[Asterisk-code-review] res_stir_shaken: Add outbound INVITE support. (asterisk[master])

[Benjamin Keith Ford]

Hello Joshua Colp, Friendly Automation, 

I'd like you to reexamine a change. Please visit

    https://gerrit.asterisk.org/c/asterisk/+/14509

to look at the new patch set (#2).

Change subject: res_stir_shaken: Add outbound INVITE support.
......................................................................

res_stir_shaken: Add outbound INVITE support.

Integrated STIR/SHAKEN support with outgoing INVITEs. When an INVITE is
sent, the caller ID will be checked to see if there is a certificate
that corresponds to it. If so, that information will be retrieved and an
Identity header will be added to the SIP message. The format is:

header.payload.signature;info=<public_key_url>alg=ES256;ppt=shaken

Header, payload, and signature are all BASE64 encoded. The public key
URL is retrieved from the certificate. Currently the algorithm and ppt
are ES256 and shaken, respectively. This message is signed and can be
used for verification on the receiving end.

Two new configuration options have been added to the certificate object:
attestation and origid. The attestation is required and must be A, B, or
C. origid is the origination identifier.

A new utility function has been added as well that takes a string,
allocates space, BASE64 encodes it, then returns it, eliminating the
need to calculate the size yourself.

Change-Id: I1f84d6a5839cb2ed152ef4255b380cfc2de662b4
---
M configs/samples/stir_shaken.conf.sample
M include/asterisk/res_stir_shaken.h
M include/asterisk/utils.h
M main/utils.c
M res/res_pjsip_stir_shaken.c
M res/res_stir_shaken.c
M res/res_stir_shaken/certificate.c
M res/res_stir_shaken/certificate.h
8 files changed, 234 insertions(+), 22 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/09/14509/2
-- 
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Gerrit-Project: asterisk
Gerrit-Branch: master
Gerrit-Change-Id: I1f84d6a5839cb2ed152ef4255b380cfc2de662b4
Gerrit-Change-Number: 14509
Gerrit-PatchSet: 2
Gerrit-Owner: Benjamin Keith Ford <bford at digium.com>
Gerrit-Reviewer: Friendly Automation
Gerrit-Reviewer: Joshua Colp <jcolp at sangoma.com>
Gerrit-MessageType: newpatchset
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