diff --git a/SignalServiceKit/protobuf/OWSSignalServiceProtos.proto b/SignalServiceKit/protobuf/OWSSignalServiceProtos.proto
index 9124a1f9f..ab87cbf65 100644
--- a/SignalServiceKit/protobuf/OWSSignalServiceProtos.proto
+++ b/SignalServiceKit/protobuf/OWSSignalServiceProtos.proto
@@ -35,6 +35,7 @@ message Content {
   optional SyncMessage syncMessage = 2;
   optional CallMessage callMessage = 3;
   optional NullMessage nullMessage = 4;
+  optional string profileKey       = 5;
 }
 
 message NullMessage {
diff --git a/SignalServiceKit/src/Messages/OWSSignalServiceProtos.pb.h b/SignalServiceKit/src/Messages/OWSSignalServiceProtos.pb.h
index 03a6cc996..a7830d9e3 100644
--- a/SignalServiceKit/src/Messages/OWSSignalServiceProtos.pb.h
+++ b/SignalServiceKit/src/Messages/OWSSignalServiceProtos.pb.h
@@ -1,6 +1,4 @@
-//
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
-//
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
 
 #import <ProtocolBuffers/ProtocolBuffers.h>
 
@@ -277,12 +275,15 @@ NSString *NSStringFromOWSSignalServiceProtosGroupContextType(OWSSignalServicePro
 #define Content_syncMessage @"syncMessage"
 #define Content_callMessage @"callMessage"
 #define Content_nullMessage @"nullMessage"
+#define Content_profileKey @"profileKey"
 @interface OWSSignalServiceProtosContent : PBGeneratedMessage<GeneratedMessageProtocol> {
 @private
+  BOOL hasProfileKey_:1;
   BOOL hasDataMessage_:1;
   BOOL hasSyncMessage_:1;
   BOOL hasCallMessage_:1;
   BOOL hasNullMessage_:1;
+  NSString* profileKey;
   OWSSignalServiceProtosDataMessage* dataMessage;
   OWSSignalServiceProtosSyncMessage* syncMessage;
   OWSSignalServiceProtosCallMessage* callMessage;
@@ -292,10 +293,12 @@ NSString *NSStringFromOWSSignalServiceProtosGroupContextType(OWSSignalServicePro
 - (BOOL) hasSyncMessage;
 - (BOOL) hasCallMessage;
 - (BOOL) hasNullMessage;
+- (BOOL) hasProfileKey;
 @property (readonly, strong) OWSSignalServiceProtosDataMessage* dataMessage;
 @property (readonly, strong) OWSSignalServiceProtosSyncMessage* syncMessage;
 @property (readonly, strong) OWSSignalServiceProtosCallMessage* callMessage;
 @property (readonly, strong) OWSSignalServiceProtosNullMessage* nullMessage;
+@property (readonly, strong) NSString* profileKey;
 
 + (instancetype) defaultInstance;
 - (instancetype) defaultInstance;
@@ -359,6 +362,11 @@ NSString *NSStringFromOWSSignalServiceProtosGroupContextType(OWSSignalServicePro
 - (OWSSignalServiceProtosContentBuilder*) setNullMessageBuilder:(OWSSignalServiceProtosNullMessageBuilder*) builderForValue;
 - (OWSSignalServiceProtosContentBuilder*) mergeNullMessage:(OWSSignalServiceProtosNullMessage*) value;
 - (OWSSignalServiceProtosContentBuilder*) clearNullMessage;
+
+- (BOOL) hasProfileKey;
+- (NSString*) profileKey;
+- (OWSSignalServiceProtosContentBuilder*) setProfileKey:(NSString*) value;
+- (OWSSignalServiceProtosContentBuilder*) clearProfileKey;
 @end
 
 #define NullMessage_padding @"padding"
diff --git a/SignalServiceKit/src/Messages/OWSSignalServiceProtos.pb.m b/SignalServiceKit/src/Messages/OWSSignalServiceProtos.pb.m
index e0d67382b..44af13083 100644
--- a/SignalServiceKit/src/Messages/OWSSignalServiceProtos.pb.m
+++ b/SignalServiceKit/src/Messages/OWSSignalServiceProtos.pb.m
@@ -1,6 +1,4 @@
-//
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
-//
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
 
 #import "OWSSignalServiceProtos.pb.h"
 // @@protoc_insertion_point(imports)
@@ -562,6 +560,7 @@ NSString *NSStringFromOWSSignalServiceProtosEnvelopeType(OWSSignalServiceProtosE
 @property (strong) OWSSignalServiceProtosSyncMessage* syncMessage;
 @property (strong) OWSSignalServiceProtosCallMessage* callMessage;
 @property (strong) OWSSignalServiceProtosNullMessage* nullMessage;
+@property (strong) NSString* profileKey;
 @end
 
