[#BN_rand_range_ex]
= BN_rand_range_ex
:mrdocs:

Generate a cryptographically strong uniform random BIGNUM in [0, range).]

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BN_rand_range_ex(
    xref:BIGNUM.adoc[BIGNUM]* r,
    xref:BIGNUM.adoc[BIGNUM] const* range,
    unsigned int strength,
    xref:BN_CTX.adoc[BN_CTX]* ctx);
----

== Return Value

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *r*
| Destination for the random value.
| *range*
| Exclusive upper bound; must be positive.
| *strength*
| Desired security strength in bits for the RNG draw.
| *ctx*
| BN_CTX for temporary storage, or NULL.
|===


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