[OpenSIPS-Users] Stir_shaken signature length

Alexandru Tripon alexandru.tripon at itsyscom.com
Fri Apr 10 09:28:57 EST 2020


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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