AES Rijndael on the PHP and iOS server sometimes generates different ciphers

Question

I use the NSData + AESCrypt category from Jim Dovey and NSString + AESCrypt from Michael Sedlaczek (2011-02-22).

And in PHP, I have a simple script:

<?php
$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
$key = '01234567890123456789012345678901';
$plaintext = "myworda";

$ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $plaintext, MCRYPT_MODE_ECB);
$base64encoded_ciphertext = base64_encode($ciphertext);
echo "ciphertext: ".$base64encoded_ciphertext."<br/>";
?>

In ObjC:

NSString *key = @"01234567890123456789012345678901";
NSString *plaintext = [@"+l56Ia4yyK19D2x2+oCXuw==" AES256DecryptWithKey: key];
NSLog(@"plaintext: %@", plaintext);

I modify the $ plaintext variable in PHP, run the script and copy and paste the output cipher into Objective-c to decrypt it.

AND:

• "myword" gives me "+ l56Ia4yyK19D2x2 + oCXuw ==", and I decrypt and get "myword" on iOS [OK]

• “Good morning” gives me “5UdImsV1pQs60ovXmH74HQ ==”, and I decrypt and get “good morning” on iOS [OK]

• "Schröder" gives me "KqNSCE8nGsYUYVdGZ2tnMw ==" and I decrypt and get "Schröder" on iOS [OK]
• "Schröder" gives me "KqNSCE8nGsYUYVdGZ2tnMw ==" and I decrypt and get "Schröder" on iOS [OK]
• " " "lsa + QF3IHQnAFiOjl2Heyg ==", " " iOS [OK]
• " " "kl/ThEyyyUMmKSqU4/fJSzzJOyvsXrGRt5/zsnqjQww =", iOS [FAIL]

# 5 ? " " Xcode, "kl/ThEyyyUMmKSqU4/fJS90UZoJ73S4gox2uCoWoIL8 =", : kl/ThEyuyUMmKSqU4/fJS == kl/ThEyuyUMmKSqU4/fJS zzJOyvsXrGRt5/zsnqjQww!= 90UZoJ73S4gox2uCoWoIL8 =

, , " " Xcode "hVq1AuR8PAXSOztK26pmMw ==", PHP "5UdImsV1pQs60ovXmH74HQ ==", Xcode " " .

, .

Answer 1

PHP- ECB. , ObjC. , . , ObjC ECB, CBC. , , 16 ( ), . 16 ( ), .

, ObjC - CBC IV. , .

ECB . CBC IV. , PHP- CBC ECB.

Answer 2

, MCRYPT_RIJNDAEL_128, 128 16 . , very very very very long text 16 .

, , ios, . ios, AES256DecryptWithKey, , , 256 .

MCRYPT_RIJNDAEL_256 PHP- ios AES128DecryptWithKey ( , , , ios)