[openssl-users] Guidance on proper usage of OpenSSL_add_all_digests

Jeffrey Walton noloader at gmail.com
Wed Mar 2 19:10:15 UTC 2016

> Finally, for the crypto components, like SHA... I don't believe they
> need explicit initialization unless you are doing something like
> changing the default implementation from software to an engine. The
> SSL part of the library allows you to explicitly add selected
> algorithms to control what algorithms are used in that portion of the
> library.

My bad.. "Library Initialization | libcrypto Initialization"
sates you can use either OpenSSL_add_all_ciphers,
OPENSSL_add_all_algorithms_noconf, or you can pick what you want when
initializing crypto portion of the library.

For picking what you want:

    void MyLIB_init_crypto(void)

The earlier still holds true. Initialize and install lock on the
primary thread. And take care when using static C++ objects.


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