vppinfra: AES-CBC and AES-GCM refactor and optimizations

- crypto code moved to vppinfra for better testing and reuse
- added 256-bit VAES support (Intel Client CPUs)
- added AES_GMAC functions

Change-Id: I960c8e14ca0a0126703e8f1589d86f32e2a98361
Type: improvement
Signed-off-by: Damjan Marion <damarion@cisco.com>

1 files changed, 439 insertions, 0 deletions

diff --git a/src/vppinfra/crypto/aes.h b/src/vppinfra/crypto/aes.h
new file mode 100644
index 00000000000..a5e286e4c6e
--- /dev/null
+++ b/src/vppinfra/crypto/aes.h
@@ -0,0 +1,439 @@
+/*
+ *------------------------------------------------------------------
+ * Copyright (c) 2020 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.
+ *------------------------------------------------------------------
+ */
+
+#ifndef __aesni_h__
+#define __aesni_h__
+
+typedef enum
+{
+  AES_KEY_128 = 0,
+  AES_KEY_192 = 1,
+  AES_KEY_256 = 2,
+} aes_key_size_t;
+
+#define AES_KEY_ROUNDS(x)		(10 + x * 2)
+#define AES_KEY_BYTES(x)		(16 + x * 8)
+
+static_always_inline u8x16
+aes_block_load (u8 * p)
+{
+  return *(u8x16u *) p;
+}
+
+static_always_inline u8x16
+aes_enc_round (u8x16 a, u8x16 k)
+{
+#if defined (__AES__)
+  return (u8x16) _mm_aesenc_si128 ((__m128i) a, (__m128i) k);
+#elif defined (__ARM_FEATURE_CRYPTO)
+  return vaesmcq_u8 (vaeseq_u8 (a, u8x16_splat (0))) ^ k;
+#endif
+}
+
+#if defined(__VAES__) && defined(__AVX512F__)
+static_always_inline u8x64
+aes_enc_round_x4 (u8x64 a, u8x64 k)
+{
+  return (u8x64) _mm512_aesenc_epi128 ((__m512i) a, (__m512i) k);
+}
+
+static_always_inline u8x64
+aes_enc_last_round_x4 (u8x64 a, u8x64 k)
+{
+  return (u8x64) _mm512_aesenclast_epi128 ((__m512i) a, (__m512i) k);
+}
+
+static_always_inline u8x64
+aes_dec_round_x4 (u8x64 a, u8x64 k)
+{
+  return (u8x64) _mm512_aesdec_epi128 ((__m512i) a, (__m512i) k);
+}
+
+static_always_inline u8x64
+aes_dec_last_round_x4 (u8x64 a, u8x64 k)
+{
+  return (u8x64) _mm512_aesdeclast_epi128 ((__m512i) a, (__m512i) k);
+}
+#endif
+
+#ifdef __VAES__
+static_always_inline u8x32
+aes_enc_round_x2 (u8x32 a, u8x32 k)
+{
+  return (u8x32) _mm256_aesenc_epi128 ((__m256i) a, (__m256i) k);
+}
+
+static_always_inline u8x32
+aes_enc_last_round_x2 (u8x32 a, u8x32 k)
+{
+  return (u8x32) _mm256_aesenclast_epi128 ((__m256i) a, (__m256i) k);
+}
+
+static_always_inline u8x32
+aes_dec_round_x2 (u8x32 a, u8x32 k)
+{
+  return (u8x32) _mm256_aesdec_epi128 ((__m256i) a, (__m256i) k);
+}
+
+static_always_inline u8x32
+aes_dec_last_round_x2 (u8x32 a, u8x32 k)
+{
+  return (u8x32) _mm256_aesdeclast_epi128 ((__m256i) a, (__m256i) k);
+}
+#endif
+
+static_always_inline u8x16
+aes_enc_last_round (u8x16 a, u8x16 k)
+{
+#if defined (__AES__)
+  return (u8x16) _mm_aesenclast_si128 ((__m128i) a, (__m128i) k);
+#elif defined (__ARM_FEATURE_CRYPTO)
+  return vaeseq_u8 (a, u8x16_splat (0)) ^ k;
+#endif
+}
+
+#ifdef __x86_64__
+
+static_always_inline u8x16
+aes_dec_round (u8x16 a, u8x16 k)
+{
+  return (u8x16) _mm_aesdec_si128 ((__m128i) a, (__m128i) k);
+}
+
+static_always_inline u8x16
+aes_dec_last_round (u8x16 a, u8x16 k)
+{
+  return (u8x16) _mm_aesdeclast_si128 ((__m128i) a, (__m128i) k);
