[openssl/openssl] 162493: Add sensitive memory clean in priv encode

[pauli]

  Branch: refs/heads/master
  Home:   https://github.openssl.org/openssl/openssl
  Commit: 16249341bb64329c2542c3d1e23b97ed3c44fad3
      https://github.openssl.org/openssl/openssl/commit/16249341bb64329c2542c3d1e23b97ed3c44fad3
  Author: Kan <chenxinpingc2306 at 163.com>
  Date:   2022-06-16 (Thu, 16 Jun 2022)

  Changed paths:
    M crypto/dh/dh_ameth.c
    M crypto/dsa/dsa_ameth.c
    M crypto/ec/ec_ameth.c
    M crypto/rsa/rsa_ameth.c

  Log Message:
  -----------
  Add sensitive memory clean in priv encode
Fixed #18540

Reviewed-by: Tomas Mraz <tomas at openssl.org>
Reviewed-by: Paul Dale <pauli at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18541)