diff --git a/SignalServiceKit/src/Profiles/OWSProfilesManager.h b/SignalServiceKit/src/Profiles/OWSProfilesManager.h
index bddbcae48..95c115d5a 100644
--- a/SignalServiceKit/src/Profiles/OWSProfilesManager.h
+++ b/SignalServiceKit/src/Profiles/OWSProfilesManager.h
@@ -13,6 +13,8 @@ extern NSString *const kNSNotificationName_LocalProfileDidChange;
 
 + (instancetype)sharedManager;
 
+#pragma mark - Local Profile
+
 @property (atomic, nullable, readonly) NSString *localProfileName;
 @property (atomic, nullable, readonly) UIImage *localProfileAvatarImage;
 
@@ -26,6 +28,18 @@ extern NSString *const kNSNotificationName_LocalProfileDidChange;
 
 - (void)appLaunchDidBegin;
 
+#pragma mark - Profile Whitelist
+
+- (void)addUserToProfileWhitelist:(NSString *)recipientId;
+
+- (BOOL)isUserInProfileWhitelist:(NSString *)recipientId;
+
+#pragma mark - Known Profile Keys
+
+- (void)setProfileKey:(NSData *)profileKey forRecipientId:(NSString *)recipientId;
+
+- (nullable NSData *)profileKeyForRecipientId:(NSString *)recipientId;
+
 @end
 
 NS_ASSUME_NONNULL_END
diff --git a/SignalServiceKit/src/Profiles/OWSProfilesManager.m b/SignalServiceKit/src/Profiles/OWSProfilesManager.m
index 61b7284e8..5b08e4196 100644
--- a/SignalServiceKit/src/Profiles/OWSProfilesManager.m
+++ b/SignalServiceKit/src/Profiles/OWSProfilesManager.m
@@ -82,6 +82,10 @@ NSString *const kOWSProfilesManager_LocalProfileNameKey = @"kOWSProfilesManager_
 NSString *const kOWSProfilesManager_LocalProfileAvatarMetadataKey
     = @"kOWSProfilesManager_LocalProfileAvatarMetadataKey";
 
+NSString *const kOWSProfilesManager_WhitelistCollection = @"kOWSProfilesManager_WhitelistCollection";
+
+NSString *const kOWSProfilesManager_KnownProfileKeysCollection = @"kOWSProfilesManager_KnownProfileKeysCollection";
+
 // TODO:
 static const NSInteger kProfileKeyLength = 16;
 
@@ -403,6 +407,46 @@ static const NSInteger kProfileKeyLength = 16;
     });
 }
 
+#pragma mark - Profile Whitelist
+
+- (void)addUserToProfileWhitelist:(NSString *)recipientId
+{
+    OWSAssert(recipientId.length > 0);
+
+    [self.dbConnection setObject:@(1) forKey:recipientId inCollection:kOWSProfilesManager_WhitelistCollection];
+}
+
+- (BOOL)isUserInProfileWhitelist:(NSString *)recipientId
+{
+    OWSAssert(recipientId.length > 0);
+
+    return (nil != [self.dbConnection objectForKey:recipientId inCollection:kOWSProfilesManager_WhitelistCollection]);
+}
+
+#pragma mark - Known Profile Keys
+
+- (void)setProfileKey:(NSData *)profileKey forRecipientId:(NSString *)recipientId
+{
+    OWSAssert(profileKey.length == kProfileKeyLength);
+    OWSAssert(recipientId.length > 0);
+
+    [self.dbConnection setObject:profileKey
+                          forKey:recipientId
+                    inCollection:kOWSProfilesManager_KnownProfileKeysCollection];
+}
+
+- (nullable NSData *)profileKeyForRecipientId:(NSString *)recipientId
+{
+    OWSAssert(recipientId.length > 0);
+
+    NSData *_Nullable profileKey =
+        [self.dbConnection objectForKey:recipientId inCollection:kOWSProfilesManager_KnownProfileKeysCollection];
+    if (profileKey) {
+        OWSAssert(profileKey.length == kProfileKeyLength);
+    }
+    return profileKey;
+}
+
 #pragma mark - Avatar Disk Cache
 
 - (nullable UIImage *)loadProfileAvatarWithFilename:(NSString *)fileName