+}
+#endif
+
+static_always_inline void
+aes_block_store (u8 * p, u8x16 r)
+{
+  *(u8x16u *) p = r;
+}
+
+static_always_inline u8x16
+aes_encrypt_block (u8x16 block, const u8x16 * round_keys, aes_key_size_t ks)
+{
+  int rounds = AES_KEY_ROUNDS (ks);
+  block ^= round_keys[0];
+  for (int i = 1; i < rounds; i += 1)
+    block = aes_enc_round (block, round_keys[i]);
+  return aes_enc_last_round (block, round_keys[rounds]);
+}
+
+static_always_inline u8x16
+aes_inv_mix_column (u8x16 a)
+{
+#if defined (__AES__)
+  return (u8x16) _mm_aesimc_si128 ((__m128i) a);
+#elif defined (__ARM_FEATURE_CRYPTO)
+  return vaesimcq_u8 (a);
+#endif
+}
+
+#ifdef __x86_64__
+#define aes_keygen_assist(a, b) \
+  (u8x16) _mm_aeskeygenassist_si128((__m128i) a, b)
+
+/* AES-NI based AES key expansion based on code samples from
+   Intel(r) Advanced Encryption Standard (AES) New Instructions White Paper
+   (323641-001) */
+
+static_always_inline void
+aes128_key_assist (u8x16 * rk, u8x16 r)
+{
+  u8x16 t = rk[-1];
+  t ^= u8x16_word_shift_left (t, 4);
+  t ^= u8x16_word_shift_left (t, 4);
+  t ^= u8x16_word_shift_left (t, 4);
+  rk[0] = t ^ (u8x16) u32x4_shuffle ((u32x4) r, 3, 3, 3, 3);
+}
+
+static_always_inline void
+aes128_key_expand (u8x16 *rk, u8x16u const *k)
+{
+  rk[0] = k[0];
+  aes128_key_assist (rk + 1, aes_keygen_assist (rk[0], 0x01));
+  aes128_key_assist (rk + 2, aes_keygen_assist (rk[1], 0x02));
+  aes128_key_assist (rk + 3, aes_keygen_assist (rk[2], 0x04));
+  aes128_key_assist (rk + 4, aes_keygen_assist (rk[3], 0x08));
+  aes128_key_assist (rk + 5, aes_keygen_assist (rk[4], 0x10));
+  aes128_key_assist (rk + 6, aes_keygen_assist (rk[5], 0x20));
+  aes128_key_assist (rk + 7, aes_keygen_assist (rk[6], 0x40));
+  aes128_key_assist (rk + 8, aes_keygen_assist (rk[7], 0x80));
+  aes128_key_assist (rk + 9, aes_keygen_assist (rk[8], 0x1b));
+  aes128_key_assist (rk + 10, aes_keygen_assist (rk[9], 0x36));
+}
+
+static_always_inline void
+aes192_key_assist (u8x16 * r1, u8x16 * r2, u8x16 key_assist)
+{
+  u8x16 t;
+  r1[0] ^= t = u8x16_word_shift_left (r1[0], 4);
+  r1[0] ^= t = u8x16_word_shift_left (t, 4);
+  r1[0] ^= u8x16_word_shift_left (t, 4);
+  r1[0] ^= (u8x16) _mm_shuffle_epi32 ((__m128i) key_assist, 0x55);
+  r2[0] ^= u8x16_word_shift_left (r2[0], 4);
+  r2[0] ^= (u8x16) _mm_shuffle_epi32 ((__m128i) r1[0], 0xff);
+}
+
+static_always_inline void
+aes192_key_expand (u8x16 * rk, u8x16u const *k)
+{
+  u8x16 r1, r2;
+
+  rk[0] = r1 = k[0];
+  /* *INDENT-OFF* */
+  rk[1] = r2 = (u8x16) (u64x2) { *(u64 *) (k + 1), 0 };
+  /* *INDENT-ON* */
+
+  aes192_key_assist (&r1, &r2, aes_keygen_assist (r2, 0x1));
+  rk[1] = (u8x16) _mm_shuffle_pd ((__m128d) rk[1], (__m128d) r1, 0);
+  rk[2] = (u8x16) _mm_shuffle_pd ((__m128d) r1, (__m128d) r2, 1);
+
+  aes192_key_assist (&r1, &r2, aes_keygen_assist (r2, 0x2));
+  rk[3] = r1;
+  rk[4] = r2;
+
+  aes192_key_assist (&r1, &r2, aes_keygen_assist (r2, 0x4));
+  rk[4] = (u8x16) _mm_shuffle_pd ((__m128d) rk[4], (__m128d) r1, 0);
+  rk[5] = (u8x16) _mm_shuffle_pd ((__m128d) r1, (__m128d) r2, 1);
+
+  aes192_key_assist (&r1, &r2, aes_keygen_assist (r2, 0x8));
