[openssl/openssl] 143d7d: Fix EC_KEY_set_private_key() priv_key regression

[Roberto Hueso]

  Branch: refs/heads/OpenSSL_1_1_1-stable
  Home:   https://github.com/openssl/openssl
  Commit: 143d7d4c791df8b9051356be51d9f77bc241fe4c
      https://github.com/openssl/openssl/commit/143d7d4c791df8b9051356be51d9f77bc241fe4c
  Author: Roberto Hueso Gomez <roberto at robertohueso.org>
  Date:   2022-08-04 (Thu, 04 Aug 2022)

  Changed paths:
    M crypto/ec/ec_key.c

  Log Message:
  -----------
  Fix EC_KEY_set_private_key() priv_key regression

This allows to set EC_KEY's private key to NULL and fixes regression
issue following OTC guideline in
https://github.com/openssl/openssl/issues/18744#issuecomment-1195175696

Fixes #18744.

Reviewed-by: Nicola Tuveri <nic.tuv at gmail.com>
Reviewed-by: Matt Caswell <matt at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18874)


  Commit: 1c2f52bed3ebee6222cf078278074c72717df4ec
      https://github.com/openssl/openssl/commit/1c2f52bed3ebee6222cf078278074c72717df4ec
  Author: Roberto Hueso Gomez <roberto at robertohueso.org>
  Date:   2022-08-04 (Thu, 04 Aug 2022)

  Changed paths:
    M test/ec_internal_test.c

  Log Message:
  -----------
  Add test for EC_KEY_set_private_key()

This tests the behavior and API of the EC_KEY_set_private_key function.
It tests compliance with legacy features related to NULL private keys
too.

Reviewed-by: Nicola Tuveri <nic.tuv at gmail.com>
Reviewed-by: Matt Caswell <matt at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18874)


  Commit: 4648839300475055e3d3ec6859704e80785402e2
      https://github.com/openssl/openssl/commit/4648839300475055e3d3ec6859704e80785402e2
  Author: Roberto Hueso Gomez <roberto at robertohueso.org>
  Date:   2022-08-04 (Thu, 04 Aug 2022)

  Changed paths:
    M doc/man3/EC_KEY_new.pod

  Log Message:
  -----------
  Fix EC_KEY_set_private_key() NULL priv_key docs

Updates the docs to describe EC_KEY_set_private_key() function behavior
when a NULL priv_key argument is passed.

Reviewed-by: Nicola Tuveri <nic.tuv at gmail.com>
Reviewed-by: Matt Caswell <matt at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18874)


Compare: https://github.com/openssl/openssl/compare/0b755cdfb52f...464883930047