95a6889312
Switch to using PBKDF2 for the key generation for OBBs. Any previously generated OBBs will stop being read correctly. A small pbkdf2gen program is available to allow generation of appropriate keys with the salts. Bug: 3059950 Change-Id: If4305c989fd692fd1150eb270dbf751e09c37295
146 lines
3.2 KiB
C++
146 lines
3.2 KiB
C++
/*
|
|
* Copyright (C) 2010 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#ifndef OBBFILE_H_
|
|
#define OBBFILE_H_
|
|
|
|
#include <stdint.h>
|
|
#include <strings.h>
|
|
|
|
#include <utils/RefBase.h>
|
|
#include <utils/String8.h>
|
|
|
|
namespace android {
|
|
|
|
// OBB flags (bit 0)
|
|
#define OBB_OVERLAY (1 << 0)
|
|
#define OBB_SALTED (1 << 1)
|
|
|
|
class ObbFile : public RefBase {
|
|
protected:
|
|
virtual ~ObbFile();
|
|
|
|
public:
|
|
ObbFile();
|
|
|
|
bool readFrom(const char* filename);
|
|
bool readFrom(int fd);
|
|
bool writeTo(const char* filename);
|
|
bool writeTo(int fd);
|
|
bool removeFrom(const char* filename);
|
|
bool removeFrom(int fd);
|
|
|
|
const char* getFileName() const {
|
|
return mFileName;
|
|
}
|
|
|
|
const String8 getPackageName() const {
|
|
return mPackageName;
|
|
}
|
|
|
|
void setPackageName(String8 packageName) {
|
|
mPackageName = packageName;
|
|
}
|
|
|
|
int32_t getVersion() const {
|
|
return mVersion;
|
|
}
|
|
|
|
void setVersion(int32_t version) {
|
|
mVersion = version;
|
|
}
|
|
|
|
int32_t getFlags() const {
|
|
return mFlags;
|
|
}
|
|
|
|
void setFlags(int32_t flags) {
|
|
mFlags = flags;
|
|
}
|
|
|
|
const unsigned char* getSalt(size_t* length) const {
|
|
if ((mFlags & OBB_SALTED) == 0) {
|
|
*length = 0;
|
|
return NULL;
|
|
}
|
|
|
|
*length = sizeof(mSalt);
|
|
return mSalt;
|
|
}
|
|
|
|
bool setSalt(const unsigned char* salt, size_t length) {
|
|
if (length != sizeof(mSalt)) {
|
|
return false;
|
|
}
|
|
|
|
memcpy(mSalt, salt, sizeof(mSalt));
|
|
mFlags |= OBB_SALTED;
|
|
return true;
|
|
}
|
|
|
|
bool isOverlay() {
|
|
return (mFlags & OBB_OVERLAY) == OBB_OVERLAY;
|
|
}
|
|
|
|
void setOverlay(bool overlay) {
|
|
if (overlay) {
|
|
mFlags |= OBB_OVERLAY;
|
|
} else {
|
|
mFlags &= ~OBB_OVERLAY;
|
|
}
|
|
}
|
|
|
|
static inline uint32_t get4LE(const unsigned char* buf) {
|
|
return buf[0] | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24);
|
|
}
|
|
|
|
static inline void put4LE(unsigned char* buf, uint32_t val) {
|
|
buf[0] = val & 0xFF;
|
|
buf[1] = (val >> 8) & 0xFF;
|
|
buf[2] = (val >> 16) & 0xFF;
|
|
buf[3] = (val >> 24) & 0xFF;
|
|
}
|
|
|
|
private:
|
|
/* Package name this ObbFile is associated with */
|
|
String8 mPackageName;
|
|
|
|
/* Package version this ObbFile is associated with */
|
|
int32_t mVersion;
|
|
|
|
/* Flags for this OBB type. */
|
|
int32_t mFlags;
|
|
|
|
/* Whether the file is salted. */
|
|
bool mSalted;
|
|
|
|
/* The encryption salt. */
|
|
unsigned char mSalt[8];
|
|
|
|
const char* mFileName;
|
|
|
|
size_t mFileSize;
|
|
|
|
size_t mFooterStart;
|
|
|
|
unsigned char* mReadBuf;
|
|
|
|
bool parseObbFile(int fd);
|
|
};
|
|
|
|
}
|
|
#endif /* OBBFILE_H_ */
|