[#BN_mul]
= BN_mul
:mrdocs:

Multiply two BIGNUMs: `r` = `a` * `b.`

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BN_mul(
    xref:BIGNUM.adoc[BIGNUM]* r,
    xref:BIGNUM.adoc[BIGNUM] const* a,
    xref:BIGNUM.adoc[BIGNUM] const* b,
    xref:BN_CTX.adoc[BN_CTX]* ctx);
----

== Return Value

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *r*
| Destination product.
| *a*
| First multiplicand.
| *b*
| Second multiplicand.
| *ctx*
| BN_CTX scratch space, or NULL.
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#