RtlRandom - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
#ifndef _NTRTL_H

_Ret_range_(<=, MAXLONG)
NTSYSAPI
ULONG
NTAPI
RtlRandom(
    _Inout_ PULONG Seed
    );

#endif

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/*
 * RTL forward symbol typedefs
 *
 * This file is part of System Informer.
 */
#ifndef _NTRTL_FWD_H
// Note: ntdll symbols and exports define these forwarders:
// begin_forwarders
#ifndef PHNT_INLINE_NAME_FORWARDERS

#define RtlRandom RtlRandomEx

#endif
// end_forwarders
#endif

View code on GitHub
// ntifs.h

NTSYSAPI ULONG RtlRandom(
  [in, out] PULONG Seed
);
View the official Windows Driver Kit DDI reference

NtDoc

This function is documented in Windows Driver Kit.

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Windows Driver Kit DDI reference (nf-ntifs-rtlrandom)

RtlRandom function

Description

The RtlRandom routine returns a random number that was generated from a given seed value.

Parameters

Seed [in, out]

Unsigned long value from which to generate a random number.

Return value

RtlRandom returns a random number in the range [0..MAXLONG-1].

Remarks

RtlRandom returns values that are uniformly distributed over the range from zero to the maximum possible LONG value less 1 if it is called repeatedly with the same Seed.

The RtlRandomEx function is an improved version of the RtlRandom function that is twice as fast and produces better random numbers.

See also

RtlRandomEx

View the official Windows Driver Kit DDI reference

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