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diff --git a/src/plugins/wireguard/wireguard_noise.h b/src/plugins/wireguard/wireguard_noise.h
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+/*
+ * Copyright (c) 2020 Doc.ai and/or its affiliates.
+ * Copyright (c) 2015-2020 Jason A. Donenfeld <Jason@zx2c4.com>.
+ * Copyright (c) 2019-2020 Matt Dunwoodie <ncon@noconroy.net>.
+ * 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 __included_wg_noise_h__
+#define __included_wg_noise_h__
+
+#include <vlib/vlib.h>
+#include <vnet/crypto/crypto.h>
+#include <wireguard/blake/blake2s.h>
+#include <wireguard/wireguard_key.h>
+
+#define NOISE_PUBLIC_KEY_LEN CURVE25519_KEY_SIZE
+#define NOISE_SYMMETRIC_KEY_LEN 32 // CHACHA20POLY1305_KEY_SIZE
+#define NOISE_TIMESTAMP_LEN (sizeof(uint64_t) + sizeof(uint32_t))
+#define NOISE_AUTHTAG_LEN 16 //CHACHA20POLY1305_AUTHTAG_SIZE
+#define NOISE_HASH_LEN BLAKE2S_HASH_SIZE
+
+/* Protocol string constants */
+#define NOISE_HANDSHAKE_NAME "Noise_IKpsk2_25519_ChaChaPoly_BLAKE2s"
+#define NOISE_IDENTIFIER_NAME "WireGuard v1 zx2c4 Jason@zx2c4.com"
+
+/* Constants for the counter */
+#define COUNTER_BITS_TOTAL 8192
+#define COUNTER_BITS (sizeof(unsigned long) * 8)
+#define COUNTER_NUM (COUNTER_BITS_TOTAL / COUNTER_BITS)
+#define COUNTER_WINDOW_SIZE (COUNTER_BITS_TOTAL - COUNTER_BITS)
+
+/* Constants for the keypair */
+#define REKEY_AFTER_MESSAGES (1ull << 60)
+#define REJECT_AFTER_MESSAGES (UINT64_MAX - COUNTER_WINDOW_SIZE - 1)
+#define REKEY_AFTER_TIME 120
+#define REKEY_AFTER_TIME_RECV 165
+#define REJECT_AFTER_TIME 180
+#define REJECT_INTERVAL (0.02) /* fifty times per sec */
+/* 24 = floor(log2(REJECT_INTERVAL)) */
+#define REJECT_INTERVAL_MASK (~((1ull<<24)-1))
+
+enum noise_state_crypt
+{
+ SC_OK = 0,
+ SC_CONN_RESET,
+ SC_KEEP_KEY_FRESH,
+ SC_FAILED,
+};
+
+enum noise_state_hs
+{
+ HS_ZEROED = 0,
+ CREATED_INITIATION,
+ CONSUMED_INITIATION,
+ CREATED_RESPONSE,
+ CONSUMED_RESPONSE,
+};
+
+typedef struct noise_handshake
+{
+ enum noise_state_hs hs_state;
+ uint32_t hs_local_index;
+ uint32_t hs_remote_index;
+ uint8_t hs_e[NOISE_PUBLIC_KEY_LEN];
+ uint8_t hs_hash[NOISE_HASH_LEN];
+ uint8_t hs_ck[NOISE_HASH_LEN];
+} noise_handshake_t;
+
+typedef struct noise_counter
+{
+ uint64_t c_send;
+ uint64_t c_recv;
+ unsigned long c_backtrack[COUNTER_NUM];
+} noise_counter_t;
+
+typedef struct noise_keypair
+{
+ int kp_valid;
+ int kp_is_initiator;
+ uint32_t kp_local_index;
+ uint32_t kp_remote_index;
+ vnet_crypto_key_index_t kp_send_index;
+ vnet_crypto_key_index_t kp_recv_index;
+ f64 kp_birthdate;
+ noise_counter_t kp_ctr;
+} noise_keypair_t;
+
+typedef struct noise_local noise_local_t;
+typedef struct noise_remote
+{
+ uint32_t r_peer_idx;
+ uint8_t r_public[NOISE_PUBLIC_KEY_LEN];
+ noise_local_t *r_local;
+ uint8_t r_ss[NOISE_PUBLIC_KEY_LEN];
+
