MainClass.java Source code

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Here is the source code for MainClass.java

Source

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;

import sun.misc.BASE64Decoder;

public class MainClass {

    public static void main(String[] args) throws Exception {
        System.out.println(decrypt(new char[] { 'a', 'b', 'c', 'd' }, "plaintext1234567890"));
    }

    private static String decrypt(char[] password, String text) throws Exception {
        String salt = text.substring(0, 12);
        String ciphertext = text.substring(12, text.length());
        BASE64Decoder decoder = new BASE64Decoder();
        byte[] saltArray = decoder.decodeBuffer(salt);
        byte[] ciphertextArray = decoder.decodeBuffer(ciphertext);

        PBEKeySpec keySpec = new PBEKeySpec(password);

        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBEWithSHAAndTwofish-CBC");

        SecretKey key = keyFactory.generateSecret(keySpec);

        PBEParameterSpec paramSpec = new PBEParameterSpec(saltArray, 1000);

        Cipher cipher = Cipher.getInstance("PBEWithSHAAndTwofish-CBC");
        cipher.init(Cipher.DECRYPT_MODE, key, paramSpec);

        return new String(cipher.doFinal(ciphertextArray));
    }
}