import java.security.spec.KeySpec;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
public class EncryptDecryptUtil {
private static final String UNICODE_FORMAT = "UTF8";
public static final String DESEDE_ENCRYPTION_SCHEME = "DESede";
private KeySpec keySpec;
private SecretKeyFactory secretKeyFactory;
private Cipher cipher;
byte[] keyAsBytes;
private String encryptionKey;
private String encryptionScheme;
private SecretKey secretKey;
public EncryptDecryptUtil() throws Exception
{
encryptionKey = "EncryptionKeyForEncryption";
encryptionScheme = DESEDE_ENCRYPTION_SCHEME;
keyAsBytes = encryptionKey.getBytes(UNICODE_FORMAT);
keySpec = new DESedeKeySpec(keyAsBytes);
secretKeyFactory = SecretKeyFactory.getInstance(encryptionScheme);
cipher = Cipher.getInstance(encryptionScheme);
secretKey = secretKeyFactory.generateSecret(keySpec);
}
public String encrypt(String unencryptedString) {
String encryptedString = null;
try {
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
byte[] plainText = unencryptedString.getBytes(UNICODE_FORMAT);
byte[] encryptedText = cipher.doFinal(plainText);
BASE64Encoder base64encoder = new BASE64Encoder();
encryptedString = base64encoder.encode(encryptedText);
} catch (Exception e) {
e.printStackTrace();
}
return encryptedString;
}
public String decrypt(String encryptedString) {
String decryptedText=null;
try {
cipher.init(Cipher.DECRYPT_MODE, secretKey);
BASE64Decoder base64decoder = new BASE64Decoder();
byte[] encryptedText = base64decoder.decodeBuffer(encryptedString);
byte[] plainText = cipher.doFinal(encryptedText);
decryptedText= bytes2String(plainText);
} catch (Exception e) {
e.printStackTrace();
}
return decryptedText;
}
private static String bytes2String(byte[] bytes) {
StringBuffer stringBuffer = new StringBuffer();
for (int i = 0; i < bytes.length; i++) {
stringBuffer.append((char) bytes[i]);
}
return stringBuffer.toString();
}
/**
* Testing The Encryption And Decryption Technique
*/
public static void main(String args []) throws Exception
{
EncryptDecryptUtil myEncryptor = new EncryptDecryptUtil();
String stringToEncrypt= "theherald";
String encrypted=myEncryptor.encrypt(stringToEncrypt);
String decrypted=myEncryptor.decrypt(encrypted);
System.out.println("The String To be Encrypted : "+stringToEncrypt);
System.out.println("Encrypted Value of the String : " + encrypted);
System.out.println("Decrypted Value of the String : "+decrypted);
}
}
The output is ::::::
The String To be Encrypted : theherald
Encrypted Value of the String :b6WaWLvUO7XznWLKxDzGXw==
Decrypted Value of the String :theherald
