diff --git a/config.h b/config.h
index ae9dd798..4b543ae9 100644
--- a/config.h
+++ b/config.h
@@ -416,6 +416,14 @@ NAMESPACE_END
 	#define CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE 0
 #endif
 
+// Intrinsics availible in GCC 4.3 (http://gcc.gnu.org/gcc-4.3/changes.html) and
+//   MSVC 2008 (http://msdn.microsoft.com/en-us/library/bb892950%28v=vs.90%29.aspx)
+#if !defined(CRYPTOPP_DISABLE_SSE4) && ((_MSC_VER >= 1500) || defined(__SSE4_1__) || defined(__SSE4_2__))
+	#define CRYPTOPP_BOOL_SSE4_INTRINSICS_AVAILABLE 1
+#else
+	#define CRYPTOPP_BOOL_SSE4_INTRINSICS_AVAILABLE 0
+#endif
+
 #if !defined(CRYPTOPP_DISABLE_SSSE3) && !defined(CRYPTOPP_DISABLE_AESNI) && CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE && (CRYPTOPP_GCC_VERSION >= 40400 || _MSC_FULL_VER >= 150030729 || __INTEL_COMPILER >= 1110 || defined(__AES__))
 	#define CRYPTOPP_BOOL_AESNI_INTRINSICS_AVAILABLE 1
 #else
diff --git a/config.recommend b/config.recommend
index 343d41b8..2dba9225 100644
--- a/config.recommend
+++ b/config.recommend
@@ -416,6 +416,14 @@ NAMESPACE_END
 	#define CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE 0
 #endif
 
+// Intrinsics availible in GCC 4.3 (http://gcc.gnu.org/gcc-4.3/changes.html) and
+//   MSVC 2008 (http://msdn.microsoft.com/en-us/library/bb892950%28v=vs.90%29.aspx)
+#if !defined(CRYPTOPP_DISABLE_SSE4) && ((_MSC_VER >= 1500) || defined(__SSE4_1__) || defined(__SSE4_2__))
+	#define CRYPTOPP_BOOL_SSE4_INTRINSICS_AVAILABLE 1
+#else
+	#define CRYPTOPP_BOOL_SSE4_INTRINSICS_AVAILABLE 0
+#endif
+
 #if !defined(CRYPTOPP_DISABLE_SSSE3) && !defined(CRYPTOPP_DISABLE_AESNI) && CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE && (CRYPTOPP_GCC_VERSION >= 40400 || _MSC_FULL_VER >= 150030729 || __INTEL_COMPILER >= 1110 || defined(__AES__))
 	#define CRYPTOPP_BOOL_AESNI_INTRINSICS_AVAILABLE 1
 #else
diff --git a/cpu.cpp b/cpu.cpp
index 2b041321..313d3e39 100644
--- a/cpu.cpp
+++ b/cpu.cpp
@@ -165,7 +165,7 @@ static bool TrySSE2()
 }
 
 bool g_x86DetectionDone = false;
-bool g_hasMMX = false, g_hasISSE = false, g_hasSSE2 = false, g_hasSSSE3 = false, g_hasAESNI = false, g_hasCLMUL = false, g_isP4 = false, g_hasRDRAND = false, g_hasRDSEED = false;
+bool g_hasMMX = false, g_hasISSE = false, g_hasSSE2 = false, g_hasSSSE3 = false, g_hasSSE4 = false, g_hasAESNI = false, g_hasCLMUL = false, g_isP4 = false, g_hasRDRAND = false, g_hasRDSEED = false;
 word32 g_cacheLineSize = CRYPTOPP_L1_CACHE_LINE_SIZE;
 
 // MacPorts/GCC does not provide constructor(priority). Apple/GCC and Fink/GCC do provide it.
@@ -206,6 +206,7 @@ void DetectX86Features()
 	if ((cpuid1[3] & (1 << 26)) != 0)
 		g_hasSSE2 = TrySSE2();
 	g_hasSSSE3 = g_hasSSE2 && (cpuid1[2] & (1<<9));
+	g_hasSSE4 = g_hasSSE2 && ((cpuid1[2] & (1<<19)) || (cpuid1[2] & (1<<20)));
 	g_hasAESNI = g_hasSSE2 && (cpuid1[2] & (1<<25));
 	g_hasCLMUL = g_hasSSE2 && (cpuid1[2] & (1<<1));
 
diff --git a/cpu.h b/cpu.h
index 36d26dd2..ff3e39d4 100644
--- a/cpu.h
+++ b/cpu.h
@@ -118,6 +118,7 @@ extern CRYPTOPP_DLL bool g_hasMMX;
 extern CRYPTOPP_DLL bool g_hasISSE;
 extern CRYPTOPP_DLL bool g_hasSSE2;
 extern CRYPTOPP_DLL bool g_hasSSSE3;
+extern CRYPTOPP_DLL bool g_hasSSE4;
 extern CRYPTOPP_DLL bool g_hasAESNI;
 extern CRYPTOPP_DLL bool g_hasCLMUL;
 extern CRYPTOPP_DLL bool g_isP4;
@@ -168,6 +169,13 @@ inline bool HasSSSE3()
 	return g_hasSSSE3;
 }
 
+inline bool HasSSE4()
+{
+	if (!g_x86DetectionDone)
+		DetectX86Features();
+	return g_hasSSE4;
+}
+
 inline bool HasAESNI()
 {
 	if (!g_x86DetectionDone)
diff --git a/validat1.cpp b/validat1.cpp
index 345281dd..0e83635f 100644
--- a/validat1.cpp
+++ b/validat1.cpp
@@ -279,6 +279,7 @@ bool TestSettings()
 	bool hasISSE = HasISSE();
 	bool hasSSE2 = HasSSE2();
 	bool hasSSSE3 = HasSSSE3();
+	bool hasSSE4 = HasSSE4();
 	bool isP4 = IsP4();
 	int cacheLineSize = GetCacheLineSize();
 
@@ -290,7 +291,7 @@ bool TestSettings()
 	else
 		cout << "passed:  ";
 
-	cout << "hasMMX == " << hasMMX << ", hasISSE == " << hasISSE << ", hasSSE2 == " << hasSSE2 << ", hasSSSE3 == " << hasSSSE3 << ", hasAESNI == " << HasAESNI() << ", hasRDRAND == " << HasRDRAND() << ", hasRDSEED == " << HasRDSEED() << ", hasCLMUL == " << HasCLMUL() << ", isP4 == " << isP4 << ", cacheLineSize == " << cacheLineSize;
+	cout << "hasMMX == " << hasMMX << ", hasISSE == " << hasISSE << ", hasSSE2 == " << hasSSE2 << ", hasSSSE3 == " << hasSSE4 << ", hasSSE4 == " << hasSSSE3 << ", hasAESNI == " << HasAESNI() << ", hasRDRAND == " << HasRDRAND() << ", hasRDSEED == " << HasRDSEED() << ", hasCLMUL == " << HasCLMUL() << ", isP4 == " << isP4 << ", cacheLineSize == " << cacheLineSize;
 	cout << ", AESNI_INTRINSICS == " << CRYPTOPP_BOOL_AESNI_INTRINSICS_AVAILABLE << endl;
 #endif