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/** @file
Random number generator services that uses CPU RNG instructions to
provide random numbers.
Copyright (c) 2021, NUVIA Inc. All rights reserved.<BR>
Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include "BaseRngLibInternals.h"
//
// Limited retry number when valid random data is returned.
// Uses the recommended value defined in Section 7.3.17 of "Intel 64 and IA-32
// Architectures Software Developer's Manual".
//
#define GETRANDOM_RETRY_LIMIT 10
/**
Generates a 16-bit random number.
if Rand is NULL, then ASSERT().
@param[out] Rand Buffer pointer to store the 16-bit random value.
@retval TRUE Random number generated successfully.
@retval FALSE Failed to generate the random number.
**/
BOOLEAN
EFIAPI
GetRandomNumber16 (
OUT UINT16 *Rand
)
{
UINT32 Index;
ASSERT (Rand != NULL);
if (Rand == NULL) {
return FALSE;
}
if (!ArchIsRngSupported ()) {
return FALSE;
}
//
// A loop to fetch a 16 bit random value with a retry count limit.
//
for (Index = 0; Index < GETRANDOM_RETRY_LIMIT; Index++) {
if (ArchGetRandomNumber16 (Rand)) {
return TRUE;
}
}
return FALSE;
}
/**
Generates a 32-bit random number.
if Rand is NULL, then ASSERT().
@param[out] Rand Buffer pointer to store the 32-bit random value.
@retval TRUE Random number generated successfully.
@retval FALSE Failed to generate the random number.
**/
BOOLEAN
EFIAPI
GetRandomNumber32 (
OUT UINT32 *Rand
)
{
UINT32 Index;
ASSERT (Rand != NULL);
if (Rand == NULL) {
return FALSE;
}
if (!ArchIsRngSupported ()) {
return FALSE;
}
//
// A loop to fetch a 32 bit random value with a retry count limit.
//
for (Index = 0; Index < GETRANDOM_RETRY_LIMIT; Index++) {
if (ArchGetRandomNumber32 (Rand)) {
return TRUE;
}
}
return FALSE;
}
/**
Generates a 64-bit random number.
if Rand is NULL, then ASSERT().
@param[out] Rand Buffer pointer to store the 64-bit random value.
@retval TRUE Random number generated successfully.
@retval FALSE Failed to generate the random number.
**/
BOOLEAN
EFIAPI
GetRandomNumber64 (
OUT UINT64 *Rand
)
{
UINT32 Index;
ASSERT (Rand != NULL);
if (Rand == NULL) {
return FALSE;
}
if (!ArchIsRngSupported ()) {
return FALSE;
}
//
// A loop to fetch a 64 bit random value with a retry count limit.
//
for (Index = 0; Index < GETRANDOM_RETRY_LIMIT; Index++) {
if (ArchGetRandomNumber64 (Rand)) {
return TRUE;
}
}
return FALSE;
}
/**
Generates a 128-bit random number.
if Rand is NULL, then ASSERT().
@param[out] Rand Buffer pointer to store the 128-bit random value.
@retval TRUE Random number generated successfully.
@retval FALSE Failed to generate the random number.
**/
BOOLEAN
EFIAPI
GetRandomNumber128 (
OUT UINT64 *Rand
)
{
ASSERT (Rand != NULL);
if (Rand == NULL) {
return FALSE;
}
if (!ArchIsRngSupported ()) {
return FALSE;
}
//
// Read first 64 bits
//
if (!GetRandomNumber64 (Rand)) {
return FALSE;
}
//
// Read second 64 bits
//
return GetRandomNumber64 (++Rand);
}
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