+  rk[6] = r1;
+  rk[7] = r2;
+
+  aes192_key_assist (&r1, &r2, aes_keygen_assist (r2, 0x10));
+  rk[7] = (u8x16) _mm_shuffle_pd ((__m128d) rk[7], (__m128d) r1, 0);
+  rk[8] = (u8x16) _mm_shuffle_pd ((__m128d) r1, (__m128d) r2, 1);
+
+  aes192_key_assist (&r1, &r2, aes_keygen_assist (r2, 0x20));
+  rk[9] = r1;
+  rk[10] = r2;
+
+  aes192_key_assist (&r1, &r2, aes_keygen_assist (r2, 0x40));
+  rk[10] = (u8x16) _mm_shuffle_pd ((__m128d) rk[10], (__m128d) r1, 0);
+  rk[11] = (u8x16) _mm_shuffle_pd ((__m128d) r1, (__m128d) r2, 1);
+
+  aes192_key_assist (&r1, &r2, aes_keygen_assist (r2, 0x80));
+  rk[12] = r1;
+}
+
+static_always_inline void
+aes256_key_assist (u8x16 * rk, int i, u8x16 key_assist)
+{
+  u8x16 r, t;
+  rk += i;
+  r = rk[-2];
+  r ^= t = u8x16_word_shift_left (r, 4);
+  r ^= t = u8x16_word_shift_left (t, 4);
+  r ^= u8x16_word_shift_left (t, 4);
+  r ^= (u8x16) u32x4_shuffle ((u32x4) key_assist, 3, 3, 3, 3);
+  rk[0] = r;
+
+  if (i >= 14)
+    return;
+
+  key_assist = aes_keygen_assist (rk[0], 0x0);
+  r = rk[-1];
+  r ^= t = u8x16_word_shift_left (r, 4);
+  r ^= t = u8x16_word_shift_left (t, 4);
+  r ^= u8x16_word_shift_left (t, 4);
+  r ^= (u8x16) u32x4_shuffle ((u32x4) key_assist, 2, 2, 2, 2);
+  rk[1] = r;
+}
+
+static_always_inline void
+aes256_key_expand (u8x16 * rk, u8x16u const *k)
+{
+  rk[0] = k[0];
+  rk[1] = k[1];
+  aes256_key_assist (rk, 2, aes_keygen_assist (rk[1], 0x01));
+  aes256_key_assist (rk, 4, aes_keygen_assist (rk[3], 0x02));
+  aes256_key_assist (rk, 6, aes_keygen_assist (rk[5], 0x04));
+  aes256_key_assist (rk, 8, aes_keygen_assist (rk[7], 0x08));
+  aes256_key_assist (rk, 10, aes_keygen_assist (rk[9], 0x10));
+  aes256_key_assist (rk, 12, aes_keygen_assist (rk[11], 0x20));
+  aes256_key_assist (rk, 14, aes_keygen_assist (rk[13], 0x40));
+}
+#endif
+
+#ifdef __aarch64__
+
+static const u8x16 aese_prep_mask1 =
+  { 13, 14, 15, 12, 13, 14, 15, 12, 13, 14, 15, 12, 13, 14, 15, 12 };
+static const u8x16 aese_prep_mask2 =
+  { 12, 13, 14, 15, 12, 13, 14, 15, 12, 13, 14, 15, 12, 13, 14, 15 };
+
+static_always_inline void
+aes128_key_expand_round_neon (u8x16 * rk, u32 rcon)
+{
+  u8x16 r, t, last_round = rk[-1], z = { };
+  r = vqtbl1q_u8 (last_round, aese_prep_mask1);
+  r = vaeseq_u8 (r, z);
+  r ^= (u8x16) vdupq_n_u32 (rcon);
+  r ^= last_round;
+  r ^= t = vextq_u8 (z, last_round, 12);
+  r ^= t = vextq_u8 (z, t, 12);
+  r ^= vextq_u8 (z, t, 12);
+  rk[0] = r;
+}
+
+static_always_inline void
+aes128_key_expand (u8x16 *rk, u8x16u const *k)
+{
+  rk[0] = k[0];
+  aes128_key_expand_round_neon (rk + 1, 0x01);
+  aes128_key_expand_round_neon (rk + 2, 0x02);
+  aes128_key_expand_round_neon (rk + 3, 0x04);
+  aes128_key_expand_round_neon (rk + 4, 0x08);
+  aes128_key_expand_round_neon (rk + 5, 0x10);
+  aes128_key_expand_round_neon (rk + 6, 0x20);
+  aes128_key_expand_round_neon (rk + 7, 0x40);
+  aes128_key_expand_round_neon (rk + 8, 0x80);
+  aes128_key_expand_round_neon (rk + 9, 0x1b);
+  aes128_key_expand_round_neon (rk + 10, 0x36);
+}
+
+static_always_inline void
+aes192_key_expand_round_neon (u8x8 * rk, u32 rcon)
+{
