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package eu.siacs.conversations.utils;
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) {
byte[] userBytes = username.getBytes();
int userLenght = userBytes.length;
byte[] passwordBytes = password.getBytes();
byte[] saslBytes = new byte[userBytes.length+passwordBytes.length+2];
saslBytes[0] = 0x0;
for(int i = 1; i < saslBytes.length; ++i) {
if (i<=userLenght) {
saslBytes[i] = userBytes[i-1];
} else if (i==userLenght+1) {
saslBytes[i] = 0x0;
} else {
saslBytes[i] = passwordBytes[i-(userLenght+2)];
}
}
return Base64.encodeToString(saslBytes, Base64.DEFAULT);
}
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();
}
}
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