crypto_ia32: native AES-GCM implementation

Change-Id: I006a150577e897731649f21908b4789e2eb485c3
Signed-off-by: Damjan Marion <damarion@cisco.com>

1 files changed, 776 insertions, 0 deletions

diff --git a/src/plugins/crypto_ia32/aes_gcm.c b/src/plugins/crypto_ia32/aes_gcm.c
new file mode 100644
index 00000000000..61a04c45b24
--- /dev/null
+++ b/src/plugins/crypto_ia32/aes_gcm.c
@@ -0,0 +1,776 @@
+/*
+ *------------------------------------------------------------------
+ * Copyright (c) 2019 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *------------------------------------------------------------------
+ */
+
+#include <vlib/vlib.h>
+#include <vnet/plugin/plugin.h>
+#include <vnet/crypto/crypto.h>
+#include <x86intrin.h>
+#include <crypto_ia32/crypto_ia32.h>
+#include <crypto_ia32/aesni.h>
+#include <crypto_ia32/ghash.h>
+
+#if __GNUC__ > 4  && !__clang__ && CLIB_DEBUG == 0
+#pragma GCC optimize ("O3")
+#endif
+
+typedef struct
+{
+  /* pre-calculated hash key values */
+  const __m128i Hi[8];
+  /* extracted AES key */
+  const __m128i Ke[15];
+} aes_gcm_key_data_t;
+
+static const __m128i last_byte_one = { 0, 1ULL << 56 };
+static const __m128i zero = { 0, 0 };
+
+static const u8x16 bswap_mask = {
+  15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0
+};
+
+static const u8x16 byte_mask_scale = {
+  0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
+};
+
+static_always_inline __m128i
+aesni_gcm_bswap (__m128i x)
+{
+  return _mm_shuffle_epi8 (x, (__m128i) bswap_mask);
+}
+
+static_always_inline __m128i
+aesni_gcm_byte_mask (__m128i x, u8 n_bytes)
+{
+  u8x16 mask = u8x16_is_greater (u8x16_splat (n_bytes), byte_mask_scale);
+
+  return _mm_blendv_epi8 (zero, x, (__m128i) mask);
+}
+
+static_always_inline __m128i
+aesni_gcm_load_partial (__m128i * p, int n_bytes)
+{
+#ifdef __AVX512F__
+  return _mm_mask_loadu_epi8 (zero, (1 << n_bytes) - 1, p);
+#else
+  return aesni_gcm_byte_mask (_mm_loadu_si128 (p), n_bytes);
+#endif
+}
+
+static_always_inline void
+aesni_gcm_store_partial (void *p, __m128i r, int n_bytes)
+{
+#ifdef x__AVX512F__
+  _mm_mask_storeu_epi8 (p, (1 << n_bytes) - 1, r);
+#else
+  u8x16 mask = u8x16_is_greater (u8x16_splat (n_bytes), byte_mask_scale);
+  _mm_maskmoveu_si128 (r, (__m128i) mask, p);
+#endif
+}
+
+static_always_inline void
+aesni_gcm_load (__m128i * d, __m128i * inv, int n, int n_bytes)
+{
+  for (int i = 0; i < n - 1; i++)
+    d[i] = _mm_loadu_si128 (inv + i);
+  d[n - 1] = n_bytes ? aesni_gcm_load_partial (inv + n - 1, n_bytes) :
+    _mm_loadu_si128 (inv + n - 1);
+}
+
+static_always_inline void
+aesni_gcm_store (__m128i * d, __m128i * outv, int n, int n_bytes)
+{
+  for (int i = 0; i < n - 1; i++)
+    _mm_storeu_si128 (outv + i, d[i]);
+  if (n_bytes & 0xf)
+    aesni_gcm_store_partial (outv + n - 1, d[n - 1], n_bytes);
+  else
+    _mm_storeu_si128 (outv + n - 1, d[n - 1]);
+}
+
+static_always_inline void
+aesni_gcm_enc_first_round (__m128i * r, __m128i * Y, u32 * ctr, __m128i k,
