dhav's blog

Here is a simple example explaining the usage of strong and weak pointers using android's RefBase class and the Android.mk to compile the same. Its a modified version of code written by Daniel in the following link. http://himmele.blogspot.com/2012/03/androids-c-reference-counting.html strong_pointer.cpp file:  #include <stdio.h> #include "utils/RefBase.h" namespace android {  class RefTest : public RefBase { public:     RefTest(int32_t id) : mID(id) {         printf("RefTest ctor: %d\n", mID);     }     virtual ~RefTest() {         printf("RefTest dtor: %d\n", mID);     }     int32_t id() const {         return mID;     } private:     int32_t mID; }; int strong_pointer() {     sp<RefTest> ref1 = new RefTest(1);     sp<RefTest> ref5;   ...

Recently I was testing few test streams encrypted with AES-CBC-CTS mode, which is another block cipher mode that allows encrypting of data that is not evenly divisible into blocks (unlike AES-CBC mode). I also found that decryption of such streams is not possible using OpenSSL, as it does not support this block cipher mode. Since OpenSSL does support encryption/decryption for AES-CBC mode, I decided to extend this logic to support AES-CBC-CTS mode. I found following article on wikipedia which explains CBC-CTS encryption/decryption in detail. http://en.wikipedia.org/wiki/Ciphertext_stealing#CBC_ciphertext_stealing_decryption_using_a_standard_CBC_interface . Following C Routine can be used to decrypt data encrypted with AES-CBC-CTS block cipher mode. _DecryptData(DRM_KeyCtx_T  KEY_CTX, // KeyCtx_T is a structure containing the Key and IV.                      UINT8 *data, // ...