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POUse AES to encrypt with Objective-C and decrypt with PHP
 

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  1. POUse AES to encrypt with Objective-C and decrypt with PHP
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    <p>I want to use AES to encrypt a password in Objective-C, and then decrypt it in PHP, but I have two problems.</p> <ol> <li>I encrypt the password, but it's an <code>NSData</code> object, so I encode it with base64, but when I decode in PHP, the result is <code>nil</code>. So I can't decrypt it.</li> <li>I can encrypt and decrypt the password in Objective-C, so it is the PHP that is the problem, but when I encrypt with AES and then encode with base64, the results are not the same.</li> </ol> <p>Here is my code:</p> <p>PHP:</p> <pre><code> $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB); $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND); $key = "a16byteslongkey!"; $plaintext = "iphone"; $ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $plaintext, MCRYPT_MODE_ECB, $iv); $ciphertext = base64_encode($ciphertext); echo "ciphertext: ".$ciphertext."&lt;br/&gt;"; $ciphertext = base64_decode($ciphertext); $plaintext = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $ciphertext, MCRYPT_MODE_ECB, $iv); echo "plaintext: ".$plaintext."&lt;br/&gt;"; </code></pre> <p>output:</p> <pre><code> ciphertext: SXNepKfh0IrlDDdkq4EdmQ== plaintext: iphone </code></pre> <p>Objective-C: (Get the full source code here: <a href="https://gist.github.com/838614" rel="nofollow">https://gist.github.com/838614</a>)</p> <pre><code> NSString *key = @"a16byteslongkey!"; NSString *plaintext = @"iphone"; NSString *ciphertext = [plaintext AES256EncryptWithKey: key]; NSLog(@"ciphertext: %@", ciphertext); plaintext = [ciphertext AES256DecryptWithKey: key]; NSLog(@"plaintext: %@", plaintext); </code></pre> <p>output:</p> <pre><code> ciphertext: D19l3gsgXJlrLl7B2oCT6g== plaintext: iphone </code></pre> <p>i replace kCCKeySizeAES256 with kCCKeySizeAES128, and replace "kCCOptionPKCS7Padding" with "kCCOptionPKCS7Padding | kCCOptionECBMode",</p>
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    1. CORight off the bat it looks like you're using 128 in PHP and 256 in Obj-C... That'll be a problem.
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      1. USCorey Ogburn
    2. COthanks for you reply, i replace kCCKeySizeAES256 with kCCKeySizeAES128, and replace "kCCOptionPKCS7Padding" with "kCCOptionPKCS7Padding & kCCOptionECBMode", but the results are also not the same. is there any detail i should change?
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      1. USpcrazyc
    3. COyou seem to be `base64_encode`-ing the resulting string in PHP but only converting it to UTF8 in Obj-C. Obviously, the results will be different.
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      1. USAleks G
 

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