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POPBKDF2 in Java with Bouncy Castle vs .NET Rfc2898DeriveBytes?
 

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  1. POPBKDF2 in Java with Bouncy Castle vs .NET Rfc2898DeriveBytes?
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    <p>I have some C# code that generates a key using PBKDF2.</p> <pre><code>//byte[] salt = new RNGCryptoServiceProvider().GetBytes(salt); byte[] salt = new byte[] { 19, 3, 248, 189, 144, 42, 57, 23 }; // for testing byte[] bcKey = new Rfc2898DeriveBytes("mypassword", salt, 8192).GetBytes(32); </code></pre> <p>This works fine. I am trying to implement the same in Java with Bouncy Castle. Can't get it to work (the fact that Java lacks unsigned types makes it further annoying).</p> <pre><code>SecureRandom random = new SecureRandom(); byte[] salt = u2s(new int[] { 19, 3, 248, 189, 144, 42, 57, 23 }); //random.nextBytes(salt); PBEParametersGenerator generator = new PKCS5S2ParametersGenerator(); generator.init(PBEParametersGenerator.PKCS5PasswordToUTF8Bytes(("BLK" + password).toCharArray()), salt, keyTransformationRounds); KeyParameter params = (KeyParameter)generator.generateDerivedParameters(keyLengthBits); byte[] bcKey = params.getKey(); int[] bcKeyU = s2u(bcKey); System.out.println(new String(Base64.encode(bcKey), "UTF-8")); // Helper functions because Java has no unsigned types // // EDIT: THESE FUNCTIONS ARE INCORRECT. // See my answer below for the correct versions. // static byte[] u2s(int[] unsignedArray) throws IOException { byte[] signedArray = new byte[unsignedArray.length]; for (int i = 0; i &lt; signedArray.length; i++) { if (unsignedArray[i] &lt; 0 || unsignedArray[i] &gt; 255) { throw new IOException("unsignedArray at " + i + " was not within the range 0 to 255."); } signedArray[i] = (byte)(unsignedArray[i] - 128); } return signedArray; } static int[] s2u(byte[] signedArray) { int[] unsignedArray = new int[signedArray.length]; for (int i = 0; i &lt; unsignedArray.length; i++) { unsignedArray[i] = (int)(signedArray[i] + 128); } return unsignedArray; } </code></pre> <p>The resultant bcKey byte arrays differ. What am I doing wrong? Am I going about handling the conversion from unsigned to signed properly or will that not work as I expect?</p>
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