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Merge pull request #404 from uberspot/master

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Change colorizing of fingerprint to use SHA1 based on apg's commit 67ffc
This commit is contained in:
Dominik Schürmann 2014-03-12 22:12:51 +01:00
commit 65633112a0
2 changed files with 58 additions and 10 deletions
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22
OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/helper/OtherHelper.java
View File

@ -17,6 +17,9 @@
package org.sufficientlysecure.keychain.helper;
import java.security.DigestException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Iterator;
import java.util.Set;
@ -58,4 +61,23 @@ public class OtherHelper {
}
}
/**
* 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;
}
}

46
OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/ViewKeyMainFragment.java
View File

@ -29,6 +29,7 @@ import android.support.v4.content.Loader;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.format.DateFormat;
import android.text.style.BackgroundColorSpan;
import android.text.style.ForegroundColorSpan;
import android.view.LayoutInflater;
import android.view.View;
@ -40,6 +41,7 @@ import com.beardedhen.androidbootstrap.BootstrapButton;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.R;
import org.sufficientlysecure.keychain.helper.OtherHelper;
import org.sufficientlysecure.keychain.pgp.PgpKeyHelper;
import org.sufficientlysecure.keychain.provider.KeychainContract;
import org.sufficientlysecure.keychain.provider.ProviderHelper;
@ -47,6 +49,8 @@ import org.sufficientlysecure.keychain.ui.adapter.ViewKeyKeysAdapter;
import org.sufficientlysecure.keychain.ui.adapter.ViewKeyUserIdsAdapter;
import org.sufficientlysecure.keychain.util.Log;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Date;
@ -276,18 +280,40 @@ public class ViewKeyMainFragment extends Fragment implements
private SpannableStringBuilder colorizeFingerprint(String fingerprint) {
SpannableStringBuilder sb = new SpannableStringBuilder(fingerprint);
ForegroundColorSpan fcs = new ForegroundColorSpan(Color.BLACK);
try {
// for each 4 characters of the fingerprint + 1 space
for (int i = 0; i < fingerprint.length(); i += 5) {
int minFingLength = Math.min(i + 4, fingerprint.length());
String fourChars = fingerprint.substring(i, minFingLength);
// for each 4 characters of the fingerprint + 1 space
for (int i = 0; i < fingerprint.length(); i += 5) {
int minFingLength = Math.min(i + 4, fingerprint.length());
String fourChars = fingerprint.substring(i, minFingLength);
int raw = Integer.parseInt(fourChars, 16);
byte[] bytes = {(byte) ((raw >> 8) & 0xff - 128), (byte) (raw & 0xff - 128)};
int[] color = OtherHelper.getRgbForData(bytes);
// Create a foreground color by converting the 4 fingerprint chars to an int hashcode
// and then converting that int to hex to use as a color
fcs = new ForegroundColorSpan(
Color.parseColor(String.format("#%06X", (0xFFFFFF & fourChars.hashCode()))));
sb.setSpan(fcs, i, minFingLength, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
// Convert rgb to brightness
int brightness = (int) (0.2126*color[0] + 0.7152*color[1] + 0.0722*color[2]);
// Detect dark colors and invert their background to white to make them more distinguishable
if (brightness < 40) {
sb.setSpan(new BackgroundColorSpan(Color.WHITE),
i, minFingLength, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
// Detect bright colors and invert their background to black to make them more distinguishable
} else if (brightness > 210) {
sb.setSpan(new BackgroundColorSpan(Color.BLACK),
i, minFingLength, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
}
// 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(color[0], color[1], color[2])),
i, minFingLength, 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;