[#EVP_MD_CTX_gettable_params]
= EVP_MD_CTX_gettable_params
:mrdocs:

Describe OSSL_PARAM keys that can be retrieved from digest context `ctx.`

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:OSSL_PARAM.adoc[OSSL_PARAM] const*
EVP_MD_CTX_gettable_params(xref:EVP_MD_CTX.adoc[EVP_MD_CTX]* ctx);
----

== Return Value

NULL‐terminated OSSL_PARAM descriptor array, or NULL on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Digest context whose gettable parameters are queried.
|===


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