[#CMS_EncryptedData_set1_key]
= CMS_EncryptedData_set1_key
:mrdocs:

Set the content‐encryption cipher and copy the symmetric key into a CMS EncryptedData.

== Synopsis

Declared in `<openssl/cms.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
CMS_EncryptedData_set1_key(
    xref:CMS_ContentInfo.adoc[CMS_ContentInfo]* cms,
    xref:EVP_CIPHER-07.adoc[EVP_CIPHER] const* ciph,
    unsigned char const* key,
    size_t keylen);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *cms*
| ContentInfo expected to contain EncryptedData (AEAD ciphers are not supported).
| *ciph*
| Symmetric cipher whose ASN.1 parameters are recorded.
| *key*
| Symmetric key bytes to copy.
| *keylen*
| Length of `key` in octets.
|===


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