Objective-C

Blowfish Encryption to Match PHP's Mcrypt Extension

See more Encryption Examples

Demonstrates how to match Blowfish encryption results with PHP's mcrypt extension.

Please refer to this PHP (non-Chilkat) example for PHP Blowfish Encryption. The code here matches the PHP mcrypt results on that web page.

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];

//  Use "blowfish2" to get proper results:
crypt.CryptAlgorithm = @"blowfish2";

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

//  KeyLength (in bits) may be a number between 32 and 448.
//  128-bits is usually sufficient.  The KeyLength must be a 
//  multiple of 8.
crypt.KeyLength = [NSNumber numberWithInt:256];

//  Pad with NULL bytes (PHP pads with NULL bytes)
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";

//  The blowfish algorithm uses a 64-bit block size, 
//  therefore the IV must be 8 bytes:
NSString *ivAscii = @"12345678";
[crypt SetEncodedIV: ivAscii encoding: @"ascii"];

//  For 256-bit encryption, the key is 32 bytes:
NSString *keyAscii = @"1234567890123456ABCDEFGHIJKLMNOP";
[crypt SetEncodedKey: keyAscii encoding: @"ascii"];

NSString *plainText = 0;
plainText = @"The quick brown fox jumped over the lazy dog";

NSString *cipherText = [crypt EncryptStringENC: plainText];
NSLog(@"%@",cipherText);
//  Output should be (case insensitive):
//  276855ca6c0d60f7d9708210440c1072e05d078e733b34b4198d609dc2fcc2f0c30926cdef3b6d52baf6e345aa03f83e

//  Do 128-bit Blowfish encryption:
crypt.KeyLength = [NSNumber numberWithInt:128];
keyAscii = @"1234567890123456";
[crypt SetEncodedKey: keyAscii encoding: @"ascii"];

cipherText = [crypt EncryptStringENC: plainText];
NSLog(@"%@",cipherText);
//  Output should be (case insensitive):
//  d2b5abb73208aea3790621d028afcc74d8dd65fb9ea8e666444a72523f5ecca60df79a424e2c714fa6efbafcc40bdca0