src/vnet/ipsec/esp.h - fdio/vpp - Gitiles

 /*
  * Copyright (c) 2015 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 __ESP_H__
 #define __ESP_H__

 #include <vnet/ip/ip.h>
 #include <vnet/ipsec/ipsec.h>

 #include <openssl/hmac.h>
 #include <openssl/rand.h>
 #include <openssl/evp.h>

 typedef struct
 {
   u32 spi;
   u32 seq;
   u8 data[0];
 } esp_header_t;

 typedef struct
 {
   u8 pad_length;
   u8 next_header;
 } esp_footer_t;

 /* *INDENT-OFF* */
 typedef CLIB_PACKED (struct {
   ip4_header_t ip4;
   esp_header_t esp;
 }) ip4_and_esp_header_t;
 /* *INDENT-ON* */

 /* *INDENT-OFF* */
 typedef CLIB_PACKED (struct {
   ip6_header_t ip6;
   esp_header_t esp;
 }) ip6_and_esp_header_t;
 /* *INDENT-ON* */

 typedef struct
 {
   const EVP_CIPHER *type;
   u8 iv_size;
   u8 block_size;
 } ipsec_proto_main_crypto_alg_t;

 typedef struct
 {
   const EVP_MD *md;
   u8 trunc_size;
 } ipsec_proto_main_integ_alg_t;

 typedef struct
 {
   CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
   EVP_CIPHER_CTX *encrypt_ctx;
 #else
   EVP_CIPHER_CTX encrypt_ctx;
 #endif
     CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
   EVP_CIPHER_CTX *decrypt_ctx;
 #else
   EVP_CIPHER_CTX decrypt_ctx;
 #endif
     CLIB_CACHE_LINE_ALIGN_MARK (cacheline2);
 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
   HMAC_CTX *hmac_ctx;
 #else
   HMAC_CTX hmac_ctx;
 #endif
   ipsec_crypto_alg_t last_encrypt_alg;
   ipsec_crypto_alg_t last_decrypt_alg;
   ipsec_integ_alg_t last_integ_alg;
 } ipsec_proto_main_per_thread_data_t;

 typedef struct
 {
   ipsec_proto_main_crypto_alg_t *ipsec_proto_main_crypto_algs;
   ipsec_proto_main_integ_alg_t *ipsec_proto_main_integ_algs;
   ipsec_proto_main_per_thread_data_t *per_thread_data;
 } ipsec_proto_main_t;

 extern ipsec_proto_main_t ipsec_proto_main;

 #define ESP_WINDOW_SIZE		(64)
 #define ESP_SEQ_MAX 		(4294967295UL)

 u8 *format_esp_header (u8 * s, va_list * args);

 always_inline int
 esp_replay_check (ipsec_sa_t * sa, u32 seq)
 {
   u32 diff;

   if (PREDICT_TRUE (seq > sa->last_seq))
     return 0;

   diff = sa->last_seq - seq;

   if (ESP_WINDOW_SIZE > diff)
     return (sa->replay_window & (1ULL << diff)) ? 1 : 0;
   else
     return 1;

   return 0;
 }

 always_inline int
 esp_replay_check_esn (ipsec_sa_t * sa, u32 seq)
 {
   u32 tl = sa->last_seq;
   u32 th = sa->last_seq_hi;
   u32 diff = tl - seq;

   if (PREDICT_TRUE (tl >= (ESP_WINDOW_SIZE - 1)))
     {
       if (seq >= (tl - ESP_WINDOW_SIZE + 1))
 	{
 	  sa->seq_hi = th;
 	  if (seq <= tl)
 	    return (sa->replay_window & (1ULL << diff)) ? 1 : 0;
 	  else
 	    return 0;
 	}
       else
 	{
 	  sa->seq_hi = th + 1;
 	  return 0;
 	}
     }
   else
     {
       if (seq >= (tl - ESP_WINDOW_SIZE + 1))
 	{
 	  sa->seq_hi = th - 1;
 	  return (sa->replay_window & (1ULL << diff)) ? 1 : 0;
 	}
       else
 	{
 	  sa->seq_hi = th;
 	  if (seq <= tl)
 	    return (sa->replay_window & (1ULL << diff)) ? 1 : 0;
 	  else
 	    return 0;
 	}
     }

   return 0;
 }

 /* TODO seq increment should be atomic to be accessed by multiple workers */
 always_inline void
 esp_replay_advance (ipsec_sa_t * sa, u32 seq)
 {
   u32 pos;

