[#RAND_bytes]
= RAND_bytes
:mrdocs:

Fill a buffer with cryptographically strong random bytes from the public CSPRNG.

== Synopsis

Declared in `<openssl/rand.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
RAND_bytes(
    unsigned char* buf,
    int num);
----

== Return Value

1 on success, ‐1 if not supported by the current RAND method, or 0 on other failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *buf*
| Buffer that receives `num` random bytes.
| *num*
| Number of bytes to generate.
|===


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