[#EVP_CIPHER_CTX_set_num]
= EVP_CIPHER_CTX_set_num
:mrdocs:

Set the partial‐block offset counter stored in a cipher context.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_CIPHER_CTX_set_num(
    xref:EVP_CIPHER_CTX.adoc[EVP_CIPHER_CTX]* ctx,
    int num);
----

== Return Value

1 on success.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Cipher context to update.
| *num*
| New offset value used by some cipher modes for leftover bytes.
|===


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