   if (seq > sa->last_seq)
     {
       pos = seq - sa->last_seq;
       if (pos < ESP_WINDOW_SIZE)
 	sa->replay_window = ((sa->replay_window) << pos) | 1;
       else
 	sa->replay_window = 1;
       sa->last_seq = seq;
     }
   else
     {
       pos = sa->last_seq - seq;
       sa->replay_window |= (1ULL << pos);
     }
 }

 always_inline void
 esp_replay_advance_esn (ipsec_sa_t * sa, u32 seq)
 {
   int wrap = sa->seq_hi - sa->last_seq_hi;
   u32 pos;

   if (wrap == 0 && seq > sa->last_seq)
     {
       pos = seq - sa->last_seq;
       if (pos < ESP_WINDOW_SIZE)
 	sa->replay_window = ((sa->replay_window) << pos) | 1;
       else
 	sa->replay_window = 1;
       sa->last_seq = seq;
     }
   else if (wrap > 0)
     {
       pos = ~seq + sa->last_seq + 1;
       if (pos < ESP_WINDOW_SIZE)
 	sa->replay_window = ((sa->replay_window) << pos) | 1;
       else
 	sa->replay_window = 1;
       sa->last_seq = seq;
       sa->last_seq_hi = sa->seq_hi;
     }
   else if (wrap < 0)
     {
       pos = ~seq + sa->last_seq + 1;
       sa->replay_window |= (1ULL << pos);
     }
   else
     {
       pos = sa->last_seq - seq;
       sa->replay_window |= (1ULL << pos);
     }
 }

 always_inline int
 esp_seq_advance (ipsec_sa_t * sa)
 {
   if (PREDICT_TRUE (sa->use_esn))
     {
       if (PREDICT_FALSE (sa->seq == ESP_SEQ_MAX))
 	{
 	  if (PREDICT_FALSE
 	      (sa->use_anti_replay && sa->seq_hi == ESP_SEQ_MAX))
 	    return 1;
 	  sa->seq_hi++;
 	}
       sa->seq++;
     }
   else
     {
       if (PREDICT_FALSE (sa->use_anti_replay && sa->seq == ESP_SEQ_MAX))
 	return 1;
       sa->seq++;
     }

   return 0;
 }

 always_inline void
 ipsec_proto_init ()
 {
   ipsec_proto_main_t *em = &ipsec_proto_main;
   vlib_thread_main_t *tm = vlib_get_thread_main ();

   memset (em, 0, sizeof (em[0]));

   vec_validate (em->ipsec_proto_main_crypto_algs, IPSEC_CRYPTO_N_ALG - 1);
   em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_128].type =
     EVP_aes_128_cbc ();
   em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_192].type =
     EVP_aes_192_cbc ();
   em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_256].type =
     EVP_aes_256_cbc ();
   em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_128].iv_size = 16;
   em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_192].iv_size = 16;
   em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_256].iv_size = 16;
   em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_128].block_size =
     16;
   em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_192].block_size =
     16;
   em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_256].block_size =
     16;
   em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_DES_CBC].type =
     EVP_des_cbc ();
   em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_3DES_CBC].type =
     EVP_des_ede3_cbc ();
   em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_DES_CBC].block_size = 8;
   em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_3DES_CBC].block_size = 8;
   em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_DES_CBC].iv_size = 8;
   em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_3DES_CBC].iv_size = 8;

   vec_validate (em->ipsec_proto_main_integ_algs, IPSEC_INTEG_N_ALG - 1);
   ipsec_proto_main_integ_alg_t *i;

   i = &em->ipsec_proto_main_integ_algs[IPSEC_INTEG_ALG_SHA1_96];
   i->md = EVP_sha1 ();
   i->trunc_size = 12;

   i = &em->ipsec_proto_main_integ_algs[IPSEC_INTEG_ALG_SHA_256_96];
   i->md = EVP_sha256 ();
   i->trunc_size = 12;

   i = &em->ipsec_proto_main_integ_algs[IPSEC_INTEG_ALG_SHA_256_128];
   i->md = EVP_sha256 ();
   i->trunc_size = 16;

   i = &em->ipsec_proto_main_integ_algs[IPSEC_INTEG_ALG_SHA_384_192];
   i->md = EVP_sha384 ();
   i->trunc_size = 24;

   i = &em->ipsec_proto_main_integ_algs[IPSEC_INTEG_ALG_SHA_512_256];
   i->md = EVP_sha512 ();
   i->trunc_size = 32;

   vec_validate_aligned (em->per_thread_data, tm->n_vlib_mains - 1,
 			CLIB_CACHE_LINE_BYTES);
   int thread_id;

