[#BN_check_prime]
= BN_check_prime
:mrdocs:

Test whether `p` is prime using the library's default primality checks.

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BN_check_prime(
    xref:BIGNUM.adoc[BIGNUM] const* p,
    xref:BN_CTX.adoc[BN_CTX]* ctx,
    xref:BN_GENCB.adoc[BN_GENCB]* cb);
----

== Return Value

1 if probably prime, 0 if composite, or ‐1 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *p*
| Candidate integer.
| *ctx*
| Optional BN_CTX, or NULL to allocate internally.
| *cb*
| Optional progress callback, or NULL.
|===


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