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ngtcp2_crypto.h
621 lines (581 loc) Β· 22.5 KB
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ngtcp2_crypto.h
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/*
* ngtcp2
*
* Copyright (c) 2019 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
#include <ngtcp2/ngtcp2.h>
#ifdef __cplusplus
extern "C" {
#endif
#define NGTCP2_CRYPTO_INITIAL_SECRETLEN 32
#define NGTCP2_CRYPTO_INITIAL_KEYLEN 16
#define NGTCP2_CRYPTO_INITIAL_IVLEN 12
/**
* @function
*
* `ngtcp2_crypto_ctx_initial` initializes |ctx| for Initial packet
* encryption and decryption.
*/
NGTCP2_EXTERN ngtcp2_crypto_ctx *
ngtcp2_crypto_ctx_initial(ngtcp2_crypto_ctx *ctx);
/**
* @function
*
* `ngtcp2_crypto_ctx_tls` initializes |ctx| by extracting negotiated
* ciphers and message digests from native TLS session
* |tls_native_handle|. This is used for encrypting/decrypting
* Handshake and Short packets.
*
* If libngtcp2_crypto_openssl is linked, |tls_native_handle| must be
* a pointer to SSL object.
*/
NGTCP2_EXTERN ngtcp2_crypto_ctx *ngtcp2_crypto_ctx_tls(ngtcp2_crypto_ctx *ctx,
void *tls_native_handle);
/**
* @function
*
* `ngtcp2_crypto_aead_retry` initializes |aead| with the AEAD cipher
* AEAD_AES_128_GCM for Retry packet integrity protection.
*/
NGTCP2_EXTERN ngtcp2_crypto_aead *
ngtcp2_crypto_aead_retry(ngtcp2_crypto_aead *aead);
/**
* @function
*
* `ngtcp2_crypto_md_hashlen` returns the length of |md| output.
*/
NGTCP2_EXTERN size_t ngtcp2_crypto_md_hashlen(const ngtcp2_crypto_md *md);
/**
* @function
*
* `ngtcp2_crypto_aead_keylen` returns the length of key for |aead|.
*/
NGTCP2_EXTERN size_t ngtcp2_crypto_aead_keylen(const ngtcp2_crypto_aead *aead);
/**
* @function
*
* `ngtcp2_crypto_aead_noncelen` returns the length of nonce for
* |aead|.
*/
NGTCP2_EXTERN size_t
ngtcp2_crypto_aead_noncelen(const ngtcp2_crypto_aead *aead);
/**
* @function
*
* `ngtcp2_crypto_aead_taglen` returns the length of tag for |aead|.
*/
NGTCP2_EXTERN size_t ngtcp2_crypto_aead_taglen(const ngtcp2_crypto_aead *aead);
/**
* @function
*
* `ngtcp2_crypto_hkdf_extract` performs HKDF extract operation. The
* result is the length of |md| and is stored to the buffer pointed by
* |dest|. The caller is responsible to specify the buffer that can
* store the output.
*
* This function returns 0 if it succeeds, or -1.
*/
NGTCP2_EXTERN int
ngtcp2_crypto_hkdf_extract(uint8_t *dest, const ngtcp2_crypto_md *md,
const uint8_t *secret, size_t secretlen,
const uint8_t *salt, size_t saltlen);
/**
* @function
*
* `ngtcp2_crypto_hkdf_expand` performs HKDF expand operation. The
* result is |destlen| bytes long and is stored to the buffer pointed
* by |dest|.
*
* This function returns 0 if it succeeds, or -1.
*/
NGTCP2_EXTERN int ngtcp2_crypto_hkdf_expand(uint8_t *dest, size_t destlen,
const ngtcp2_crypto_md *md,
const uint8_t *secret,
size_t secretlen,
const uint8_t *info,
size_t infolen);
/**
* @function
*
* `ngtcp2_crypto_hkdf_expand_label` performs HKDF expand label. The
* result is |destlen| bytes long and is stored to the buffer pointed
* by |dest|.
*
* This function returns 0 if it succeeds, or -1.
