Objective-C

Twofish Encryption - 128-bit, 192-bit, 256-bit

See more Encryption Examples

Twofish encryption. The Chilkat encryption component supports 128-bit, 192-bit, and 256-bit Twofish encryption in both ECB (Electronic Cookbook) and CBC (Cipher-Block Chaining) modes. Objective-C

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

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

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

//  Set the encryption algorithm = "twofish"	
crypt.CryptAlgorithm = @"twofish";

//  CipherMode may be "ecb" or "cbc"
crypt.CipherMode = @"cbc";

//  KeyLength may be 128, 192, 256
crypt.KeyLength = [NSNumber numberWithInt:256];

//  The padding scheme determines the contents of the bytes
//  that are added to pad the result to a multiple of the
//  encryption algorithm's block size.  Twofish has a block
//  size of 16 bytes, so encrypted output is always
//  a multiple of 16.
crypt.PaddingScheme = [NSNumber numberWithInt:0];

//  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";

//  An initialization vector is required if using CBC mode.
//  ECB mode does not use an IV.
//  The length of the IV is equal to the algorithm's block size.
//  It is NOT equal to the length of the key.
NSString *ivHex = @"000102030405060708090A0B0C0D0E0F";
[crypt SetEncodedIV: ivHex encoding: @"hex"];

//  The secret key must equal the size of the key.  For
//  256-bit encryption, the binary secret key is 32 bytes.
//  For 128-bit encryption, the binary secret key is 16 bytes.
NSString *keyHex = @"000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F";
[crypt SetEncodedKey: keyHex encoding: @"hex"];

//  Encrypt a string...
//  The input string is 44 ANSI characters (i.e. 44 bytes), so
//  the output should be 48 bytes (a multiple of 16).
//  Because the output is a hex string, it should
//  be 96 characters long (2 chars per byte).
NSString *encStr = [crypt EncryptStringENC: @"The quick brown fox jumps over the lazy dog."];
NSLog(@"%@",encStr);

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