com.sun.faces.util.ByteArrayGuardAESCTR Maven / Gradle / Ivy
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package com.sun.faces.util;
import java.nio.charset.Charset;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.faces.FacesException;
import java.security.SecureRandom;
import java.util.SortedMap;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.crypto.BadPaddingException;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.xml.bind.DatatypeConverter;
/**
* This utility class is to provide both encryption and
* decryption Ciphers
to ResponseStateManager
* implementations wishing to provide encryption support.
*
* The algorithm used to encrypt byte array is AES with CBC.
*
* Original author Inderjeet Singh, J2EE Blue Prints Team. Modified to suit JSF
* needs.
*/
public final class ByteArrayGuardAESCTR {
// Log instance for this class
private static final Logger LOGGER = FacesLogger.RENDERKIT.getLogger();
private static final int KEY_LENGTH = 128;
private static final int IV_LENGTH = 16;
private static final String KEY_ALGORITHM = "AES";
private static final String CIPHER_CODE = "AES/CTR/NoPadding";
private SecretKey sk;
private IvParameterSpec ivspec;
private Charset utf8;
// ------------------------------------------------------------ Constructors
public ByteArrayGuardAESCTR() {
try {
setupKeyAndCharset();
} catch (Exception e) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE,
"Unexpected exception initializing encryption."
+ " No encryption will be performed.",
e);
}
System.err.println("ERROR: Initializing Ciphers");
}
}
// ---------------------------------------------------------- Public Methods
/**
* This method:
* Encrypts bytes using a cipher.
* Generates MAC for intialization vector of the cipher
* Generates MAC for encrypted data
* Returns a byte array consisting of the following concatenated together:
* |MAC for cnrypted Data | MAC for Init Vector | Encrypted Data |
* @param bytes The byte array to be encrypted.
* @return the encrypted byte array.
*/
public String encrypt(String value) {
String securedata = null;
byte[] bytes = value.getBytes(utf8);
try {
Cipher encryptCipher = Cipher.getInstance(CIPHER_CODE);
encryptCipher.init(Cipher.ENCRYPT_MODE, sk, ivspec);
// encrypt the plaintext
byte[] encdata = encryptCipher.doFinal(bytes);
// Base64 encode the encrypted bytes
securedata = DatatypeConverter.printBase64Binary(encdata);
} catch (Exception e) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE,
"Unexpected exception initializing encryption."
+ " No encryption will be performed.",
e);
}
return null;
}
return securedata;
}
public String decrypt(String value) throws InvalidKeyException {
byte[] bytes = DatatypeConverter.parseBase64Binary(value);;
try {
Cipher decryptCipher = Cipher.getInstance(CIPHER_CODE);
decryptCipher.init(Cipher.DECRYPT_MODE, sk, ivspec);
byte[] plaindata = decryptCipher.doFinal(bytes);
for (byte cur : plaindata) {
if (cur < 0 || cur > 255) {
throw new InvalidKeyException("Invalid characters in decrypted value");
}
}
return new String(plaindata, utf8);
} catch (NoSuchAlgorithmException nsae) {
throw new InvalidKeyException(nsae);
} catch (NoSuchPaddingException nspe) {
throw new InvalidKeyException(nspe);
} catch (InvalidAlgorithmParameterException iape) {
throw new InvalidKeyException(iape);
} catch (IllegalBlockSizeException ibse) {
throw new InvalidKeyException(ibse);
} catch (BadPaddingException bpe) {
throw new InvalidKeyException(bpe);
}
}
// --------------------------------------------------------- Private Methods
private void setupKeyAndCharset() {
try {
KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);
kg.init(KEY_LENGTH); // 256 if you're using the Unlimited Policy Files
sk = kg.generateKey();
} catch (Exception e) {
throw new FacesException(e);
}
SecureRandom rand = new SecureRandom();
byte[] iv = new byte[16];
rand.nextBytes(iv);
ivspec = new IvParameterSpec(iv);
SortedMap availableCharsets = Charset.availableCharsets();
if (availableCharsets.containsKey("UTF-8")) {
utf8 = availableCharsets.get("UTF-8");
} else if (availableCharsets.containsKey("UTF8")) {
utf8 = availableCharsets.get("UTF8");
} else {
throw new FacesException("Unable to get UTF-8 Charset.");
}
}
}