[#EVP_SIGNATURE_do_all_provided]
= EVP_SIGNATURE_do_all_provided
:mrdocs:

Call `fn` for every signature algorithm implementation available from providers.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
EVP_SIGNATURE_do_all_provided(
    xref:OSSL_LIB_CTX.adoc[OSSL_LIB_CTX]* libctx,
    void(* fn)(xref:EVP_SIGNATURE.adoc[EVP_SIGNATURE]*, void*),
    void* data);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *libctx*
| Library context whose providers are queried, or NULL for the default context.
| *fn*
| Callback invoked once per EVP_SIGNATURE; must not free `signature.`
| *data*
| Opaque pointer passed through to `fn.`
|===


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