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/*
* 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.
*/
#include <vnet/devices/dpdk/dpdk.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;
typedef CLIB_PACKED (struct {
ip4_header_t ip4;
esp_header_t esp;
}) ip4_and_esp_header_t;
typedef CLIB_PACKED (struct {
ip6_header_t ip6;
esp_header_t esp;
}) ip6_and_esp_header_t;
typedef struct {
const EVP_CIPHER * type;
} esp_crypto_alg_t;
typedef struct {
const EVP_MD * md;
u8 trunc_size;
} esp_integ_alg_t;
typedef struct {
esp_crypto_alg_t * esp_crypto_algs;
esp_integ_alg_t * esp_integ_algs;
EVP_CIPHER_CTX encrypt_ctx;
EVP_CIPHER_CTX decrypt_ctx;
HMAC_CTX hmac_ctx;
ipsec_crypto_alg_t last_encrytp_alg;
ipsec_crypto_alg_t last_decrytp_alg;
ipsec_integ_alg_t last_integ_alg;
} esp_main_t;
esp_main_t esp_main;
always_inline void
esp_init()
{
esp_main_t * em = &esp_main;
memset (em, 0, sizeof (em[0]));
vec_validate(em->esp_crypto_algs, IPSEC_CRYPTO_N_ALG - 1);
em->esp_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_128].type = EVP_aes_128_cbc();
em->esp_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_192].type = EVP_aes_192_cbc();
em->esp_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_256].type = EVP_aes_256_cbc();
vec_validate(em->esp_integ_algs, IPSEC_INTEG_N_ALG - 1);
esp_integ_alg_t * i;
i = &em->esp_integ_algs[IPSEC_INTEG_ALG_SHA1_96];
i->md = EVP_sha1();
i->trunc_size = 12;
i = &em->esp_integ_algs[IPSEC_INTEG_ALG_SHA_256_96];
i->md = EVP_sha256();
i->trunc_size = 12;
i = &em->esp_integ_algs[IPSEC_INTEG_ALG_SHA_256_128];
i->md = EVP_sha256();
i->trunc_size = 16;
i = &em->esp_integ_algs[IPSEC_INTEG_ALG_SHA_384_192];
i->md = EVP_sha384();
i->trunc_size = 24;
i = &em->esp_integ_algs[IPSEC_INTEG_ALG_SHA_512_256];
i->md = EVP_sha512();
i->trunc_size = 32;
EVP_CIPHER_CTX_init(&(em->encrypt_ctx));
EVP_CIPHER_CTX_init(&(em->decrypt_ctx));
HMAC_CTX_init(&(em->hmac_ctx));
}
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)
{
esp_main_t * em = &esp_main;
HMAC_CTX * ctx = &(em->hmac_ctx);
const EVP_MD * md = NULL;
unsigned int len;
ASSERT(alg < IPSEC_INTEG_N_ALG);
if (PREDICT_FALSE(em->esp_integ_algs[alg].md == 0))
return 0;
if (PREDICT_FALSE(alg != em->last_integ_alg)) {
md = em->esp_integ_algs[alg].md;
em->last_integ_alg = alg;
}
HMAC_Init(ctx, key, key_len, md);
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->esp_integ_algs[alg].trunc_size;
}
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