Add LEA-128 SSSE3 implementation (GH #669)

LEA-128(128) from 6.73 cpb to 2.84 cpb on modern Core-i5 6400. LEA-128 from 10.12 cpb to 7.84 cpb antique Core2 Duo.

1 files changed, 42 insertions, 0 deletions

diff --git a/lea.cpp b/lea.cpp
index 008dcf8b..780bb407 100644
--- a/lea.cpp
+++ b/lea.cpp
@@ -18,6 +18,7 @@
 

 #include "lea.h"

 #include "misc.h"

+#include "cpu.h"

 

 ANONYMOUS_NAMESPACE_BEGIN

 

@@ -554,6 +555,16 @@ inline void SetKey256(word32 rkey[192], const word32 key[8])
 

 NAMESPACE_BEGIN(CryptoPP)

 

+#if CRYPTOPP_LEA_ADVANCED_PROCESS_BLOCKS

+extern void LEA_SplatKeys_SSSE3(SecBlock<word32>& rkeys);

+

+extern size_t LEA_Enc_AdvancedProcessBlocks_SSSE3(const word32* subKeys, size_t rounds,

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

+

+extern size_t LEA_Dec_AdvancedProcessBlocks_SSSE3(const word32* subKeys, size_t rounds,

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

+#endif

+

 void LEA::Base::UncheckedSetKey(const byte *userKey, unsigned int keyLength, const NameValuePairs &params)

 {

     CRYPTOPP_UNUSED(params);

@@ -584,6 +595,15 @@ void LEA::Base::UncheckedSetKey(const byte *userKey, unsigned int keyLength, con
     default:

         CRYPTOPP_ASSERT(0);;

     }

+

+#if (CRYPTOPP_SSSE3_AVAILABLE)

+    if (HasSSSE3())

+    {

+        // If we pre-splat the round keys at setup then we avoid a shuffle

+        // at runtime for each subkey used during encryption and decryption.

+        LEA_SplatKeys_SSSE3(m_rkey);

+    }

+#endif

 }

 

 void LEA::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const

@@ -826,4 +846,26 @@ void LEA::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byt
     oblock(m_temp[0])(m_temp[1])(m_temp[2])(m_temp[3]);

 }

 

+#if CRYPTOPP_LEA_ADVANCED_PROCESS_BLOCKS

+size_t LEA::Enc::AdvancedProcessBlocks(const byte *inBlocks, const byte *xorBlocks,

+        byte *outBlocks, size_t length, word32 flags) const

+{

+    if (HasSSSE3()) {

+        return LEA_Enc_AdvancedProcessBlocks_SSSE3(m_rkey, m_rounds,

+            inBlocks, xorBlocks, outBlocks, length, flags);

+    }

+    return BlockTransformation::AdvancedProcessBlocks(inBlocks, xorBlocks, outBlocks, length, flags);

+}

+

+size_t LEA::Dec::AdvancedProcessBlocks(const byte *inBlocks, const byte *xorBlocks,

+        byte *outBlocks, size_t length, word32 flags) const

+{

+    if (HasSSSE3()) {

+        return LEA_Dec_AdvancedProcessBlocks_SSSE3(m_rkey, m_rounds,

+            inBlocks, xorBlocks, outBlocks, length, flags);

+    }

+    return BlockTransformation::AdvancedProcessBlocks(inBlocks, xorBlocks, outBlocks, length, flags);

+}

+#endif  // CRYPTOPP_LEA_ADVANCED_PROCESS_BLOCKS

+

 NAMESPACE_END