 @implementation OWSSignalServiceProtosContent
@@ -594,12 +593,20 @@ NSString *NSStringFromOWSSignalServiceProtosEnvelopeType(OWSSignalServiceProtosE
   hasNullMessage_ = !!_value_;
 }
 @synthesize nullMessage;
+- (BOOL) hasProfileKey {
+  return !!hasProfileKey_;
+}
+- (void) setHasProfileKey:(BOOL) _value_ {
+  hasProfileKey_ = !!_value_;
+}
+@synthesize profileKey;
 - (instancetype) init {
   if ((self = [super init])) {
     self.dataMessage = [OWSSignalServiceProtosDataMessage defaultInstance];
     self.syncMessage = [OWSSignalServiceProtosSyncMessage defaultInstance];
     self.callMessage = [OWSSignalServiceProtosCallMessage defaultInstance];
     self.nullMessage = [OWSSignalServiceProtosNullMessage defaultInstance];
+    self.profileKey = @"";
   }
   return self;
 }
@@ -631,6 +638,9 @@ static OWSSignalServiceProtosContent* defaultOWSSignalServiceProtosContentInstan
   if (self.hasNullMessage) {
     [output writeMessage:4 value:self.nullMessage];
   }
+  if (self.hasProfileKey) {
+    [output writeString:5 value:self.profileKey];
+  }
   [self.unknownFields writeToCodedOutputStream:output];
 }
 - (SInt32) serializedSize {
@@ -652,6 +662,9 @@ static OWSSignalServiceProtosContent* defaultOWSSignalServiceProtosContentInstan
   if (self.hasNullMessage) {
     size_ += computeMessageSize(4, self.nullMessage);
   }
+  if (self.hasProfileKey) {
+    size_ += computeStringSize(5, self.profileKey);
+  }
   size_ += self.unknownFields.serializedSize;
   memoizedSerializedSize = size_;
   return size_;
@@ -711,6 +724,9 @@ static OWSSignalServiceProtosContent* defaultOWSSignalServiceProtosContentInstan
                          withIndent:[NSString stringWithFormat:@"%@  ", indent]];
     [output appendFormat:@"%@}\n", indent];
   }
+  if (self.hasProfileKey) {
+    [output appendFormat:@"%@%@: %@\n", indent, @"profileKey", self.profileKey];
+  }
   [self.unknownFields writeDescriptionTo:output withIndent:indent];
 }
 - (void) storeInDictionary:(NSMutableDictionary *)dictionary {
@@ -734,6 +750,9 @@ static OWSSignalServiceProtosContent* defaultOWSSignalServiceProtosContentInstan
    [self.nullMessage storeInDictionary:messageDictionary];
    [dictionary setObject:[NSDictionary dictionaryWithDictionary:messageDictionary] forKey:@"nullMessage"];
   }
+  if (self.hasProfileKey) {
+    [dictionary setObject: self.profileKey forKey: @"profileKey"];
+  }
   [self.unknownFields storeInDictionary:dictionary];
 }
 - (BOOL) isEqual:(id)other {
@@ -753,6 +772,8 @@ static OWSSignalServiceProtosContent* defaultOWSSignalServiceProtosContentInstan
       (!self.hasCallMessage || [self.callMessage isEqual:otherMessage.callMessage]) &&
       self.hasNullMessage == otherMessage.hasNullMessage &&
       (!self.hasNullMessage || [self.nullMessage isEqual:otherMessage.nullMessage]) &&
+      self.hasProfileKey == otherMessage.hasProfileKey &&
+      (!self.hasProfileKey || [self.profileKey isEqual:otherMessage.profileKey]) &&
       (self.unknownFields == otherMessage.unknownFields || (self.unknownFields != nil && [self.unknownFields isEqual:otherMessage.unknownFields]));
 }
 - (NSUInteger) hash {
@@ -769,6 +790,9 @@ static OWSSignalServiceProtosContent* defaultOWSSignalServiceProtosContentInstan
   if (self.hasNullMessage) {
     hashCode = hashCode * 31 + [self.nullMessage hash];
   }
+  if (self.hasProfileKey) {
+    hashCode = hashCode * 31 + [self.profileKey hash];
+  }
   hashCode = hashCode * 31 + [self.unknownFields hash];
   return hashCode;
 }
@@ -824,6 +848,9 @@ static OWSSignalServiceProtosContent* defaultOWSSignalServiceProtosContentInstan
   if (other.hasNullMessage) {
     [self mergeNullMessage:other.nullMessage];
   }
+  if (other.hasProfileKey) {
+    [self setProfileKey:other.profileKey];
+  }
   [self mergeUnknownFields:other.unknownFields];
   return self;
 }
@@ -881,6 +908,10 @@ static OWSSignalServiceProtosContent* defaultOWSSignalServiceProtosContentInstan
         [self setNullMessage:[subBuilder buildPartial]];
         break;
       }
+      case 42: {
+        [self setProfileKey:[input readString]];
+        break;
+      }
     }
   }
 }
@@ -1004,6 +1035,22 @@ static OWSSignalServiceProtosContent* defaultOWSSignalServiceProtosContentInstan
   resultContent.nullMessage = [OWSSignalServiceProtosNullMessage defaultInstance];
   return self;
 }
+- (BOOL) hasProfileKey {
+  return resultContent.hasProfileKey;
+}
+- (NSString*) profileKey {
+  return resultContent.profileKey;
+}
+- (OWSSignalServiceProtosContentBuilder*) setProfileKey:(NSString*) value {
+  resultContent.hasProfileKey = YES;
+  resultContent.profileKey = value;
+  return self;
+}
+- (OWSSignalServiceProtosContentBuilder*) clearProfileKey {
+  resultContent.hasProfileKey = NO;
+  resultContent.profileKey = @"";
+  return self;
+}
 @end
 
 @interface OWSSignalServiceProtosNullMessage ()