[#CMS_decrypt_set1_key]
= CMS_decrypt_set1_key
:mrdocs:

Install a KEKRecipientInfo key on a CMS ContentInfo so CMS_decrypt can use it.

== Synopsis

Declared in `<openssl/cms.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
CMS_decrypt_set1_key(
    xref:CMS_ContentInfo.adoc[CMS_ContentInfo]* cms,
    unsigned char* key,
    size_t keylen,
    unsigned char const* id,
    size_t idlen);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *cms*
| Enveloped ContentInfo that contains a KEK recipient.
| *key*
| Symmetric key‐encryption key octets.
| *keylen*
| Length of `key` in bytes.
| *id*
| Optional key identifier matching the recipient's keyEncryptionKeyIdentifier, or NULL.
| *idlen*
| Length of `id` in bytes when `id` is non‐NULL.
|===


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