+			   int n_blocks)
+{
+  u32 i;
+
+  if (PREDICT_TRUE ((u8) ctr[0] < (256 - n_blocks)))
+    {
+      for (i = 0; i < n_blocks; i++)
+	{
+	  Y[0] = _mm_add_epi32 (Y[0], last_byte_one);
+	  r[i] = k ^ Y[0];
+	}
+      ctr[0] += n_blocks;
+    }
+  else
+    {
+      for (i = 0; i < n_blocks; i++)
+	{
+	  Y[0] = _mm_insert_epi32 (Y[0], clib_host_to_net_u32 (++ctr[0]), 3);
+	  r[i] = k ^ Y[0];
+	}
+    }
+}
+
+static_always_inline void
+aesni_gcm_enc_round (__m128i * r, __m128i k, int n_blocks)
+{
+  for (int i = 0; i < n_blocks; i++)
+    r[i] = _mm_aesenc_si128 (r[i], k);
+}
+
+static_always_inline void
+aesni_gcm_enc_last_round (__m128i * r, __m128i * d, const __m128i * k,
+			  int rounds, int n_blocks)
+{
+
+  /* additional ronuds for AES-192 and AES-256 */
+  for (int i = 10; i < rounds; i++)
+    aesni_gcm_enc_round (r, k[i], n_blocks);
+
+  for (int i = 0; i < n_blocks; i++)
+    d[i] ^= _mm_aesenclast_si128 (r[i], k[rounds]);
+}
+
+static_always_inline __m128i
+aesni_gcm_ghash_blocks (__m128i T, aes_gcm_key_data_t * kd,
+			const __m128i * in, int n_blocks)
+{
+  ghash_data_t _gd, *gd = &_gd;
+  const __m128i *Hi = kd->Hi + n_blocks - 1;
+  ghash_mul_first (gd, aesni_gcm_bswap (_mm_loadu_si128 (in)) ^ T, Hi[0]);
+  for (int i = 1; i < n_blocks; i++)
+    ghash_mul_next (gd, aesni_gcm_bswap (_mm_loadu_si128 (in + i)), Hi[-i]);
+  ghash_reduce (gd);
+  ghash_reduce2 (gd);
+  return ghash_final (gd);
+}
+
+static_always_inline __m128i
+aesni_gcm_ghash (__m128i T, aes_gcm_key_data_t * kd, const __m128i * in,
+		 u32 n_left)
+{
+
+  while (n_left >= 128)
+    {
+      T = aesni_gcm_ghash_blocks (T, kd, in, 8);
+      n_left -= 128;
+      in += 8;
+    }
+
+  if (n_left >= 64)
+    {
+      T = aesni_gcm_ghash_blocks (T, kd, in, 4);
+      n_left -= 64;
+      in += 4;
+    }
+
+  if (n_left >= 32)
+    {
+      T = aesni_gcm_ghash_blocks (T, kd, in, 2);
+      n_left -= 32;
+      in += 2;
+    }
+
+  if (n_left >= 16)
+    {
+      T = aesni_gcm_ghash_blocks (T, kd, in, 1);
+      n_left -= 16;
+      in += 1;
+    }
+
+  if (n_left)
+    {
+      __m128i r = aesni_gcm_load_partial ((__m128i *) in, n_left);
+      T = ghash_mul (aesni_gcm_bswap (r) ^ T, kd->Hi[0]);
+    }
+  return T;
+}
+
+static_always_inline __m128i
+aesni_gcm_calc (__m128i T, aes_gcm_key_data_t * kd, __m128i * d,
+		__m128i * Y, u32 * ctr, __m128i * inv, __m128i * outv,
+		int rounds, int n, int last_block_bytes, int with_ghash,
+		int is_encrypt)
+{
+  __m128i r[n];
+  ghash_data_t _gd = { }, *gd = &_gd;
+  const __m128i *k = kd->Ke;
+  int hidx = is_encrypt ? 4 : n, didx = 0;
+
+  _mm_prefetch (inv + 4, _MM_HINT_T0);
+
+  /* AES rounds 0 and 1 */
+  aesni_gcm_enc_first_round (r, Y, ctr, k[0], n);
+  aesni_gcm_enc_round (r, k[1], n);
+
+  /* load data - decrypt round */
+  if (is_encrypt == 0)
+    aesni_gcm_load (d, inv, n, last_block_bytes);
+
+  /* GHASH multiply block 1 */
+  if (with_ghash)
+    ghash_mul_first (gd, aesni_gcm_bswap (d[didx++]) ^ T, kd->Hi[--hidx]);
