[#EVP_CIPHER_CTX_get_iv_length]
= EVP_CIPHER_CTX_get_iv_length
:mrdocs:

Return the IV length in bytes for the cipher currently set on `ctx.`

== Synopsis

Declared in `<openssl/evp.h>`

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

== Return Value

IV length in bytes, or 0 if the cipher uses no IV / on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Initialised cipher context.
|===


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