[#AES_set_decrypt_key]
= AES_set_decrypt_key
:mrdocs:

Expand a user key into an AES decryption key schedule (deprecated; prefer EVP).

== Synopsis

Declared in `<openssl/aes.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
AES_set_decrypt_key(
    unsigned char const* userKey,
    int const bits,
    xref:AES_KEY.adoc[AES_KEY]* key);
----

[WARNING]
====
https://en.cppreference.com/cpp/language/attributes/deprecated[Deprecated^]. Use of this entity is allowed but discouraged.
====
== Return Value

0 on success, or a negative value on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *userKey*
| Raw AES key bytes (16, 24, or 32 bytes for 128/192/256‐bit).
| *bits*
| Key length in bits (128, 192, or 256).
| *key*
| Destination expanded key schedule for AES_decrypt() and decrypting modes.
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#