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https://issues.apache.org/jira/browse/OLTU-131?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Antonio Sanso closed OLTU-131.
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> Signature parsing from access token is broken for character encodings that
> are not single-byte
> ----------------------------------------------------------------------------------------------
>
> Key: OLTU-131
> URL: https://issues.apache.org/jira/browse/OLTU-131
> Project: Apache Oltu
> Issue Type: Bug
> Components: jose-jws, oauth2-jwt
> Affects Versions: oauth2-1.0.0
> Reporter: Andrei Dulvac
> Assignee: Antonio Sanso
> Priority: Critical
> Labels: PatchAvailable
> Fix For: oauth2-1.0.0
>
> Attachments: signature_utf8.patch
>
>
> If you use the oltu JWSReader with a character encoding that is not
> single-byte, like UTF-8, the signature is parsed incorrectly.
> This is because the signature, according to the JWT spec, is a base64url
> encoded byte array (any byte, generated by HMAC256), which is now decoded
> directly into a String. If the character encoding is set to UTF-8
> (-Dfile.encoding=UTF-8), the decoded signature will be a different byte
> array, usually longer. If the character encoding used is something
> single-byte, like MacRoman, this happens to work.
> From the JWS spec:
> {quote}
> Create the desired serialized output. The JWS Compact Serialization of this
> result is BASE64URL(UTF8(JWS Protected Header)) || '.' || BASE64URL(JWS
> Payload) || '.' || BASE64URL(JWS Signature).
> {quote}
> The solution is to change the JWS reader to store the signature as base64url
> and compare that.
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