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50 lines
1.3 KiB
Objective-C
50 lines
1.3 KiB
Objective-C
//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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#import "NSData+keyVersionByte.h"
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#import "AxolotlExceptions.h"
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#import <SessionProtocolKit/SCKExceptionWrapper.h>
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#import <SessionProtocolKit/OWSAsserts.h>
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@implementation NSData (keyVersionByte)
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const Byte DJB_TYPE = 0x05;
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- (instancetype)prependKeyType {
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if (self.length == 32) {
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NSMutableData *data = [NSMutableData dataWithBytes:&DJB_TYPE length:1];
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[data appendData:self.copy];
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return data;
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} else {
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OWSLogDebug(@"key length: %lu", (unsigned long)self.length);
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}
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return self;
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}
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- (nullable instancetype)removeKeyTypeAndReturnError:(NSError **)outError
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{
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@try {
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return self.throws_removeKeyType;
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} @catch (NSException *exception) {
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*outError = SCKExceptionWrapperErrorMake(exception);
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return nil;
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}
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}
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- (instancetype)throws_removeKeyType
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{
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if (self.length == 33) {
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if ([[self subdataWithRange:NSMakeRange(0, 1)] isEqualToData:[NSData dataWithBytes:&DJB_TYPE length:1]]) {
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return [self subdataWithRange:NSMakeRange(1, 32)];
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} else{
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@throw [NSException exceptionWithName:InvalidKeyException reason:@"Key type is incorrect" userInfo:@{}];
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}
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} else {
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OWSLogDebug(@"key length: %lu", (unsigned long)self.length);
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return self;
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}
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}
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@end
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