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Incognito_RCM/source/keys/AES128.c
James Tophoven 2a3b4c0ec3 test aes_xts decryption III
2019-09-23 17:09:44 +02:00

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/* ============================================================================================================ *
2012036901 - 윤진한
주 의 사 항
1. 주석으로 표현된 구현 블록 0에서 12번까지 구현하여 128비트 AES 암호화 알고리즘을 구현해야 함
2. AES128(...) 함수의 호출과 리턴이 여러번 반복되더라도 메모리 누수가 생기지 않게 함
3. AddRoundKey 함수를 구현할 때에도 파라미터 rKey는 사전에 선언된 지역 배열을 가리키도록 해야 함
(정확한 구현을 위해서는 포인터 개념의 이해가 필요함)
4. 배열의 인덱스 계산시 아래에 정의된 KEY_SIZE, ROUNDKEY_SIZE, BLOCK_SIZE를 이용해야 함
(상수 그대로 사용하면 안됨. 예로, 4, 16는 안되고 KEY_SIZE/4, BLOCK_SIZE로 사용해야 함)
* ============================================================================================================ */
#include <stdio.h>
#include <stdlib.h>
#include "AES128.h"
#define KEY_SIZE 16
#define ROUNDKEY_SIZE 176
#define BLOCK_SIZE 16
/*********************************************** { 구현 0 시작 } ********************************************/
static const uint8_t ori_sbox[256] = {
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 };
static const uint8_t inv_sbox[256] = {
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 };
static const uint8_t rcon[256] = {
0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a,
0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39,
0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a,
0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8,
0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef,
0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc,
0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b,
0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3,
0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94,
0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20,
0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35,
0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f,
0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04,
0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63,
0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd,
0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d };
static const uint8_t matrix[16] = {
0x02, 0x03, 0x01, 0x01,
0x01, 0x02, 0x03, 0x01,
0x01, 0x01, 0x02, 0x03,
0x03, 0x01, 0x01, 0x02 };
static const uint8_t inv_matrix[16] = {
0x0E, 0x0B, 0x0D, 0x09,
0x09, 0x0E, 0x0B, 0x0D,
0x0D, 0x09, 0x0E, 0x0B,
0x0B, 0x0D, 0x09, 0x0E };
// Additional Fuction - Galois field mutiplication.
BYTE GF_Mutiplication(uint8_t num,BYTE data){
int i;
BYTE tmp = 0;
BYTE mask = 0x01;
for (i = 0;i < num;i ++){
if (num & mask){
tmp ^= data;
}
if (data & 0x80){
data = (data << 1) ^ 0x1b;
} else {
data <<= 1;
}
mask <<= 1;
}
return tmp;
}// Galois field mutiplication function.
/*********************************************** { 구현 0 종료 } ********************************************/
/* <키스케줄링 함수>
*
* key 키스케줄링을 수행할 16바이트 키
* roundKey 키스케줄링의 결과인 176바이트 라운드키가 담길 공간
*/
void expandKey(BYTE *key, BYTE *roundKey){
/*********************************************** { 구현 1 시작 } ********************************************/
int i,j,k,roundKey_filled = 0;
BYTE tmp,gkey[4],tmp_key[4][4];
for (i = 0;i < KEY_SIZE/4;i ++){
for (j = 0;j < KEY_SIZE/4;j ++){
tmp_key[i][j] = *(key + i*4 + j);
*(roundKey + (roundKey_filled++)) = tmp_key[i][j];
}
}// The first round key is the original key itself.
for (i = 1;i < ROUNDKEY_SIZE/KEY_SIZE;i ++){
for (j = 0;j < KEY_SIZE/4 ;j ++){
gkey[j] = tmp_key[3][j];
}
tmp = gkey[0];
for (j = 0;j < KEY_SIZE/4 - 1 ;j ++){
gkey[j] = gkey[j + 1];
}
gkey[KEY_SIZE/4 - 1] = tmp;
// Shift left 1 bit.
for (j = 0;j < KEY_SIZE/4 ;j ++){
gkey[j] = ori_sbox[ gkey[j] ];
}// Sub ori_sbox.
gkey[0] ^= rcon[i];
// XOR with rcon matrix.
for (j = 0;j < KEY_SIZE/4 ;j ++){
tmp_key[0][j] ^= gkey[j];
}// XOR gkey.
for (j = 1;j < KEY_SIZE/4 ;j ++){
for (k = 0;k < KEY_SIZE/4 ;k ++){
tmp_key[j][k] ^= tmp_key[j-1][k];
}
}// Make round key.
for (j = 0;j < KEY_SIZE/4 ;j ++){
for (k = 0;k < KEY_SIZE/4 ;k ++){
*(roundKey + (roundKey_filled++)) = tmp_key[j][k];
}
}// Insert calculated key into RoundKey.
