[#RSA_X931_hash_id]
= RSA_X931_hash_id
:mrdocs:

Return the X9.31 hash algorithm identifier byte for digest NID `nid` (deprecated).

== Synopsis

Declared in `<openssl/rsa.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
RSA_X931_hash_id(int nid);
----

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

Hash‐ID byte used in X9.31 encoding, or ‐1 if `nid` is unsupported.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *nid*
| Digest NID such as NID_sha1 or NID_sha256.
|===


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