[#EVP_CIPHER_CTX_set_key_length]
= EVP_CIPHER_CTX_set_key_length
:mrdocs:

Set a variable‐length cipher's key length on a cipher context.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_CIPHER_CTX_set_key_length(
    xref:EVP_CIPHER_CTX.adoc[EVP_CIPHER_CTX]* x,
    int keylen);
----

== Return Value

1 on success, or 0 if the length is unsupported.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *x*
| Cipher context whose cipher supports variable key lengths.
| *keylen*
| Desired key length in bytes.
|===


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