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RePlay is a fork of the Play1 framework, created by Codeborne.

There is a newer version: 2.6.3

package play.libs;

import play.Play;
import play.exceptions.UnexpectedException;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.SecretKeySpec;

import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;

import static java.nio.charset.StandardCharsets.UTF_8;

public class Crypter {
    private final String salt;

    public Crypter(String salt) {
        this.salt = salt;
    }

    public String encryptAES(String value) {
        return encryptAES(value, Play.secretKey.substring(0, 16));
    }

    private String encryptAES(String value, String privateKey) {
        try {
            byte[] raw = privateKey.getBytes(UTF_8);
            SecretKeySpec keySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES");
            cipher.init(Cipher.ENCRYPT_MODE, keySpec);
            return Codec.byteToHexString(cipher.doFinal((salt + value).getBytes(UTF_8)));
        } catch (NoSuchAlgorithmException | NoSuchPaddingException |
                 InvalidKeyException | IllegalBlockSizeException | BadPaddingException ex) {
            throw new UnexpectedException(ex);
        }
    }

    public String decryptAES(String value) {
        return decryptAES(value, Play.secretKey.substring(0, 16));
    }

    private String decryptAES(String value, String privateKey) {
        try {
            byte[] raw = privateKey.getBytes(UTF_8);
            SecretKeySpec keySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES");
            cipher.init(Cipher.DECRYPT_MODE, keySpec);
            return new String(cipher.doFinal(Codec.hexStringToByte(value)), UTF_8).substring(salt.length());
        } catch (NoSuchAlgorithmException | NoSuchPaddingException | 
                 InvalidKeyException | IllegalBlockSizeException | BadPaddingException ex) {
            throw new UnexpectedException(ex);
        }
    }
}