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

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

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));

    }