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POPBKDF2 with bouncycastle in Java
 

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  1. POPBKDF2 with bouncycastle in Java
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    <p>I'm trying to securely store a password in a database and for that I chose to store its hash generated using the PBKDF2 function. I want to do this using the bouncy castle library but I don't know why I cannot get it to work by using the JCE interface... The problem is that generating the hash in 3 different modes: <br> 1. using the PBKDF2WithHmacSHA1 secret key factory provided by sun <br> 2. using the bouncy castle api directly <br> 3. using the bouncy castle through JCE <br> results in 2 distinct values: one common to the first two and one for the third.</p> <p>Here is my code:</p> <pre><code> //Mode 1 SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1"); KeySpec keyspec = new PBEKeySpec("password".toCharArray(), salt, 1000, 128); Key key = factory.generateSecret(keyspec); System.out.println(key.getClass().getName()); System.out.println(Arrays.toString(key.getEncoded())); //Mode 2 PBEParametersGenerator generator = new PKCS5S2ParametersGenerator(); generator.init(PBEParametersGenerator.PKCS5PasswordToUTF8Bytes(("password").toCharArray()), salt, 1000); KeyParameter params = (KeyParameter)generator.generateDerivedParameters(128); System.out.println(Arrays.toString(params.getKey())); //Mode 3 SecretKeyFactory factorybc = SecretKeyFactory.getInstance("PBEWITHHMACSHA1", "BC"); KeySpec keyspecbc = new PBEKeySpec("password".toCharArray(), salt, 1000, 128); Key keybc = factorybc.generateSecret(keyspecbc); System.out.println(keybc.getClass().getName()); System.out.println(Arrays.toString(keybc.getEncoded())); System.out.println(keybc.getAlgorithm()); </code></pre> <p>I know that PBKDF2 is implemented using HMAC SHA1 so that is why i chose as algorithm in the last method the "PBEWITHHMACSHA1" which i took from the bouncy castle java docs.</p> <p>The output is the following:</p> <pre><code>com.sun.crypto.provider.SunJCE_ae [-53, 29, 113, -110, -25, 76, 115, -127, -64, 74, -63, 102, 75, 81, -21, 74] [-53, 29, 113, -110, -25, 76, 115, -127, -64, 74, -63, 102, 75, 81, -21, 74] org.bouncycastle.jce.provider.JCEPBEKey [14, -47, -87, -16, -117, -31, 91, -121, 90, -68, -82, -31, -27, 5, -93, -67, 30, -34, -64, -40] PBEwithHmacSHA </code></pre> <p>Any ideas?</p>
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    1. COI'm not sure what "Mode 3" is doing, but I'd disregard it. It's output is 160 bits, not 128, like you requested. 160 bits is the size of a SHA-1 hash. For portability, I'd stick with "Mode 1."
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    2. COI agree with erickson - is there a real need for you to use "Mode 3" or would "Mode 1" be acceptable for securely storing the password? Good detailed question for your first question here by the way.
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    3. COThere is no need indeed. I am just trying to understand why the PBEWITHHMACSHA1 from BouncyCastle doesn't do the same thing. And I agree, I wouldn't choose the second method because of portability issues.
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