DSA - different results with JDK 1.2.2 and 1.3.1
I have some code which we use to generate digital signatures.
We are looking to migrate JDK from 1.2.2 to 1.3.1. We are limited to these versions because we are using Oracle's JVM. I am getting different results when I run the same code under these different JDKs.
Has anyone got any ideas why this is the case?
The code is as follows:-
import java.io.*;
import java.security.*;
import java.security.spec.*;
import sun.misc.*;
class GenSig4 {
public static void main(String[] args) {
/* Generate a DSA signature */
if (args.length != 2) {
System.out.println("Usage: GenSig1 privateKeyFile nameOfFileToSign");
}
else try {
FileInputStream keyfis = new FileInputStream(args[0]);
byte[] encKey = new byte[keyfis.available()];
keyfis.read(encKey);
keyfis.close();
PKCS8EncodedKeySpec privKeySpec = new PKCS8EncodedKeySpec(encKey);
KeyFactory keyFactory = KeyFactory.getInstance("DSA");
PrivateKey privKey = keyFactory.generatePrivate(privKeySpec);
Signature dsa = Signature.getInstance("SHA1withDSA", "SUN");
dsa.initSign(privKey);
FileInputStream fis = new FileInputStream(args[1]);
BufferedInputStream bufin = new BufferedInputStream(fis);
byte[] buffer = new byte[1024];
int len;
while (bufin.available() != 0) {
len = bufin.read(buffer);
dsa.update(buffer, 0, len);
};
bufin.close();
byte[] realSig = dsa.sign();
/* save the signature in a file */
FileOutputStream sigfos = new FileOutputStream("sig");
sigfos.write(realSig);
sigfos.close();
//
// Get Base64 representation of signature from argument
//
String signature = new String();
BASE64Encoder encoder = new BASE64Encoder();
signature = encoder.encodeBuffer(realSig);
String hexStr="";
System.out.println( signature );
} catch (Exception e) {
System.err.println("Caught exception " + e.toString());
}
}
}
