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/*
* MPQCryptography.c
* MPQKit
*
* Created by Jean-Francois Roy on Sat Oct 05 2002.
* Copyright (c) 2002-2007 MacStorm. All rights reserved.
*
*/
#include <assert.h>
#include <string.h>
#include <zlib.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/md5.h>
#include <openssl/obj_mac.h>
#include <openssl/sha.h>
#include "MPQCryptography.h"
#include "inttypes.h"
static int crypt_table_initialized = 0;
static uint32_t crypt_table[0x500];
/****TODO****/
/* Re-implement various endianess fixes. */
static void memrev(unsigned char *buf, size_t count)
{
unsigned char *r;
for (r = buf + count - 1; buf < r; buf++, r--) {
*buf ^= *r;
*r ^= *buf;
*buf ^= *r;
}
}
const uint32_t *__mpqlib_get_cryptography_table()
{
assert(crypt_table_initialized);
return crypt_table;
}
void __mpqlib_init_cryptography()
{
// Prepare crypt_table
uint32_t seed = 0x00100001;
uint32_t index1 = 0;
uint32_t index2 = 0;
int32_t i;
if (!crypt_table_initialized) {
crypt_table_initialized = 1;
for (index1 = 0; index1 < 0x100; index1++) {
for (index2 = index1, i = 0; i < 5; i++, index2 += 0x100) {
uint32_t temp1, temp2;
seed = (seed * 125 + 3) % 0x2AAAAB;
temp1 = (seed & 0xFFFF) << 0x10;
seed = (seed * 125 + 3) % 0x2AAAAB;
temp2 = (seed & 0xFFFF);
crypt_table[index2] = (temp1 | temp2);
}
}
}
// Load up OpenSSL
OpenSSL_add_all_digests();
OpenSSL_add_all_algorithms();
OpenSSL_add_all_ciphers();
ERR_load_crypto_strings();
}
void __mpqlib_encrypt(void *_data, uint32_t length, uint32_t key, bool disable_input_swapping)
{
char * data = (char *) _data;
assert(crypt_table_initialized);
assert(data);
uint32_t *buffer32 = (uint32_t *) data;
uint32_t seed = 0xEEEEEEEE;
uint32_t ch;
// Round to 4 bytes
length = length / 4;
// We duplicate the loop to avoid costly branches
if (disable_input_swapping) {
while (length-- > 0) {
seed += crypt_table[0x400 + (key & 0xFF)];
ch = *buffer32 ^ (key + seed);
key = ((~key << 0x15) + 0x11111111) | (key >> 0x0B);
seed = *buffer32 + seed + (seed << 5) + 3;
*buffer32++ = ch;
}
} else {
while (length-- > 0) {
seed += crypt_table[0x400 + (key & 0xFF)];
ch = *buffer32 ^ (key + seed);
key = ((~key << 0x15) + 0x11111111) | (key >> 0x0B);
seed = *buffer32 + seed + (seed << 5) + 3;
*buffer32++ = ch;
}
}
}
void __mpqlib_decrypt(void *_data, uint32_t length, uint32_t key, bool disable_output_swapping)
{
char * data = (char *) _data;
assert(crypt_table_initialized);
assert(data);
uint32_t *buffer32 = (uint32_t *) data;
uint32_t seed = 0xEEEEEEEE;
uint32_t ch;
// Round to 4 bytes
length = length / 4;
if (disable_output_swapping) {
while (length-- > 0) {
ch = *buffer32;
seed += crypt_table[0x400 + (key & 0xFF)];
ch = ch ^ (key + seed);
key = ((~key << 0x15) + 0x11111111) | (key >> 0x0B);
seed = ch + seed + (seed << 5) + 3;
*buffer32++ = ch;
}
} else {
while (length-- > 0) {
ch = *buffer32;
seed += crypt_table[0x400 + (key & 0xFF)];
