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76 lines
2.5 KiB
Objective-C
76 lines
2.5 KiB
Objective-C
//
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// Copyright (c) 2017 Open Whisper Systems. All rights reserved.
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//
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#import "OWSOutgoingNullMessage.h"
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#import "Cryptography.h"
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#import "NSDate+OWS.h"
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#import "OWSSignalServiceProtos.pb.h"
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#import "OWSVerificationStateSyncMessage.h"
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#import "TSContactThread.h"
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NS_ASSUME_NONNULL_BEGIN
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@interface OWSOutgoingNullMessage ()
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@property (nonatomic, readonly) OWSVerificationStateSyncMessage *verificationStateSyncMessage;
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@end
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@implementation OWSOutgoingNullMessage
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- (instancetype)initWithContactThread:(TSContactThread *)contactThread
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verificationStateSyncMessage:(OWSVerificationStateSyncMessage *)verificationStateSyncMessage
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{
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self = [super initWithTimestamp:[NSDate ows_millisecondTimeStamp]
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inThread:contactThread];
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if (!self) {
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return self;
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}
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_verificationStateSyncMessage = verificationStateSyncMessage;
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return self;
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}
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#pragma mark - override TSOutgoingMessage
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- (NSData *)buildPlainTextData:(SignalRecipient *)recipient
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{
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OWSSignalServiceProtosContentBuilder *contentBuilder = [OWSSignalServiceProtosContentBuilder new];
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OWSSignalServiceProtosNullMessageBuilder *nullMessageBuilder = [OWSSignalServiceProtosNullMessageBuilder new];
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NSUInteger contentLength = self.verificationStateSyncMessage.unpaddedVerifiedLength;
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OWSAssert(self.verificationStateSyncMessage.paddingBytesLength > 0);
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// We add the same amount of padding in the VerificationStateSync message and it's coresponding NullMessage so that
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// the sync message is indistinguishable from an outgoing Sent transcript corresponding to the NullMessage. We pad
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// the NullMessage so as to obscure it's content. The sync message (like all sync messages) will be *additionally*
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// padded by the superclass while being sent. The end result is we send a NullMessage of a non-distinct size, and a
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// verification sync which is ~1-512 bytes larger then that.
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contentLength += self.verificationStateSyncMessage.paddingBytesLength;
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OWSAssert(contentLength > 0)
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nullMessageBuilder.padding = [Cryptography generateRandomBytes:contentLength];
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contentBuilder.nullMessage = [nullMessageBuilder build];
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return [contentBuilder build].data;
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}
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- (BOOL)shouldSyncTranscript
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{
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return NO;
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}
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- (void)saveWithTransaction:(YapDatabaseReadWriteTransaction *)transaction
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{
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// No-op as we don't want to actually display this as an outgoing message in our thread.
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return;
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}
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@end
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NS_ASSUME_NONNULL_END
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