[#RAND_add]
= RAND_add
:mrdocs:

Mix additional bytes into the PRNG state with an estimated entropy amount.

== Synopsis

Declared in `<openssl/rand.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
RAND_add(
    void const* buf,
    int num,
    double randomness);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *buf*
| Bytes mixed into the generator; contents cannot be recovered from later output.
| *num*
| Number of bytes at `buf.`
| *randomness*
| Estimated randomness in `buf,` in bytes, between 0 and `num.`
|===


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