   for (thread_id = 0; thread_id < tm->n_vlib_mains; thread_id++)
     {
 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
       em->per_thread_data[thread_id].encrypt_ctx = EVP_CIPHER_CTX_new ();
       em->per_thread_data[thread_id].decrypt_ctx = EVP_CIPHER_CTX_new ();
       em->per_thread_data[thread_id].hmac_ctx = HMAC_CTX_new ();
 #else
       EVP_CIPHER_CTX_init (&(em->per_thread_data[thread_id].encrypt_ctx));
       EVP_CIPHER_CTX_init (&(em->per_thread_data[thread_id].decrypt_ctx));
       HMAC_CTX_init (&(em->per_thread_data[thread_id].hmac_ctx));
 #endif
     }
 }

 always_inline unsigned int
 hmac_calc (ipsec_integ_alg_t alg,
 	   u8 * key,
 	   int key_len,
 	   u8 * data, int data_len, u8 * signature, u8 use_esn, u32 seq_hi)
 {
   ipsec_proto_main_t *em = &ipsec_proto_main;
   u32 thread_index = vlib_get_thread_index ();
 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
   HMAC_CTX *ctx = em->per_thread_data[thread_index].hmac_ctx;
 #else
   HMAC_CTX *ctx = &(em->per_thread_data[thread_index].hmac_ctx);
 #endif
   const EVP_MD *md = NULL;
   unsigned int len;

   ASSERT (alg < IPSEC_INTEG_N_ALG);

   if (PREDICT_FALSE (em->ipsec_proto_main_integ_algs[alg].md == 0))
     return 0;

   if (PREDICT_FALSE (alg != em->per_thread_data[thread_index].last_integ_alg))
     {
       md = em->ipsec_proto_main_integ_algs[alg].md;
       em->per_thread_data[thread_index].last_integ_alg = alg;
     }

   HMAC_Init_ex (ctx, key, key_len, md, NULL);

   HMAC_Update (ctx, data, data_len);

   if (PREDICT_TRUE (use_esn))
     HMAC_Update (ctx, (u8 *) & seq_hi, sizeof (seq_hi));
   HMAC_Final (ctx, signature, &len);

   return em->ipsec_proto_main_integ_algs[alg].trunc_size;
 }

 #endif /* __ESP_H__ */

 /*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables:
  * eval: (c-set-style "gnu")
  * End:
  */
	/*
	* Copyright (c) 2015 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 __ESP_H__
	#define __ESP_H__

	#include <vnet/ip/ip.h>
	#include <vnet/ipsec/ipsec.h>

	#include <openssl/hmac.h>
	#include <openssl/rand.h>
	#include <openssl/evp.h>

	typedef struct
	{
	u32 spi;
	u32 seq;
	u8 data[0];
	} esp_header_t;

	typedef struct
	{
	u8 pad_length;
	u8 next_header;
	} esp_footer_t;

	/* INDENT-OFF */
	typedef CLIB_PACKED (struct {
	ip4_header_t ip4;
	esp_header_t esp;
	}) ip4_and_esp_header_t;
	/* INDENT-ON */

	/* INDENT-OFF */
	typedef CLIB_PACKED (struct {
	ip6_header_t ip6;
	esp_header_t esp;
	}) ip6_and_esp_header_t;
	/* INDENT-ON */

	typedef struct
	{
	const EVP_CIPHER *type;
	u8 iv_size;
	u8 block_size;
	} ipsec_proto_main_crypto_alg_t;

	typedef struct
	{
	const EVP_MD *md;
	u8 trunc_size;
	} ipsec_proto_main_integ_alg_t;

	typedef struct
	{
	CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
	#if OPENSSL_VERSION_NUMBER >= 0x10100000L
	EVP_CIPHER_CTX *encrypt_ctx;
	#else
	EVP_CIPHER_CTX encrypt_ctx;
	#endif
	CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
	#if OPENSSL_VERSION_NUMBER >= 0x10100000L
	EVP_CIPHER_CTX *decrypt_ctx;
	#else
	EVP_CIPHER_CTX decrypt_ctx;
	#endif
	CLIB_CACHE_LINE_ALIGN_MARK (cacheline2);
	#if OPENSSL_VERSION_NUMBER >= 0x10100000L
	HMAC_CTX *hmac_ctx;
	#else
	HMAC_CTX hmac_ctx;
	#endif
	ipsec_crypto_alg_t last_encrypt_alg;
	ipsec_crypto_alg_t last_decrypt_alg;
	ipsec_integ_alg_t last_integ_alg;
	} ipsec_proto_main_per_thread_data_t;

	typedef struct
	{
	ipsec_proto_main_crypto_alg_t *ipsec_proto_main_crypto_algs;
	ipsec_proto_main_integ_alg_t *ipsec_proto_main_integ_algs;
	ipsec_proto_main_per_thread_data_t *per_thread_data;
	} ipsec_proto_main_t;

	extern ipsec_proto_main_t ipsec_proto_main;

