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/*
* Copyright (C) 2012-2013 Dominik Schürmann <dominik@dominikschuermann.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.sufficientlysecure.keychain.helper;
import android.graphics.Color;
import android.os.Bundle;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.style.ForegroundColorSpan;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.util.Log;
import java.security.DigestException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Iterator;
import java.util.Set;
public class OtherHelper {
/**
* Logs bundle content to debug for inspecting the content
*
* @param bundle
* @param bundleName
*/
public static void logDebugBundle(Bundle bundle, String bundleName) {
if (Constants.DEBUG) {
if (bundle != null) {
Set<String> ks = bundle.keySet();
Iterator<String> iterator = ks.iterator();
Log.d(Constants.TAG, "Bundle " + bundleName + ":");
Log.d(Constants.TAG, "------------------------------");
while (iterator.hasNext()) {
String key = iterator.next();
Object value = bundle.get(key);
if (value != null) {
Log.d(Constants.TAG, key + " : " + value.toString());
} else {
Log.d(Constants.TAG, key + " : null");
}
}
Log.d(Constants.TAG, "------------------------------");
} else {
Log.d(Constants.TAG, "Bundle " + bundleName + ": null");
}
}
}
public static SpannableStringBuilder colorizeFingerprint(String fingerprint) {
SpannableStringBuilder sb = new SpannableStringBuilder(fingerprint);
try {
// for each 4 characters of the fingerprint + 1 space
for (int i = 0; i < fingerprint.length(); i += 5) {
int spanEnd = Math.min(i + 4, fingerprint.length());
String fourChars = fingerprint.substring(i, spanEnd);
int raw = Integer.parseInt(fourChars, 16);
byte[] bytes = {(byte) ((raw >> 8) & 0xff - 128), (byte) (raw & 0xff - 128)};
int[] color = OtherHelper.getRgbForData(bytes);
int r = color[0];
int g = color[1];
int b = color[2];
// we cannot change black by multiplication, so adjust it to an almost-black grey,
// which will then be brightened to the minimal brightness level
if (r == 0 && g == 0 && b == 0) {
r = 1;
g = 1;
b = 1;
}
// Convert rgb to brightness
double brightness = 0.2126 * r + 0.7152 * g + 0.0722 * b;
// If a color is too dark to be seen on black,
// then brighten it up to a minimal brightness.
if (brightness < 80) {
double factor = 80.0 / brightness;
r = Math.min(255, (int) (r * factor));
g = Math.min(255, (int) (g * factor));
b = Math.min(255, (int) (b * factor));
// If it is too light, then darken it to a respective maximal brightness.
} else if (brightness > 180) {
double factor = 180.0 / brightness;
r = (int) (r * factor);
g = (int) (g * factor);
b = (int) (b * factor);
}
// Create a foreground color with the 3 digest integers as RGB
// and then converting that int to hex to use as a color
sb.setSpan(new ForegroundColorSpan(Color.rgb(r, g, b)),
i, spanEnd, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
}
} catch (Exception e) {
Log.e(Constants.TAG, "Colorization failed", e);
// if anything goes wrong, then just display the fingerprint without colour,
// instead of partially correct colour or wrong colours
return new SpannableStringBuilder(fingerprint);
}
return sb;
}
/**
* Converts the given bytes to a unique RGB color using SHA1 algorithm
*
* @param bytes
* @return an integer array containing 3 numeric color representations (Red, Green, Black)
* @throws NoSuchAlgorithmException
* @throws DigestException
*/
public static int[] getRgbForData(byte[] bytes) throws NoSuchAlgorithmException, DigestException {
MessageDigest md = MessageDigest.getInstance("SHA1");
md.update(bytes);
byte[] digest = md.digest();
int[] result = {((int) digest[0] + 256) % 256,
((int) digest[1] + 256) % 256,
((int) digest[2] + 256) % 256};
return result;
}
}
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