*/
NGTCP2_EXTERN int ngtcp2_crypto_hkdf_expand_label(uint8_t *dest, size_t destlen,
const ngtcp2_crypto_md *md,
const uint8_t *secret,
size_t secretlen,
const uint8_t *label,
size_t labellen);
/**
* @enum
*
* `ngtcp2_crypto_side` indicates which side the application
* implements; client or server.
*/
typedef enum ngtcp2_crypto_side {
/**
* ``NGTCP2_CRYPTO_SIDE_CLIENT`` indicates that the application is
* client.
*/
NGTCP2_CRYPTO_SIDE_CLIENT,
/**
* ``NGTCP2_CRYPTO_SIDE_SERVER`` indicates that the application is
* server.
*/
NGTCP2_CRYPTO_SIDE_SERVER
} ngtcp2_crypto_side;
/**
* @function
*
* `ngtcp2_crypto_packet_protection_ivlen` returns the length of IV
* used to encrypt QUIC packet.
*/
NGTCP2_EXTERN size_t
ngtcp2_crypto_packet_protection_ivlen(const ngtcp2_crypto_aead *aead);
/**
* @function
*
* `ngtcp2_crypto_derive_packet_protection_key` derives packet
* protection key. This function writes packet protection key into
* the buffer pointed by |key|. |key| must point to the buffer which
* is at least ngtcp2_crypto_aead_keylen(aead) bytes long. This
* function writes packet protection IV into |iv|. |iv| must point to
* the buffer which is at least
* ngtcp2_crypto_packet_protection_ivlen(aead). |key| is
* ngtcp2_crypto_aead_keylen(aead) bytes long. |iv| is
* ngtcp2_crypto_packet_protection_ivlen(aead) bytes long.
*
* If |hp| is not NULL, this function also derives packet header
* protection key and writes the key into the buffer pointed by |hp|.
* The length of key is ngtcp2_crypto_aead_keylen(aead) bytes long.
* |hp|, if not NULL, must have enough capacity to store the key.
*
* This function returns 0 if it succeeds, or -1.
*/
NGTCP2_EXTERN int ngtcp2_crypto_derive_packet_protection_key(
uint8_t *key, uint8_t *iv, uint8_t *hp, const ngtcp2_crypto_aead *aead,
const ngtcp2_crypto_md *md, const uint8_t *secret, size_t secretlen);
/**
* @function
*
* `ngtcp2_crypto_encrypt` encrypts |plaintext| of length
* |plaintextlen| and writes the ciphertext into the buffer pointed by
* |dest|. The length of ciphertext is plaintextlen +
* ngtcp2_crypto_aead_taglen(aead) bytes long. |dest| must have
* enough capacity to store the ciphertext. It is allowed to specify
* the same value to |dest| and |plaintext|.
*
* This function returns 0 if it succeeds, or -1.
*/
NGTCP2_EXTERN int ngtcp2_crypto_encrypt(uint8_t *dest,
const ngtcp2_crypto_aead *aead,
const ngtcp2_crypto_aead_ctx *aead_ctx,
const uint8_t *plaintext,
size_t plaintextlen,
const uint8_t *nonce, size_t noncelen,
const uint8_t *ad, size_t adlen);
/**
* @function
*
* `ngtcp2_crypto_encrypt_cb` is a wrapper function around
* `ngtcp2_crypto_encrypt`. It can be directly passed to encrypt
* callback to ngtcp2_callbacks.
*
* This function returns 0 if it succeeds, or
* :enum:`NGTCP2_ERR_CALLBACK_FAILURE`.
*/
NGTCP2_EXTERN int
ngtcp2_crypto_encrypt_cb(uint8_t *dest, const ngtcp2_crypto_aead *aead,
const ngtcp2_crypto_aead_ctx *aead_ctx,
const uint8_t *plaintext, size_t plaintextlen,
const uint8_t *nonce, size_t noncelen,
const uint8_t *ad, size_t adlen);
/**
* @function
*
* `ngtcp2_crypto_decrypt` decrypts |ciphertext| of length
* |ciphertextlen| and writes the plaintext into the buffer pointed by
* |dest|. The length of plaintext is ciphertextlen -
* ngtcp2_crypto_aead_taglen(aead) bytes long. |dest| must have enough
* capacity to store the plaintext. It is allowed to specify the same
* value to |dest| and |ciphertext|.
