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package org.theb.ssh;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.graphics.Paint.FontMetrics;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
public class TouchEntropy extends Activity {
protected String mEntropy;
@Override
protected void onCreate(Bundle icicle) {
super.onCreate(icicle);
mEntropy = new String();
setContentView(new TouchView(this));
}
class TouchView extends View {
Paint mPaint;
FontMetrics mFontMetrics;
private boolean mFlipFlop = false;
private long mLastTime = 0;
public TouchView(Context c) {
super(c);
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setTypeface(Typeface.DEFAULT);
mPaint.setTextAlign(Paint.Align.CENTER);
mPaint.setTextSize(16);
mPaint.setColor(Color.WHITE);
mFontMetrics = mPaint.getFontMetrics();
}
@Override
public void onDraw(Canvas c) {
String prompt = getResources().getString(R.string.prompt_touch);
c.drawText(prompt + " " + (int)(100.0 * (mEntropy.length() / 20.0)) + "% done",
getWidth() / 2,
getHeight() / 2 - (mFontMetrics.ascent + mFontMetrics.descent) / 2,
mPaint);
}
@Override
public boolean onMotionEvent(MotionEvent event) {
// Only get entropy every 200 milliseconds to ensure the user has moved around.
long now = System.currentTimeMillis();
if ((now - mLastTime) < 200)
return true;
else
mLastTime = now;
Log.d("SSH", "Last time was " + mLastTime);
// Get the lowest 4 bits of each X, Y input and concat to the entropy-gathering
// string.
if (mFlipFlop)
mEntropy += (byte)(((int)event.getX() & 0xF0) | ((int)event.getY() & 0x0F));
else
mEntropy += (byte)(((int)event.getY() & 0xF0) | ((int)event.getX() & 0x0F));
mFlipFlop = !mFlipFlop;
// SHA1PRNG only keeps 20 bytes (160 bits) of entropy.
if (mEntropy.length() > 20) {
TouchEntropy.this.setResult(RESULT_OK, mEntropy);
TouchEntropy.this.finish();
}
invalidate();
return true;
}
}
}
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