[#RAND_bytes_ex]
= RAND_bytes_ex
:mrdocs:

Fill a buffer with public CSPRNG bytes using a library context and strength.

== Synopsis

Declared in `<openssl/rand.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
RAND_bytes_ex(
    xref:OSSL_LIB_CTX.adoc[OSSL_LIB_CTX]* ctx,
    unsigned char* buf,
    size_t num,
    unsigned int strength);
----

== 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
| *ctx*
| Library context whose public DRBG is used, or NULL for the default.
| *buf*
| Buffer that receives `num` random bytes.
| *num*
| Number of bytes to generate.
| *strength*
| Requested security strength in bits for the generated bytes.
|===


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