X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fplugins%2Fcrypto_native%2Fghash.h;h=f389d11cfe7032654cea0ee738f1cb067e35d9d4;hb=37665ea1c11ea13e681e37da669ea3581a84252d;hp=a2886a468e920844fa2b77d82c770462c8284b28;hpb=f75defa7676759fa81ae75e7edd492572c6b8fd6;p=vpp.git

diff --git a/src/plugins/crypto_native/ghash.h b/src/plugins/crypto_native/ghash.h
index a2886a468e9..f389d11cfe7 100644
--- a/src/plugins/crypto_native/ghash.h
+++ b/src/plugins/crypto_native/ghash.h
@@ -257,8 +257,134 @@ ghash_mul (u8x16 a, u8x16 b)
   return ghash_final (gd);
 }
 
+#ifdef __VPCLMULQDQ__
+
+static const u8x64 ghash4_poly2 = {
+  0x00, 0x00, 0x00, 0xc2, 0x01, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc2,
+  0x00, 0x00, 0x00, 0xc2, 0x01, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc2,
+  0x00, 0x00, 0x00, 0xc2, 0x01, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc2,
+  0x00, 0x00, 0x00, 0xc2, 0x01, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc2,
+};
+
+typedef struct
+{
+  u8x64 hi, lo, mid, tmp_lo, tmp_hi;
+  int pending;
+} ghash4_data_t;
+
+static_always_inline u8x64
+gmul4_lo_lo (u8x64 a, u8x64 b)
+{
+  return (u8x64) _mm512_clmulepi64_epi128 ((__m512i) a, (__m512i) b, 0x00);
+}
+
+static_always_inline u8x64
+gmul4_hi_lo (u8x64 a, u8x64 b)
+{
+  return (u8x64) _mm512_clmulepi64_epi128 ((__m512i) a, (__m512i) b, 0x01);
+}
+
+static_always_inline u8x64
+gmul4_lo_hi (u8x64 a, u8x64 b)
+{
+  return (u8x64) _mm512_clmulepi64_epi128 ((__m512i) a, (__m512i) b, 0x10);
+}
+
+static_always_inline u8x64
+gmul4_hi_hi (u8x64 a, u8x64 b)
+{
+  return (u8x64) _mm512_clmulepi64_epi128 ((__m512i) a, (__m512i) b, 0x11);
+}
+
+
+static_always_inline void
+ghash4_mul_first (ghash4_data_t * gd, u8x64 a, u8x64 b)
+{
+  gd->hi = gmul4_hi_hi (a, b);
+  gd->lo = gmul4_lo_lo (a, b);
+  gd->mid = (gmul4_hi_lo (a, b) ^ gmul4_lo_hi (a, b));
+  gd->pending = 0;
+}
+
+static_always_inline void
+ghash4_mul_next (ghash4_data_t * gd, u8x64 a, u8x64 b)
+{
+  u8x64 hi = gmul4_hi_hi (a, b);
+  u8x64 lo = gmul4_lo_lo (a, b);
+
+  if (gd->pending)
+    {
+      /* there is peding data from previous invocation so we can XOR */
+      gd->hi = u8x64_xor3 (gd->hi, gd->tmp_hi, hi);
+      gd->lo = u8x64_xor3 (gd->lo, gd->tmp_lo, lo);
+      gd->pending = 0;
+    }
+  else
+    {
+      /* there is no peding data from previous invocation so we postpone XOR */
+      gd->tmp_hi = hi;
+      gd->tmp_lo = lo;
+      gd->pending = 1;
+    }
+  gd->mid = u8x64_xor3 (gd->mid, gmul4_hi_lo (a, b), gmul4_lo_hi (a, b));
+}
+
+static_always_inline void
+ghash4_reduce (ghash4_data_t * gd)
+{
+  u8x64 r;
+
+  /* Final combination:
+     gd->lo ^= gd->mid << 64
+     gd->hi ^= gd->mid >> 64 */
+
+  u8x64 midl = u8x64_word_shift_left (gd->mid, 8);
+  u8x64 midr = u8x64_word_shift_right (gd->mid, 8);
+
+  if (gd->pending)
+    {
+      gd->lo = u8x64_xor3 (gd->lo, gd->tmp_lo, midl);
+      gd->hi = u8x64_xor3 (gd->hi, gd->tmp_hi, midr);
+    }
+  else
+    {
+      gd->lo ^= midl;
+      gd->hi ^= midr;
+    }
+
+  r = gmul4_hi_lo (ghash4_poly2, gd->lo);
+  gd->lo ^= u8x64_word_shift_left (r, 8);
+
+}
+
+static_always_inline void
+ghash4_reduce2 (ghash4_data_t * gd)
+{
+  gd->tmp_lo = gmul4_lo_lo (ghash4_poly2, gd->lo);
+  gd->tmp_hi = gmul4_lo_hi (ghash4_poly2, gd->lo);
+}
+
+static_always_inline u8x16
+ghash4_final (ghash4_data_t * gd)
+{
+  u8x64 r;
+  u8x32 t;
+
+  r = u8x64_xor3 (gd->hi, u8x64_word_shift_right (gd->tmp_lo, 4),
+		  u8x64_word_shift_left (gd->tmp_hi, 4));
+
+  /* horizontal XOR of 4 128-bit lanes */
+  t = u8x64_extract_lo (r) ^ u8x64_extract_hi (r);
+  return u8x32_extract_hi (t) ^ u8x32_extract_lo (t);
+}
+#endif
+
 static_always_inline void
-ghash_precompute (u8x16 H, u8x16 * Hi, int count)
+ghash_precompute (u8x16 H, u8x16 * Hi, int n)
 {
   u8x16 r8;
   u32x4 r32;
@@ -275,11 +401,11 @@ ghash_precompute (u8x16 H, u8x16 * Hi, int count)
   /* *INDENT-OFF* */
   r32 = r32 == (u32x4) {1, 0, 0, 1};
   /* *INDENT-ON* */
-  Hi[0] = H ^ ((u8x16) r32 & ghash_poly);
+  Hi[n - 1] = H = H ^ ((u8x16) r32 & ghash_poly);
 
   /* calculate H^(i + 1) */
-  for (int i = 1; i < count; i++)
-    Hi[i] = ghash_mul (Hi[0], Hi[i - 1]);
+  for (int i = n - 2; i >= 0; i--)
+    Hi[i] = ghash_mul (H, Hi[i + 1]);
 }
 
 #endif /* __ghash_h__ */