📚 Frida Crash Course

function getApplicationContext() {
		const ActivityThread = Java.use("android.app.ActivityThread");
		const currentApplication = ActivityThread.currentApplication();

		var ret = currentApplication.getApplicationContext();
		return ret;
}


function bruteforcePIN() {
	Java.perform(() => {
    // if the method requires Context type arg
		var context = getApplicationContext();
		try {
      // code here
    }
    catch(e) {
      // exceptions to handle, example:
      console.log(e.message);
    }    
	});
}

function makePinMatchReturnTrueAlways() {
	Java.perform(function(){
		try {
			var t=Java.use("java.lang.Boolean").$new(true);
			Java.use(/*full class name like 'com.github.browep.privatephotovault.crypto.CryptoUtils'*/).pinsMatch.implementation=function(x,y, z){
        //instead of pinsMatch - the method name to hook
        // function(x,y,z) can be function() or function(x,y) etc depending on the amount of arguments for the hooked function
				console.log("Original value: " + this.pinsMatch(x,y,z));
				return Boolean(t);
			}
		}
		catch(e) {
			console.log(e.message);
		}
	})