[#CRYPTO_ocb128_tag]
= CRYPTO_ocb128_tag
:mrdocs:

Write the computed OCB authentication tag into `tag.`

== Synopsis

Declared in `<openssl/modes.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
CRYPTO_ocb128_tag(
    xref:OCB128_CONTEXT-0a.adoc[OCB128_CONTEXT]* ctx,
    unsigned char* tag,
    size_t len);
----

== Return Value

1 on success, or ‐1 if `len` is invalid.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| OCB context after encryption (and optional AAD) processing.
| *tag*
| Destination buffer for the tag.
| *len*
| Number of tag bytes to write (1–16).
|===


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