[#IDEA_cfb64_encrypt]
= IDEA_cfb64_encrypt
:mrdocs:

Encrypt or decrypt data with IDEA in 64‐bit CFB mode (deprecated; prefer EVP).

== Synopsis

Declared in `<openssl/idea.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
void
IDEA_cfb64_encrypt(
    unsigned char const* in,
    unsigned char* out,
    long length,
    xref:IDEA_KEY_SCHEDULE.adoc[IDEA_KEY_SCHEDULE]* ks,
    unsigned char* iv,
    int* num,
    int 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.
| *ks*
| Expanded IDEA encryption schedule.
| *iv*
| 8‐byte IV updated in place.
| *num*
| Feedback offset into the IV (updated; typically starts at 0).
| *enc*
| IDEA_ENCRYPT to encrypt, or IDEA_DECRYPT to decrypt.
|===


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