[gnutls-devel] GnuTLS | Enable RIPEMD160 and PBES1-DES-SHA1 for compatibility (!1824)

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Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1824

Project:Branches: dueno/gnutls:wip/dueno/legacy-algorithms to gnutls/gnutls:master
Author:   Daiki Ueno




<!-- Add a description of the new feature/bug fix. Reference any relevant bugs. -->

This adds support for RIPEMD160 and PBES1-DES-SHA1 for backward compatibility with GCR, where we try to [support](https://gitlab.gnome.org/GNOME/gcr/-/merge_requests/140) GnuTLS as an alternative crypto backend.

* x509: support PBES1-DES-SHA1

PBES1 with single DES backed by SHA-1 hash is used to parse legacy
PKCS#8 file in GCR.

Signed-off-by: Daiki Ueno <ueno at gnu.org>

* nettle: plumb RIPEMD160

RIPEMD160 is used by GCR to calculate fingerprint for an OpenPGP key
when displaying it:
https://gitlab.gnome.org/GNOME/gcr/-/blob/f3c95db45099dff288986aa367007da1e855a3d0/gcr/gcr-openpgp.c#L268

Signed-off-by: Daiki Ueno <ueno at gnu.org>

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [ ] Code modified for feature
 * [ ] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [ ] Documentation updated / NEWS entry present (for non-trivial changes)
 * [ ] CI timeout is 2h or higher (see Settings/CICD/General pipelines/Timeout)

## Reviewer's checklist:
 * [ ] Any issues marked for closing are addressed
 * [ ] There is a test suite reasonably covering new functionality or modifications
 * [ ] Function naming, parameters, return values, types, etc., are consistent and according to `CONTRIBUTION.md`
 * [ ] This feature/change has adequate documentation added
 * [ ] No obvious mistakes in the code

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