import java.io.*;
import java.security.*;
public class Protection {
public static byte[] makeDigest(byte[] mush, long t2, double q2)
throws NoSuchAlgorithmException {
MessageDigest md = MessageDigest.getInstance("SHA");
md.update(mush);
md.update(makeBytes(t2, q2));
return md.digest();
}
public static byte[] makeDigest(String user, String password,
long t1, double q1) throws NoSuchAlgorithmException {
MessageDigest md = MessageDigest.getInstance("SHA");
md.update(user.getBytes());
md.update(password.getBytes());
md.update(makeBytes(t1, q1));
return md.digest();
}
public static byte[] makeBytes(long t, double q) {
try {
ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
DataOutputStream dataOut = new DataOutputStream(byteOut);
dataOut.writeLong(t);
dataOut.writeDouble(q);
return byteOut.toByteArray();
}
catch (IOException e) {
return new byte[0];
}
}
} |