(Objective-C) Encrypt / Decrypt Secure Strings

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).

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

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

// Load the secure string with some text.
CkoSecureString *secStr1 = [[CkoSecureString alloc] init];
BOOL 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!