[OpenSIPS-Users] Stir_shaken signature length

Vlad Patrascu vladp at opensips.org
Tue Apr 14 20:26:57 EST 2020


Hi,

Please check the fix on the latest master branch on github and let me 
know if everything is ok.

Regards,

Vlad Patrascu

On 10.04.2020 12:28, Alexandru Tripon wrote:
> Hi,
>
> I tried to populate the Identity header with the stir_shaken module.
> The header is populated but when I try to verify the signature using 
> an external tool it fails because of the length.
> I have the folowing Identity generated by Opensips:
> `
> eyJhbGciOiJFUzI1NiIsInBwdCI6InNoYWtlbiIsInR5cCI6InBhc3Nwb3J0IiwieDV1IjoiL2hvbWUvdHJpYWwvTHVjcnUvQ29kZS9zdGlyU2hha2VuL215cHVia2V5LnBlbSJ9.eyJhdHRlc3QiOiJBIiwiZGVzdCI6eyJ0biI6WyIxMDAyIl19LCJpYXQiOjE1ODY1MDMxODcsIm9yaWciOnsidG4iOiIxMDAxIn0sIm9yaWdpZCI6IjEyMzQ1NiJ9.MEYCIQCjIx6w8IeilqHq0jbc6uwIB9v1RDmecoep0gRJJC4EmQIhANH1MO9jwRtqH6jgFH12XqROFv-nUroEgzsRAaMJtAsR;info=\u003c/home/trial/Lucru/Code/stirShaken/mypubkey.pem\u003e;ppt=\"shaken\"
> `
> the lenght of encoded signature(in base64) is 96 and in the decoded 
> one is 72.
> In the RFC for ES256 
> algorithm(https://tools.ietf.org/html/rfc7518#section-3.4) the length 
> of the decoded signature is 64.
> Am I missing something here?
>
> Thanks,
> Alexandru Tripon
>
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