+
+  /* AES rounds 2 and 3 */
+  aesni_gcm_enc_round (r, k[2], n);
+  aesni_gcm_enc_round (r, k[3], n);
+
+  /* GHASH multiply block 2 */
+  if (with_ghash && hidx)
+    ghash_mul_next (gd, aesni_gcm_bswap (d[didx++]), kd->Hi[--hidx]);
+
+  /* AES rounds 4 and 5 */
+  aesni_gcm_enc_round (r, k[4], n);
+  aesni_gcm_enc_round (r, k[5], n);
+
+  /* GHASH multiply block 3 */
+  if (with_ghash && hidx)
+    ghash_mul_next (gd, aesni_gcm_bswap (d[didx++]), kd->Hi[--hidx]);
+
+  /* AES rounds 6 and 7 */
+  aesni_gcm_enc_round (r, k[6], n);
+  aesni_gcm_enc_round (r, k[7], n);
+
+  /* GHASH multiply block 4 */
+  if (with_ghash && hidx)
+    ghash_mul_next (gd, aesni_gcm_bswap (d[didx++]), kd->Hi[--hidx]);
+
+  /* AES rounds 8 and 9 */
+  aesni_gcm_enc_round (r, k[8], n);
+  aesni_gcm_enc_round (r, k[9], n);
+
+  /* GHASH reduce 1st step */
+  if (with_ghash)
+    ghash_reduce (gd);
+
+  /* load data - encrypt round */
+  if (is_encrypt)
+    aesni_gcm_load (d, inv, n, last_block_bytes);
+
+  /* GHASH reduce 2nd step */
+  if (with_ghash)
+    ghash_reduce2 (gd);
+
+  /* AES last round(s) */
+  aesni_gcm_enc_last_round (r, d, k, rounds, n);
+
+  /* store data */
+  aesni_gcm_store (d, outv, n, last_block_bytes);
+
+  /* GHASH final step */
+  if (with_ghash)
+    T = ghash_final (gd);
+
+  return T;
+}
+
+static_always_inline __m128i
+aesni_gcm_calc_double (__m128i T, aes_gcm_key_data_t * kd, __m128i * d,
+		       __m128i * Y, u32 * ctr, __m128i * inv, __m128i * outv,
+		       int rounds, int is_encrypt)
+{
+  __m128i r[4];
+  ghash_data_t _gd, *gd = &_gd;
+  const __m128i *k = kd->Ke;
+
+  /* AES rounds 0 and 1 */
+  aesni_gcm_enc_first_round (r, Y, ctr, k[0], 4);
+  aesni_gcm_enc_round (r, k[1], 4);
+
+  /* load 4 blocks of data - decrypt round */
+  if (is_encrypt == 0)
+    aesni_gcm_load (d, inv, 4, 0);
+
+  /* GHASH multiply block 0 */
+  ghash_mul_first (gd, aesni_gcm_bswap (d[0]) ^ T, kd->Hi[7]);
+
+  /* AES rounds 2 and 3 */
+  aesni_gcm_enc_round (r, k[2], 4);
+  aesni_gcm_enc_round (r, k[3], 4);
+
+  /* GHASH multiply block 1 */
+  ghash_mul_next (gd, aesni_gcm_bswap (d[1]), kd->Hi[6]);
+
+  /* AES rounds 4 and 5 */
+  aesni_gcm_enc_round (r, k[4], 4);
+  aesni_gcm_enc_round (r, k[5], 4);
+
+  /* GHASH multiply block 2 */
+  ghash_mul_next (gd, aesni_gcm_bswap (d[2]), kd->Hi[5]);
+
+  /* AES rounds 6 and 7 */
+  aesni_gcm_enc_round (r, k[6], 4);
+  aesni_gcm_enc_round (r, k[7], 4);
+
+  /* GHASH multiply block 3 */
+  ghash_mul_next (gd, aesni_gcm_bswap (d[3]), kd->Hi[4]);
+
+  /* AES rounds 8 and 9 */
+  aesni_gcm_enc_round (r, k[8], 4);
+  aesni_gcm_enc_round (r, k[9], 4);
+
+  /* load 4 blocks of data - encrypt round */
+  if (is_encrypt)
+    aesni_gcm_load (d, inv, 4, 0);
+
+  /* AES last round(s) */
+  aesni_gcm_enc_last_round (r, d, k, rounds, 4);
+
+  /* store 4 blocks of data */
+  aesni_gcm_store (d, outv, 4, 0);
+
+  /* load next 4 blocks of data data - decrypt round */
+  if (is_encrypt == 0)
