# Cipher DES Key Question

allan mays (civstaff@civ.com)
Thu, 8 May 1997 07:41:55 -0400

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    Message-Id: <199705081150.HAA04359@www5.clever.net>

    From: "allan mays" <civstaff@civ.com>

    To: <java-security@web2.javasoft.com>

    Subject: Cipher DES Key Question

    Date: Thu, 8 May 1997 07:41:55 -0400

I am designing a micropayments system using java and I am
testing the jce for some capabilities.... I have run into the
following problem... I need to create a Key object based upon
a string or byte array that was passed in from a file or a packet
received from the net... is this possible or must I use a
SecureRandom in order to create a key?

Below is the code I'm working with.

Any ideas or thoughts appreciated.

thanks,
allan mays
creative internet ventures,inc.

import java.security.*;

/**
*
*/
class Des {
public static void main(String[] args) {

int iR = 1;
try{
iR = desTest();
if (iR == 1)
System.out.println("Good!");

}
catch(NoSuchAlgorithmException e1) {
System.out.println("Error: NoSuchAlgorithmException");
}
catch(KeyException e2) {
System.out.println("Error: KeyException");
}

}

public static int desTest()throws NoSuchAlgorithmException, KeyException
{

int iRet = 1;
String s = new String("test1234567890");
byte[] byteTest = new byte[14];

s.getBytes (0, s.length(),byteTest, 0) ;

SecureRandom random = new SecureRandom();
KeyGenerator keygen = KeyGenerator.getInstance("DES");
keygen.initialize(random);
Key key = keygen.generateKey();
Cipher des = Cipher.getInstance("DES/ECB/PKCS#5");
des.initEncrypt(key);

byte[] ciphertext = des.crypt(byteTest);

des.initDecrypt(key);

byte[] decrypted = des.crypt(ciphertext);

for (int i = 0; i < byteTest.length; i++){
if (decrypted[i] != byteTest[i])
iRet = 0;
}

return iRet;

}

}

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