OBB: use PBKDF2 for key generation.
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
diff --git a/include/utils/ObbFile.h b/include/utils/ObbFile.h
index 5243f50..47559cd 100644
--- a/include/utils/ObbFile.h
+++ b/include/utils/ObbFile.h
@@ -27,6 +27,7 @@
// OBB flags (bit 0)
#define OBB_OVERLAY (1 << 0)
+#define OBB_SALTED (1 << 1)
class ObbFile : public RefBase {
protected:
@@ -70,6 +71,26 @@
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;
}
@@ -103,6 +124,12 @@
/* 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;