Fix validation

SignalServiceKit/src/Messages/OWSMessageDecrypter.m

@@ -197,7 +197,7 @@ NSError *EnsureDecryptError(NSError *_Nullable error, NSString *fallbackErrorDes
         OWSLogInfo(@"decrypting envelope: %@", [self descriptionForEnvelope:envelope]);
 
         if (envelope.type != SSKProtoEnvelopeTypeUnidentifiedSender) {
-            if (!envelope.hasSource || envelope.source.length < 1 /*|| !envelope.source.isValidE164*/) {
+            if (!envelope.hasSource || envelope.source.length < 1 || ![ECKeyPair isValidHexEncodedPublicKeyWithCandidate:envelope.source]) {
                 OWSFailDebug(@"incoming envelope has invalid source");
                 return failureBlock();
             }

SignalServiceKit/src/Messages/OWSMessageManager.m

@@ -248,7 +248,7 @@ NS_ASSUME_NONNULL_BEGIN
 
     OWSLogInfo(@"handling decrypted envelope: %@", [self descriptionForEnvelope:envelope]);
 
-    if (!envelope.hasSource || envelope.source.length < 1 /*|| !envelope.source.isValidE164*/) {
+    if (!envelope.hasSource || envelope.source.length < 1 || ![ECKeyPair isValidHexEncodedPublicKeyWithCandidate:envelope.source]) {
         OWSFailDebug(@"incoming envelope has invalid source");
         return;
     }