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https://issues.apache.org/jira/browse/KNOX-2527?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sandor Molnar resolved KNOX-2527.
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Resolution: Fixed
> Support HMAC signature/verification in JWT token authority
> ----------------------------------------------------------
>
> Key: KNOX-2527
> URL: https://issues.apache.org/jira/browse/KNOX-2527
> Project: Apache Knox
> Issue Type: New Feature
> Components: KnoxSSO, Server
> Affects Versions: 1.5.0
> Reporter: Sandor Molnar
> Assignee: Sandor Molnar
> Priority: Major
> Fix For: 1.6.0
>
> Time Spent: 1h 50m
> Remaining Estimate: 0h
>
> As of now, in {{DefaultTokenAuthorityService}}, the generated JWT token is
> signed by RSA (PKI). It would be beneficial to add support for HMAC as well
> so that token signature/verification would not require a keystore being set
> but using a secret stored via Knox's alias service. The recommended alias
> name is {{gateway.signing.hmac.secret}}
> To support backward compatibility, the implementation should use HMAC
> signature/verification only if:
> - the HMAC secret is configured via the alias service for the gateway, and
> - there is no previously pre-configured {{gateway.signing.keystore.name}}
> which is a clear indication of end-user preference of using PKI signatures.
> The default HMAC signing algorithm should be {{HS256}} (HMAC using SHA-256
> hash algorithm) and clients should be able to change it by already existing
> request parameters called {{knoxsso.token.sigalg}} or {{knox.token.sigalg}}.
> Other valid values are:
> - {{HS384}} (HMAC using SHA-384 hash algorithm)
> - {{HS512}} (HMAC using SHA-512 hash algorithm)
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