Need Help with Error: DES PBE without Salt?
I know nothing about encryption or how it works.
I found this code online and would like to make one minor change.
Is it possible to use the same code but without a Salt?
All I editted (and the problem) is in the
public DesEncrypter(String passPhrase){} method.
When I edit the code I get the following error:
ERROR: INIT
java.security.InvalidKeyException: requires PBE parameters
at com.sun.crypto.provider.PBEWithMD5AndDESCipher.engineInit(DashoA13*..)
at javax.crypto.Cipher.a(DashoA13*..)
at javax.crypto.Cipher.a(DashoA13*..)
at javax.crypto.Cipher.init(DashoA13*..)
at javax.crypto.Cipher.init(DashoA13*..)
at DesEncrypter.<init>(DesEncrypter.java:73)
at DesEncrypter.main(DesEncrypter.java:28)
Caused by: java.security.InvalidAlgorithmParameterException: Parameters missing
at com.sun.crypto.provider.SunJCE_ab.a(DashoA13*..)
at com.sun.crypto.provider.PBEWithMD5AndDESCipher.engineInit(DashoA13*..)
... 7 more
ERROR: DECRYPT
java.lang.IllegalStateException: Cipher not initialized
at javax.crypto.Cipher.c(DashoA13*..)
at javax.crypto.Cipher.doFinal(DashoA13*..)
at DesEncrypter.decrypt(DesEncrypter.java:113)
at DesEncrypter.main(DesEncrypter.java:31)
Text: Don't tell anybody!
Password: password
Encrypt: 80p+Wip2eyVFnmSOwOSAPbHXy00MCsKx
Decrypt:null
Press any key tocontinue . . .
Here is the code (I commented out the original working piece
of code which is followed by the non-salt version):
/*
http://www.exampledepot.com/egs/javax.crypto/DesString.html
*/
import javax.crypto.*;
import javax.crypto.spec.*;
import java.io.*;
import java.security.spec.*;
publicclass DesEncrypter{
publicstaticvoid main(String[] args){
try{
String text ="Don't tell anybody!";
String password ="password";
// Generate a temporary key. In practice, you would save this key.
// See also e464 Encrypting with DES Using a Pass Phrase.
SecretKey key = KeyGenerator.getInstance("DES").generateKey();
// Create encrypter/decrypter class
//DesEncrypter encrypter = new DesEncrypter(key);
DesEncrypter encrypter =new DesEncrypter(password);
String encrypted = encrypter.encrypt(text);
String decrypted = encrypter.decrypt(encrypted);
System.out.println("Text: " + text);
System.out.println("Password: " + password);
System.out.println("Encrypt: " + encrypted);
System.out.println("Decrypt: " + decrypted);
}catch(Exception e){
System.out.println("\nERROR: MAIN");
e.printStackTrace();
}
}
public DesEncrypter(String passPhrase){
try{
/*
// Create the key
KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt, iterationCount);
SecretKey key = SecretKeyFactory.getInstance("PBEWithMD5AndDES").generateSecret(keySpec);
ecipher = Cipher.getInstance(key.getAlgorithm());
dcipher = Cipher.getInstance(key.getAlgorithm());
// Prepare the parameter to the ciphers
AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount);
// Create the ciphers
ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
*/
KeySpec keySpec =new PBEKeySpec(passPhrase.toCharArray());
SecretKey key = SecretKeyFactory.getInstance("PBEWithMD5AndDES").generateSecret(keySpec);
ecipher = Cipher.getInstance(key.getAlgorithm());
dcipher = Cipher.getInstance(key.getAlgorithm());
ecipher.init(Cipher.ENCRYPT_MODE, key);
dcipher.init(Cipher.DECRYPT_MODE, key);
}catch(Exception e){
System.out.println("\nERROR: INIT");
e.printStackTrace();
}
}
public String encrypt(String str){
try{
// Encode the string into bytes using utf-8
byte[] utf8 = str.getBytes("UTF8");
// Encrypt
byte[] enc = ecipher.doFinal(utf8);
// Encode bytes to base64 to get a string
returnnew sun.misc.BASE64Encoder().encode(enc);
}catch(Exception e){
System.out.println("\nERROR: ENCRYPT");
e.printStackTrace();
}
returnnull;
}
public String decrypt(String str){
try{
// Decode base64 to get bytes
byte[] dec =new sun.misc.BASE64Decoder().decodeBuffer(str);
// Decrypt
byte[] utf8 = dcipher.doFinal(dec);
// Decode using utf-8
returnnew String(utf8,"UTF8");
}catch(Exception e){
System.out.println("\nERROR: DECRYPT");
e.printStackTrace();
}
returnnull;
}
Cipher ecipher;
Cipher dcipher;
byte[] salt ={(byte)0xA9, (byte)0x9B, (byte)0xC8, (byte)0x32,
(byte)0x56, (byte)0x35, (byte)0xE3, (byte)0x03};
int iterationCount = 19;
}