	#define ESP_WINDOW_SIZE (64)
	#define ESP_SEQ_MAX (4294967295UL)

	u8 format_esp_header (u8 s, va_list * args);

	always_inline int
	esp_replay_check (ipsec_sa_t * sa, u32 seq)
	{
	u32 diff;

	if (PREDICT_TRUE (seq > sa->last_seq))
	return 0;

	diff = sa->last_seq - seq;

	if (ESP_WINDOW_SIZE > diff)
	return (sa->replay_window & (1ULL << diff)) ? 1 : 0;
	else
	return 1;

	return 0;
	}

	always_inline int
	esp_replay_check_esn (ipsec_sa_t * sa, u32 seq)
	{
	u32 tl = sa->last_seq;
	u32 th = sa->last_seq_hi;
	u32 diff = tl - seq;

	if (PREDICT_TRUE (tl >= (ESP_WINDOW_SIZE - 1)))
	{
	if (seq >= (tl - ESP_WINDOW_SIZE + 1))
	{
	sa->seq_hi = th;
	if (seq <= tl)
	return (sa->replay_window & (1ULL << diff)) ? 1 : 0;
	else
	return 0;
	}
	else
	{
	sa->seq_hi = th + 1;
	return 0;
	}
	}
	else
	{
	if (seq >= (tl - ESP_WINDOW_SIZE + 1))
	{
	sa->seq_hi = th - 1;
	return (sa->replay_window & (1ULL << diff)) ? 1 : 0;
	}
	else
	{
	sa->seq_hi = th;
	if (seq <= tl)
	return (sa->replay_window & (1ULL << diff)) ? 1 : 0;
	else
	return 0;
	}
	}

	return 0;
	}

	/* TODO seq increment should be atomic to be accessed by multiple workers */
	always_inline void
	esp_replay_advance (ipsec_sa_t * sa, u32 seq)
	{
	u32 pos;

	if (seq > sa->last_seq)
	{
	pos = seq - sa->last_seq;
	if (pos < ESP_WINDOW_SIZE)
	sa->replay_window = ((sa->replay_window) << pos) \| 1;
	else
	sa->replay_window = 1;
	sa->last_seq = seq;
	}
	else
	{
	pos = sa->last_seq - seq;
	sa->replay_window \|= (1ULL << pos);
	}
	}

	always_inline void
	esp_replay_advance_esn (ipsec_sa_t * sa, u32 seq)
	{
	int wrap = sa->seq_hi - sa->last_seq_hi;
	u32 pos;

	if (wrap == 0 && seq > sa->last_seq)
	{
	pos = seq - sa->last_seq;
	if (pos < ESP_WINDOW_SIZE)
	sa->replay_window = ((sa->replay_window) << pos) \| 1;
	else
	sa->replay_window = 1;
	sa->last_seq = seq;
	}
	else if (wrap > 0)
	{
	pos = ~seq + sa->last_seq + 1;
	if (pos < ESP_WINDOW_SIZE)
	sa->replay_window = ((sa->replay_window) << pos) \| 1;
	else
	sa->replay_window = 1;
	sa->last_seq = seq;
	sa->last_seq_hi = sa->seq_hi;
	}
	else if (wrap < 0)
	{
	pos = ~seq + sa->last_seq + 1;
	sa->replay_window \|= (1ULL << pos);
	}
	else
	{
	pos = sa->last_seq - seq;
	sa->replay_window \|= (1ULL << pos);
	}
	}

	always_inline int
	esp_seq_advance (ipsec_sa_t * sa)
	{
	if (PREDICT_TRUE (sa->use_esn))
	{
	if (PREDICT_FALSE (sa->seq == ESP_SEQ_MAX))
	{
	if (PREDICT_FALSE
	(sa->use_anti_replay && sa->seq_hi == ESP_SEQ_MAX))
	return 1;
	sa->seq_hi++;
	}
	sa->seq++;
	}
	else
	{
	if (PREDICT_FALSE (sa->use_anti_replay && sa->seq == ESP_SEQ_MAX))
	return 1;
	sa->seq++;
	}

	return 0;
	}

	always_inline void
	ipsec_proto_init ()
	{
	ipsec_proto_main_t *em = &ipsec_proto_main;
	vlib_thread_main_t *tm = vlib_get_thread_main ();

	memset (em, 0, sizeof (em[0]));

