nmode's Git Repositories - signal-cli/blob - lib/src/main/java/org/asamk/signal/manager/util/ProfileUtils.java

   1 package org.asamk.signal.manager.util;
   2
   3 import org.asamk.signal.manager.storage.recipients.Profile;
   4 import org.signal.zkgroup.profiles.ProfileKey;
   5 import org.whispersystems.libsignal.util.Pair;
   6 import org.whispersystems.signalservice.api.crypto.InvalidCiphertextException;
   7 import org.whispersystems.signalservice.api.crypto.ProfileCipher;
   8 import org.whispersystems.signalservice.api.profiles.SignalServiceProfile;
   9
  10 import java.util.Base64;
  11 import java.util.HashSet;
  12
  13 public class ProfileUtils {
  14
  15     public static Profile decryptProfile(
  16             final ProfileKey profileKey, final SignalServiceProfile encryptedProfile
  17     ) {
  18         var profileCipher = new ProfileCipher(profileKey);
  19         try {
  20             var name = decrypt(encryptedProfile.getName(), profileCipher);
  21             var about = trimZeros(decrypt(encryptedProfile.getAbout(), profileCipher));
  22             var aboutEmoji = trimZeros(decrypt(encryptedProfile.getAboutEmoji(), profileCipher));
  23
  24             final var nameParts = splitName(name);
  25             return new Profile(System.currentTimeMillis(),
  26                     nameParts.first(),
  27                     nameParts.second(),
  28                     about,
  29                     aboutEmoji,
  30                     encryptedProfile.getAvatar(),
  31                     getUnidentifiedAccessMode(encryptedProfile, profileCipher),
  32                     getCapabilities(encryptedProfile));
  33         } catch (InvalidCiphertextException e) {
  34             return null;
  35         }
  36     }
  37
  38     public static Profile.UnidentifiedAccessMode getUnidentifiedAccessMode(
  39             final SignalServiceProfile encryptedProfile, final ProfileCipher profileCipher
  40     ) {
  41         if (encryptedProfile.isUnrestrictedUnidentifiedAccess()) {
  42             return Profile.UnidentifiedAccessMode.UNRESTRICTED;
  43         }
  44
  45         if (encryptedProfile.getUnidentifiedAccess() != null && profileCipher != null) {
  46             final var unidentifiedAccessVerifier = Base64.getDecoder().decode(encryptedProfile.getUnidentifiedAccess());
  47             if (profileCipher.verifyUnidentifiedAccess(unidentifiedAccessVerifier)) {
  48                 return Profile.UnidentifiedAccessMode.ENABLED;
  49             }
  50         }
  51
  52         return Profile.UnidentifiedAccessMode.DISABLED;
  53     }
  54
  55     public static HashSet<Profile.Capability> getCapabilities(final SignalServiceProfile encryptedProfile) {
  56         final var capabilities = new HashSet<Profile.Capability>();
  57         if (encryptedProfile.getCapabilities().isGv1Migration()) {
  58             capabilities.add(Profile.Capability.gv1Migration);
  59         }
  60         if (encryptedProfile.getCapabilities().isGv2()) {
  61             capabilities.add(Profile.Capability.gv2);
  62         }
  63         if (encryptedProfile.getCapabilities().isStorage()) {
  64             capabilities.add(Profile.Capability.storage);
  65         }
  66         if (encryptedProfile.getCapabilities().isSenderKey()) {
  67             capabilities.add(Profile.Capability.senderKey);
  68         }
  69         if (encryptedProfile.getCapabilities().isAnnouncementGroup()) {
  70             capabilities.add(Profile.Capability.announcementGroup);
  71         }
  72
  73         return capabilities;
  74     }
  75
  76     private static String decrypt(
  77             final String encryptedName, final ProfileCipher profileCipher
  78     ) throws InvalidCiphertextException {
  79         try {
  80             return encryptedName == null
  81                     ? null
  82                     : new String(profileCipher.decrypt(Base64.getDecoder().decode(encryptedName)));
  83         } catch (IllegalArgumentException e) {
  84             return null;
  85         }
  86     }
  87
  88     private static Pair<String, String> splitName(String name) {
  89         if (name == null) {
  90             return new Pair<>(null, null);
  91         }
  92         String[] parts = name.split("\0");
  93
  94         return switch (parts.length) {
  95             case 0 -> new Pair<>(null, null);
  96             case 1 -> new Pair<>(parts[0], null);
  97             default -> new Pair<>(parts[0], parts[1]);
  98         };
  99     }
 100
 101     static String trimZeros(String str) {
 102         if (str == null) {
 103             return null;
 104         }
 105
 106         int pos = str.indexOf(0);
 107         return pos == -1 ? str : str.substring(0, pos);
 108     }
 109 }