Add share public key button

Signal/src/ViewControllers/AppSettings/AppSettingsViewController.m

@@ -223,6 +223,12 @@
                                               }]];
 #endif
 
+    [section
+     addItem:[self destructiveButtonItemWithTitle:NSLocalizedString(@"Share Public Key", @"")
+                          accessibilityIdentifier:ACCESSIBILITY_IDENTIFIER_WITH_NAME(self, @"share_public_key")
+                                         selector:@selector(sharePublicKey)
+                                            color:[UIColor ows_materialBlueColor]]];
+    
     if (TSAccountManager.sharedInstance.isDeregistered) {
         [section addItem:[self destructiveButtonItemWithTitle:NSLocalizedString(@"SETTINGS_REREGISTER_BUTTON",
                                                                   @"Label for re-registration button.")
@@ -471,6 +477,13 @@
     }
 }
 
+- (void)sharePublicKey
+{
+    NSString *publicKey = OWSIdentityManager.sharedManager.identityKeyPair.hexEncodedPublicKey;
+    UIActivityViewController *shareVC = [[UIActivityViewController alloc] initWithActivityItems:@[ publicKey ] applicationActivities:nil];
+    [self presentViewController:shareVC animated:YES completion:nil];
+}
+
 - (void)reregisterUser
 {
     [RegistrationUtils showReregistrationUIFromViewController:self];

Signal/translations/en.lproj/Localizable.strings

@@ -2570,3 +2570,4 @@
 "No search results" = "No search results";
 "Calculating proof of work" = "Calculating proof of work";
 "Failed to calculate proof of work." = "Failed to calculate proof of work.";
+"Share Public Key" = "Share Public Key";

SignalServiceKit/src/Loki/Extensions/ECKeyPair.swift

@@ -1,11 +1,11 @@
 
 public extension ECKeyPair {
     
-    var hexEncodedPrivateKey: String {
+    @objc var hexEncodedPrivateKey: String {
         return privateKey.map { String(format: "%02hhx", $0) }.joined()
     }
     
-    var hexEncodedPublicKey: String {
+    @objc var hexEncodedPublicKey: String {
         // Prefixing with "05" is necessary for what seems to be a sort of Signal public key versioning system
         return "05" + publicKey.map { String(format: "%02hhx", $0) }.joined()
     }