A class to encrypt and decrypt using 3DES in java

TripleDES.java

import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;

/**
 *
 * @author josepholaoye
 */
public class TripleDES {

    String key;

    public TripleDES(String myEncryptionKey) {
        key = myEncryptionKey;
    }

    /**
     * Method To Encrypt The String
     *
     * @param unencryptedString
     * @return encrpted string
     * @throws java.security.NoSuchAlgorithmException
     * @throws java.io.UnsupportedEncodingException
     * @throws javax.crypto.NoSuchPaddingException
     * @throws java.security.InvalidKeyException
     * @throws javax.crypto.IllegalBlockSizeException
     * @throws javax.crypto.BadPaddingException
     */
    public String harden(String unencryptedString) throws NoSuchAlgorithmException, UnsupportedEncodingException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
        MessageDigest md = MessageDigest.getInstance("md5");
        byte[] digestOfPassword = md.digest(key.getBytes("utf-8"));
        byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);

        for (int j = 0, k = 16; j < 8;) {
            keyBytes[k++] = keyBytes[j++];
        }

        SecretKey secretKey = new SecretKeySpec(keyBytes, "DESede");
        Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);

        byte[] plainTextBytes = unencryptedString.getBytes("utf-8");
        byte[] buf = cipher.doFinal(plainTextBytes);
        byte[] base64Bytes = Base64.encodeBase64(buf);
        String base64EncryptedString = new String(base64Bytes);

        return base64EncryptedString;
    }

    /**
     * Method To Decrypt An Ecrypted String
     *
     * @param encryptedString
     * @return
     * @throws java.io.UnsupportedEncodingException
     * @throws java.security.NoSuchAlgorithmException
     * @throws javax.crypto.NoSuchPaddingException
     * @throws java.security.InvalidKeyException
     * @throws javax.crypto.IllegalBlockSizeException
     * @throws javax.crypto.BadPaddingException
     */
    public String soften(String encryptedString) throws UnsupportedEncodingException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
        if(encryptedString == null)
        {
            return "";
        }
        byte[] message = Base64.decodeBase64(encryptedString.getBytes("utf-8"));

        MessageDigest md = MessageDigest.getInstance("MD5");
        byte[] digestOfPassword = md.digest(key.getBytes("utf-8"));
        byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);
        
        for (int j = 0, k = 16; j < 8;) {
            keyBytes[k++] = keyBytes[j++];
        }
        
        SecretKey secretKey = new SecretKeySpec(keyBytes, "DESede");

        Cipher decipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
        decipher.init(Cipher.DECRYPT_MODE, secretKey);

        byte[] plainText = decipher.doFinal(message);

        return new String(plainText, "UTF-8");

    }

}

Thanks for the code. It works like a charm. Used this code to create a triple DES online tool.

hi there,

Is it possible to add Main function to this to be used in cmd like (java TripleDES.java) which will take a key and the text from the user to encrypt it and decrypt it?

I was trying build this in python but I could not

Thank you

hi there,

Is it possible to add Main function to this to be used in cmd like (java TripleDES.java) which will take a key and the text from the user to encrypt it and decrypt it?

I was trying build this in python but I could not

Thank you

Yeah, you can add a main() function.

Thank you, it is working very fine.

I can't import org.apache.commons.codec.binary.Base64;
package org.apache.commons.codec.binary does not exist

I can't import org.apache.commons.codec.binary.Base64;
package org.apache.commons.codec.binary does not exist

https://commons.apache.org/proper/commons-codec/

What if the the key is in HEX format, will the byte[] digestOfPassword = md.digest(key.getBytes("utf-8")); still work ?

What if the the key is in HEX format, will the byte[] digestOfPassword = md.digest(key.getBytes("utf-8")); still work ?

Hopefully, as long as it is in the utf-8 encoding, it should work.