К сожалению, почти замечание просто в java :-), для этой простой и обычной задачи я не смог найти подготовленную библиотеку, я закончил тем, что написал это ( это был источник ):
import java.net.URLDecoder;
import java.net.URLEncoder;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEParameterSpec;
/**
* An easy to use class to encrypt and decrypt a string. Just call the simplest
* constructor and the needed methods.
*
*/
public class StringEncryptor {
private Cipher encryptCipher;
private Cipher decryptCipher;
private sun.misc.BASE64Encoder encoder = new sun.misc.BASE64Encoder();
private sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder();
final private String charset = "UTF-8";
final private String defaultEncryptionPassword = "PAOSIDUFHQWER98234QWE378AHASDF93HASDF9238HAJSDF923";
final private byte[] defaultSalt = {
(byte) 0xa3, (byte) 0x21, (byte) 0x24, (byte) 0x2c,
(byte) 0xf2, (byte) 0xd2, (byte) 0x3e, (byte) 0x19 };
/**
* The simplest constructor which will use a default password and salt to
* encode the string.
*
* @throws SecurityException
*/
public StringEncryptor() throws SecurityException {
setupEncryptor(defaultEncryptionPassword, defaultSalt);
}
/**
* Dynamic constructor to give own key and salt to it which going to be used
* to encrypt and then decrypt the given string.
*
* @param encryptionPassword
* @param salt
*/
public StringEncryptor(String encryptionPassword, byte[] salt) {
setupEncryptor(encryptionPassword, salt);
}
public void init(char[] pass, byte[] salt, int iterations) throws SecurityException {
try {
PBEParameterSpec ps = new javax.crypto.spec.PBEParameterSpec(salt, 20);
SecretKeyFactory kf = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
SecretKey k = kf.generateSecret(new javax.crypto.spec.PBEKeySpec(pass));
encryptCipher = Cipher.getInstance("PBEWithMD5AndDES/CBC/PKCS5Padding");
encryptCipher.init(Cipher.ENCRYPT_MODE, k, ps);
decryptCipher = Cipher.getInstance("PBEWithMD5AndDES/CBC/PKCS5Padding");
decryptCipher.init(Cipher.DECRYPT_MODE, k, ps);
} catch (Exception e) {
throw new SecurityException("Could not initialize CryptoLibrary: " + e.getMessage());
}
}
/**
*
* method to decrypt a string.
*
* @param str
* Description of the Parameter
*
* @return String the encrypted string.
*
* @exception SecurityException
* Description of the Exception
*/
public synchronized String encrypt(String str) throws SecurityException {
try {
byte[] utf8 = str.getBytes(charset);
byte[] enc = encryptCipher.doFinal(utf8);
return URLEncoder.encode(encoder.encode(enc),charset);
}
catch (Exception e)
{
throw new SecurityException("Could not encrypt: " + e.getMessage());
}
}
/**
*
* method to encrypting a string.
*
* @param str
* Description of the Parameter
*
* @return String the encrypted string.
*
* @exception SecurityException
* Description of the Exception
*/
public synchronized String decrypt(String str) throws SecurityException {
try {
byte[] dec = decoder.decodeBuffer(URLDecoder.decode(str,charset));
byte[] utf8 = decryptCipher.doFinal(dec);
return new String(utf8, charset);
} catch (Exception e) {
throw new SecurityException("Could not decrypt: " + e.getMessage());
}
}
private void setupEncryptor(String defaultEncryptionPassword, byte[] salt) {
java.security.Security.addProvider(new com.sun.crypto.provider.SunJCE());
char[] pass = defaultEncryptionPassword.toCharArray();
int iterations = 3;
init(pass, salt, iterations);
}
}