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/**
* (c) Copyright 2020 IBM Corporation
* 1 New Orchard Road,
* Armonk, New York, 10504-1722
* United States
* +1 914 499 1900
* support: Nathaniel Mills [email protected]
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package com.mdfromhtml.core;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.util.Base64;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
/**
* Utility to mask / unmask text. While there is a well defined key used for
* masking, a different key can be set as either an environment variable or
* passed as a system property (e.g., -Dname=value on Java command line) using
* the name defined by {@link MDfromHTMLMasker#ENV_MASKER_KEY}
*/
public class MDfromHTMLCrypto {
private static final String REVERSE = "d3cry9t:";
public static final byte[] SALT = {
(byte) 0xfe, (byte) 0x31, (byte) 0x12, (byte) 0x17, (byte) 0xde,
(byte) 0x53, (byte) 0x16, (byte) 0x25,
};
private static byte[] base64Decode(String property) throws IOException {
return Base64.getUrlDecoder().decode(property);
}
private static String base64Encode(byte[] bytes) {
return Base64.getUrlEncoder().encodeToString(bytes);
}
/**
* Unmasks the text using the salt and key
*
* @param text
* string to be masked
* @param key
* character phrase used to mask the text
* @param salt
* bytes used to initialize the cryptographic environment
* @return unmasked version of the masked text
* @throws Exception
* if there is a problem with the cryptographic environment
*/
public static String decrypt(String text, char[] key, byte[] salt)
throws Exception {
SecretKeyFactory keyFactory;
try {
keyFactory = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
SecretKey secretKey = keyFactory
.generateSecret(new PBEKeySpec(key));
Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");
pbeCipher.init(Cipher.DECRYPT_MODE, secretKey,
new PBEParameterSpec(salt, 20));
return new String(pbeCipher.doFinal(base64Decode(text)), "UTF-8");
} catch (NoSuchAlgorithmException e) {
throw new Exception(
"Can not find needed algorithm: " + e.getLocalizedMessage(), e);
} catch (InvalidKeySpecException e) {
throw new Exception(
"Invalid key specification: " + e.getLocalizedMessage(), e);
} catch (NoSuchPaddingException e) {
throw new Exception("Missing padding: " + e.getLocalizedMessage(),
e);
} catch (InvalidKeyException e) {
throw new Exception("Invalid key: " + e.getLocalizedMessage(), e);
} catch (InvalidAlgorithmParameterException e) {
throw new Exception(
"Invalid algorithm parameter: " + e.getLocalizedMessage(), e);
} catch (UnsupportedEncodingException e) {
throw new Exception(
"Unsupported encoding: " + e.getLocalizedMessage(), e);
} catch (IllegalBlockSizeException e) {
throw new Exception(
"Illegal block size: " + e.getLocalizedMessage(), e);
} catch (BadPaddingException e) {
throw new Exception("Bad padding: " + e.getLocalizedMessage(), e);
} catch (IOException e) {
throw new Exception("IO Exception: " + e.getLocalizedMessage(), e);
}
}
/**
* Unmasks the text using the key and system supplied cryptographic
* initialization bytes
*
* @param text
* string to be unmasked
* @param key
* character phrase used to mask the text
* @return unmasked version of the masked text
* @throws Exception
* if there is a problem with the cryptographic environment
*/
public static String decrypt(String text, String key) throws Exception {
if (new String(MDfromHTMLUtils.getKey()).equals(key) == false) {
throw new Exception("Property or Password is invalid");
}
return decrypt(text, MDfromHTMLUtils.getKey(), SALT);
}
/**
* Masks the supplied text
*
* @param text
* string to be masked
* @return masked version of the text
* @throws Exception
* if there is a problem with the cryptographic environment
*/
public static String encrypt(String text) throws Exception {
return encrypt(text, MDfromHTMLUtils.getKey(), SALT);
}
/**
* Masks the supplied text using the key and salt bytes
*
* @param text
* string to be masked
* @param key
* character phrase used to mask the text
* @param salt
* bytes used to initialize the cryptographic environment
* @return masked version of the text
* @throws Exception
* if there is a problem with the cryptographic environment
*/
public static String encrypt(String text, char[] key, byte[] salt)
throws Exception {
SecretKeyFactory keyFactory;
try {
keyFactory = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
SecretKey secretKey = keyFactory
.generateSecret(new PBEKeySpec(key));
Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");
pbeCipher.init(Cipher.ENCRYPT_MODE, secretKey,
new PBEParameterSpec(salt, 20));
return base64Encode(pbeCipher.doFinal(text.getBytes("UTF-8")));
} catch (NoSuchAlgorithmException e) {
throw new Exception(
"Can not find needed algorithm: " + e.getLocalizedMessage(), e);
} catch (InvalidKeySpecException e) {
throw new Exception(
"Invalid key specification: " + e.getLocalizedMessage(), e);
} catch (NoSuchPaddingException e) {
throw new Exception("Missing padding: " + e.getLocalizedMessage(),
e);
} catch (InvalidKeyException e) {
throw new Exception("Invalid key: " + e.getLocalizedMessage(), e);
} catch (InvalidAlgorithmParameterException e) {
throw new Exception(
"Invalid algorithm parameter: " + e.getLocalizedMessage(), e);
} catch (UnsupportedEncodingException e) {
throw new Exception(
"Unsupported encoding: " + e.getLocalizedMessage(), e);
} catch (IllegalBlockSizeException e) {
throw new Exception(
"Illegal block size: " + e.getLocalizedMessage(), e);
} catch (BadPaddingException e) {
throw new Exception("Bad padding: " + e.getLocalizedMessage(), e);
}
}
public static void main(String[] args) throws Exception {
String originalText = "secret";
while (true) {
originalText = MDfromHTMLUtils
.prompt("Enter text to be masked, or nothing to quit:", true);
if (originalText.length() == 0) {
break;
}
if (originalText.startsWith(REVERSE) == false) {
System.out.println("Original text: " + originalText);
String maskedText = encrypt(originalText);
System.out.println("Masked text: " + maskedText);
String unmaskedText = decrypt(maskedText,
MDfromHTMLUtils.getKey().toString());
System.out.println("Unmasked text: " + unmaskedText);
} else {
originalText = originalText.substring(REVERSE.length());
System.out.println("Masked text: " + originalText);
String unmaskedText = decrypt(originalText,
MDfromHTMLUtils.getKey().toString());
System.out.println("Unmasked text: " + unmaskedText);
}
}
System.out.println("Goodbye");
}
}
