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Description of problem:
OpenSSH uses the EVP_Sign* and EVP_Verify* APIs for signature generation and verification. Unfortunately the only FIPS compliant APIs for signature generation and verification are the EVP_DigestSign* and EVP_DigestVerify* APIs.

Version-Release number of selected component (if applicable):
openssh-8.7p1-8.el9

How reproducible:
always

Steps to Reproduce:
1. inspect sources or run with openssl version that disables the non-FIPS compliant APIs

Actual results:
non compliant APIs used

Expected results:
only compliant APIs used

Additional info:

What should be done:
In the function sshkey_calculate_signature/sshkey_verify_signature we should use the DigestSignInit/Update/Final API

ECDSA_do_sign/verify calls should be eliminated from both SSH and ssh_pam (leave just in sk-dummy.c)
It can be done via reconstructing EVP_PKEY object and dealing with it and new API

DH/ECDH key exchanges should be rewritten to use EVP_PKEY API

The keys created via EVP_PKEY_set1_* functions follow the legacy code path. It means we have to recreate non-legacy EVP_PKEY objects from components.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (openssh bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:6622