Increase XTS parallel blocks on Aarch64 and PowerPC

1 files changed, 8 insertions, 2 deletions

diff --git a/xts.h b/xts.h
index 16093932..c6bbc747 100644
--- a/xts.h
+++ b/xts.h
@@ -134,10 +134,16 @@ protected:
         {return const_cast<XTS_ModeBase*>(this)->AccessTweakCipher();}

 

     // Buffers are sized based on ParallelBlocks

-    SecByteBlock m_xregister;

-    SecByteBlock m_xworkspace;

+    AlignedSecByteBlock m_xregister;

+    AlignedSecByteBlock m_xworkspace;

 

+    // Intel lacks the SSE registers to run 8 or 12 parallel blocks.

+    // Do not change this value after compiling. It has no effect.

+#if CRYPTOPP_BOOL_X64 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X86

     enum {ParallelBlocks = 4};

+#else

+    enum {ParallelBlocks = 12};

+#endif

 };

 

 /// \brief XTS block cipher mode of operation implementation