diff options
Diffstat (limited to 'src/eu/siacs/conversations/utils/CryptoHelper.java')
| -rw-r--r-- | src/eu/siacs/conversations/utils/CryptoHelper.java | 96 |
1 files changed, 82 insertions, 14 deletions
diff --git a/src/eu/siacs/conversations/utils/CryptoHelper.java b/src/eu/siacs/conversations/utils/CryptoHelper.java index 74f942bf..08a65992 100644 --- a/src/eu/siacs/conversations/utils/CryptoHelper.java +++ b/src/eu/siacs/conversations/utils/CryptoHelper.java @@ -1,37 +1,105 @@ package eu.siacs.conversations.utils; +import java.math.BigInteger; import java.nio.charset.Charset; +import java.security.MessageDigest; +import java.security.NoSuchAlgorithmException; import java.security.SecureRandom; import java.util.Random; +import eu.siacs.conversations.entities.Account; + import android.util.Base64; +import android.util.Log; public class CryptoHelper { final protected static char[] hexArray = "0123456789ABCDEF".toCharArray(); final protected static char[] vowels = "aeiou".toCharArray(); - final protected static char[] consonants ="bcdfghjklmnpqrstvwxyz".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); + 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).toLowerCase(); } + public static String saslPlain(String username, String password) { - String sasl = '\u0000'+username + '\u0000' + password; - return Base64.encodeToString(sasl.getBytes(Charset.defaultCharset()),Base64.NO_WRAP); + String sasl = '\u0000' + username + '\u0000' + password; + return Base64.encodeToString(sasl.getBytes(Charset.defaultCharset()), + Base64.NO_WRAP); } + + private static byte[] concatenateByteArrays(byte[] a, byte[] b) { + byte[] result = new byte[a.length + b.length]; + System.arraycopy(a, 0, result, 0, a.length); + System.arraycopy(b, 0, result, a.length, b.length); + return result; + } + public static String saslDigestMd5(Account account, String challenge) { + try { + Random random = new SecureRandom(); + Log.d("xmppService", + "challenge=" + + new String(Base64.decode(challenge, + Base64.DEFAULT))); + String[] challengeParts = new String(Base64.decode(challenge, + Base64.DEFAULT)).split(","); + String nonce = ""; + for (int i = 0; i < challengeParts.length; ++i) { + String[] parts = challengeParts[i].split("="); + if (parts[0].equals("nonce")) { + nonce = parts[1].replace("\"", ""); + } else if (parts[0].equals("rspauth")) { + return null; + } + } + String digestUri = "xmpp/"+account.getServer(); + String nonceCount = "00000001"; + String x = account.getUsername() + ":" + account.getServer() + ":" + + account.getPassword(); + MessageDigest md = MessageDigest.getInstance("MD5"); + byte[] y = md + .digest(x.getBytes(Charset.defaultCharset())); + String cNonce = new BigInteger(100, random).toString(32); + Log.d("xmppService", "conce=" + cNonce); + byte[] a1 = concatenateByteArrays(y,(":"+nonce+":"+cNonce).getBytes(Charset.defaultCharset())); + String a2 = "AUTHENTICATE:"+digestUri; + String ha1 = bytesToHex(md.digest(a1)); + String ha2 = bytesToHex(md.digest(a2.getBytes(Charset + .defaultCharset()))); + String kd = ha1 + ":" + nonce + ":"+nonceCount+":" + cNonce + ":auth:" + + ha2; + Log.d("xmppService", "kd=" + kd); + String response = bytesToHex(md.digest(kd.getBytes(Charset + .defaultCharset()))); + String saslString = "username=\"" + account.getUsername() + + "\",realm=\"" + account.getServer() + "\",nonce=\"" + + nonce + "\",cnonce=\"" + cNonce + + "\",nc="+nonceCount+",qop=auth,digest-uri=\""+digestUri+"\",response=" + response + + ",charset=utf-8,authzid=\"" + account.getJid() + "\""; + Log.d("xmppService", "saslString=" + saslString); + return Base64.encodeToString( + saslString.getBytes(Charset.defaultCharset()), + Base64.NO_WRAP); + } catch (NoSuchAlgorithmException e) { + return null; + } + } + public static String randomMucName() { Random random = new SecureRandom(); - return randomWord(3,random)+"."+randomWord(7,random); + return randomWord(3, random) + "." + randomWord(7, random); } - - protected static String randomWord(int lenght,Random random) { + + protected static String randomWord(int lenght, Random random) { StringBuilder builder = new StringBuilder(lenght); - for(int i = 0; i < lenght; ++i) { + for (int i = 0; i < lenght; ++i) { if (i % 2 == 0) { builder.append(consonants[random.nextInt(consonants.length)]); } else { |