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package cgeo.geocaching.utils;
import cgeo.geocaching.Settings;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.util.Log;
import java.math.BigInteger;
import java.security.MessageDigest;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
public final class CryptUtils {
public static String rot13(String text) {
if (text == null) {
return "";
}
final StringBuilder result = new StringBuilder();
// plaintext flag (do not convert)
boolean plaintext = false;
final int length = text.length();
int c;
int capitalized;
for (int index = 0; index < length; index++) {
c = text.charAt(index);
if (c == '[') {
plaintext = true;
} else if (c == ']') {
plaintext = false;
} else if (!plaintext) {
capitalized = c & 32;
c &= ~capitalized;
c = ((c >= 'A') && (c <= 'Z') ? ((c - 'A' + 13) % 26 + 'A') : c)
| capitalized;
}
result.append((char) c);
}
return result.toString();
}
public static String md5(String text) {
String hashed = "";
try {
final MessageDigest digest = MessageDigest.getInstance("MD5");
digest.update(text.getBytes(), 0, text.length());
hashed = new BigInteger(1, digest.digest()).toString(16);
} catch (Exception e) {
Log.e(Settings.tag, "cgBase.md5: " + e.toString());
}
return hashed;
}
public static String sha1(String text) {
String hashed = "";
try {
final MessageDigest digest = MessageDigest.getInstance("SHA-1");
digest.update(text.getBytes(), 0, text.length());
hashed = new BigInteger(1, digest.digest()).toString(16);
} catch (Exception e) {
Log.e(Settings.tag, "cgBase.sha1: " + e.toString());
}
return hashed;
}
public static byte[] hashHmac(String text, String salt) {
byte[] macBytes = {};
try {
final SecretKeySpec secretKeySpec = new SecretKeySpec(salt.getBytes(), "HmacSHA1");
final Mac mac = Mac.getInstance("HmacSHA1");
mac.init(secretKeySpec);
macBytes = mac.doFinal(text.getBytes());
} catch (Exception e) {
Log.e(Settings.tag, "cgBase.hashHmac: " + e.toString());
}
return macBytes;
}
public static CharSequence rot13(final Spannable span) {
// I needed to re-implement the rot13(String) encryption here because we must work on
// a SpannableStringBuilder instead of the pure text and we must replace each character inline.
// Otherwise we loose all the images, colors and so on...
final SpannableStringBuilder buffer = new SpannableStringBuilder(span);
boolean plaintext = false;
final int length = span.length();
int c;
int capitalized;
for (int index = 0; index < length; index++) {
c = span.charAt(index);
if (c == '[') {
plaintext = true;
} else if (c == ']') {
plaintext = false;
} else if (!plaintext) {
capitalized = c & 32;
c &= ~capitalized;
c = ((c >= 'A') && (c <= 'Z') ? ((c - 'A' + 13) % 26 + 'A') : c)
| capitalized;
}
buffer.replace(index, index + 1, String.valueOf((char) c));
}
return buffer;
}
}
|
