Objective-C

Encrypt / Decrypt a File and Verify it has not Changed

See more Encryption Examples

Demonstrates how to encrypt and decrypt a file, and verify it has not changed. Objective-C

#import <CkoCrypt2.h>
#import <NSString.h>
#import <CkoFileAccess.h>

BOOL success = NO;

//  This requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init];

crypt.CryptAlgorithm = @"aes";
crypt.CipherMode = @"cbc";
crypt.KeyLength = [NSNumber numberWithInt:128];
crypt.PaddingScheme = [NSNumber numberWithInt:0];

NSString *ivHex = @"000102030405060708090A0B0C0D0E0F";
[crypt SetEncodedIV: ivHex encoding: @"hex"];

NSString *keyHex = @"00010203040506071011121314151617";
[crypt SetEncodedKey: keyHex encoding: @"hex"];

NSString *dataFile = @"qa_data/zips/HBIQ040615300005.ZIP";
NSString *outFile = @"qa_output/HBIQ040615300005.enc";
NSString *outFile2 = @"qa_output/HBIQ040615300005.ZIP";

success = [crypt CkEncryptFile: dataFile destFile: outFile];
success = [crypt CkDecryptFile: outFile destFile: outFile2];

CkoFileAccess *fac = [[CkoFileAccess alloc] init];
BOOL bEqual = [fac FileContentsEqual: dataFile path2: outFile2];
if (bEqual != YES) {
    NSLog(@"%@",@"Decrypted file not equal to the original.");
}
else {
    NSLog(@"%@",@"Success.");
}