+    aesni_gcm_load (d, inv + 4, 4, 0);
+
+  /* GHASH multiply block 4 */
+  ghash_mul_next (gd, aesni_gcm_bswap (d[0]), kd->Hi[3]);
+
+  /* AES rounds 0, 1 and 2 */
+  aesni_gcm_enc_first_round (r, Y, ctr, k[0], 4);
+  aesni_gcm_enc_round (r, k[1], 4);
+  aesni_gcm_enc_round (r, k[2], 4);
+
+  /* GHASH multiply block 5 */
+  ghash_mul_next (gd, aesni_gcm_bswap (d[1]), kd->Hi[2]);
+
+  /* AES rounds 3 and 4 */
+  aesni_gcm_enc_round (r, k[3], 4);
+  aesni_gcm_enc_round (r, k[4], 4);
+
+  /* GHASH multiply block 6 */
+  ghash_mul_next (gd, aesni_gcm_bswap (d[2]), kd->Hi[1]);
+
+  /* AES rounds 5 and 6 */
+  aesni_gcm_enc_round (r, k[5], 4);
+  aesni_gcm_enc_round (r, k[6], 4);
+
+  /* GHASH multiply block 7 */
+  ghash_mul_next (gd, aesni_gcm_bswap (d[3]), kd->Hi[0]);
+
+  /* AES rounds 7 and 8 */
+  aesni_gcm_enc_round (r, k[7], 4);
+  aesni_gcm_enc_round (r, k[8], 4);
+
+  /* GHASH reduce 1st step */
+  ghash_reduce (gd);
+
+  /* AES round 9 */
+  aesni_gcm_enc_round (r, k[9], 4);
+
+  /* load data - encrypt round */
+  if (is_encrypt)
+    aesni_gcm_load (d, inv + 4, 4, 0);
+
+  /* GHASH reduce 2nd step */
+  ghash_reduce2 (gd);
+
+  /* AES last round(s) */
+  aesni_gcm_enc_last_round (r, d, k, rounds, 4);
+
+  /* store data */
+  aesni_gcm_store (d, outv + 4, 4, 0);
+
+  /* GHASH final step */
+  return ghash_final (gd);
+}
+
+static_always_inline __m128i
+aesni_gcm_ghash_last (__m128i T, aes_gcm_key_data_t * kd, __m128i * d,
+		      int n_blocks, int n_bytes)
+{
+  ghash_data_t _gd, *gd = &_gd;
+
+  if (n_bytes)
+    d[n_blocks - 1] = aesni_gcm_byte_mask (d[n_blocks - 1], n_bytes);
+
+  ghash_mul_first (gd, aesni_gcm_bswap (d[0]) ^ T, kd->Hi[n_blocks - 1]);
+  if (n_blocks > 1)
+    ghash_mul_next (gd, aesni_gcm_bswap (d[1]), kd->Hi[n_blocks - 2]);
+  if (n_blocks > 2)
+    ghash_mul_next (gd, aesni_gcm_bswap (d[2]), kd->Hi[n_blocks - 3]);
+  if (n_blocks > 3)
+    ghash_mul_next (gd, aesni_gcm_bswap (d[3]), kd->Hi[n_blocks - 4]);
+  ghash_reduce (gd);
+  ghash_reduce2 (gd);
+  return ghash_final (gd);
+}
+
+
+static_always_inline __m128i
+aesni_gcm_enc (__m128i T, aes_gcm_key_data_t * kd, __m128i Y, const u8 * in,
+	       const u8 * out, u32 n_left, int rounds)
+{
+  __m128i *inv = (__m128i *) in, *outv = (__m128i *) out;
+  __m128i d[4];
+  u32 ctr = 1;
+
+  if (n_left == 0)
+    return T;
+
+  if (n_left < 64)
+    {
+      if (n_left > 48)
+	{
+	  n_left &= 0x0f;
+	  aesni_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 4, n_left,
+			  /* with_ghash */ 0, /* is_encrypt */ 1);
+	  return aesni_gcm_ghash_last (T, kd, d, 4, n_left);
+	}
+      else if (n_left > 32)
+	{
+	  n_left &= 0x0f;
+	  aesni_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 3, n_left,
+			  /* with_ghash */ 0, /* is_encrypt */ 1);
+	  return aesni_gcm_ghash_last (T, kd, d, 3, n_left);
+	}
+      else if (n_left > 16)
+	{
+	  n_left &= 0x0f;
+	  aesni_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 2, n_left,
+			  /* with_ghash */ 0, /* is_encrypt */ 1);
