0]);
tmp.v8[1] = pgm_read_byte(aes_sbox + tmp.v8[1]);
tmp.v8[2] = pgm_read_byte(aes_sbox + tmp.v8[2]);
tmp.v8[3] = pgm_read_byte(aes_sbox + tmp.v8[3]);
}
}
else {
next_nk += nk;
aes_rotword(&(tmp.v32));
tmp.v8[0] = pgm_read_byte(aes_sbox + tmp.v8[0]);
tmp.v8[1] = pgm_read_byte(aes_sbox + tmp.v8[1]);
tmp.v8[2] = pgm_read_byte(aes_sbox + tmp.v8[2]);
tmp.v8[3] = pgm_read_byte(aes_sbox + tmp.v8[3]);
tmp.v8[0] ^= pgm_read_byte(rc_tab + rc);
rc++;
}
((uint32_t*)(ctx->key[0].ks))[i] = ((uint32_t*)(ctx->key[0].ks))[i - nk]
^ tmp.v32;
}
}
void aes128_init(const void* key, aes128_ctx_t* ctx) {
aes_init(key, 128, (aes_genctx_t*)ctx);
}
//- gf256mul
#ifdef ARDUINO_ARCH_AVR
asm volatile(
"#include <avr/io.h> \n"
"A = 23 \n" // param a: r24
"B = 22 \n" // param b: r22
"P = 24 \n" // param reducer: r20
".global gf256mul \n"
"gf256mul : \n"
"mov A, r24 \n"
"clr r24 \n"
" 1 : \n"
" lsr A \n"
" breq 4f \n"
" brcc 2f \n"
" eor P, B \n"
" 2 : \n"
" lsl B \n"
" brcc 3f \n"
" eor B, r20 \n"
" 3 : \n"
" rjmp 1b \n"
" 4 : \n"
" brcc 2f \n"
" eor P, B \n"
" 2 : \n"
" ret \n"
);
#else
extern "C" uint8_t gf256mul(uint8_t a, uint8_t b, uint8_t reducer) {
uint8_t i;
uint8_t p = 0, t;
for (i = 0; i < 8; ++i) {
if (b & 1)
p ^= a;
t = a & 0x80;
a <<= 1;
if (t)
a ^= reducer;
b >>= 1;
}
return p;
}
#endif