Objective-C

Encrypt / Decrypt Secure Strings

See more Encryption Examples

Demonstrates how to use the EncryptSecureENC and DecryptSecureENC methods to encrypt/decrypt secure strings. These methods were added in Chilkat v9.5.0.71 (released January 2018). Objective-C

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

BOOL success = NO;

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

//  Load the secure string with some text.
CkoSecureString *secStr1 = [[CkoSecureString alloc] init];
success = [secStr1 LoadFile: @"qa_data/txt/helloWorld.txt" charset: @"utf-8"];
if (success != YES) {
    NSLog(@"%@",@"Failed to load helloWorld.txt");
    return;
}

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

crypt.CryptAlgorithm = @"aes";
crypt.CipherMode = @"cbc";
crypt.KeyLength = [NSNumber numberWithInt:128];
[crypt SetEncodedKey: @"000102030405060708090A0B0C0D0E0F" encoding: @"hex"];
[crypt SetEncodedIV: @"000102030405060708090A0B0C0D0E0F" encoding: @"hex"];
crypt.EncodingMode = @"base64";

//  Return the base64 encoded encrypted contents of secStr1.
NSString *encryptedStr = [crypt EncryptSecureENC: secStr1];
NSLog(@"%@%@",@"Encrypted string: ",encryptedStr);

//  Output:
//  Encrypted string: qiq+IFhcjTkEIkZyf31V/g==

//  Decrypt to secStr2:
CkoSecureString *secStr2 = [[CkoSecureString alloc] init];
[crypt DecryptSecureENC: encryptedStr secureStr: secStr2];

//  Access the contents of secStr2
NSLog(@"%@%@",@"Decrypted string: ",[secStr2 Access]);

//  Output:
//  Decrypted string: Hello World!