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(Objective-C) Streaming Compression --> Streaming EncryptionDemonstrate how to feed a compression stream into an encryption stream. This example does the following: Data File --> Compress --> Encrypt --> Application Reads
#import <CkoCompression.h> #import <CkoCrypt2.h> #import <NSString.h> #import <CkoStream.h> #import <CkoTask.h> #import <CkoBinData.h> // This requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. BOOL success; // Initialize the compression object. CkoCompression *compress = [[CkoCompression alloc] init]; compress.Algorithm = @"deflate"; // Initialize the encryption object. CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init]; crypt.CryptAlgorithm = @"chacha20"; crypt.KeyLength = [NSNumber numberWithInt:256]; crypt.EncodingMode = @"hex"; NSString *ivHex = @"000000000000000000000002"; [crypt SetEncodedIV: ivHex encoding: @"hex"]; crypt.InitialCount = [NSNumber numberWithInt:42]; NSString *keyHex = @"1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0"; [crypt SetEncodedKey: keyHex encoding: @"hex"]; // Setup the streams. // streamC is for compression CkoStream *streamC = [[CkoStream alloc] init]; // streamE is for encryption CkoStream *streamE = [[CkoStream alloc] init]; // The source for the compressor is a file. streamC.SourceFile = @"qa_data/hamlet.xml"; // The source for the encryptor is the output of the compressor stream. success = [streamE SetSourceStream: streamC]; // Our application will be reading the output of streamE. // Start the compression and encryption streams in background threads.. CkoTask *taskC = [compress CompressStreamAsync: streamC]; CkoTask *taskE = [crypt EncryptStreamAsync: streamE]; success = [taskC Run]; success = [taskE Run]; // Read the compressed and encrypted bytes. CkoBinData *outData = [[CkoBinData alloc] init]; while ((streamE.EndOfStream != YES)) { if (streamE.DataAvailable == YES) { success = [streamE ReadBd: outData]; } } // Let's make sure the background task finished. // It should already be the case that the task is finished. while (((taskE.Finished != YES) || (taskC.Finished != YES))) { [taskE SleepMs: [NSNumber numberWithInt: 20]]; } // Get any remaining data that needs to be flushed. if (streamE.DataAvailable == YES) { success = [streamE ReadBd: outData]; } // Double-check for success.. if (taskE.TaskSuccess != YES) { NSLog(@"%@",@"async encryption failed:"); NSLog(@"%@",taskE.ResultErrorText); success = NO; } // Double-check for success.. if (taskC.TaskSuccess != YES) { NSLog(@"%@",@"async compression failed:"); NSLog(@"%@",taskC.ResultErrorText); success = NO; } // Save the compressed/encrypted data to a file. [outData WriteFile: @"qa_output/compressedEncrypted.dat"]; NSLog(@"%@",@"The async compress/encrypt was successful."); // Let's decrypt and decompress to further verify... success = [crypt DecryptBd: outData]; success = [compress DecompressBd: outData]; // outData should contain the original data.. success = [outData WriteFile: @"qa_output/original_hamlet.xml"]; |
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