[#CMS_EncryptedData_decrypt]
= CMS_EncryptedData_decrypt
:mrdocs:

Decrypt a CMS EncryptedData ContentInfo with a symmetric key.

== Synopsis

Declared in `<openssl/cms.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
CMS_EncryptedData_decrypt(
    xref:CMS_ContentInfo.adoc[CMS_ContentInfo]* cms,
    unsigned char const* key,
    size_t keylen,
    xref:BIO.adoc[BIO]* dcont,
    xref:BIO.adoc[BIO]* out,
    unsigned int flags);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *cms*
| EncryptedData ContentInfo to decrypt (AEAD ciphers are not supported).
| *key*
| Symmetric decryption key bytes.
| *keylen*
| Length of `key` in bytes.
| *dcont*
| Detached encrypted‐content BIO, or NULL when content is embedded.
| *out*
| BIO that receives the decrypted plaintext.
| *flags*
| Optional CMS flags (for example CMS_TEXT).
|===


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