Add SSSE3 intrinsics for SPECK-128 (GH #538)

Performance increased by about 100% on a 3.1 GHz Core i5 Skylake. Throughput went from about 7.3 cpb to about 3.5 cpb. Not bad for a software-based implementation of a block cipher

1 files changed, 9 insertions, 2 deletions

diff --git a/speck.h b/speck.h
index 7f4acc38..037dab92 100644
--- a/speck.h
+++ b/speck.h
@@ -45,12 +45,13 @@ template <class W>
 struct SPECK_Base

 {

     virtual ~SPECK_Base() {}

-    SPECK_Base() : m_kwords(0) {}

+    SPECK_Base() : m_kwords(0), m_rounds(0) {}

 

     typedef SecBlock<W, AllocatorWithCleanup<W, true> > AlignedSecBlock;

     mutable AlignedSecBlock m_wspace;  // workspace

-    AlignedSecBlock         m_rkey;    // round keys

+    AlignedSecBlock         m_rkeys;   // round keys

     unsigned int            m_kwords;  // number of key words

+    unsigned int            m_rounds;  // number of rounds

 };

 

 //! \class SPECK64

@@ -141,6 +142,9 @@ public:
     {

     protected:

         void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;

+#if CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X64

+        size_t AdvancedProcessBlocks(const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags) const;

+#endif

     };

 

     //! \brief Provides implementation for encryption transformation

@@ -151,6 +155,9 @@ public:
     {

     protected:

         void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;

+#if CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X64

+        size_t AdvancedProcessBlocks(const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags) const;

+#endif

     };

 

     typedef BlockCipherFinal<ENCRYPTION, Enc> Encryption;