How to write Cipher.getInstance("DES"); in jni?

Question

I would like to change

Cipher cipher = Cipher.getInstance("DES"); 

into cpp code in jni.How to do it?

Answer 1

JNIEnv *jni; //Comes from somewhere
jclass cl = jni->FindClass("javax/crypto/Cipher");
jmethodID MID = jni->GetStaticMethodID(cl, "getInstance", "(Ljava/lang/String)Ljavax/crypto/Cipher;");
jstring s = jni->NewStringUTF("DES");
jobject cipher = jni->CallStaticObjectMethod(cl, MID, s);

That's omitting error handling.