[#CRYPTO_ccm128_setiv]
= CRYPTO_ccm128_setiv
:mrdocs:

Set the CCM nonce and message length for a subsequent encrypt or decrypt.

== Synopsis

Declared in `<openssl/modes.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
CRYPTO_ccm128_setiv(
    xref:CCM128_CONTEXT-0c.adoc[CCM128_CONTEXT]* ctx,
    unsigned char const* nonce,
    size_t nlen,
    size_t mlen);
----

== Return Value

0 on success, or ‐1 if `nlen` is too short for the configured L.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| CCM context from CRYPTO_ccm128_init().
| *nonce*
| Nonce octets; length must be at least 15 ‐ L for the configured L.
| *nlen*
| Length of `nonce` in bytes.
| *mlen*
| Length of the message that will be encrypted or decrypted.
|===


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