package eu.siacs.conversations.utils; import java.nio.charset.Charset; import java.security.SecureRandom; import java.util.Random; import android.util.Base64; public class CryptoHelper { final protected static char[] hexArray = "0123456789ABCDEF".toCharArray(); final protected static char[] vowels = "aeiou".toCharArray(); final protected static char[] consonants ="bcdfghjklmnpqrstvwxyz".toCharArray(); public static String bytesToHex(byte[] bytes) { char[] hexChars = new char[bytes.length * 2]; for ( int j = 0; j < bytes.length; j++ ) { int v = bytes[j] & 0xFF; hexChars[j * 2] = hexArray[v >>> 4]; hexChars[j * 2 + 1] = hexArray[v & 0x0F]; } return new String(hexChars); } public static String saslPlain(String username, String password) { String sasl = '\u0000'+username + '\u0000' + password; return Base64.encodeToString(sasl.getBytes(Charset.defaultCharset()),Base64.NO_WRAP); } public static String randomMucName() { Random random = new SecureRandom(); return randomWord(3,random)+"."+randomWord(7,random); } protected static String randomWord(int lenght,Random random) { StringBuilder builder = new StringBuilder(lenght); for(int i = 0; i < lenght; ++i) { if (i % 2 == 0) { builder.append(consonants[random.nextInt(consonants.length)]); } else { builder.append(vowels[random.nextInt(vowels.length)]); } } return builder.toString(); } }