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From Les Hazlewood <lhazlew...@apache.org>
Subject Re: Hash API additions supporting Password Hash recalculation
Date Mon, 03 Oct 2011 20:19:15 GMT
Sorry - forgot the link references:

[1] https://issues.apache.org/jira/browse/SHIRO-213
[2] https://issues.apache.org/jira/browse/SHIRO-279
[3] https://issues.apache.org/jira/browse/SHIRO-280
[4] http://en.wikipedia.org/wiki/Crypt_(Unix)

On Mon, Oct 3, 2011 at 8:06 PM, Les Hazlewood <lhazlewood@apache.org> wrote:
> Hi all,
>
> I'm in the process of trying to finish up implementations for
> SHIRO-213 [1], SHIRO-279 [2] and SHIRO-280 [3] (all related to
> password management) in the form of a new PasswordService component.
>
> To convert a password hash into a String that can be used later to
> compare passwords - even if the app's settings for hashes change over
> time - that String needs to be formatted in such a way that the
> original hash settings (salt, #iterations, algorithm name) can be
> discovered and used to hash the provided password.  Typically this is
> handled by the Modular Crypt Format [4] and I've created a
> Shiro-formated String that adheres to the MCF formatting.
>
> To compare passwords later, this process needs to be reversed, i.e.
> formatted String -> hash parameters.  I need a Java class to represent
> the relevant information after reading the String.
>
> Our current Hash interface _could_ solve this need if we added two methods:
>
> ByteSource getSalt();
> int getIterations();
>
> All of our existing Hash implementations already have access to this
> data concepts during the hash - its just that those two fields are not
> retained for later access after the hash operation is performed.  If
> we add those two methods, I can use our existing Hash classes to use
> for the PasswordService's needs (i.e. String --> hash parameters,
> which would be String --> Hash instance).
>
> Does anyone have any objections to or thoughts about these additions?
>
> Les

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