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POHow to generate the same AES key in Java(Android) as in .Net?
 

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  1. POHow to generate the same AES key in Java(Android) as in .Net?
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    <p>I need to generate an AES key in Java (Android) from salt and password given from .Net WebService. I need to have the same key as the key generated in .net with the same password and salt (using Rfc2898DeriveBytes and AesManaged()). Here is my code in Android:</p> <pre><code>char[] passwordAsCharArray = password.toCharArray(); PBEKeySpec pbeKeySpec = new PBEKeySpec(passwordAsCharArray, salt, 1000, 256); SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1"); SecretKeySpec secretKey = new SecretKeySpec(factory.generateSecret(spec).getEncoded(), "AES"); </code></pre> <p>Here is code in .net:</p> <pre><code>byte[] keyBytes = Encoding.Unicode.GetBytes(key); Rfc2898DeriveBytes derivedKey = new Rfc2898DeriveBytes(key, keyBytes); AesManaged rijndaelCSP = new AesManaged(); rijndaelCSP.BlockSize = 128; rijndaelCSP.KeySize = 256; rijndaelCSP.Key = derivedKey.GetBytes(rijndaelCSP.KeySize / 8); rijndaelCSP.IV = derivedKey.GetBytes(rijndaelCSP.BlockSize / 8); ICryptoTransform decryptor = rijndaelCSP.CreateDecryptor(); </code></pre> <p>When I compare both keys they are different. Any ideas how to generate on Android the same key as in .Net? (I know that the key which have been generated in .net is correct). Number of iterations in .Net is 1000, salt and password are also the same as in Android.</p> <hr> <p>Ok, it turned out that I dont need exactly the same key (as a byte array). I needed this to decrypt a file (in Java) which have been encrypted in .Net - with this key it gaves me Bad Padding Exception so I think the key was different and that causes the problem, but all I needed to do was to generate IV like a key - that solved my problem. Thanks for response!</p>
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      1. POHow to generate the same AES key in Java(Android) as in .Net?
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    1. COJust a question: You are passing (String, byte[]) to the `Rfc2898DeriveBytes` constructor, but I couldn't find anywhere in [the docs](http://msdn.microsoft.com/en-us/library/zhe81fz4.aspx) what the # of iterations is. Are you sure 1000 is the default value?
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      1. POHow to generate the same AES key in Java(Android) as in .Net?
      1. USMister Smith
    2. COYes, I've checked it by: derivedKey.IterationsCount - value is 1000
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      1. POHow to generate the same AES key in Java(Android) as in .Net?
      1. USNat
    3. COCould you show us the output of both code snippets in hexadecimals so we can make sure it is not an output encoding error? I don't think you need to wrap the output of `SecretKeyFactory.generateSecret()` into a `SecretKeySpec`.
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      1. POHow to generate the same AES key in Java(Android) as in .Net?
      1. USMaarten Bodewes
 

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