CryptRand.c

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#include "InternalCryptLib.h"
#include <Library/RngLib.h>
 
BOOLEAN
EFIAPI
RandomSeed (
  IN  CONST  UINT8  *Seed  OPTIONAL,
  IN  UINTN         SeedSize
  )
{
  return TRUE;
}
 
BOOLEAN
EFIAPI
RandomBytes (
  OUT  UINT8  *Output,
  IN   UINTN  Size
  )
{
  BOOLEAN          Ret;
  volatile UINT64  TempRand;
 
  //
  // Check input parameters.
  //
  if ((Output == NULL) || (Size > INT_MAX)) {
    return FALSE;
  }
 
  Ret = FALSE;
 
  while (Size > 0) {
    // Use RngLib to get random number
    Ret = GetRandomNumber64 ((UINT64 *)&TempRand);
 
    if (!Ret) {
      TempRand = 0;
      return Ret;
    }
 
    if (Size >= sizeof (TempRand)) {
      *((UINT64 *)Output) = TempRand;
      Output             += sizeof (UINT64);
      Size               -= sizeof (TempRand);
    } else {
      CopyMem (Output, (VOID *)&TempRand, Size);
      Size = 0;
    }
  }
 
  TempRand = 0;
  return Ret;
}
 
INT32
MbedtlsRand (
  VOID   *RngState,
  UINT8  *Output,
  UINTN  Len
  )
{
  BOOLEAN  Result;
 
  Result = RandomBytes (Output, Len);
 
  return Result ? 0 : -1;
}