}
/*********************************************** { 구현 1 종료 } ********************************************/
}
/* <SubBytes 함수>
*
* block SubBytes 수행할 16바이트 블록. 수행 결과는 해당 배열에 바로 반영
* mode SubBytes 수행 모드
*/
BYTE* subBytes(BYTE *block, int mode){
/* 필요하다 생각하면 추가 선언 */
int i;
switch(mode){
case ENC:
/*********************************************** { 구현 2 시작 } ********************************************/
for (i = 0;i < BLOCK_SIZE;i ++){
*(block + i) = ori_sbox[ *(block + i) ];
}// SubByte ori_sbox.
/*********************************************** { 구현 2 종료 } ********************************************/
break;
case DEC:
/*********************************************** { 구현 3 시작 } ********************************************/
for (i = 0;i < BLOCK_SIZE;i ++){
*(block + i) = inv_sbox[ *(block + i) ];
}// SubByte inv_sbox.
/*********************************************** { 구현 3 종료 } ********************************************/
break;
default:
fprintf(stderr, "Invalid mode!\n");
exit(1);
}
return block;
}
/* <ShiftRows 함수>
*
* block ShiftRows 수행할 16바이트 블록. 수행 결과는 해당 배열에 바로 반영
* mode ShiftRows 수행 모드
*/
BYTE* shiftRows(BYTE *block, int mode){
/* 필요하다 생각하면 추가 선언 */
int i,j,rep;
BYTE tmp;
switch(mode){
case ENC:
/*********************************************** { 구현 4 시작 } ********************************************/
for (i = 1; i < BLOCK_SIZE/4;i ++){
for (rep = i;rep >= 1;rep --){
tmp = *(block + i);
for (j = i; j < (i + BLOCK_SIZE - BLOCK_SIZE/4) ;j += 4){
*(block + j) = *(block + j + BLOCK_SIZE/4);
}
*(block + i + BLOCK_SIZE - BLOCK_SIZE/4) = tmp;
}
}
// 1 left Shift 2nd Col, 2 left Shift 3rd Col, 3 left Shift 4th Col.
/*********************************************** { 구현 4 종료 } ********************************************/
break;
case DEC:
/*********************************************** { 구현 5 시작 } ********************************************/
for (i = 1; i < BLOCK_SIZE/4;i ++){
for (rep = i;rep >= 1;rep --){
tmp = *(block + i + BLOCK_SIZE - BLOCK_SIZE/4);
for (j = i + BLOCK_SIZE - BLOCK_SIZE/4; j >= i ;j -= 4){
*(block + j) = *(block + j - BLOCK_SIZE/4);
}
*(block + i) = tmp;
}
}
// 1 right Shift 2nd Col, 2 right Shift 3rd Col, 3 right Shift 4th Col.
/*********************************************** { 구현 5 종료 } ********************************************/
break;
default:
fprintf(stderr, "Invalid mode!\n");
exit(1);
}
return block;
}
/* <MixColumns 함수>
*
* block MixColumns을 수행할 16바이트 블록. 수행 결과는 해당 배열에 바로 반영
* mode MixColumns의 수행 모드
*/
BYTE* mixColumns(BYTE *block, int mode){
/* 필요하다 생각하면 추가 선언 */
int i,j,k;
BYTE tmp[16] = {0,};
BYTE tmp2[4][4];
for (i=0;i<4;i++){ for (j=0;j<4;j++){ tmp2[i][j] = *(block+i*4+j); } }
for (i=0;i<4;i++){ for (j=0;j<4;j++){ *(block+i*4+j) = tmp2[j][i]; } }
switch(mode){
case ENC:
/*********************************************** { 구현 6 시작 } ********************************************/
for (i = 0;i < BLOCK_SIZE/4 ;i ++){
for (j = 0;j < BLOCK_SIZE/4 ;j ++){
for (k = 0;k < BLOCK_SIZE/4 ;k ++){
tmp[ i*4 +j ] ^= GF_Mutiplication(matrix[ i*4 + k ],*(block + k*4 + j));
}
}
}// Galois field mutiplication data with matirx.
/*********************************************** { 구현 6 종료 } ********************************************/
break;
case DEC:
/*********************************************** { 구현 7 시작 } ********************************************/
for (i = 0;i < BLOCK_SIZE/4 ;i ++){
for (j = 0;j < BLOCK_SIZE/4 ;j ++){
for (k = 0;k < BLOCK_SIZE/4 ;k ++){
tmp[ i*4 +j ] ^= GF_Mutiplication(inv_matrix[ i*4 + k],*(block + k*4 + j));
}
}
}// Galois field mutiplication data with inv_matirx.
