112 lines
3.8 KiB
Java
112 lines
3.8 KiB
Java
package eu.siacs.conversations.utils;
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import java.math.BigInteger;
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import java.nio.charset.Charset;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import java.security.SecureRandom;
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import java.util.Random;
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import eu.siacs.conversations.entities.Account;
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import android.util.Base64;
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import android.util.Log;
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public class CryptoHelper {
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final protected static char[] hexArray = "0123456789ABCDEF".toCharArray();
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final protected static char[] vowels = "aeiou".toCharArray();
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final protected static char[] consonants = "bcdfghjklmnpqrstvwxyz"
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.toCharArray();
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public static String bytesToHex(byte[] bytes) {
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char[] hexChars = new char[bytes.length * 2];
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for (int j = 0; j < bytes.length; j++) {
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int v = bytes[j] & 0xFF;
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hexChars[j * 2] = hexArray[v >>> 4];
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hexChars[j * 2 + 1] = hexArray[v & 0x0F];
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}
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return new String(hexChars).toLowerCase();
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}
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public static String saslPlain(String username, String password) {
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String sasl = '\u0000' + username + '\u0000' + password;
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return Base64.encodeToString(sasl.getBytes(Charset.defaultCharset()),
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Base64.NO_WRAP);
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}
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private static byte[] concatenateByteArrays(byte[] a, byte[] b) {
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byte[] result = new byte[a.length + b.length];
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System.arraycopy(a, 0, result, 0, a.length);
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System.arraycopy(b, 0, result, a.length, b.length);
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return result;
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}
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public static String saslDigestMd5(Account account, String challenge) {
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try {
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Random random = new SecureRandom();
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Log.d("xmppService",
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"challenge="
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+ new String(Base64.decode(challenge,
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Base64.DEFAULT)));
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String[] challengeParts = new String(Base64.decode(challenge,
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Base64.DEFAULT)).split(",");
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String nonce = "";
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for (int i = 0; i < challengeParts.length; ++i) {
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String[] parts = challengeParts[i].split("=");
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if (parts[0].equals("nonce")) {
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nonce = parts[1].replace("\"", "");
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} else if (parts[0].equals("rspauth")) {
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return null;
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}
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}
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String digestUri = "xmpp/"+account.getServer();
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String nonceCount = "00000001";
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String x = account.getUsername() + ":" + account.getServer() + ":"
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+ account.getPassword();
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MessageDigest md = MessageDigest.getInstance("MD5");
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byte[] y = md
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.digest(x.getBytes(Charset.defaultCharset()));
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String cNonce = new BigInteger(100, random).toString(32);
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Log.d("xmppService", "conce=" + cNonce);
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byte[] a1 = concatenateByteArrays(y,(":"+nonce+":"+cNonce).getBytes(Charset.defaultCharset()));
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String a2 = "AUTHENTICATE:"+digestUri;
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String ha1 = bytesToHex(md.digest(a1));
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String ha2 = bytesToHex(md.digest(a2.getBytes(Charset
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.defaultCharset())));
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String kd = ha1 + ":" + nonce + ":"+nonceCount+":" + cNonce + ":auth:"
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+ ha2;
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Log.d("xmppService", "kd=" + kd);
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String response = bytesToHex(md.digest(kd.getBytes(Charset
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.defaultCharset())));
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String saslString = "username=\"" + account.getUsername()
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+ "\",realm=\"" + account.getServer() + "\",nonce=\""
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+ nonce + "\",cnonce=\"" + cNonce
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+ "\",nc="+nonceCount+",qop=auth,digest-uri=\""+digestUri+"\",response=" + response
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+ ",charset=utf-8,authzid=\"" + account.getJid() + "\"";
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Log.d("xmppService", "saslString=" + saslString);
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return Base64.encodeToString(
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saslString.getBytes(Charset.defaultCharset()),
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Base64.NO_WRAP);
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} catch (NoSuchAlgorithmException e) {
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return null;
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}
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}
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public static String randomMucName() {
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Random random = new SecureRandom();
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return randomWord(3, random) + "." + randomWord(7, random);
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}
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protected static String randomWord(int lenght, Random random) {
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StringBuilder builder = new StringBuilder(lenght);
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for (int i = 0; i < lenght; ++i) {
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if (i % 2 == 0) {
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builder.append(consonants[random.nextInt(consonants.length)]);
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} else {
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builder.append(vowels[random.nextInt(vowels.length)]);
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}
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}
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return builder.toString();
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}
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}
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