+  u8x8 r, last_round = rk[-1], z = { };
+  u8x16 r2, z2 = { };
+
+  r2 = (u8x16) vdupq_lane_u64 ((uint64x1_t) last_round, 0);
+  r2 = vqtbl1q_u8 (r2, aese_prep_mask1);
+  r2 = vaeseq_u8 (r2, z2);
+  r2 ^= (u8x16) vdupq_n_u32 (rcon);
+
+  r = (u8x8) vdup_laneq_u64 ((u64x2) r2, 0);
+  r ^= rk[-3];
+  r ^= vext_u8 (z, rk[-3], 4);
+  rk[0] = r;
+
+  r = rk[-2] ^ vext_u8 (r, z, 4);
+  r ^= vext_u8 (z, r, 4);
+  rk[1] = r;
+
+  if (rcon == 0x80)
+    return;
+
+  r = rk[-1] ^ vext_u8 (r, z, 4);
+  r ^= vext_u8 (z, r, 4);
+  rk[2] = r;
+}
+
+static_always_inline void
+aes192_key_expand (u8x16 * ek, const u8x16u * k)
+{
+  u8x8 *rk = (u8x8 *) ek;
+  ek[0] = k[0];
+  rk[2] = *(u8x8u *) (k + 1);
+  aes192_key_expand_round_neon (rk + 3, 0x01);
+  aes192_key_expand_round_neon (rk + 6, 0x02);
+  aes192_key_expand_round_neon (rk + 9, 0x04);
+  aes192_key_expand_round_neon (rk + 12, 0x08);
+  aes192_key_expand_round_neon (rk + 15, 0x10);
+  aes192_key_expand_round_neon (rk + 18, 0x20);
+  aes192_key_expand_round_neon (rk + 21, 0x40);
+  aes192_key_expand_round_neon (rk + 24, 0x80);
+}
+
+
+static_always_inline void
+aes256_key_expand_round_neon (u8x16 * rk, u32 rcon)
+{
+  u8x16 r, t, z = { };
+
+  r = vqtbl1q_u8 (rk[-1], rcon ? aese_prep_mask1 : aese_prep_mask2);
+  r = vaeseq_u8 (r, z);
+  if (rcon)
+    r ^= (u8x16) vdupq_n_u32 (rcon);
+  r ^= rk[-2];
+  r ^= t = vextq_u8 (z, rk[-2], 12);
+  r ^= t = vextq_u8 (z, t, 12);
+  r ^= vextq_u8 (z, t, 12);
+  rk[0] = r;
+}
+
+static_always_inline void
+aes256_key_expand (u8x16 *rk, u8x16u const *k)
+{
+  rk[0] = k[0];
+  rk[1] = k[1];
+  aes256_key_expand_round_neon (rk + 2, 0x01);
+  aes256_key_expand_round_neon (rk + 3, 0);
+  aes256_key_expand_round_neon (rk + 4, 0x02);
+  aes256_key_expand_round_neon (rk + 5, 0);
+  aes256_key_expand_round_neon (rk + 6, 0x04);
+  aes256_key_expand_round_neon (rk + 7, 0);
+  aes256_key_expand_round_neon (rk + 8, 0x08);
+  aes256_key_expand_round_neon (rk + 9, 0);
+  aes256_key_expand_round_neon (rk + 10, 0x10);
+  aes256_key_expand_round_neon (rk + 11, 0);
+  aes256_key_expand_round_neon (rk + 12, 0x20);
+  aes256_key_expand_round_neon (rk + 13, 0);
+  aes256_key_expand_round_neon (rk + 14, 0x40);
+}
+
+#endif
+
+static_always_inline void
+aes_key_expand (u8x16 * key_schedule, u8 const *key, aes_key_size_t ks)
+{
+  switch (ks)
+    {
+    case AES_KEY_128:
+      aes128_key_expand (key_schedule, (u8x16u const *) key);
+      break;
+    case AES_KEY_192:
+      aes192_key_expand (key_schedule, (u8x16u const *) key);
+      break;
+    case AES_KEY_256:
+      aes256_key_expand (key_schedule, (u8x16u const *) key);
+      break;
+    }
+}
+
+static_always_inline void
+aes_key_enc_to_dec (u8x16 * ke, u8x16 * kd, aes_key_size_t ks)
+{
+  int rounds = AES_KEY_ROUNDS (ks);
+
+  kd[rounds] = ke[0];
+  kd[0] = ke[rounds];
+
+  for (int i = 1; i < (rounds / 2); i++)
+    {
+      kd[rounds - i] = aes_inv_mix_column (ke[i]);
+      kd[i] = aes_inv_mix_column (ke[rounds - i]);
+    }
+
+  kd[rounds / 2] = aes_inv_mix_column (ke[rounds / 2]);
+}
+
+#endif /* __aesni_h__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */