Add ChaCha SSE2 implementation

Thanks to Jack Lloyd and Botan for allowing us to use the implementation.
The numbers for SSE2 are very good. When compared with Salsa20 ASM the results are:
  * Salsa20 2.55 cpb; ChaCha/20 2.90 cpb
  * Salsa20/12 1.61 cpb; ChaCha/12 1.90 cpb
  * Salsa20/8 1.34 cpb; ChaCha/8 1.5 cpb

1 files changed, 1 insertions, 0 deletions

diff --git a/salsa.h b/salsa.h
index f86bb61b..7765c919 100644
--- a/salsa.h
+++ b/salsa.h
@@ -41,6 +41,7 @@ protected:
 	void CipherResynchronize(byte *keystreamBuffer, const byte *IV, size_t length);

 	bool CipherIsRandomAccess() const {return true;}

 	void SeekToIteration(lword iterationCount);

+

 #if (CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X64)

 	unsigned int GetAlignment() const;

 	unsigned int GetOptimalBlockSize() const;