[#BN_X931_generate_Xpq]
= BN_X931_generate_Xpq
:mrdocs:

Generate random X9.31 parameters Xp and Xq of half the requested RSA bit length (deprecated).

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
BN_X931_generate_Xpq(
    xref:BIGNUM.adoc[BIGNUM]* Xp,
    xref:BIGNUM.adoc[BIGNUM]* Xq,
    int nbits,
    xref:BN_CTX.adoc[BN_CTX]* ctx);
----

[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
| *Xp*
| Destination for the first random parameter (top bits set for the X9.31 range).
| *Xq*
| Destination for the second random parameter; |Xp ‐ Xq| is forced above 2ˆ(nbits/2 ‐ 100).
| *nbits*
| Total RSA modulus bit length (at least 1024 and a multiple of 256).
| *ctx*
| BN_CTX for temporaries and private RNG.
|===


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