wty21cn / crypto-utils

AES and RSA encryption for Java made simple

Crypto Utils

A simple library for easily encrypting and decrypting data using either AES, RSA or combined algorithms.

AESUtils

A simple library to easily encrypt and decrypt data using the AES algorithm.

Features

• Use a random key
• Create a key from a password
• Can specify a salt with a password for better encryption
• Can decrypt data with a password
• Write key to file
• Retrieve a key from a file
• Super easy to use

Examples

Using a random key

		// the bytes you want to encrypt
		byte[] message = "Hello world!".getBytes();

		// create a random key
		SecretKey secretKey = AESUtils.generateKey();
	
		// encrypt the message using the key that was generated
		byte[] encrypted = AESUtils.encrypt(secretKey, message);

		// decrypt the message by using the key again
		byte[] decrypted = AESUtils.decrypt(secretKey, encrypted);

		// results
		System.out.println("original: " + new String(message));
		System.out.println("encrypted: " + new String(encrypted));
		System.out.println("decrypted: " + new String(decrypted));

Result

original: Hello world!
encrypted: ù2è–®ÃѦDçÆÔ/šÙÆ
decrypted: Hello world!

Using your own password as the key

		// the bytes you want to encrypt
		byte[] message = "Hello world!".getBytes();

		// create a key by using your own password
		SecretKey secretKey = AESUtils.createKey("password");
	
		// encrypt the message using the key that was generated
		byte[] encrypted = AESUtils.encrypt(secretKey, message);

		// decrypt the message by entering a password
		byte[] decrypted = AESUtils.decrypt("password", encrypted);

		// results
		System.out.println("original: " + new String(message));
		System.out.println("encrypted: " + new String(encrypted));
		System.out.println("decrypted: " + new String(decrypted));

Result

original: Hello world!
encrypted: �O¥e†Å8��Qúµd�³Ç
decrypted: Hello world!

RSAUtils

A simple library to easily encrypt and decrypt data using the RSA algorithm.

Features

• Generates both random public and private keys
• 2048 size
• Get public key object from file
• Get private key object from file
• Super easy to use

Example

	public static void main(String[] args) throws Exception {
	
		byte[] data = "hello cryptography".getBytes();
		
		RSAUtils.generateKey("./public.key", "./private.key");		

		PublicKey publicKey = RSAUtils.getPublicKey("./public.key");

		byte[] encrypted = RSAUtils.encrypt(publicKey, data);		

		PrivateKey privateKey = RSAUtils.getPrivateKey("./private.key");

		byte[] decrypted = RSAUtils.decrypt(privateKey, encrypted);		

		System.out.println("original: " + new String(data));
		System.out.println("encrypted: " + new String(encrypted));
		System.out.println("decrypted: " + new String(decrypted));

	}