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document provider dependency handling

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Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24884)
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Michael Baentsch 2024-07-15 06:54:48 +02:00 committed by Tomas Mraz
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doc/man7/provider.pod
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@ -227,6 +227,18 @@ MODE is only present where applicable.
Other aliases may exist for example where standards bodies or common practice
use alternative names or names that OpenSSL has used historically.
=head3 Provider dependencies
Providers may depend for their proper operation on the availability of
(functionality implemented in) other providers. As there is no mechanism to
express such dependencies towards the OpenSSL core, provider authors must
take care that such dependencies are either completely avoided or made visible
to users, e.g., by documentation and/or defensive programming, e.g.,
outputting error messages if required external dependencies are not available,
e.g., when no provider implementing the required functionality has been
activated. In particular, provider initialization should not depend on other
providers already having been initialized.
=head1 OPENSSL PROVIDERS
OpenSSL provides a number of its own providers. These are the default, base,