+	  return aesni_gcm_ghash_last (T, kd, d, 2, n_left);
+	}
+      else
+	{
+	  n_left &= 0x0f;
+	  aesni_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 1, n_left,
+			  /* with_ghash */ 0, /* is_encrypt */ 1);
+	  return aesni_gcm_ghash_last (T, kd, d, 1, n_left);
+	}
+    }
+
+  aesni_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 4, 0,
+		  /* with_ghash */ 0, /* is_encrypt */ 1);
+
+  /* next */
+  n_left -= 64;
+  outv += 4;
+  inv += 4;
+
+  while (n_left >= 128)
+    {
+      T = aesni_gcm_calc_double (T, kd, d, &Y, &ctr, inv, outv, rounds,
+				 /* is_encrypt */ 1);
+
+      /* next */
+      n_left -= 128;
+      outv += 8;
+      inv += 8;
+    }
+
+  if (n_left >= 64)
+    {
+      T = aesni_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 4, 0,
+			  /* with_ghash */ 1, /* is_encrypt */ 1);
+
+      /* next */
+      n_left -= 64;
+      outv += 4;
+      inv += 4;
+    }
+
+  if (n_left == 0)
+    return aesni_gcm_ghash_last (T, kd, d, 4, 0);
+
+  if (n_left > 48)
+    {
+      n_left &= 0x0f;
+      T = aesni_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 4, n_left,
+			  /* with_ghash */ 1, /* is_encrypt */ 1);
+      return aesni_gcm_ghash_last (T, kd, d, 4, n_left);
+    }
+
+  if (n_left > 32)
+    {
+      n_left &= 0x0f;
+      T = aesni_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 3, n_left,
+			  /* with_ghash */ 1, /* is_encrypt */ 1);
+      return aesni_gcm_ghash_last (T, kd, d, 3, n_left);
+    }
+
+  if (n_left > 16)
+    {
+      n_left &= 0x0f;
+      T = aesni_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 2, n_left,
+			  /* with_ghash */ 1, /* is_encrypt */ 1);
+      return aesni_gcm_ghash_last (T, kd, d, 2, n_left);
+    }
+
+  n_left &= 0x0f;
+  T = aesni_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 1, n_left,
+		      /* with_ghash */ 1, /* is_encrypt */ 1);
+  return aesni_gcm_ghash_last (T, kd, d, 1, n_left);
+}
+
+static_always_inline __m128i
+aesni_gcm_dec (__m128i T, aes_gcm_key_data_t * kd, __m128i Y, const u8 * in,
+	       const u8 * out, u32 n_left, int rounds)
+{
+  __m128i *inv = (__m128i *) in, *outv = (__m128i *) out;
+  __m128i d[8];
+  u32 ctr = 1;
+
+  while (n_left >= 128)
+    {
+      T = aesni_gcm_calc_double (T, kd, d, &Y, &ctr, inv, outv, rounds,
+				 /* is_encrypt */ 0);
+
+      /* next */
+      n_left -= 128;
+      outv += 8;
+      inv += 8;
+    }
+
+  if (n_left >= 64)
+    {
+      T = aesni_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 4, 0, 1, 0);
+
+      /* next */
+      n_left -= 64;
+      outv += 4;
+      inv += 4;
+    }
+
+  if (n_left == 0)
+    return T;
+
+  if (n_left > 48)
+    return aesni_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 4,
+			   n_left - 48,
+			   /* with_ghash */ 1, /* is_encrypt */ 0);
+
+  if (n_left > 32)
+    return aesni_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 3,
+			   n_left - 32,
+			   /* with_ghash */ 1, /* is_encrypt */ 0);
