[#EVP_CIPHER_meth_set_do_cipher]
= EVP_CIPHER_meth_set_do_cipher
:mrdocs:

Set the encrypt/decrypt update callback on a custom EVP_CIPHER (deprecated).

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
EVP_CIPHER_meth_set_do_cipher(
    xref:EVP_CIPHER-07.adoc[EVP_CIPHER]* cipher,
    int(* do_cipher)(xref:EVP_CIPHER_CTX.adoc[EVP_CIPHER_CTX]*, unsigned char*, unsigned char const*, size_t));
----

[WARNING]
====
https://en.cppreference.com/cpp/language/attributes/deprecated[Deprecated^]. Use of this entity is allowed but discouraged.
====
== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *cipher*
| Custom cipher method to update.
| *do_cipher*
| Callback that transforms `inl` bytes from `in` to `out,` or NULL to clear.
|===


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