如何使用Objective-C在iOS上进行相同的加密/解密PHP功能？ [英] How can I do this same encrypt/decrypt PHP function on iOS with Objective-C?

问题描述

 函数encrypt_decrypt（$ action，$ string）
 {
 $ output = false; 
 $ key ='mykeyhereblah'; 
 $ iv = md5（md5（$ key））; 
 if（$ action =='encrypt'）{
 $ output = mcrypt_encrypt（MCRYPT_RIJNDAEL_256，md5（$ key），$ string，MCRYPT_MODE_CBC，$ iv）; 
 $ output = base64_encode（$ output）; 
} 
 else if（$ action =='decrypt'）{
 $ output = mcrypt_decrypt（MCRYPT_RIJNDAEL_256，md5（$ key），base64_decode（$ string），MCRYPT_MODE_CBC，$ iv） 
 $ output = rtrim（$ output，）; 
} 
 return $ output; 
} 
  

我的电话是这样的：

  echo encrypt_decrypt（'decrypt'，'2Fa9cICuUFa / UnmAAa5FjXZK4ht9q3cN2qgk1pCvDSs ='）; 
  

如何在iOS上使用Objective-C作为一个的NSString ？它需要与这个PHP函数兼容。

解决方案

所以你想使用CBC模式的AES256进行加密。
您正在寻找的库是CommonCrypto，您可以在这里找到一篇很好的文章： http：// robnapier.net/aes-commoncrypto 。

您还需要一个MD5功能，您可以在这里找到： http://www.makebetterthings.com/iphone/how- to-get-md5-and-sha1-in-objective-c-ios-sdk /

你的代码应该是这样的：

  NSString * originalString，* keyString; 
 NSData * key = [[self md5：keyString] dataUsingEncoding：NSUTF8StringEncoding]; 
 NSData * iv = [[self md5：[self md5：key]] dataUsingEncoding：NSUTF8StringEncoding]; 
 NSData * data = [originalString dataUsingEncoding：NSUTF8StringEncoding]; 
 NSMutableData * cipherData = [NSMutableData dataWithLength：data.length + kCCBlockSizeAES128]; // MCRYPT_RIJNDAEL_256的块大小就像AES128 
 size_t outLength; 
 
 CCCryptorStatus结果
 = CCCrypt（kCCEncrypt，//操作，用kCCDecrypt替换解密
 kCCAlgorithmAES，//与MCRYPT_RIJNDAEL_256相同
无，// CBC模式
 key.bytes，// key 
 32，//因为你使用AES256 
 iv.bytes，// iv 
 data.bytes，// dataIn 
 data .length，// dataInLength，
 cipherData.mutableBytes，// dataOut 
 cipherData.length，// dataOutAvailable 
& outLength）; // dataOutMoved 
 NSString resultString = [cipherData base64Encoding]; 
  

并确保您在这两种情况下使用相同的UTF8编码，并使用此导入： p>

  #import< CommonCrypto / CommonCryptor.h> 
  

我很确定这应该可以工作。

编辑：密钥长度应为32，因为您使用AES256 256bit = 32bytes。默认情况下，MD5的输出不符合此长度。

I have a function in PHP that encrypts and decrypts strings:

function encrypt_decrypt($action, $string) 
{
   $output = false;
   $key = 'mykeyhereblah';
   $iv = md5(md5($key));
   if( $action == 'encrypt' ) {
       $output = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key), $string, MCRYPT_MODE_CBC, $iv);
       $output = base64_encode($output);
   }
   else if( $action == 'decrypt' ){
       $output = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5($key), base64_decode($string), MCRYPT_MODE_CBC, $iv);
       $output = rtrim($output, "");
   }
   return $output;
}

and I call it like this:

echo encrypt_decrypt('decrypt', '2Fa9cICuUFa/UnmAAa5FjXZK4ht9q3cN2qgk1pCvDSs=');

How can I do this exact same thing on iOS with Objective-C for an NSString? It needs to be compatible with this PHP function.

解决方案

So you want to encrypt using AES256 in CBC mode. The library you are looking for is CommonCrypto and you can find a good article about it here:http://robnapier.net/aes-commoncrypto.

You will also need an MD5 function that you can find here: http://www.makebetterthings.com/iphone/how-to-get-md5-and-sha1-in-objective-c-ios-sdk/

Your code should look something like this:

NSString *originalString,*keyString;
NSData *key = [[self md5:keyString] dataUsingEncoding:NSUTF8StringEncoding];
NSData *iv = [[self md5:[self md5:key]] dataUsingEncoding:NSUTF8StringEncoding];
NSData *data = [originalString dataUsingEncoding:NSUTF8StringEncoding];
NSMutableData *cipherData = [NSMutableData dataWithLength:data.length + kCCBlockSizeAES128]; //The block size of MCRYPT_RIJNDAEL_256 is just like AES128
size_t outLength;

CCCryptorStatus result
       = CCCrypt(kCCEncrypt, // operation, replace with kCCDecrypt to decrypt
                 kCCAlgorithmAES, // Same as MCRYPT_RIJNDAEL_256
                 nil, // CBC mode
                 key.bytes, // key
                 32, // Since you are using AES256
                 iv.bytes,// iv
                 data.bytes, // dataIn
                 data.length, // dataInLength,
                 cipherData.mutableBytes, // dataOut
                 cipherData.length, // dataOutAvailable
                 &outLength); // dataOutMoved
NSString resultString = [cipherData base64Encoding];

And make sure you are using the same UTF8 encoding in both cases, and use this import:

#import <CommonCrypto/CommonCryptor.h>

I am pretty sure this should work.

EDIT: the key length should be 32 since you are using AES256 256bit=32bytes. The MD5 output wouldn't match this length by default I think.

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