[#AES_cfb128_encrypt]
= AES_cfb128_encrypt
:mrdocs:

Encrypt or decrypt data with AES in 128‐bit CFB mode (deprecated; prefer EVP).

== Synopsis

Declared in `<openssl/aes.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
void
AES_cfb128_encrypt(
    unsigned char const* in,
    unsigned char* out,
    size_t length,
    xref:AES_KEY.adoc[AES_KEY] const* key,
    unsigned char* ivec,
    int* num,
    int const enc);
----

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

[cols="1,4"]
|===
| Name| Description
| *in*
| Input bytes of length `length.`
| *out*
| Output buffer of length `length` (may equal `in).`
| *length*
| Number of bytes to process.
| *key*
| Expanded AES key schedule.
| *ivec*
| 16‐byte IV updated in place.
| *num*
| Feedback offset into the IV (updated; typically starts at 0).
| *enc*
| AES_ENCRYPT to encrypt, or AES_DECRYPT to decrypt.
|===


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