[#BN_nnmod]
= BN_nnmod
:mrdocs:

Compute a non‐negative remainder `r` = `m` mod `d` (0 <= r < |d|).

== Synopsis

Declared in `<openssl/bn.h>`

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

== Return Value

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *r*
| Destination remainder.
| *m*
| Dividend.
| *d*
| Modulus (must be non‐zero).
| *ctx*
| BN_CTX scratch space.
|===


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