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1Java AES 256-bit Encryption/Decryption class
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12java aes 256-bit encryption/decryption class
13java aes 256 bit encryption example
14java aes 256 bit encryption
15java aes 256 bit encryption library with salt
16java aes encryption with 256 bit key
17java 256-bit aes password-based encryption
18how to implement aes 256 bit encryption in java
19aes 256 bit encryption in java
20256-bit aes password based encryption in java
21aes encryption with 256 bit key in java
22java aes 128 bit encryption example
23
24mport java.security.spec.KeySpec;
25import javax.crypto.Cipher;
26import javax.crypto.SecretKey;
27import javax.crypto.SecretKeyFactory;
28import javax.crypto.spec.IvParameterSpec;
29import javax.crypto.spec.PBEKeySpec;
30import javax.crypto.spec.SecretKeySpec;
31import sun.misc.BASE64Decoder;
32import sun.misc.BASE64Encoder;
33 
34public class AESEncrypter {
35 
36    private static final byte[] SALT = {
37        (byte) 0xA9, (byte) 0x9B, (byte) 0xC8, (byte) 0x32,
38        (byte) 0x56, (byte) 0x35, (byte) 0xE3, (byte) 0x03
39    };
40    private static final int ITERATION_COUNT = 65536;
41    private static final int KEY_LENGTH = 256;
42    private Cipher ecipher;
43    private Cipher dcipher;
44   
45    AESEncrypter(String passPhrase) throws Exception {
46        SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
47        KeySpec spec = new PBEKeySpec(passPhrase.toCharArray(), SALT, ITERATION_COUNT, KEY_LENGTH);
48        SecretKey tmp = factory.generateSecret(spec);
49        SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES");
50 
51        ecipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
52        ecipher.init(Cipher.ENCRYPT_MODE, secret);
53       
54        dcipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
55        byte[] iv = ecipher.getParameters().getParameterSpec(IvParameterSpec.class).getIV();
56        dcipher.init(Cipher.DECRYPT_MODE, secret, new IvParameterSpec(iv));
57    }
58 
59    public String encrypt(String encrypt) throws Exception {
60        byte[] bytes = encrypt.getBytes("UTF8");
61        byte[] encrypted = encrypt(bytes);
62        return new BASE64Encoder().encode(encrypted);
63    }
64 
65    public byte[] encrypt(byte[] plain) throws Exception {
66        return ecipher.doFinal(plain);
67    }
68 
69    public String decrypt(String encrypt) throws Exception {
70        byte[] bytes = new BASE64Decoder().decodeBuffer(encrypt);
71        byte[] decrypted = decrypt(bytes);
72        return new String(decrypted, "UTF8");
73    }
74 
75    public byte[] decrypt(byte[] encrypt) throws Exception {
76        return dcipher.doFinal(encrypt);
77    }
78 
79    public static void main(String[] args) throws Exception {
80 
81        String message = "MESSAGE";
82        String password = "PASSWORD";
83 
84        AESEncrypter encrypter = new AESEncrypter(password);
85        String encrypted = encrypter.encrypt(message);
86        String decrypted = encrypter.decrypt(encrypted);
87 
88        System.out.println("Encrypt(\"" + message + "\", \"" + password + "\") = \"" + encrypted + "\"");
89        System.out.println("Decrypt(\"" + encrypted + "\", \"" + password + "\") = \"" + decrypted + "\"");
90    }
91}