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7ce960e712
Signed-off by: Ye Ting <ting.ye@intel.com> Reviewed-by: Yao Jiewen <jiewen.yao@intel.com> Reviewed-by: Sun Rui <rui.sun@intel.com> Reviewed-by: Long Qin <qin.long@intel.com> git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13300 6f19259b-4bc3-4df7-8a09-765794883524
102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/** @file
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Pseudorandom Number Generator Wrapper Implementation over OpenSSL.
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Copyright (c) 2012, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "InternalCryptLib.h"
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#include <openssl/rand.h>
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#include <Library/PrintLib.h>
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/**
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Sets up the seed value for the pseudorandom number generator.
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This function sets up the seed value for the pseudorandom number generator.
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If Seed is not NULL, then the seed passed in is used.
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If Seed is NULL, then default seed is used.
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@param[in] Seed Pointer to seed value.
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If NULL, default seed is used.
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@param[in] SeedSize Size of seed value.
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If Seed is NULL, this parameter is ignored.
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@retval TRUE Pseudorandom number generator has enough entropy for random generation.
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@retval FALSE Pseudorandom number generator does not have enough entropy for random generation.
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**/
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BOOLEAN
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EFIAPI
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RandomSeed (
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IN CONST UINT8 *Seed OPTIONAL,
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IN UINTN SeedSize
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)
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{
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CHAR8 DefaultSeed[128];
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//
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// Seed the pseudorandom number generator with user-supplied value.
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// NOTE: A cryptographic PRNG must be seeded with unpredictable data.
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//
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if (Seed != NULL) {
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RAND_seed (Seed, (UINT32) SeedSize);
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} else {
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//
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// Retrieve current time.
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//
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AsciiSPrint (
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DefaultSeed,
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sizeof (DefaultSeed),
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"UEFI Crypto Library default seed (%ld)",
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AsmReadTsc ()
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);
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RAND_seed (DefaultSeed, sizeof (DefaultSeed));
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}
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return TRUE;
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}
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/**
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Generates a pseudorandom byte stream of the specified size.
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If Output is NULL, then return FALSE.
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@param[out] Output Pointer to buffer to receive random value.
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@param[in] Size Size of randome bytes to generate.
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@retval TRUE Pseudorandom byte stream generated successfully.
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@retval FALSE Pseudorandom number generator fails to generate due to lack of entropy.
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**/
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BOOLEAN
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EFIAPI
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RandomBytes (
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OUT UINT8 *Output,
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IN UINTN Size
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)
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{
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//
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// Check input parameters.
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//
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if (Output == NULL) {
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return FALSE;
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}
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//
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// Generate random data.
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//
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if (RAND_bytes (Output, (UINT32) Size) != 1) {
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return FALSE;
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}
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return TRUE;
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}
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