[#EVP_CIPHER_get_iv_length]
= EVP_CIPHER_get_iv_length
:mrdocs:

Return the IV length in bytes required by a cipher.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_CIPHER_get_iv_length(xref:EVP_CIPHER-07.adoc[EVP_CIPHER] const* cipher);
----

== Return Value

IV length, or 0 if the cipher does not use an IV.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *cipher*
| Cipher method to query.
|===


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