1package eu.siacs.conversations.utils;
 2
 3import java.nio.charset.Charset;
 4import java.security.SecureRandom;
 5import java.util.Random;
 6
 7import android.util.Base64;
 8import android.util.Log;
 9
10public class CryptoHelper {
11	final protected static char[] hexArray = "0123456789ABCDEF".toCharArray();
12	final protected static char[] vowels = "aeiou".toCharArray();
13	final protected static char[] consonants ="bcdfghjklmnpqrstvwxyz".toCharArray();
14	public static String bytesToHex(byte[] bytes) {
15	    char[] hexChars = new char[bytes.length * 2];
16	    for ( int j = 0; j < bytes.length; j++ ) {
17	        int v = bytes[j] & 0xFF;
18	        hexChars[j * 2] = hexArray[v >>> 4];
19	        hexChars[j * 2 + 1] = hexArray[v & 0x0F];
20	    }
21	    return new String(hexChars);
22	}
23	public static String saslPlain(String username, String password) {
24		String sasl = '\u0000'+username + '\u0000' + password;
25		return Base64.encodeToString(sasl.getBytes(Charset.defaultCharset()),Base64.DEFAULT);
26	}
27	
28	public static String randomMucName() {
29		Random random = new SecureRandom();
30		return randomWord(3,random)+"."+randomWord(7,random);
31	}
32	
33	protected static String randomWord(int lenght,Random random) {
34		StringBuilder builder = new StringBuilder(lenght);
35		for(int i = 0; i < lenght; ++i) {
36			if (i % 2 == 0) {
37				builder.append(consonants[random.nextInt(consonants.length)]);
38			} else {
39				builder.append(vowels[random.nextInt(vowels.length)]);
40			}
41		}
42		return builder.toString();
43	}
44}