+ noise_handshake_t r_handshake;
+ uint8_t r_psk[NOISE_SYMMETRIC_KEY_LEN];
+ uint8_t r_timestamp[NOISE_TIMESTAMP_LEN];
+ f64 r_last_init;
+
+ noise_keypair_t *r_next, *r_current, *r_previous;
+} noise_remote_t;
+
+typedef struct noise_local
+{
+ bool l_has_identity;
+ uint8_t l_public[NOISE_PUBLIC_KEY_LEN];
+ uint8_t l_private[NOISE_PUBLIC_KEY_LEN];
+
+ struct noise_upcall
+ {
+ void *u_arg;
+ noise_remote_t *(*u_remote_get) (uint8_t[NOISE_PUBLIC_KEY_LEN]);
+ uint32_t (*u_index_set) (noise_remote_t *);
+ void (*u_index_drop) (uint32_t);
+ } l_upcall;
+} noise_local_t;
+
+/* Set/Get noise parameters */
+void noise_local_init (noise_local_t *, struct noise_upcall *);
+bool noise_local_set_private (noise_local_t *,
+ const uint8_t[NOISE_PUBLIC_KEY_LEN]);
+bool noise_local_keys (noise_local_t *, uint8_t[NOISE_PUBLIC_KEY_LEN],
+ uint8_t[NOISE_PUBLIC_KEY_LEN]);
+
+void noise_remote_init (noise_remote_t *, uint32_t,
+ const uint8_t[NOISE_PUBLIC_KEY_LEN], noise_local_t *);
+bool noise_remote_set_psk (noise_remote_t *,
+ uint8_t[NOISE_SYMMETRIC_KEY_LEN]);
+bool noise_remote_keys (noise_remote_t *, uint8_t[NOISE_PUBLIC_KEY_LEN],
+ uint8_t[NOISE_SYMMETRIC_KEY_LEN]);
+
+/* Should be called anytime noise_local_set_private is called */
+void noise_remote_precompute (noise_remote_t *);
+
+/* Cryptographic functions */
+bool noise_create_initiation (vlib_main_t * vm, noise_remote_t *,
+ uint32_t * s_idx,
+ uint8_t ue[NOISE_PUBLIC_KEY_LEN],
+ uint8_t es[NOISE_PUBLIC_KEY_LEN +
+ NOISE_AUTHTAG_LEN],
+ uint8_t ets[NOISE_TIMESTAMP_LEN +
+ NOISE_AUTHTAG_LEN]);
+
+bool noise_consume_initiation (vlib_main_t * vm, noise_local_t *,
+ noise_remote_t **,
+ uint32_t s_idx,
+ uint8_t ue[NOISE_PUBLIC_KEY_LEN],
+ uint8_t es[NOISE_PUBLIC_KEY_LEN +
+ NOISE_AUTHTAG_LEN],
+ uint8_t ets[NOISE_TIMESTAMP_LEN +
+ NOISE_AUTHTAG_LEN]);
+
+bool noise_create_response (vlib_main_t * vm, noise_remote_t *,
+ uint32_t * s_idx,
+ uint32_t * r_idx,
+ uint8_t ue[NOISE_PUBLIC_KEY_LEN],
+ uint8_t en[0 + NOISE_AUTHTAG_LEN]);
+
+bool noise_consume_response (vlib_main_t * vm, noise_remote_t *,
+ uint32_t s_idx,
+ uint32_t r_idx,
+ uint8_t ue[NOISE_PUBLIC_KEY_LEN],
+ uint8_t en[0 + NOISE_AUTHTAG_LEN]);
+
+bool noise_remote_begin_session (vlib_main_t * vm, noise_remote_t * r);
+void noise_remote_clear (vlib_main_t * vm, noise_remote_t * r);
+void noise_remote_expire_current (noise_remote_t * r);
+
+bool noise_remote_ready (noise_remote_t *);
+
+enum noise_state_crypt
+noise_remote_encrypt (vlib_main_t * vm, noise_remote_t *,
+ uint32_t * r_idx,
+ uint64_t * nonce,
+ uint8_t * src, size_t srclen, uint8_t * dst);
+enum noise_state_crypt
+noise_remote_decrypt (vlib_main_t * vm, noise_remote_t *,
+ uint32_t r_idx,
+ uint64_t nonce,
+ uint8_t * src, size_t srclen, uint8_t * dst);
+
+
+#endif /* __included_wg_noise_h__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */