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/*
* crypto-tomgrypt.c - Cryptography routines needed by mrtreader using
* libtomcrypt.
*
* Copyright (C) 2014 Ruben Undheim <ruben.undheim@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <tomcrypt.h>
void mrtd_crypto_sha1(const uint8_t *input, const int length, uint8_t *output)
{
hash_state md;
sha1_init(&md);
sha1_process(&md, (const unsigned char*) input, length);
sha1_done(&md, output);
}
void mrtd_crypto_crypt_des(const uint8_t *input, uint8_t *output, const int length, const uint8_t *key, const char encrypt)
{
int err;
symmetric_CBC cbc_state;
char IV[8];
memset(IV,0,8);
if(register_cipher(&des_desc) == -1){
printf("Error registering cipher\n");
}
if((err = cbc_start(find_cipher("des"),IV,key,8,0,&cbc_state)) != CRYPT_OK){
printf("cbc_start error: %s\n", error_to_string(err));
}
if(encrypt){
if((err = cbc_encrypt(input,output,length,&cbc_state)) != CRYPT_OK){
printf("cbc_encrypt error: %s\n", error_to_string(err));
}
}
else{
if((err = cbc_decrypt(input,output,length,&cbc_state)) != CRYPT_OK){
printf("cbc_encrypt error: %s\n", error_to_string(err));
}
}
if((err = cbc_done(&cbc_state)) != CRYPT_OK){
printf("cbc_done error: %s\n", error_to_string(err));
}
}
void mrtd_crypto_encrypt_des(const uint8_t *input, uint8_t *output, const int length, const uint8_t *key)
{
mrtd_crypto_crypt_des(input,output,length,key,1);
}
void mrtd_crypto_decrypt_des(const uint8_t *input, uint8_t *output, const int length, const uint8_t *key)
{
mrtd_crypto_crypt_des(input,output,length,key,0);
}
void mrtd_crypto_crypt_3des(const uint8_t *input, uint8_t *output, const int length, const uint8_t *key, const char encrypt)
{
int err;
symmetric_CBC cbc_state;
char longkey[24];
char IV[8];
memcpy(longkey,key,16);
memcpy(longkey+16,key,8);
memset(IV,0,8);
if(register_cipher(&des3_desc) == -1){
printf("Error registering cipher\n");
exit(-1);
}
if((err = cbc_start(find_cipher("3des"),IV,longkey,24,0,&cbc_state)) != CRYPT_OK){
printf("cbc_start error: %s\n", error_to_string(err));
exit(-1);
}
if(encrypt){
if((err = cbc_encrypt(input,output,length,&cbc_state)) != CRYPT_OK){
printf("cbc_encrypt error: %s\n", error_to_string(err));
exit(-1);
}
}
else{
if((err = cbc_decrypt(input,output,length,&cbc_state)) != CRYPT_OK){
printf("cbc_encrypt error: %s\n", error_to_string(err));
exit(-1);
}
}
}
void mrtd_crypto_encrypt_3des(const uint8_t *input, uint8_t *output, const int length, const uint8_t *key)
{
mrtd_crypto_crypt_3des(input,output,length,key,1);
}
void mrtd_crypto_decrypt_3des(const uint8_t *input, uint8_t *output, const int length, const uint8_t *key)
{
mrtd_crypto_crypt_3des(input,output,length,key,0);
}
void mrtd_crypto_fix_parity(const uint8_t *input, uint8_t *output, const int length, int *newlength)
{
int i,j;
unsigned char y;
int parity;
*newlength = length+(length/8);
for(i=0;i<length;i++){
y = input[i] & 0xfe;
parity = 0;
for(j=0;j<8;j++){
parity += y >> j & 1;
}
if(parity % 2 == 0){
output[i] = (char)(y + 1);
}
else{
output[i] = y;
}
}
}
void mrtd_crypto_padding(const uint8_t *input, uint8_t *output, const int length, int *newlength)
{
*newlength = ((length+8)/8)*8;
memset(output,0,*newlength);
memcpy(output,input,length);
output[length] = 0x80;
}
void mrtd_crypto_padding_remove(const uint8_t *input, uint8_t *output, const int length, int *newlength)
{
int i;
int pos;
char found = 0;
for(i=length-1;i>=0;i--){
if(input[i] == 0x00) {
continue;
}
else if(input[i] == 0x80) {
pos = i;
found = 1;
break;
}
else {
goto failed;
}
}
if(found){
*newlength = pos;
memcpy(output,input,*newlength);
}
else{
goto failed;
}
return;
failed:
*newlength = 0;
return;
}
void mrtd_crypto_mac(const uint8_t *input, uint8_t *output, const int length, const uint8_t *key)
{
int i,j;
uint8_t current[8];
uint8_t mac[8];
uint8_t xormac[8];
uint8_t tmp[8];
memset(mac,0,8);
for(i=0;i<(length/8);i++){
for(j=0;j<8;j++){
current[j] = input[i*8+j];
}
for(j=0;j<8;j++){
xormac[j] = mac[j] ^ current[j];
}
mrtd_crypto_encrypt_des(xormac,mac,8,key);
}
mrtd_crypto_decrypt_des(mac,tmp,8,key+8);
mrtd_crypto_encrypt_des(tmp,output,8,key);
}
void mrtd_crypto_mac_padding(const uint8_t *input, uint8_t *output, const int length, const uint8_t *key)
{
int newlength;
uint8_t *tmp;
tmp = malloc(((length+8)/8)*8);
mrtd_crypto_padding(input,tmp,length,&newlength);
mrtd_crypto_mac(tmp,output,newlength,key);
free(tmp);
}
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