CryptoPkg/BaseCryptLib:time overflow

[mirror_edk2.git] / CryptoPkg / Library / BaseCryptLib / SysCall / TimerWrapper.c

/** @file\r
  C Run-Time Libraries (CRT) Time Management Routines Wrapper Implementation\r
  for OpenSSL-based Cryptographic Library (used in DXE & RUNTIME).\r
\r
Copyright (c) 2010 - 2018, Intel Corporation. All rights reserved.<BR>\r
SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include <Uefi.h>\r
#include <CrtLibSupport.h>\r
#include <Library/UefiRuntimeServicesTableLib.h>\r
\r
//\r
// -- Time Management Routines --\r
//\r
\r
#define SECSPERMIN   (60)\r
#define SECSPERHOUR  (60 * 60)\r
#define SECSPERDAY   (24 * SECSPERHOUR)\r
\r
//\r
//  The arrays give the cumulative number of days up to the first of the\r
//  month number used as the index (1 -> 12) for regular and leap years.\r
//  The value at index 13 is for the whole year.\r
//\r
UINTN  CumulativeDays[2][14] = {\r
  {\r
    0,\r
    0,\r
    31,\r
    31 + 28,\r
    31 + 28 + 31,\r
    31 + 28 + 31 + 30,\r
    31 + 28 + 31 + 30 + 31,\r
    31 + 28 + 31 + 30 + 31 + 30,\r
    31 + 28 + 31 + 30 + 31 + 30 + 31,\r
    31 + 28 + 31 + 30 + 31 + 30 + 31 + 31,\r
    31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30,\r
    31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,\r
    31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30,\r
    31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31\r
  },\r
  {\r
    0,\r
    0,\r
    31,\r
    31 + 29,\r
    31 + 29 + 31,\r
    31 + 29 + 31 + 30,\r
    31 + 29 + 31 + 30 + 31,\r
    31 + 29 + 31 + 30 + 31 + 30,\r
    31 + 29 + 31 + 30 + 31 + 30 + 31,\r
    31 + 29 + 31 + 30 + 31 + 30 + 31 + 31,\r
    31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30,\r
    31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,\r
    31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30,\r
    31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31\r
  }\r
};\r
\r
/* Check the year is leap or not. */\r
// BOOLEAN IsLeap(\r
//  INTN timer\r
//  )\r
BOOLEAN\r
IsLeap (\r
  time_t  timer\r
  )\r
{\r
  INT64  Remainder1;\r
  INT64  Remainder2;\r
  INT64  Remainder3;\r
\r
  DivS64x64Remainder (timer, 4, &Remainder1);\r
  DivS64x64Remainder (timer, 100, &Remainder2);\r
  DivS64x64Remainder (timer, 400, &Remainder3);\r
\r
  return (Remainder1 == 0 && (Remainder2 != 0 || Remainder3 == 0));\r
}\r
\r
/* Get the system time as seconds elapsed since midnight, January 1, 1970. */\r
// INTN time(\r
//  INTN *timer\r
//  )\r
time_t\r
time (\r
  time_t  *timer\r
  )\r
{\r
  EFI_STATUS  Status;\r
  EFI_TIME    Time;\r
  time_t      CalTime;\r
  UINTN       Year;\r
\r
  //\r
  // Get the current time and date information\r
  //\r
  Status = gRT->GetTime (&Time, NULL);\r
  if (EFI_ERROR (Status) || (Time.Year < 1970)) {\r
    return 0;\r
  }\r
\r
  //\r
  // Years Handling\r
  // UTime should now be set to 00:00:00 on Jan 1 of the current year.\r
  //\r
  for (Year = 1970, CalTime = 0; Year != Time.Year; Year++) {\r
    CalTime = CalTime + (time_t)(CumulativeDays[IsLeap (Year)][13] * SECSPERDAY);\r
  }\r
\r
  //\r
  // Add in number of seconds for current Month, Day, Hour, Minute, Seconds, and TimeZone adjustment\r
  //\r
  CalTime = CalTime +\r
            (time_t)((Time.TimeZone != EFI_UNSPECIFIED_TIMEZONE) ? (Time.TimeZone * 60) : 0) +\r
            (time_t)(CumulativeDays[IsLeap (Time.Year)][Time.Month] * SECSPERDAY) +\r
            (time_t)(((Time.Day > 0) ? Time.Day - 1 : 0) * SECSPERDAY) +\r
            (time_t)(Time.Hour * SECSPERHOUR) +\r
            (time_t)(Time.Minute * 60) +\r
            (time_t)Time.Second;\r
\r
  if (timer != NULL) {\r
    *timer = CalTime;\r
  }\r
\r
  return CalTime;\r
}\r
\r
//\r
// Convert a time value from type time_t to struct tm.\r
//\r
struct tm *\r
gmtime (\r
  const time_t  *timer\r
  )\r
{\r
  struct tm  *GmTime;\r
  UINT64     DayNo;\r
  UINT64     DayRemainder;\r
  time_t     Year;\r
  time_t     YearNo;\r
  UINT32     TotalDays;\r
  UINT32     MonthNo;\r
  INT64      Remainder;\r
\r
  if (timer == NULL) {\r
    return NULL;\r
  }\r
\r
  GmTime = malloc (sizeof (struct tm));\r
  if (GmTime == NULL) {\r
    return NULL;\r
  }\r
\r
  ZeroMem ((VOID *)GmTime, (UINTN)sizeof (struct tm));\r
\r
  DayNo        = (UINT64)DivS64x64Remainder (*timer, SECSPERDAY, &Remainder);\r
  DayRemainder = (UINT64)Remainder;\r
\r
  DivS64x64Remainder (DayRemainder, SECSPERMIN, &Remainder);\r
  GmTime->tm_sec = (int)Remainder;\r
  DivS64x64Remainder (DayRemainder, SECSPERHOUR, &Remainder);\r
  GmTime->tm_min  = (int)DivS64x64Remainder (Remainder, SECSPERMIN, NULL);\r
  GmTime->tm_hour = (int)DivS64x64Remainder (DayRemainder, SECSPERHOUR, NULL);\r
  DivS64x64Remainder ((DayNo + 4), 7, &Remainder);\r
  GmTime->tm_wday = (int)Remainder;\r
\r
  for (Year = 1970, YearNo = 0; DayNo > 0; Year++) {\r
    TotalDays = (UINT32)(IsLeap (Year) ? 366 : 365);\r
    if (DayNo >= TotalDays) {\r
      DayNo = (UINT64)(DayNo - TotalDays);\r
      YearNo++;\r
    } else {\r
      break;\r
    }\r
  }\r
\r
  GmTime->tm_year = (int)(YearNo + (1970 - 1900));\r
  GmTime->tm_yday = (int)DayNo;\r
\r
  for (MonthNo = 12; MonthNo > 1; MonthNo--) {\r
    if (DayNo >= CumulativeDays[IsLeap (Year)][MonthNo]) {\r
      DayNo = (UINT64)(DayNo - (UINT32)(CumulativeDays[IsLeap (Year)][MonthNo]));\r
      break;\r
    }\r
  }\r
\r
  GmTime->tm_mon  = (int)MonthNo - 1;\r
  GmTime->tm_mday = (int)DayNo + 1;\r
\r
  GmTime->tm_isdst  = 0;\r
  GmTime->tm_gmtoff = 0;\r
  GmTime->tm_zone   = NULL;\r
\r
  return GmTime;\r
}\r