*
* This function returns 0 if it succeeds, or -1.
*/
NGTCP2_EXTERN int ngtcp2_crypto_decrypt(uint8_t *dest,
const ngtcp2_crypto_aead *aead,
const ngtcp2_crypto_aead_ctx *aead_ctx,
const uint8_t *ciphertext,
size_t ciphertextlen,
const uint8_t *nonce, size_t noncelen,
const uint8_t *ad, size_t adlen);
/**
* @function
*
* `ngtcp2_crypto_decrypt_cb` is a wrapper function around
* `ngtcp2_crypto_decrypt`. It can be directly passed to decrypt
* callback to ngtcp2_callbacks.
*
* This function returns 0 if it succeeds, or
* :enum:`NGTCP2_ERR_TLS_DECRYPT`.
*/
NGTCP2_EXTERN int
ngtcp2_crypto_decrypt_cb(uint8_t *dest, const ngtcp2_crypto_aead *aead,
const ngtcp2_crypto_aead_ctx *aead_ctx,
const uint8_t *ciphertext, size_t ciphertextlen,
const uint8_t *nonce, size_t noncelen,
const uint8_t *ad, size_t adlen);
/**
* @function
*
* `ngtcp2_crypto_hp_mask` generates mask which is used in packet
* header encryption. The mask is written to the buffer pointed by
* |dest|. The length of mask is 5 bytes. |dest| must have enough
* capacity to store the mask.
*
* This function returns 0 if it succeeds, or -1.
*/
NGTCP2_EXTERN int ngtcp2_crypto_hp_mask(uint8_t *dest,
const ngtcp2_crypto_cipher *hp,
const ngtcp2_crypto_cipher_ctx *hp_ctx,
const uint8_t *sample);
/**
* @function
*
* `ngtcp2_crypto_hp_mask_cb` is a wrapper function around
* `ngtcp2_crypto_hp_mask`. It can be directly passed to hp_mask
* callback to ngtcp2_callbacks.
*
* This function returns 0 if it succeeds, or
* :enum:`NGTCP2_ERR_CALLBACK_FAILURE`.
*/
NGTCP2_EXTERN int
ngtcp2_crypto_hp_mask_cb(uint8_t *dest, const ngtcp2_crypto_cipher *hp,
const ngtcp2_crypto_cipher_ctx *hp_ctx,
const uint8_t *sample);
/**
* @function
*
* `ngtcp2_crypto_derive_and_install_rx_key` derives the rx keys from
* |secret| and installs new keys to |conn|.
*
* If |key| is not NULL, the derived packet protection key for
* decryption is written to the buffer pointed by |key|. If |iv| is
* not NULL, the derived packet protection IV for decryption is
* written to the buffer pointed by |iv|. If |hp| is not NULL, the
* derived header protection key for decryption is written to the
* buffer pointed by |hp|.
*
* |secretlen| specifies the length of |secret|.
*
* The length of packet protection key and header protection key is
* ngtcp2_crypto_aead(ctx->aead), and the length of packet protection
* IV is ngtcp2_crypto_packet_protection_ivlen(ctx->aead) where ctx
* can be obtained by `ngtcp2_crypto_ctx_tls`.
*
* In the first call of this function, it calls
* `ngtcp2_conn_set_crypto_ctx` to set negotiated AEAD and message
* digest algorithm. After the successful call of this function,
* application can use `ngtcp2_conn_get_crypto_ctx` to get the object.
* It also calls `ngtcp2_conn_set_aead_overhead` to set AEAD tag
* length.
*
* This function returns 0 if it succeeds, or -1.
