[#CRYPTO_gcm128_setiv]
= CRYPTO_gcm128_setiv
:mrdocs:

Set the GCM IV / nonce for a subsequent encrypt or decrypt operation.

== Synopsis

Declared in `<openssl/modes.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
CRYPTO_gcm128_setiv(
    xref:GCM128_CONTEXT-04.adoc[GCM128_CONTEXT]* ctx,
    unsigned char const* iv,
    size_t len);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| GCM context from CRYPTO_gcm128_new() or CRYPTO_gcm128_init().
| *iv*
| IV octets (commonly 12 bytes for GCM).
| *len*
| Length of `iv` in bytes.
|===


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