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/* DigitalSignature.java */
import java.io.*;
import java.security.cert.Certificate;
import java.security.*;
public class DigitalSignature
{
static final String KEYSTORE = "c:\\windows\\.keystore";
static final char[] KSPASS = {'h','j','p','3','k','s'};
static final String ALIAS = "hjp3";
static final char[] KEYPASS = {'h','j','p','3','k','e','y'};
public static void main(String[] args)
{
try {
//Laden der Schl�sseldatenbank
KeyStore ks = KeyStore.getInstance("JKS");
FileInputStream ksin = new FileInputStream(KEYSTORE);
ks.load(ksin, KSPASS);
ksin.close();
//Privaten Schl�ssel "hjp3" lesen
Key key = ks.getKey(ALIAS, KEYPASS);
//Signatur-Objekt erstellen
Signature signature = Signature.getInstance("SHA/DSA");
signature.initSign((PrivateKey)key);
//Eingabedatei einlesen
FileInputStream in = new FileInputStream(args[0]);
int len;
byte[] data = new byte[1024];
while ((len = in.read(data)) > 0) {
//Signatur updaten
signature.update(data, 0, len);
}
in.close();
//Signatur berechnen
byte[] result = signature.sign();
//Signatur ausgeben
FileOutputStream out = new FileOutputStream(args[1]);
out.write(result, 0, result.length);
out.close();
} catch (Exception e) {
System.err.println(e.toString());
System.exit(1);
}
}
}
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