[#EVP_CIPHER_do_all_provided]
= EVP_CIPHER_do_all_provided
:mrdocs:

Invoke a callback for every cipher implementation available from providers.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
EVP_CIPHER_do_all_provided(
    xref:OSSL_LIB_CTX.adoc[OSSL_LIB_CTX]* libctx,
    void(* fn)(xref:EVP_CIPHER-07.adoc[EVP_CIPHER]*, void*),
    void* arg);
----

== 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_CIPHER; must not free `cipher.`
| *arg*
| Opaque pointer passed through to `fn.`
|===


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