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Example of AES encryption and decryption in Java
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/** | |
* Code written by P. Gajland | |
* https://github.com/GaPhil | |
*/ | |
import java.security.Key; | |
import javax.crypto.Cipher; | |
import sun.misc.BASE64Encoder; | |
import sun.misc.BASE64Decoder; | |
import javax.crypto.spec.SecretKeySpec; | |
public class AESenc { | |
private static final String ALGO = "AES"; | |
private static final byte[] keyValue = | |
new byte[]{'T', 'h', 'e', 'B', 'e', 's', 't', 'S', 'e', 'c', 'r', 'e', 't', 'K', 'e', 'y'}; | |
/** | |
* Encrypt a string with AES algorithm. | |
* | |
* @param data is a string | |
* @return the encrypted string | |
*/ | |
public static String encrypt(String data) throws Exception { | |
Key key = generateKey(); | |
Cipher c = Cipher.getInstance(ALGO); | |
c.init(Cipher.ENCRYPT_MODE, key); | |
byte[] encVal = c.doFinal(data.getBytes()); | |
return new BASE64Encoder().encode(encVal); | |
} | |
/** | |
* Decrypt a string with AES algorithm. | |
* | |
* @param encryptedData is a string | |
* @return the decrypted string | |
*/ | |
public static String decrypt(String encryptedData) throws Exception { | |
Key key = generateKey(); | |
Cipher c = Cipher.getInstance(ALGO); | |
c.init(Cipher.DECRYPT_MODE, key); | |
byte[] decordedValue = new BASE64Decoder().decodeBuffer(encryptedData); | |
byte[] decValue = c.doFinal(decordedValue); | |
return new String(decValue); | |
} | |
/** | |
* Generate a new encryption key. | |
*/ | |
private static Key generateKey() throws Exception { | |
return new SecretKeySpec(keyValue, ALGO); | |
} | |
} |
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