Revision: 18791
http://sourceforge.net/p/edk2/code/18791
Author: vanjeff
Date: 2015-11-16 06:52:09 +0000 (Mon, 16 Nov 2015)
Log Message:
-----------
MdePkg: Create GetRandomNumber128 in RngLib
Declare GetRandomNumber128 in RngLib.h.
Create GetRandomNumber128 in BaseRngLib, which is simply calling
GetRandomNumber64 twice.
A GetRandomNumber128 function allows platforms with 128bit HWRNGs to
save on IO overhead that comes from having to prime the HWRNG device
before each read operation.
Using the HWRNG installed on the HP ProLiant m400 moonshot cartridge,
this will save about 50ms per RAW Entropy operation as compared with
calling GetRandomNumber64 twice.
(Sync patch r18590 from main trunk.)
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Thomas Palmer <[email protected]>
Reviewed-by: Samer El-Haj-Mahmoud <[email protected]>
Reviewed-by: Michael Kinney <[email protected]>
Reviewed-by: Chao Zhang <[email protected]>
Reviewed-by: Qin Long <[email protected]>
Revision Links:
--------------
http://sourceforge.net/p/edk2/code/18590
Modified Paths:
--------------
branches/UDK2015/MdePkg/Include/Library/RngLib.h
branches/UDK2015/MdePkg/Library/BaseRngLib/BaseRng.c
Modified: branches/UDK2015/MdePkg/Include/Library/RngLib.h
===================================================================
--- branches/UDK2015/MdePkg/Include/Library/RngLib.h 2015-11-16 06:51:08 UTC
(rev 18790)
+++ branches/UDK2015/MdePkg/Include/Library/RngLib.h 2015-11-16 06:52:09 UTC
(rev 18791)
@@ -66,4 +66,21 @@
OUT UINT64 *Rand
);
+/**
+ 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
+ );
+
#endif // __RNG_LIB_H__
Modified: branches/UDK2015/MdePkg/Library/BaseRngLib/BaseRng.c
===================================================================
--- branches/UDK2015/MdePkg/Library/BaseRngLib/BaseRng.c 2015-11-16
06:51:08 UTC (rev 18790)
+++ branches/UDK2015/MdePkg/Library/BaseRngLib/BaseRng.c 2015-11-16
06:52:09 UTC (rev 18791)
@@ -155,3 +155,35 @@
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);
+
+ //
+ // Read first 64 bits
+ //
+ if (!GetRandomNumber64 (Rand)) {
+ return FALSE;
+ }
+
+ //
+ // Read second 64 bits
+ //
+ return GetRandomNumber64 (++Rand);
+}
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