ch = ch ^ (key + seed);
key = ((~key << 0x15) + 0x11111111) | (key >> 0x0B);
seed = ch + seed + (seed << 5) + 3;
*buffer32++ = ch;
}
}
}
uint32_t __mpqlib_hash_cstring(const char *string, uint32_t type)
{
assert(crypt_table_initialized);
assert(string);
uint32_t seed1 = 0x7FED7FED;
uint32_t seed2 = 0xEEEEEEEE;
uint32_t shifted_type = (type << 8);
int32_t ch;
while (*string != 0) {
ch = *string++;
if (ch > 0x60 && ch < 0x7b)
ch -= 0x20;
seed1 = crypt_table[shifted_type + ch] ^ (seed1 + seed2);
seed2 = ch + seed1 + seed2 + (seed2 << 5) + 3;
}
return seed1;
}
uint32_t __mpqlib_hash_data(const char *data, uint32_t length, uint32_t type)
{
assert(crypt_table_initialized);
assert(data);
uint32_t seed1 = 0x7FED7FED;
uint32_t seed2 = 0xEEEEEEEE;
uint32_t shifted_type = (type << 8);
int32_t ch;
while (length > 0) {
ch = *data++;
seed1 = crypt_table[shifted_type + ch] ^ (seed1 + seed2);
seed2 = ch + seed1 + seed2 + (seed2 << 5) + 3;
length--;
}
return seed1;
}
void __mpqlib_crc32(const unsigned char *buffer, uint32_t length, uint32_t * crc, uint32_t flags)
{
uint32_t local_crc = 0;
const uint32_t *crc_table = (uint32_t *) get_crc_table();
const unsigned char *buffer_end = buffer + length;
if (crc)
local_crc = *crc;
if (flags & __MPQLIB_CRC_INIT)
local_crc = 0xFFFFFFFF;
if (flags & __MPQLIB_CRC_UPDATE) {
while (buffer < buffer_end) {
local_crc = ((local_crc >> 8) & 0x00FFFFFF) ^ crc_table[(local_crc ^ *buffer) & 0xFF];
buffer++;
}
}
if (flags & __MPQLIB_CRC_FINALIZE)
local_crc = local_crc ^ 0xFFFFFFFF;
if (crc)
*crc = local_crc;
}
int __mpqlib_verify_weak_signature(RSA * public_key, const unsigned char *signature, const unsigned char *digest)
{
unsigned char reversed_signature[__MPQLIB_WEAK_SIGNATURE_SIZE];
memcpy(reversed_signature, signature + 8, __MPQLIB_WEAK_SIGNATURE_SIZE);
memrev(reversed_signature, __MPQLIB_WEAK_SIGNATURE_SIZE);
return RSA_verify(NID_md5, digest, MD5_DIGEST_LENGTH, reversed_signature, __MPQLIB_WEAK_SIGNATURE_SIZE, public_key);
}
int __mpqlib_verify_strong_signature(RSA * public_key, const unsigned char *signature, const unsigned char *digest)
{
unsigned char reversed_signature[__MPQLIB_STRONG_SIGNATURE_SIZE];
memcpy(reversed_signature, signature + 4, __MPQLIB_STRONG_SIGNATURE_SIZE);
memrev(reversed_signature, __MPQLIB_STRONG_SIGNATURE_SIZE);
unsigned char real_digest[__MPQLIB_STRONG_SIGNATURE_SIZE];
memset(real_digest, 0xbb, sizeof(real_digest));
real_digest[0] = 0x0b;
uint32_t digest_offset = sizeof(real_digest) - SHA_DIGEST_LENGTH;
memcpy(real_digest + digest_offset, digest, SHA_DIGEST_LENGTH);
memrev(real_digest + digest_offset, SHA_DIGEST_LENGTH);
RSA_public_decrypt(__MPQLIB_STRONG_SIGNATURE_SIZE, reversed_signature, reversed_signature, public_key, RSA_NO_PADDING);
unsigned long error = ERR_get_error();
return (!error && memcmp(reversed_signature, real_digest, __MPQLIB_STRONG_SIGNATURE_SIZE) == 0);
}
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