FBEncryptor is enabled to encrypt/decrypt a message. Supported encryption algorithm is AES 256 bit only. Additionally BASE64 encode/decode is supported.
(1) Encrypt/decrypt plain text message with Base64 encoding
NSString* encrypted = [FBEncryptorAES encryptBase64String:@"Hello" keyString:@"somekey" separateLines:NO];
The output string is encoded with Base64.
example) message: @"Hello" output : @"gT2IUF9Jzmn7wglXk3XC3w=="
if 'separateLines:' is NO, no CR/LF characters will be added. Otherwise a CR/LF pair will be added every 64 encoded chars.
NSString* decrypted = [FBEncryptorAES decryptBase64String:encrypted keyString:key];
(2) Encrypt/decrypt binary data
NSData* encryptedData = [FBEncryptorAES encryptData:data keyData:key iv:iv]; NSData* decryptedData = [FBEncryptorAES decryptData:encryptData keyData:key iv:iv];
The iv is called 'initailization vector' for CBC mode. it is abled to be set nil.
(3) Generate iv
NSData* iv = [FBEncryptorAES generateIv];
It generates a 16 bytes random binary value. You can use this value for +encryptData:keyData:iv:.
NSData* iv = [FBEncryptorAES generateIv]; NSString* hexString = [FBEncryptorAES hexStringForData:iv]; example: @"b20cd8d972e65762824cc3190040388c" NSData* bin = [FBEncryptorAES dataForHexString:hexString];
- Only support AES256/CBC/PKCS7padding
- Base64 encoding is suported
It is able to change below constants:
FBEncryptor.h #define FBENCRYPT_KEY_SIZE kCCKeySizeAES256
If you want to use AES 128 bit key, you can set the constant like below:
#define FBENCRYPT_KEY_SIZE kCCKeySizeAES128
NOTE: If you change the constant, the testcase will be failed (it is made for AES 256 bit key).
You should copy below files to your projects.
FBEncryptor.h FBEncryptor.m NSData+Base64.h NSData+Base64.m
Special thanks for Matt Gallagher (author of NSData+Base64 code).
"Cocoa with Love: Base64 encoding options on the Mac and iPhone" http://cocoawithlove.com/2009/06/base64-encoding-options-on-mac-and.html
Copyright (c) 2011 Hiroshi Hashiguchi
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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Created by Matt Gallagher on 2009/06/03. Copyright 2009 Matt Gallagher. All rights reserved.
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