*/
NGTCP2_EXTERN int ngtcp2_crypto_derive_and_install_rx_key(
ngtcp2_conn *conn, uint8_t *key, uint8_t *iv, uint8_t *hp,
ngtcp2_crypto_level level, const uint8_t *secret, size_t secretlen);
/**
* @function
*
* `ngtcp2_crypto_derive_and_install_tx_key` derives the tx keys from
* |secret| and installs new keys to |conn|.
*
* If |key| is not NULL, the derived packet protection key for
* encryption is written to the buffer pointed by |key|. If |iv| is
* not NULL, the derived packet protection IV for encryption is
* written to the buffer pointed by |iv|. If |hp| is not NULL, the
* derived header protection key for encryption is written to the
* buffer pointed by |hp|.
*
* |secretlen| specifies the length of |secret|.
*
* The length of packet protection key and header protection key is
* ngtcp2_crypto_aead(ctx->aead), and the length of packet protection
* IV is ngtcp2_crypto_packet_protection_ivlen(ctx->aead) where ctx
* can be obtained by `ngtcp2_crypto_ctx_tls`.
*
* In the first call of this function, it calls
* `ngtcp2_conn_set_crypto_ctx` to set negotiated AEAD and message
* digest algorithm. After the successful call of this function,
* application can use `ngtcp2_conn_get_crypto_ctx` to get the object.
* It also calls `ngtcp2_conn_set_aead_overhead` to set AEAD tag
* length.
*
* If |level| is NGTCP2_CRYPTO_LEVEL_APP, this function retrieves a
* remote QUIC transport parameters extension from |tls| and sets it
* to |conn|.
*
* This function returns 0 if it succeeds, or -1.
*/
NGTCP2_EXTERN int ngtcp2_crypto_derive_and_install_tx_key(
ngtcp2_conn *conn, uint8_t *key, uint8_t *iv, uint8_t *hp,
ngtcp2_crypto_level level, const uint8_t *secret, size_t secretlen);
/**
* @function
*
* `ngtcp2_crypto_update_key` updates traffic keying materials.
*
* The new traffic secret for decryption is written to the buffer
* pointed by |rx_secret|. The length of secret is |secretlen| bytes,
* and |rx_secret| must point to the buffer which has enough capacity.
*
* The new traffic secret for encryption is written to the buffer
* pointed by |tx_secret|. The length of secret is |secretlen| bytes,
* and |tx_secret| must point to the buffer which has enough capacity.
*
* The derived packet protection key for decryption is written to the
* buffer pointed by |rx_key|. The derived packet protection IV for
* decryption is written to the buffer pointed by |rx_iv|.
* |rx_aead_ctx| must be constructed with |rx_key|.
*
* The derived packet protection key for encryption is written to the
* buffer pointed by |tx_key|. The derived packet protection IV for
* encryption is written to the buffer pointed by |tx_iv|.
* |tx_aead_ctx| must be constructed with |rx_key|.
*
* |current_rx_secret| and |current_tx_secret| are the current traffic
* secrets for decryption and encryption. |secretlen| specifies the
* length of |rx_secret| and |tx_secret|.
*
* The length of packet protection key and header protection key is
* ngtcp2_crypto_aead(ctx->aead), and the length of packet protection
* IV is ngtcp2_crypto_packet_protection_ivlen(ctx->aead) where ctx
* can be obtained by `ngtcp2_conn_get_crypto_ctx`.
*
* This function returns 0 if it succeeds, or -1.
*/
NGTCP2_EXTERN int ngtcp2_crypto_update_key(
ngtcp2_conn *conn, uint8_t *rx_secret, uint8_t *tx_secret,
ngtcp2_crypto_aead_ctx *rx_aead_ctx, uint8_t *rx_key, uint8_t *rx_iv,
ngtcp2_crypto_aead_ctx *tx_aead_ctx, uint8_t *tx_key, uint8_t *tx_iv,
const uint8_t *current_rx_secret, const uint8_t *current_tx_secret,
size_t secretlen);
/**
* @function
*
* `ngtcp2_crypto_update_key_cb` is a wrapper function around
* `ngtcp2_crypto_update_key`. It can be directly passed to
* update_key field in ngtcp2_callbacks.
