====== openssl ======

===== Enable legacy provider =====

  * Edit ''/etc/ssl/openssl.cnf'':

<code>
[openssl_init]
providers = provider_sect

# List of providers to load
[provider_sect]
default = default_sect
legacy = legacy_sect

[default_sect]
activate = 1

[legacy_sect]
activate = 1
</code>

  * Check:

<code>
$ echo -n "foobar" | openssl md4
MD4(stdin)= 547aefd231dcbaac398625718336f143
</code>