[#EVP_MD_CTX_copy_ex]
= EVP_MD_CTX_copy_ex
:mrdocs:

Copy digest context state from `in` into an already allocated `out.`

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_MD_CTX_copy_ex(
    xref:EVP_MD_CTX.adoc[EVP_MD_CTX]* out,
    xref:EVP_MD_CTX.adoc[EVP_MD_CTX] const* in);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *out*
| Destination context (must be initialised); previous state is replaced.
| *in*
| Source context to copy, including algorithm state and associated key material.
|===


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