/*********************************************** { 구현 7 종료 } ********************************************/
break;
default:
fprintf(stderr, "Invalid mode!\n");
exit(1);
}
for (i=0;i<4;i++){ for (j=0;j<4;j++){ tmp2[i][j] = tmp[i*4+j]; } }
for (i = 0;i <BLOCK_SIZE/4 ;i ++){
for (j = 0;j < BLOCK_SIZE/4 ;j ++){
*(block + i*4 + j) = tmp2[j][i];
}
}// change origin block to calculated tmp.
return block;
}
/* <AddRoundKey 함수>
*
* block AddRoundKey를 수행할 16바이트 블록. 수행 결과는 해당 배열에 반영
* rKey AddRoundKey를 수행할 16바이트 라운드키
*/
BYTE* addRoundKey(BYTE *block, BYTE *rKey){
/*********************************************** { 구현 8 시작 } ********************************************/
int i,j;
for (i = 0 ; i < BLOCK_SIZE/4 ; i++){
for (j = i ; j < BLOCK_SIZE ; j+=4){
*(block + j) ^= *(rKey + j);
}
}// XOR Calculate origin block data with RoundKey.
/*********************************************** { 구현 8 종료 } ********************************************/
return block;
}
/* <128비트 AES 암호화 함수>
*
* plain 바이트 배열로 구성된 평문 (16바이트 고정)
* key 128비트 암호키 (16바이트)
*
* @ret 암호화된 암호문
*/
BYTE* encrypt(BYTE *plain, BYTE *key){
BYTE roundKey[ROUNDKEY_SIZE];
/*********************************************** { 구현 9 시작 } ********************************************/
int round;
for (round = 0; round <= 10; round ++){
if (round == 0){ // initial round of encryption.
expandKey(key,roundKey);
addRoundKey(plain,roundKey);
} else if (round == 10){ // final round of encryption.
subBytes(plain,ENC);
shiftRows(plain,ENC);
addRoundKey(plain,roundKey + round*KEY_SIZE);
} else { // 9 main rounds of encryption.
subBytes(plain,ENC);
shiftRows(plain,ENC);
mixColumns(plain,ENC);
addRoundKey(plain,roundKey + round*KEY_SIZE);
}
}
return plain;
/*********************************************** { 구현 9 종료 } ********************************************/
}
/* <128비트 AES 복호화 함수>
*
* cipher 바이트 배열로 구성된 평문 (16바이트 고정)
* key 128비트 암호키 (16바이트)
*
* @ret 복호화된 평문
*/
BYTE* decrypt(BYTE *cipher, BYTE *key){
BYTE roundKey[ROUNDKEY_SIZE];
/*********************************************** { 구현 10 시작 } ********************************************/
int round;
for (round = 10; round >=0; round --){
if (round == 0){ // final round of encryption.
shiftRows(cipher,DEC);
subBytes(cipher,DEC);
addRoundKey(cipher,roundKey);
} else if (round == 10){ // initial round of encryption.
expandKey(key,roundKey);
addRoundKey(cipher,roundKey + round*KEY_SIZE);
} else { // 9 main rounds of encryption.
shiftRows(cipher,DEC);
subBytes(cipher,DEC);
addRoundKey(cipher,roundKey + round*KEY_SIZE);
mixColumns(cipher,DEC);
}
}
return cipher;
/*********************************************** { 구현 10 종료 } ********************************************/
}
/* <128비트 AES 암복호화 함수>
*
* mode가 ENC일 경우 평문을 암호화하고, DEC일 경우 암호문을 복호화하는 함수
*
* [ENC 모드]
* plain 평문 바이트 배열
* cipher 결과(암호문)이 담길 바이트 배열. 호출하는 사용자가 사전에 메모리를 할당하여 파라미터로 넘김
* key 128비트 암호키 (16바이트)
*
* [DEC 모드]
* plain 결과(평문)가 담길 바이트 배열. 호출하는 사용자가 사전에 메모리를 할당하여 파라미터로 넘김
* cipher 암호문 바이트 배열
* key 128비트 암호키 (16바이트)
*/
void AES128(BYTE *plain, BYTE *cipher, BYTE *key, int mode){
BYTE *tmp;
if(mode == ENC){
tmp = encrypt(plain, key);
/*********************************************** { 구현 11 시작 } ********************************************/
for (int i = 0; i < BLOCK_SIZE ; i ++){
*(cipher + i) = *(tmp + i);
}// copy tmp blocks to ciper blocks.
/*********************************************** { 구현 11 종료 } ********************************************/
}else if(mode == DEC){
tmp = decrypt(cipher, key);
/*********************************************** { 구현 12 시작 } ********************************************/
for (int i = 0; i < BLOCK_SIZE ; i ++){
*(plain + i) = *(tmp + i);
}// copy tmp blocks to plain blocks.
/*********************************************** { 구현 12 종료 } ********************************************/
}else{
fprintf(stderr, "Invalid mode!\n");
exit(1);
}
}
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