[#GetRandBytes]
= GetRandBytes
:mrdocs:

Generate random data via the internal PRNG.

== Synopsis

Declared in `<random.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
GetRandBytes(std::span<unsigned char> bytes) noexcept;
----

== Description

These functions are designed to be fast (sub microsecond), but do not necessarily meaningfully add entropy to the PRNG state.

In test mode (see SeedRandomForTest in src/test/util/random.h), the normal PRNG state is bypassed, and a deterministic, seeded, PRNG is used instead.

Thread‐safe.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bytes*
| The output buffer to fill with random data.
|===


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