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https://issues.apache.org/jira/browse/DIRKRB-188?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kai Zheng resolved DIRKRB-188.
------------------------------
Resolution: Fixed
commit 8ba79b284efaeda1f2d2462c49fead83226e1dc8
Author: Drankye <[email protected]>
Date: Mon May 4 21:42:52 2015 +0800
DIRKRB-188 Calculating FAST armor key. Contributed by Yaning
> Calculating FAST armor key
> --------------------------
>
> Key: DIRKRB-188
> URL: https://issues.apache.org/jira/browse/DIRKRB-188
> Project: Directory Kerberos
> Issue Type: New Feature
> Reporter: Kai Zheng
> Assignee: Kai Zheng
> Attachments: DIRKRB-188-v1.patch, DIRKRB-188-v2.patch,
> DIRKRB-188-v3.patch
>
>
> According to the FAST spec, in section of
> https://tools.ietf.org/html/rfc6113#page-17, we need to implement the
> facility for calculating armor key given key1, key2, pepper1, and pepper2, as
> defined as follows.
> {noformat}
> KRB-FX-CF2() combines two protocol keys based on the pseudo-random()
> function defined in [RFC3961].
> Given two input keys, K1 and K2, where K1 and K2 can be of two
> different enctypes, the output key of KRB-FX-CF2(), K3, is derived as
> follows:
> KRB-FX-CF2(protocol key, protocol key, octet string,
> octet string) -> (protocol key)
> PRF+(K1, pepper1) -> octet-string-1
> PRF+(K2, pepper2) -> octet-string-2
> KRB-FX-CF2(K1, K2, pepper1, pepper2) :=
> random-to-key(octet-string-1 ^ octet-string-2)
> Where ^ denotes the exclusive-OR operation. PRF+() is defined as
> follows:
> PRF+(protocol key, octet string) -> (octet string)
> PRF+(key, shared-info) := pseudo-random( key, 1 || shared-info ) ||
> pseudo-random( key, 2 || shared-info ) ||
> pseudo-random( key, 3 || shared-info ) || ...
> {noformat}
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