	vec_validate (em->ipsec_proto_main_crypto_algs, IPSEC_CRYPTO_N_ALG - 1);
	em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_128].type =
	EVP_aes_128_cbc ();
	em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_192].type =
	EVP_aes_192_cbc ();
	em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_256].type =
	EVP_aes_256_cbc ();
	em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_128].iv_size = 16;
	em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_192].iv_size = 16;
	em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_256].iv_size = 16;
	em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_128].block_size =
	16;
	em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_192].block_size =
	16;
	em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_256].block_size =
	16;
	em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_DES_CBC].type =
	EVP_des_cbc ();
	em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_3DES_CBC].type =
	EVP_des_ede3_cbc ();
	em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_DES_CBC].block_size = 8;
	em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_3DES_CBC].block_size = 8;
	em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_DES_CBC].iv_size = 8;
	em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_3DES_CBC].iv_size = 8;

	vec_validate (em->ipsec_proto_main_integ_algs, IPSEC_INTEG_N_ALG - 1);
	ipsec_proto_main_integ_alg_t *i;

	i = &em->ipsec_proto_main_integ_algs[IPSEC_INTEG_ALG_SHA1_96];
	i->md = EVP_sha1 ();
	i->trunc_size = 12;

	i = &em->ipsec_proto_main_integ_algs[IPSEC_INTEG_ALG_SHA_256_96];
	i->md = EVP_sha256 ();
	i->trunc_size = 12;

	i = &em->ipsec_proto_main_integ_algs[IPSEC_INTEG_ALG_SHA_256_128];
	i->md = EVP_sha256 ();
	i->trunc_size = 16;

	i = &em->ipsec_proto_main_integ_algs[IPSEC_INTEG_ALG_SHA_384_192];
	i->md = EVP_sha384 ();
	i->trunc_size = 24;

	i = &em->ipsec_proto_main_integ_algs[IPSEC_INTEG_ALG_SHA_512_256];
	i->md = EVP_sha512 ();
	i->trunc_size = 32;

	vec_validate_aligned (em->per_thread_data, tm->n_vlib_mains - 1,
	CLIB_CACHE_LINE_BYTES);
	int thread_id;

	for (thread_id = 0; thread_id < tm->n_vlib_mains; thread_id++)
	{
	#if OPENSSL_VERSION_NUMBER >= 0x10100000L
	em->per_thread_data[thread_id].encrypt_ctx = EVP_CIPHER_CTX_new ();
	em->per_thread_data[thread_id].decrypt_ctx = EVP_CIPHER_CTX_new ();
	em->per_thread_data[thread_id].hmac_ctx = HMAC_CTX_new ();
	#else
	EVP_CIPHER_CTX_init (&(em->per_thread_data[thread_id].encrypt_ctx));
	EVP_CIPHER_CTX_init (&(em->per_thread_data[thread_id].decrypt_ctx));
	HMAC_CTX_init (&(em->per_thread_data[thread_id].hmac_ctx));
	#endif
	}
	}

	always_inline unsigned int
	hmac_calc (ipsec_integ_alg_t alg,
	u8 * key,
	int key_len,
	u8 * data, int data_len, u8 * signature, u8 use_esn, u32 seq_hi)
	{
	ipsec_proto_main_t *em = &ipsec_proto_main;
	u32 thread_index = vlib_get_thread_index ();
	#if OPENSSL_VERSION_NUMBER >= 0x10100000L
	HMAC_CTX *ctx = em->per_thread_data[thread_index].hmac_ctx;
	#else
	HMAC_CTX *ctx = &(em->per_thread_data[thread_index].hmac_ctx);
	#endif
	const EVP_MD *md = NULL;
	unsigned int len;

	ASSERT (alg < IPSEC_INTEG_N_ALG);

	if (PREDICT_FALSE (em->ipsec_proto_main_integ_algs[alg].md == 0))
	return 0;

	if (PREDICT_FALSE (alg != em->per_thread_data[thread_index].last_integ_alg))
	{
	md = em->ipsec_proto_main_integ_algs[alg].md;
	em->per_thread_data[thread_index].last_integ_alg = alg;
	}

	HMAC_Init_ex (ctx, key, key_len, md, NULL);

	HMAC_Update (ctx, data, data_len);

	if (PREDICT_TRUE (use_esn))
	HMAC_Update (ctx, (u8 *) & seq_hi, sizeof (seq_hi));
	HMAC_Final (ctx, signature, &len);

	return em->ipsec_proto_main_integ_algs[alg].trunc_size;
	}

	#endif /* __ESP_H__ */

	/*
	* fd.io coding-style-patch-verification: ON
	*
	* Local Variables:
	* eval: (c-set-style "gnu")
	* End:
	*/