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/* Listing4803.java */
import java.io.*;
import java.security.*;
public class Listing4803
{
/**
* Konvertiert ein Byte in einen Hex-String.
*/
public static String toHexString(byte b)
{
int value = (b & 0x7F) + (b < 0 ? 128 : 0);
String ret = (value < 16 ? "0" : "");
ret += Integer.toHexString(value).toUpperCase();
return ret;
}
public static void main(String[] args)
{
if (args.length < 2) {
System.out.println(
"Usage: java Listing4803 md-algorithm filename"
);
System.exit(0);
}
try {
//MessageDigest erstellen
MessageDigest md = MessageDigest.getInstance(args[0]);
FileInputStream in = new FileInputStream(args[1]);
int len;
byte[] data = new byte[1024];
while ((len = in.read(data)) > 0) {
//MessageDigest updaten
md.update(data, 0, len);
}
in.close();
//MessageDigest berechnen und ausgeben
byte[] result = md.digest();
for (int i = 0; i < result.length; ++i) {
System.out.print(toHexString(result[i]) + " ");
}
System.out.println();
} catch (Exception e) {
System.err.println(e.toString());
System.exit(1);
}
}
}
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