(Objective-C) 2-Key Triple DES (112 bits)

Demonstrates 2-Key Triple DES encryption (112-bit 3DES encryption).

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

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

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

// Specify 3DES for the encryption algorithm:
crypt.CryptAlgorithm = @"3des";

crypt.CipherMode = @"ecb";

// For 2-Key Triple-DES, use a key length of 128
// (Given that each byte's msb is a parity bit, the strength is really 112 bits).
crypt.KeyLength = [NSNumber numberWithInt:128];

// Pad with zeros
crypt.PaddingScheme = [NSNumber numberWithInt:3];

// EncodingMode specifies the encoding of the output for
// encryption, and the input for decryption.
// It may be "hex", "url", "base64", or "quoted-printable".
crypt.EncodingMode = @"hex";

// Let's create a secret key by using the MD5 hash of a password.
// The Digest-MD5 algorithm produces a 16-byte hash (i.e. 128 bits)
crypt.HashAlgorithm = @"md5";
NSString *keyHex = [crypt HashStringENC: @"secretPassword"];

// Set the encryption key:
[crypt SetEncodedKey: keyHex encoding: @"hex"];

// Encrypt
NSString *encStr = [crypt EncryptStringENC: @"The quick brown fox jumped over the lazy dog"];
NSLog(@"%@",encStr);

// Now decrypt:
NSString *decStr = [crypt DecryptStringENC: encStr];
NSLog(@"%@",decStr);