*
* This function returns 0 if it succeeds, or
* :enum:`NGTCP2_ERR_CALLBACK_FAILURE`.
*/
NGTCP2_EXTERN int ngtcp2_crypto_update_key_cb(
ngtcp2_conn *conn, uint8_t *rx_secret, uint8_t *tx_secret,
ngtcp2_crypto_aead_ctx *rx_aead_ctx, uint8_t *rx_iv,
ngtcp2_crypto_aead_ctx *tx_aead_ctx, uint8_t *tx_iv,
const uint8_t *current_rx_secret, const uint8_t *current_tx_secret,
size_t secretlen, void *user_data);
/**
* @function
*
* `ngtcp2_crypto_client_initial_cb` installs initial secrets and
* encryption keys and sets QUIC transport parameters.
*
* This function can be directly passed to client_initial field in
* ngtcp2_callbacks. It is only used by client.
*
* This function returns 0 if it succeeds, or
* :enum:`NGTCP2_ERR_CALLBACK_FAILURE`.
*/
NGTCP2_EXTERN int ngtcp2_crypto_client_initial_cb(ngtcp2_conn *conn,
void *user_data);
/**
* @function
*
* `ngtcp2_crypto_recv_retry_cb` re-installs initial secrets in
* response to incoming Retry packet.
*
* This function can be directly passed to recv_retry field in
* ngtcp2_callbacks. It is only used by client.
*
* This function returns 0 if it succeeds, or
* :enum:`NGTCP2_ERR_CALLBACK_FAILURE`.
*/
NGTCP2_EXTERN int ngtcp2_crypto_recv_retry_cb(ngtcp2_conn *conn,
const ngtcp2_pkt_hd *hd,
void *user_data);
/**
* @function
*
* `ngtcp2_crypto_recv_client_initial_cb` installs initial secrets in
* response to an incoming Initial packet from client, and sets QUIC
* transport parameters.
*
* This function can be directly passed to recv_client_initial field
* in ngtcp2_callbacks. It is only used by server.
*
* This function returns 0 if it succeeds, or
* :enum:`NGTCP2_ERR_CALLBACK_FAILURE`.
*/
NGTCP2_EXTERN int ngtcp2_crypto_recv_client_initial_cb(ngtcp2_conn *conn,
const ngtcp2_cid *dcid,
void *user_data);
/**
* @function
*
* `ngtcp2_crypto_read_write_crypto_data` reads CRYPTO data |data| of
* length |datalen| in encryption level |crypto_level| and may feed
* outgoing CRYPTO data to |conn|. This function can drive handshake.
* This function can be also used after handshake completes. It is
* allowed to call this function with datalen == 0. In this case, no
* additional read operation is done.
*
* This function returns 0 if it succeeds, or a negative error code.
* The generic error code is -1 if a specific error code is not
* suitable. The error codes less than -10000 are specific to
* underlying TLS implementation. For OpenSSL, the error codes are
* defined in ngtcp2_crypto_openssl.h.
*/
NGTCP2_EXTERN int
ngtcp2_crypto_read_write_crypto_data(ngtcp2_conn *conn,
ngtcp2_crypto_level crypto_level,
const uint8_t *data, size_t datalen);
/**
* @function
*
* `ngtcp2_crypto_generate_stateless_reset_token` generates a
* stateless reset token using HKDF extraction with |md| using the
* given |cid| and static key |secret| as input. The token will be
* written to the buffer pointed by |token| and it must have a
* capacity of at least NGTCP2_STATELESS_RESET_TOKENLEN bytes.
*
* This function returns 0 if it succeeds, or -1.
*/
NGTCP2_EXTERN int ngtcp2_crypto_generate_stateless_reset_token(
uint8_t *token, const ngtcp2_crypto_md *md, const uint8_t *secret,
size_t secretlen, const ngtcp2_cid *cid);
/**
* @function
*
* `ngtcp2_crypto_write_connection_close` writes Initial packet
* containing CONNECTION_CLOSE with the given |error_code| to the
* buffer pointed by |dest| of length |destlen|. This function is
* designed for server to close connection without committing the
* state when validating Retry token fails. This function must not be
* used by client. The |dcid| must be the Source Connection ID in
* Initial packet from client. The |scid| must be the Destination
* Connection ID in Initial packet from client. |scid| is used to
* derive initial keying materials.
