[#BN_X931_generate_prime_ex]
= BN_X931_generate_prime_ex
:mrdocs:

Generate an X9.31‐style probable prime derived from parameters `Xp/e` (deprecated).

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
BN_X931_generate_prime_ex(
    xref:BIGNUM.adoc[BIGNUM]* p,
    xref:BIGNUM.adoc[BIGNUM]* p1,
    xref:BIGNUM.adoc[BIGNUM]* p2,
    xref:BIGNUM.adoc[BIGNUM]* Xp1,
    xref:BIGNUM.adoc[BIGNUM]* Xp2,
    xref:BIGNUM.adoc[BIGNUM] const* Xp,
    xref:BIGNUM.adoc[BIGNUM] const* e,
    xref:BN_CTX.adoc[BN_CTX]* ctx,
    xref:BN_GENCB.adoc[BN_GENCB]* cb);
----

[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
| *p*
| Destination for the generated prime.
| *p1*
| Optional destination for auxiliary prime p1, or NULL.
| *p2*
| Optional destination for auxiliary prime p2, or NULL.
| *Xp1*
| Optional random seed for p1, or NULL to generate internally.
| *Xp2*
| Optional random seed for p2, or NULL to generate internally.
| *Xp*
| Random parameter that constrains p.
| *e*
| Public exponent that must be coprime to (p‐1).
| *ctx*
| BN_CTX scratch space.
| *cb*
| Optional progress callback, or NULL.
|===


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