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POAES interoperability between .Net and iPhone?
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  1. POAES interoperability between .Net and iPhone?
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    copied!<p>I need to encrypt a string on the iPhone and send it to a .Net web service for decryption. I am able to encrypt/decrypt on the iPhone and with .Net, but the encrypted strings from the iPhone cannot be decrypted by .Net. The error I get is "Padding is invalid and cannot be removed."</p> <p>The .Net code is from: <a href="http://blog.realcoderscoding.com/index.php/2008/07/dot-net-encryption-simple-aes-wrapper/" rel="noreferrer">http://blog.realcoderscoding.com/index.php/2008/07/dot-net-encryption-simple-aes-wrapper/</a></p> <p>The iPhone code uses the sample code from: <a href="http://nootech.wordpress.com/2009/01/17/symmetric-encryption-with-the-iphone-sdk/" rel="noreferrer">http://nootech.wordpress.com/2009/01/17/symmetric-encryption-with-the-iphone-sdk/</a></p> <p>AFAIK my key settings are the same:</p> <pre><code>result.BlockSize = 128; // iPhone: kCCBlockSizeAES128 result.KeySize = 128; // kCCBlockSizeAES128 result.Mode = CipherMode.CBC; result.Padding = PaddingMode.PKCS7; // kCCOptionPKCS7Padding </code></pre> <p>I tried different ways of generating ciphertext. hello/hello is:</p> <p>e0PnmbTg/3cT3W+92CDw1Q== in .Net </p> <p>yrKe5Z7p7MNqx9+CbBvNqQ== on iPhone</p> <p>and "openssl enc -aes-128-cbc -nosalt -a -in hello.txt -pass pass:hello" generates: QA+Ul+r6Zmr7yHipMcHSbQ==</p> <p>Update: <a href="http://dotmac.rationalmind.net/2009/02/aes-interoperability-between-net-and-iphone/" rel="noreferrer">I've posted the working code for this here</a>.</p>
 

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