[#EVP_CIPHER_CTX_set_cipher_data]
= EVP_CIPHER_CTX_set_cipher_data
:mrdocs:

Replace the cipher‐implementation private data pointer on `ctx.`

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void*
EVP_CIPHER_CTX_set_cipher_data(
    xref:EVP_CIPHER_CTX.adoc[EVP_CIPHER_CTX]* ctx,
    void* cipher_data);
----

== Return Value

The previous cipher‐data pointer.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Cipher context.
| *cipher_data*
| New implementation data pointer (ownership remains with the caller/impl).
|===


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