*
* This function wraps around `ngtcp2_pkt_write_connection_close` for
* easier use.
*
* This function returns 0 if it succeeds, or -1.
*/
NGTCP2_EXTERN ngtcp2_ssize ngtcp2_crypto_write_connection_close(
uint8_t *dest, size_t destlen, const ngtcp2_cid *dcid,
const ngtcp2_cid *scid, uint64_t error_code);
/**
* @function
*
* `ngtcp2_crypto_write_retry` writes Retry packet to the buffer
* pointed by |dest| of length |destlen|. |odcid| specifies Original
* Destination Connection ID. |token| specifies Retry Token, and
* |tokenlen| specifies its length.
*
* This function wraps around `ngtcp2_pkt_write_retry` for easier use.
*
* This function returns 0 if it succeeds, or -1.
*/
NGTCP2_EXTERN ngtcp2_ssize
ngtcp2_crypto_write_retry(uint8_t *dest, size_t destlen, const ngtcp2_cid *dcid,
const ngtcp2_cid *scid, const ngtcp2_cid *odcid,
const uint8_t *token, size_t tokenlen);
/**
* @function
*
* `ngtcp2_crypto_aead_ctx_encrypt_init` initializes |aead_ctx| with
* new AEAD cipher context object for encryption which is constructed
* to use |key| as encryption key. |aead| specifies AEAD cipher to
* use. |noncelen| is the length of nonce.
*
* This function returns 0 if it succeeds, or -1.
*/
NGTCP2_EXTERN int
ngtcp2_crypto_aead_ctx_encrypt_init(ngtcp2_crypto_aead_ctx *aead_ctx,
const ngtcp2_crypto_aead *aead,
const uint8_t *key, size_t noncelen);
/**
* @function
*
* `ngtcp2_crypto_aead_ctx_decrypt_init` initializes |aead_ctx| with
* new AEAD cipher context object for decryption which is constructed
* to use |key| as encryption key. |aead| specifies AEAD cipher to
* use. |noncelen| is the length of nonce.
*
* This function returns 0 if it succeeds, or -1.
*/
NGTCP2_EXTERN int
ngtcp2_crypto_aead_ctx_decrypt_init(ngtcp2_crypto_aead_ctx *aead_ctx,
const ngtcp2_crypto_aead *aead,
const uint8_t *key, size_t noncelen);
/**
* @function
*
* `ngtcp2_crypto_aead_ctx_free` frees up resources used by
* |aead_ctx|. This function does not free the memory pointed by
* |aead_ctx| itself.
*/
NGTCP2_EXTERN void
ngtcp2_crypto_aead_ctx_free(ngtcp2_crypto_aead_ctx *aead_ctx);
/**
* @function
*
* `ngtcp2_crypto_delete_crypto_aead_ctx_cb` deletes the given |aead_ctx|.
*
* This function can be directly passed to delete_crypto_aead_ctx
* field in ngtcp2_callbacks.
*/
NGTCP2_EXTERN void ngtcp2_crypto_delete_crypto_aead_ctx_cb(
ngtcp2_conn *conn, ngtcp2_crypto_aead_ctx *aead_ctx, void *user_data);
/**
* @function
*
* `ngtcp2_crypto_delete_crypto_cipher_ctx_cb` deletes the given
* |cipher_ctx|.
*
* This function can be directly passed to delete_crypto_cipher_ctx
* field in ngtcp2_callbacks.
*/
NGTCP2_EXTERN void ngtcp2_crypto_delete_crypto_cipher_ctx_cb(
ngtcp2_conn *conn, ngtcp2_crypto_cipher_ctx *cipher_ctx, void *user_data);
#ifdef __cplusplus
}
#endif
#endif /* NGTCP2_CRYPTO_H */