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323 lines
7 KiB
C++
323 lines
7 KiB
C++
/*************************************************************************/
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/* file_access_encrypted.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* http://www.godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "file_access_encrypted.h"
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#include "aes256.h"
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#include "md5.h"
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#include "os/copymem.h"
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#include "print_string.h"
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#define COMP_MAGIC 0x43454447
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#include "core/variant.h"
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#include <stdio.h>
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Error FileAccessEncrypted::open_and_parse(FileAccess *p_base,const Vector<uint8_t>& p_key,Mode p_mode) {
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//print_line("open and parse!");
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ERR_FAIL_COND_V(file!=NULL,ERR_ALREADY_IN_USE);
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ERR_FAIL_COND_V(p_key.size()!=32,ERR_INVALID_PARAMETER);
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pos=0;
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eofed=false;
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if (p_mode==MODE_WRITE_AES256) {
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data.clear();
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writing=true;
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file=p_base;
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mode=p_mode;
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key=p_key;
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} else if (p_mode==MODE_READ) {
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writing=false;
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key=p_key;
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uint32_t magic = p_base->get_32();
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print_line("MAGIC: "+itos(magic));
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ERR_FAIL_COND_V(magic!=COMP_MAGIC,ERR_FILE_UNRECOGNIZED);
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mode=Mode(p_base->get_32());
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ERR_FAIL_INDEX_V(mode,MODE_MAX,ERR_FILE_CORRUPT);
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ERR_FAIL_COND_V(mode==0,ERR_FILE_CORRUPT);
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print_line("MODE: "+itos(mode));
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unsigned char md5d[16];
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p_base->get_buffer(md5d,16);
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length=p_base->get_64();
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base=p_base->get_pos();
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ERR_FAIL_COND_V(p_base->get_len() < base+length, ERR_FILE_CORRUPT );
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int ds = length;
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if (ds % 16) {
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ds+=16-(ds % 16);
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}
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data.resize(ds);
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int blen = p_base->get_buffer(data.ptr(),ds);
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ERR_FAIL_COND_V(blen!=ds,ERR_FILE_CORRUPT);
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aes256_context ctx;
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aes256_init(&ctx,key.ptr());
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for(size_t i=0;i<ds;i+=16) {
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aes256_decrypt_ecb(&ctx,&data[i]);
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}
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aes256_done(&ctx);
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data.resize(length);
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MD5_CTX md5;
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MD5Init(&md5);
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MD5Update(&md5,data.ptr(),data.size());
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MD5Final(&md5);
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ERR_FAIL_COND_V(String::md5(md5.digest)!=String::md5(md5d),ERR_FILE_CORRUPT) ;
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file=p_base;
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}
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return OK;
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}
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Error FileAccessEncrypted::open_and_parse_password(FileAccess *p_base,const String& p_key,Mode p_mode){
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String cs = p_key.md5_text();
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ERR_FAIL_COND_V(cs.length()!=32,ERR_INVALID_PARAMETER);
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Vector<uint8_t> key;
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key.resize(32);
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for(int i=0;i<32;i++) {
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key[i]=cs[i];
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}
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return open_and_parse(p_base,key,p_mode);
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}
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Error FileAccessEncrypted::_open(const String& p_path, int p_mode_flags) {
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return OK;
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}
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void FileAccessEncrypted::close() {
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if (!file)
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return;
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if (writing) {
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Vector<uint8_t> compressed;
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size_t len = data.size();
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if (len % 16) {
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len+=16-(len % 16);
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}
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MD5_CTX md5;
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MD5Init(&md5);
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MD5Update(&md5,data.ptr(),data.size());
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MD5Final(&md5);
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compressed.resize(len);
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zeromem( compressed.ptr(), len );
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for(int i=0;i<data.size();i++) {
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compressed[i]=data[i];
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}
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aes256_context ctx;
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aes256_init(&ctx,key.ptr());
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for(size_t i=0;i<len;i+=16) {
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aes256_encrypt_ecb(&ctx,&compressed[i]);
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}
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aes256_done(&ctx);
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file->store_32(COMP_MAGIC);
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file->store_32(mode);
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file->store_buffer(md5.digest,16);
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file->store_64(data.size());
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file->store_buffer(compressed.ptr(),compressed.size());
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file->close();
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memdelete(file);
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file=NULL;
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data.clear();
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} else {
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file->close();
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memdelete(file);
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data.clear();
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file=NULL;
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}
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}
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bool FileAccessEncrypted::is_open() const{
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return file!=NULL;
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}
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void FileAccessEncrypted::seek(size_t p_position){
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if (p_position > (size_t)data.size())
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p_position=data.size();
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pos=p_position;
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eofed=false;
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}
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void FileAccessEncrypted::seek_end(int64_t p_position){
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seek( data.size() + p_position );
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}
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size_t FileAccessEncrypted::get_pos() const{
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return pos;
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}
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size_t FileAccessEncrypted::get_len() const{
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return data.size();
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}
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bool FileAccessEncrypted::eof_reached() const{
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return eofed;
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}
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uint8_t FileAccessEncrypted::get_8() const{
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ERR_FAIL_COND_V(writing,0);
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if (pos>=data.size()) {
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eofed=true;
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return 0;
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}
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uint8_t b = data[pos];
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pos++;
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return b;
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}
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int FileAccessEncrypted::get_buffer(uint8_t *p_dst, int p_length) const{
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ERR_FAIL_COND_V(writing,0);
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int to_copy=MIN(p_length,data.size()-pos);
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for(int i=0;i<to_copy;i++) {
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p_dst[i]=data[pos++];
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}
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if (to_copy<p_length) {
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eofed=true;
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}
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return to_copy;
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}
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Error FileAccessEncrypted::get_error() const{
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return eofed?ERR_FILE_EOF:OK;
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}
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void FileAccessEncrypted::store_buffer(const uint8_t *p_src,int p_length) {
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ERR_FAIL_COND(!writing);
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if (pos<data.size()) {
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for(int i=0;i<p_length;i++) {
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store_8(p_src[i]);
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}
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} else if (pos==data.size()) {
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data.resize(pos+p_length);
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for(int i=0;i<p_length;i++) {
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data[pos+i]=p_src[i];
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}
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pos+=p_length;
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}
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}
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void FileAccessEncrypted::store_8(uint8_t p_dest){
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ERR_FAIL_COND(!writing);
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if (pos<data.size()) {
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data[pos]=p_dest;
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pos++;
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} else if (pos==data.size()){
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data.push_back(p_dest);
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pos++;
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}
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}
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bool FileAccessEncrypted::file_exists(const String& p_name){
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FileAccess *fa = FileAccess::open(p_name,FileAccess::READ);
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if (!fa)
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return false;
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memdelete(fa);
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return true;
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}
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uint64_t FileAccessEncrypted::_get_modified_time(const String& p_file){
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return 0;
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}
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FileAccessEncrypted::FileAccessEncrypted() {
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file=NULL;
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pos=0;
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eofed=false;
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mode=MODE_MAX;
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writing=false;
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}
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FileAccessEncrypted::~FileAccessEncrypted() {
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if (file)
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close();
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}
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