+
+  if (n_left > 16)
+    return aesni_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 2,
+			   n_left - 16,
+			   /* with_ghash */ 1, /* is_encrypt */ 0);
+
+  return aesni_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 1, n_left,
+			 /* with_ghash */ 1, /* is_encrypt */ 0);
+}
+
+static_always_inline int
+aes_gcm (const u8 * in, u8 * out, const u8 * addt, const u8 * iv, u8 * tag,
+	 u32 data_bytes, u32 aad_bytes, u8 tag_len, aes_gcm_key_data_t * kd,
+	 int aes_rounds, int is_encrypt)
+{
+  int i;
+  __m128i r, Y0, T = { };
+  ghash_data_t _gd, *gd = &_gd;
+
+  _mm_prefetch (iv, _MM_HINT_T0);
+  _mm_prefetch (in, _MM_HINT_T0);
+  _mm_prefetch (in + CLIB_CACHE_LINE_BYTES, _MM_HINT_T0);
+
+  /* calculate ghash for AAD - optimized for ipsec common cases */
+  if (aad_bytes == 8)
+    T = aesni_gcm_ghash (T, kd, (__m128i *) addt, 8);
+  else if (aad_bytes == 12)
+    T = aesni_gcm_ghash (T, kd, (__m128i *) addt, 12);
+  else
+    T = aesni_gcm_ghash (T, kd, (__m128i *) addt, aad_bytes);
+
+  /* initalize counter */
+  Y0 = _mm_loadu_si128 ((__m128i *) iv);
+  Y0 = _mm_insert_epi32 (Y0, clib_host_to_net_u32 (1), 3);
+
+  /* ghash and encrypt/edcrypt  */
+  if (is_encrypt)
+    T = aesni_gcm_enc (T, kd, Y0, in, out, data_bytes, aes_rounds);
+  else
+    T = aesni_gcm_dec (T, kd, Y0, in, out, data_bytes, aes_rounds);
+
+  _mm_prefetch (tag, _MM_HINT_T0);
+
+  /* Finalize ghash */
+  r[0] = data_bytes;
+  r[1] = aad_bytes;
+
+  /* bytes to bits */
+  r <<= 3;
+
+  /* interleaved computation of final ghash and E(Y0, k) */
+  ghash_mul_first (gd, r ^ T, kd->Hi[0]);
+  r = kd->Ke[0] ^ Y0;
+  for (i = 1; i < 5; i += 1)
+    r = _mm_aesenc_si128 (r, kd->Ke[i]);
+  ghash_reduce (gd);
+  ghash_reduce2 (gd);
+  for (; i < 9; i += 1)
+    r = _mm_aesenc_si128 (r, kd->Ke[i]);
+  T = ghash_final (gd);
+  for (; i < aes_rounds; i += 1)
+    r = _mm_aesenc_si128 (r, kd->Ke[i]);
+  r = _mm_aesenclast_si128 (r, kd->Ke[aes_rounds]);
+  T = aesni_gcm_bswap (T) ^ r;
+
+  /* tag_len 16 -> 0 */
+  tag_len &= 0xf;
+
+  if (is_encrypt)
+    {
+      /* store tag */
+      if (tag_len)
+	aesni_gcm_store_partial ((__m128i *) tag, T, (1 << tag_len) - 1);
+      else
+	_mm_storeu_si128 ((__m128i *) tag, T);
+    }
+  else
+    {
+      /* check tag */
+      u16 tag_mask = tag_len ? (1 << tag_len) - 1 : 0xffff;
+      r = _mm_loadu_si128 ((__m128i *) tag);
+      if (_mm_movemask_epi8 (r == T) != tag_mask)
+	return 0;
+    }
+  return 1;
+}
+
+static_always_inline u32
+aesni_ops_enc_aes_gcm (vlib_main_t * vm, vnet_crypto_op_t * ops[],
+		       u32 n_ops, aesni_key_size_t ks)
+{
+  crypto_ia32_main_t *cm = &crypto_ia32_main;
+  vnet_crypto_op_t *op = ops[0];
+  aes_gcm_key_data_t *kd;
+  u32 n_left = n_ops;
+
+
+next:
+  kd = (aes_gcm_key_data_t *) cm->key_data[op->key_index];
+  aes_gcm (op->src, op->dst, op->aad, op->iv, op->tag, op->len, op->aad_len,
+	   op->tag_len, kd, AESNI_KEY_ROUNDS (ks), /* is_encrypt */ 1);
+  op->status = VNET_CRYPTO_OP_STATUS_COMPLETED;
+
+  if (--n_left)
+    {
+      op += 1;
+      goto next;
+    }
+
+  return n_ops;
+}
+
+static_always_inline u32
+aesni_ops_dec_aes_gcm (vlib_main_t * vm, vnet_crypto_op_t * ops[],
+		       u32 n_ops, aesni_key_size_t ks)
+{
+  crypto_ia32_main_t *cm = &crypto_ia32_main;
+  vnet_crypto_op_t *op = ops[0];
+  aes_gcm_key_data_t *kd;
+  u32 n_left = n_ops;
+  int rv;
+
+next:
+  kd = (aes_gcm_key_data_t *) cm->key_data[op->key_index];
+  rv = aes_gcm (op->src, op->dst, op->aad, op->iv, op->tag, op->len,
+		op->aad_len, op->tag_len, kd, AESNI_KEY_ROUNDS (ks),
+		/* is_encrypt */ 0);
+
+  if (rv)
+    {
+      op->status = VNET_CRYPTO_OP_STATUS_COMPLETED;
+    }
+  else
+    {
+      op->status = VNET_CRYPTO_OP_STATUS_FAIL_BAD_HMAC;
+      n_ops--;
+    }
+
+  if (--n_left)
+    {
+      op += 1;
+      goto next;
+    }
+
+  return n_ops;
+}
+
+static_always_inline void *
+aesni_gcm_key_exp (vnet_crypto_key_t * key, aesni_key_size_t ks)
+{
+  aes_gcm_key_data_t *kd;
+  __m128i H;
+  int i;
+
+  kd = clib_mem_alloc_aligned (sizeof (*kd), CLIB_CACHE_LINE_BYTES);
+
+  /* expand AES key */
+  aes_key_expand ((__m128i *) kd->Ke, key->data, ks);
+
+  /* pre-calculate H */
+  H = kd->Ke[0];
+  for (i = 1; i < AESNI_KEY_ROUNDS (ks); i += 1)
+    H = _mm_aesenc_si128 (H, kd->Ke[i]);
+  H = _mm_aesenclast_si128 (H, kd->Ke[i]);
+  H = aesni_gcm_bswap (H);
+  ghash_precompute (H, (__m128i *) kd->Hi, 8);
+  return kd;
+}
+
+#define foreach_aesni_gcm_handler_type _(128) _(192) _(256)
+
+#define _(x) \
+static u32 aesni_ops_dec_aes_gcm_##x                                         \
+(vlib_main_t * vm, vnet_crypto_op_t * ops[], u32 n_ops)                      \
+{ return aesni_ops_dec_aes_gcm (vm, ops, n_ops, AESNI_KEY_##x); }            \
+static u32 aesni_ops_enc_aes_gcm_##x                                         \
+(vlib_main_t * vm, vnet_crypto_op_t * ops[], u32 n_ops)                      \
+{ return aesni_ops_enc_aes_gcm (vm, ops, n_ops, AESNI_KEY_##x); }            \
+static void * aesni_gcm_key_exp_##x (vnet_crypto_key_t *key)                 \
+{ return aesni_gcm_key_exp (key, AESNI_KEY_##x); }
+
+foreach_aesni_gcm_handler_type;
+#undef _
+
+clib_error_t *
+#ifdef __AVX512F__
+crypto_ia32_aesni_gcm_init_avx512 (vlib_main_t * vm)
+#elif __AVX2__
+crypto_ia32_aesni_gcm_init_avx2 (vlib_main_t * vm)
+#else
+crypto_ia32_aesni_gcm_init_sse42 (vlib_main_t * vm)
+#endif
+{
+  crypto_ia32_main_t *cm = &crypto_ia32_main;
+
+#define _(x) \
+  vnet_crypto_register_ops_handler (vm, cm->crypto_engine_index, \
+				    VNET_CRYPTO_OP_AES_##x##_GCM_ENC, \
+				    aesni_ops_enc_aes_gcm_##x); \
+  vnet_crypto_register_ops_handler (vm, cm->crypto_engine_index, \
+				    VNET_CRYPTO_OP_AES_##x##_GCM_DEC, \
+				    aesni_ops_dec_aes_gcm_##x); \
+  cm->key_fn[VNET_CRYPTO_ALG_AES_##x##_GCM] = aesni_gcm_key_exp_##x;
+  foreach_aesni_gcm_handler_type;
+#undef _
+  return 0;
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */