[#RSA_padding_add_X931]
= RSA_padding_add_X931
:mrdocs:

Apply ANSI X9.31 padding to a message block (deprecated).

== Synopsis

Declared in `<openssl/rsa.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
RSA_padding_add_X931(
    unsigned char* to,
    int tlen,
    unsigned char const* f,
    int fl);
----

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

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *to*
| Destination encoded block of length `tlen.`
| *tlen*
| RSA modulus size in bytes.
| *f*
| Message / hash bytes to pad.
| *fl*
| Length of `f` in bytes.
|===


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