AES128 iphone加密匹配到最后

我试图加密要在服务器之间传输的数据,但是我似乎无法在objective-c中获得正确的输出:(这里的完整代码: http://pastebin.com/zPdHxShu

 // 128-bit key, CBC mode
 // ------------------------
 // IV = '1234567890123456'  
 //  (hex: 31323334353637383930313233343536)
 // Key = '1234567890123456'  
 //  (hex: 31323334353637383930313233343536)
 // PlainText:
 //  'The quick brown fox jumped over the lazy dog'
 // CipherText(hex):
 //  f78176ae 8dfe8457 8529208d 30f446bb b29a64dc 388b5c0b 63140a4f 316b3f34 1fe7d3b1 a3cc5113 c81ef8dd 714a1c99 // correct output
 //  f78176ae 8dfe8457 8529208d 30f446bb b29a64dc 388b5c0b 63140a4f 316b3f34 50f18175 f7a3ad06 2d8033cc d092ca6a // my output
    //                                                                       ^^^ start to get different output here
 //  Note: I get this output in php no problem.