[#EVP_CIPHER_CTX_copy]
= EVP_CIPHER_CTX_copy
:mrdocs:

Copy the cipher state from one context into another.

== Synopsis

Declared in `<openssl/evp.h>`

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

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *out*
| Destination context; must already be allocated and is reset as needed.
| *in*
| Source context whose algorithm state is duplicated.
|===


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