[#EVP_sm4_cfb128]
= EVP_sm4_cfb128
:mrdocs:

Return the EVP_CIPHER for SM4 in 128‐bit CFB mode.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:EVP_CIPHER-07.adoc[EVP_CIPHER] const*
EVP_sm4_cfb128();
----

== Return Value

Pointer to the cipher method, or NULL if unavailable in this build.


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