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/*
* ngtcp2
*
* Copyright (c) 2017 ngtcp2 contributors
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef NGTCP2_CRYPTO_H
#define NGTCP2_CRYPTO_H
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <ngtcp2/ngtcp2.h>
#include "ngtcp2_mem.h"
/* NGTCP2_INITIAL_AEAD_OVERHEAD is an overhead of AEAD used by Initial
packets. Because QUIC uses AEAD_AES_128_GCM, the overhead is 16
bytes. */
#define NGTCP2_INITIAL_AEAD_OVERHEAD 16
/* NGTCP2_MAX_AEAD_OVERHEAD is expected maximum AEAD overhead. */
#define NGTCP2_MAX_AEAD_OVERHEAD 16
/* NGTCP2_CRYPTO_KM_FLAG_NONE indicates that no flag is set. */
#define NGTCP2_CRYPTO_KM_FLAG_NONE 0x00u
/* NGTCP2_CRYPTO_KM_FLAG_KEY_PHASE_ONE is set if key phase bit is
set. */
#define NGTCP2_CRYPTO_KM_FLAG_KEY_PHASE_ONE 0x01u
typedef struct ngtcp2_crypto_km {
ngtcp2_vec secret;
ngtcp2_crypto_aead_ctx aead_ctx;
ngtcp2_vec iv;
/* pkt_num is a packet number of a packet which uses this keying
material. For encryption key, it is the lowest packet number of
a packet. For decryption key, it is the lowest packet number of
a packet which can be decrypted with this keying material. */
int64_t pkt_num;
/* use_count is the number of encryption applied with this key.
This field is only used for tx key. */
uint64_t use_count;
/* flags is the bitwise OR of zero or more of
NGTCP2_CRYPTO_KM_FLAG_*. */
uint8_t flags;
} ngtcp2_crypto_km;
/*
* ngtcp2_crypto_km_new creates new ngtcp2_crypto_km object and
* assigns its pointer to |*pckm|. The |secret| of length
* |secretlen|, the |key| of length |keylen| and the |iv| of length
* |ivlen| are copied to |*pckm|. If |secretlen| == 0, the function
* assumes no secret is given which is acceptable. The sole reason to
* store secret is update keys. Only 1RTT key can be updated.
*/
int ngtcp2_crypto_km_new(ngtcp2_crypto_km **pckm, const uint8_t *secret,
size_t secretlen,
const ngtcp2_crypto_aead_ctx *aead_ctx,
const uint8_t *iv, size_t ivlen,
const ngtcp2_mem *mem);
/*
* ngtcp2_crypto_km_nocopy_new is similar to ngtcp2_crypto_km_new, but
* it does not copy secret, key and IV.
*/
int ngtcp2_crypto_km_nocopy_new(ngtcp2_crypto_km **pckm, size_t secretlen,
size_t ivlen, const ngtcp2_mem *mem);
void ngtcp2_crypto_km_del(ngtcp2_crypto_km *ckm, const ngtcp2_mem *mem);
typedef struct ngtcp2_crypto_cc {
ngtcp2_crypto_aead aead;
ngtcp2_crypto_cipher hp;
ngtcp2_crypto_km *ckm;
ngtcp2_crypto_cipher_ctx hp_ctx;
ngtcp2_encrypt encrypt;
ngtcp2_decrypt decrypt;
ngtcp2_hp_mask hp_mask;
} ngtcp2_crypto_cc;
void ngtcp2_crypto_create_nonce(uint8_t *dest, const uint8_t *iv, size_t ivlen,
int64_t pkt_num);
#endif /* NGTCP2_CRYPTO_H */
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