Add null digest implementation to the default provider

This is necessary to keep compatibility with 1.1.1.

Fixes #16660

Reviewed-by: Matt Caswell <matt@openssl.org>
(Me

Add null digest implementation to the default provider

This is necessary to keep compatibility with 1.1.1.

Fixes #16660

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17016)

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