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FclBlowfish

An Objective-C Blowfish Implementation

  • Supports EBC and CBC mode
  • Supports padding RFC and Zero padding
  • Works compatible with PHP's Mcrypt
  • Originally coded for iOS SDK. It may work also for OS X SDK

You easily find out how to use the library.

  • Import it.
  • Create an instance.
  • Set IV and Key then call prepare
  • Do encryption or decryption

Feel free to contribute

How to Use

Encrypt

FclBlowfish *bf = [[FclBlowfish alloc] init];
bf.Key = @"37501370571307510";
bf.IV = @"asdf";
[bf prepare];
NSLog(@"encrypt %@", [bf encrypt:@"Hi there" withMode:modeCBC withPadding:paddingRFC]);

Decrypt

bf = [[FclBlowfish alloc] init];
bf.Key = @"37501370571307510";
bf.IV = @"asdf";
[bf prepare];    NSLog(@"encrypt %@", [bf decrypt:[bf encrypt:@"Hi there" withMode:modeCBC withPadding:paddingRFC] withMode:modeCBC withPadding:paddingRFC]);

Properties

Property Description Restrictions Suggestions
Key This is the cryption key use it as salt Must use 1 byte characters(ASCII table) You can use md5 hashed text in hexadecimal format it will be 256 bit size then you can add extra 24 characters(192 bit) to reach 448 bit
IV This is the initialization vector No restricton You need to implement an algrotihm for storing this in final crypted text. Simply you can add base64 encoded iv to end of crypted text. So your server(decryptor) can extract it from the text and use it for decryption. You must do this in order to use unique IV for all crypted text. This way no one can crack it even they know the key you used

Troubleshooting

  • If you use mcrypt_create_iv to generate iv string you may have problems decrypting in ios. Take a look at this issue : #1

To-Do(s)

Developed By

License

Copyright 2013 Can Tecim

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.