d8223ffa75
That year should bring the long-awaited OpenGL ES 3.0 compatible renderer
with state-of-the-art rendering techniques tuned to work as low as middle
end handheld devices - without compromising with the possibilities given
for higher end desktop games of course. Great times ahead for the Godot
community and the gamers that will play our games!
(cherry picked from commit c7bc44d5ad)
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) 2007-2017 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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