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Trial & Error

lry127 / AESCBCCryptoWrapper.java

Last active January 2, 2024 14:58

Java AES CBC encryption (decryption) util with example.

	import javax.crypto.*;
	import javax.crypto.spec.IvParameterSpec;
	import javax.crypto.spec.PBEKeySpec;
	import javax.crypto.spec.SecretKeySpec;
	import java.nio.charset.StandardCharsets;
	import java.security.InvalidAlgorithmParameterException;
	import java.security.InvalidKeyException;
	import java.security.NoSuchAlgorithmException;
	import java.security.SecureRandom;
	import java.security.spec.InvalidKeySpecException;

lry127 / Java AES GCM encryption (decryption) util with example.

Created January 2, 2024 14:56

AESGCMCryptoWrapper.java

	import javax.crypto.*;
	import javax.crypto.spec.GCMParameterSpec;
	import javax.crypto.spec.PBEKeySpec;
	import javax.crypto.spec.SecretKeySpec;
	import java.nio.charset.StandardCharsets;
	import java.security.InvalidAlgorithmParameterException;
	import java.security.InvalidKeyException;
	import java.security.NoSuchAlgorithmException;
	import java.security.SecureRandom;
	import java.security.spec.InvalidKeySpecException;

lry127 / Generator.java

Created May 3, 2024 10:35

an identifier generator used to generate a lot of confusing identifiers for code obfuscation (e.g. you can use it to generate proguard dictionary)

	import java.io.BufferedOutputStream;
	import java.io.FileOutputStream;
	import java.io.IOException;
	import java.io.OutputStream;
	import java.nio.charset.StandardCharsets;
	import java.util.HashSet;
	import java.util.Random;

	/**
	* an identifier generator, each generated value is guaranteed to be unique <br>

lry127 / LinkedList.h

Last active July 1, 2024 09:58

LinkedList implementation in C++ for educational purpose

lry127 / D1Q1.java

Created September 10, 2024 12:02

stuck with "adventofcode" 2023 day 1 problem

	import java.util.Scanner;

	public class D1Q1 {
	static class NumberReader {
	static int parseLine(String data) {
	Integer firstDigit = null, lastDigit = null;
	for (char c : data.toCharArray()) {
	if (Character.isDigit(c)) {
	int digit = Character.getNumericValue(c);
	if (firstDigit == null) {

lry127 / D3.java

Last active September 13, 2024 11:44

Advent of code Day 3 solution in Java

	import java.util.*;

	public class D3 {
	record Point(int row, int col) {}

	static class NumberRecord {
	ArrayList<Point> span = new ArrayList<>();
	ArrayList<Integer> values = new ArrayList<>();

	void takePoint(Point pt, int value) {

lry127 / gist:095e9e0e863e68c7388581e6e411064a

Last active October 9, 2024 12:09

main.c

	#include <stdio.h>
	#include <stdlib.h>

	int main(void) {
	int operand1, operand2;
	char operator;
	scanf("%d %c %d", &operand1, &operator, &operand2);

	int result = 0;
	char* print_out = NULL;