package de.pixart.messenger.utils; import android.os.Bundle; import android.util.Base64; import android.util.Pair; import org.bouncycastle.asn1.x500.X500Name; import org.bouncycastle.asn1.x500.style.BCStyle; import org.bouncycastle.asn1.x500.style.IETFUtils; import org.bouncycastle.cert.jcajce.JcaX509CertificateHolder; import java.net.MalformedURLException; import java.net.URL; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.security.SecureRandom; import java.security.cert.CertificateEncodingException; import java.security.cert.CertificateParsingException; import java.security.cert.X509Certificate; import java.text.Normalizer; import java.util.ArrayList; import java.util.Arrays; import java.util.Collection; import java.util.Iterator; import java.util.LinkedHashSet; import java.util.List; import java.util.regex.Pattern; import de.pixart.messenger.Config; import de.pixart.messenger.R; import de.pixart.messenger.entities.Account; import de.pixart.messenger.entities.Message; import de.pixart.messenger.http.AesGcmURLStreamHandler; import de.pixart.messenger.xmpp.jid.InvalidJidException; import de.pixart.messenger.xmpp.jid.Jid; public final class CryptoHelper { public static final String FILETRANSFER = "?FILETRANSFERv1:"; private final static char[] hexArray = "0123456789abcdef".toCharArray(); public static final Pattern UUID_PATTERN = Pattern.compile("[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}"); final public static byte[] ONE = new byte[]{0, 0, 0, 1}; 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 byte[] hexToBytes(String hexString) { int len = hexString.length(); byte[] array = new byte[len / 2]; for (int i = 0; i < len; i += 2) { array[i / 2] = (byte) ((Character.digit(hexString.charAt(i), 16) << 4) + Character .digit(hexString.charAt(i + 1), 16)); } return array; } public static String hexToString(final String hexString) { return new String(hexToBytes(hexString)); } public 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; } /** * Escapes usernames or passwords for SASL. */ public static String saslEscape(final String s) { final StringBuilder sb = new StringBuilder((int) (s.length() * 1.1)); for (int i = 0; i < s.length(); i++) { char c = s.charAt(i); switch (c) { case ',': sb.append("=2C"); break; case '=': sb.append("=3D"); break; default: sb.append(c); break; } } return sb.toString(); } public static String saslPrep(final String s) { return Normalizer.normalize(s, Normalizer.Form.NFKC); } public static String random(int length, SecureRandom random) { final byte[] bytes = new byte[length]; random.nextBytes(bytes); return Base64.encodeToString(bytes, Base64.NO_PADDING | Base64.NO_WRAP); } public static String prettifyFingerprint(String fingerprint) { if (fingerprint == null) { return ""; } else if (fingerprint.length() < 40) { return fingerprint; } StringBuilder builder = new StringBuilder(fingerprint); for (int i = 8; i < builder.length(); i += 9) { builder.insert(i, ' '); } return builder.toString(); } public static String prettifyFingerprintCert(String fingerprint) { StringBuilder builder = new StringBuilder(fingerprint); for (int i = 2; i < builder.length(); i += 3) { builder.insert(i, ':'); } return builder.toString(); } public static String[] getOrderedCipherSuites(final String[] platformSupportedCipherSuites) { final Collection cipherSuites = new LinkedHashSet<>(Arrays.asList(Config.ENABLED_CIPHERS)); final List platformCiphers = Arrays.asList(platformSupportedCipherSuites); cipherSuites.retainAll(platformCiphers); cipherSuites.addAll(platformCiphers); filterWeakCipherSuites(cipherSuites); return cipherSuites.toArray(new String[cipherSuites.size()]); } private static void filterWeakCipherSuites(final Collection cipherSuites) { final Iterator it = cipherSuites.iterator(); while (it.hasNext()) { String cipherName = it.next(); // remove all ciphers with no or very weak encryption or no authentication for (String weakCipherPattern : Config.WEAK_CIPHER_PATTERNS) { if (cipherName.contains(weakCipherPattern)) { it.remove(); break; } } } } public static Pair extractJidAndName(X509Certificate certificate) throws CertificateEncodingException, InvalidJidException, CertificateParsingException { Collection> alternativeNames = certificate.getSubjectAlternativeNames(); List emails = new ArrayList<>(); if (alternativeNames != null) { for (List san : alternativeNames) { Integer type = (Integer) san.get(0); if (type == 1) { emails.add((String) san.get(1)); } } } X500Name x500name = new JcaX509CertificateHolder(certificate).getSubject(); if (emails.size() == 0 && x500name.getRDNs(BCStyle.EmailAddress).length > 0) { emails.add(IETFUtils.valueToString(x500name.getRDNs(BCStyle.EmailAddress)[0].getFirst().getValue())); } String name = x500name.getRDNs(BCStyle.CN).length > 0 ? IETFUtils.valueToString(x500name.getRDNs(BCStyle.CN)[0].getFirst().getValue()) : null; if (emails.size() >= 1) { return new Pair<>(Jid.fromString(emails.get(0)), name); } else if (name != null) { try { Jid jid = Jid.fromString(name); if (jid.isBareJid() && !jid.isDomainJid()) { return new Pair<>(jid, null); } } catch (InvalidJidException e) { return null; } } return null; } public static Bundle extractCertificateInformation(X509Certificate certificate) { Bundle information = new Bundle(); try { JcaX509CertificateHolder holder = new JcaX509CertificateHolder(certificate); X500Name subject = holder.getSubject(); try { information.putString("subject_cn", subject.getRDNs(BCStyle.CN)[0].getFirst().getValue().toString()); } catch (Exception e) { //ignored } try { information.putString("subject_o", subject.getRDNs(BCStyle.O)[0].getFirst().getValue().toString()); } catch (Exception e) { //ignored } X500Name issuer = holder.getIssuer(); try { information.putString("issuer_cn", issuer.getRDNs(BCStyle.CN)[0].getFirst().getValue().toString()); } catch (Exception e) { //ignored } try { information.putString("issuer_o", issuer.getRDNs(BCStyle.O)[0].getFirst().getValue().toString()); } catch (Exception e) { //ignored } try { information.putString("sha1", getFingerprintCert(certificate.getEncoded())); } catch (Exception e) { } return information; } catch (CertificateEncodingException e) { return information; } } public static String getFingerprintCert(byte[] input) throws NoSuchAlgorithmException { MessageDigest md = MessageDigest.getInstance("SHA-1"); byte[] fingerprint = md.digest(input); return prettifyFingerprintCert(bytesToHex(fingerprint)); } public static String getAccountFingerprint(Account account) { return getFingerprint(account.getJid().toBareJid().toString()); } public static String getFingerprint(String value) { try { MessageDigest md = MessageDigest.getInstance("SHA-256"); return bytesToHex(md.digest(value.getBytes("UTF-8"))); } catch (Exception e) { return ""; } } public static int encryptionTypeToText(int encryption) { switch (encryption) { case Message.ENCRYPTION_OTR: return R.string.encryption_choice_otr; case Message.ENCRYPTION_AXOLOTL: return R.string.encryption_choice_omemo; case Message.ENCRYPTION_NONE: return R.string.encryption_choice_unencrypted; default: return R.string.encryption_choice_pgp; } } public static URL toAesGcmUrl(URL url) { if (!url.getProtocol().equalsIgnoreCase("https")) { return url; } try { return new URL(AesGcmURLStreamHandler.PROTOCOL_NAME + url.toString().substring(url.getProtocol().length())); } catch (MalformedURLException e) { return url; } } public static URL toHttpsUrl(URL url) { if (!url.getProtocol().equalsIgnoreCase(AesGcmURLStreamHandler.PROTOCOL_NAME)) { return url; } try { return new URL("https" + url.toString().substring(url.getProtocol().length())); } catch (MalformedURLException e) { return url; } } public static boolean isPgpEncryptedUrl(String url) { if (url == null) { return false; } final String u = url.toLowerCase(); return !u.contains(" ") && (u.startsWith("https://") || u.startsWith("http://")) && u.endsWith(".pgp"); } }