From e5a9e9239b0cf1001d9b91497b4ff3ab4a190b1f Mon Sep 17 00:00:00 2001
From: Mounir IDRASSI <mounir.idrassi@idrix.fr>
Date: Tue, 4 Oct 2016 13:21:48 +0200
Subject: Crypto: Use SIMD optimized Serpent implementation from Botan. 2.5x
 speed gain factor. Update credits and copyrights notice.

---
 src/Common/Crypto.c | 38 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 36 insertions(+), 2 deletions(-)

(limited to 'src/Common/Crypto.c')

diff --git a/src/Common/Crypto.c b/src/Common/Crypto.c
index cae705b6..49ccbde5 100644
--- a/src/Common/Crypto.c
+++ b/src/Common/Crypto.c
@@ -232,6 +232,21 @@ void EncipherBlocks (int cipher, void *dataPtr, void *ks, size_t blockCount)
 		KeRestoreFloatingPointState (&floatingPointState);
 #endif
 	}
+#if CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE
+	else if (cipher == SERPENT
+			&& (blockCount >= 4)
+			&& HasSSE2()
+#if defined (TC_WINDOWS_DRIVER) && !defined (_WIN64)
+			&& NT_SUCCESS (KeSaveFloatingPointState (&floatingPointState))
+#endif
+		)
+	{
+		serpent_encrypt_blocks (data, data, blockCount, ks);
+#if defined (TC_WINDOWS_DRIVER) && !defined (_WIN64)
+		KeRestoreFloatingPointState (&floatingPointState);
+#endif
+	}
+#endif
 	else if (cipher == GOST89)	{
 			gost_encrypt(data, data, ks, (int)blockCount);
 	}
@@ -312,6 +327,21 @@ void DecipherBlocks (int cipher, void *dataPtr, void *ks, size_t blockCount)
 		KeRestoreFloatingPointState (&floatingPointState);
 #endif
 	}
+#if CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE
+	else if (cipher == SERPENT
+			&& (blockCount >= 4)
+			&& HasSSE2()
+#if defined (TC_WINDOWS_DRIVER) && !defined (_WIN64)
+			&& NT_SUCCESS (KeSaveFloatingPointState (&floatingPointState))
+#endif
+		)
+	{
+		serpent_decrypt_blocks (data, data, blockCount, ks);
+#if defined (TC_WINDOWS_DRIVER) && !defined (_WIN64)
+		KeRestoreFloatingPointState (&floatingPointState);
+#endif
+	}
+#endif
 	else if (cipher == GOST89)	{
 			gost_decrypt(data, data, ks, (int)blockCount);
 	}
@@ -383,8 +413,12 @@ int CipherGetKeyScheduleSize (int cipherId)
 
 BOOL CipherSupportsIntraDataUnitParallelization (int cipher)
 {
-	return cipher == AES && IsAesHwCpuSupported() ||
-		cipher == GOST89;
+	return (cipher == AES && IsAesHwCpuSupported()) 
+		|| (cipher == GOST89)
+#if CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE
+		|| (cipher == SERPENT && HasSSE2())
+#endif
+		;
 }
 
 #endif
-- 
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