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diff --git a/Modules/_blake2/impl/blake2s-round.h b/Modules/_blake2/impl/blake2s-round.h
new file mode 100644
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+++ b/Modules/_blake2/impl/blake2s-round.h
@@ -0,0 +1,90 @@
+/*
+   BLAKE2 reference source code package - optimized C implementations
+  
+   Copyright 2012, Samuel Neves <sneves@dei.uc.pt>.  You may use this under the
+   terms of the CC0, the OpenSSL Licence, or the Apache Public License 2.0, at
+   your option.  The terms of these licenses can be found at:
+  
+   - CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
+   - OpenSSL license   : https://www.openssl.org/source/license.html
+   - Apache 2.0        : http://www.apache.org/licenses/LICENSE-2.0
+  
+   More information about the BLAKE2 hash function can be found at
+   https://blake2.net.
+*/
+#pragma once
+#ifndef __BLAKE2S_ROUND_H__
+#define __BLAKE2S_ROUND_H__
+
+#define LOADU(p)  _mm_loadu_si128( (const __m128i *)(p) )
+#define STOREU(p,r) _mm_storeu_si128((__m128i *)(p), r)
+
+#define TOF(reg) _mm_castsi128_ps((reg))
+#define TOI(reg) _mm_castps_si128((reg))
+
+#define LIKELY(x) __builtin_expect((x),1)
+
+
+/* Microarchitecture-specific macros */
+#ifndef HAVE_XOP
+#ifdef HAVE_SSSE3
+#define _mm_roti_epi32(r, c) ( \
+                (8==-(c)) ? _mm_shuffle_epi8(r,r8) \
+              : (16==-(c)) ? _mm_shuffle_epi8(r,r16) \
+              : _mm_xor_si128(_mm_srli_epi32( (r), -(c) ),_mm_slli_epi32( (r), 32-(-(c)) )) )
+#else
+#define _mm_roti_epi32(r, c) _mm_xor_si128(_mm_srli_epi32( (r), -(c) ),_mm_slli_epi32( (r), 32-(-(c)) ))
+#endif
+#else
+/* ... */
+#endif
+
+
+#define G1(row1,row2,row3,row4,buf) \
+  row1 = _mm_add_epi32( _mm_add_epi32( row1, buf), row2 ); \
+  row4 = _mm_xor_si128( row4, row1 ); \
+  row4 = _mm_roti_epi32(row4, -16); \
+  row3 = _mm_add_epi32( row3, row4 );   \
+  row2 = _mm_xor_si128( row2, row3 ); \
+  row2 = _mm_roti_epi32(row2, -12);
+
+#define G2(row1,row2,row3,row4,buf) \
+  row1 = _mm_add_epi32( _mm_add_epi32( row1, buf), row2 ); \
+  row4 = _mm_xor_si128( row4, row1 ); \
+  row4 = _mm_roti_epi32(row4, -8); \
+  row3 = _mm_add_epi32( row3, row4 );   \
+  row2 = _mm_xor_si128( row2, row3 ); \
+  row2 = _mm_roti_epi32(row2, -7);
+
+#define DIAGONALIZE(row1,row2,row3,row4) \
+  row4 = _mm_shuffle_epi32( row4, _MM_SHUFFLE(2,1,0,3) ); \
+  row3 = _mm_shuffle_epi32( row3, _MM_SHUFFLE(1,0,3,2) ); \
+  row2 = _mm_shuffle_epi32( row2, _MM_SHUFFLE(0,3,2,1) );
+
+#define UNDIAGONALIZE(row1,row2,row3,row4) \
+  row4 = _mm_shuffle_epi32( row4, _MM_SHUFFLE(0,3,2,1) ); \
+  row3 = _mm_shuffle_epi32( row3, _MM_SHUFFLE(1,0,3,2) ); \
+  row2 = _mm_shuffle_epi32( row2, _MM_SHUFFLE(2,1,0,3) );
+
+#if defined(HAVE_XOP)
+#include "blake2s-load-xop.h"
+#elif defined(HAVE_SSE41)
+#include "blake2s-load-sse41.h"
+#else
+#include "blake2s-load-sse2.h"
+#endif
+
+#define ROUND(r)  \
+  LOAD_MSG_ ##r ##_1(buf1); \
+  G1(row1,row2,row3,row4,buf1); \
+  LOAD_MSG_ ##r ##_2(buf2); \
+  G2(row1,row2,row3,row4,buf2); \
+  DIAGONALIZE(row1,row2,row3,row4); \
+  LOAD_MSG_ ##r ##_3(buf3); \
+  G1(row1,row2,row3,row4,buf3); \
+  LOAD_MSG_ ##r ##_4(buf4); \
+  G2(row1,row2,row3,row4,buf4); \
+  UNDIAGONALIZE(row1,row2,row3,row4); \
+ 
+#endif
+