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Purism-Calls/plugins/provider/sip/calls-srtp-utils.h
Дилян Палаузов 378da62ccb srtp-utils: Add skeleton code to ease adding crypto suites
With this in place enabling an additional crypto suite
would only require two changes:
- Adding GStreamer capability mapping
- Add case in calls_srtp_parse_sdp_crypto_attribute()
2023-05-09 13:23:43 +00:00

140 lines
5.8 KiB
C

/*
* Copyright (C) 2022 Purism SPC
*
* This file is part of Calls.
*
* Calls is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Calls is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Calls. If not, see <http://www.gnu.org/licenses/>.
*
* Author: Evangelos Ribeiro Tzaras <evangelos.tzaras@puri.sm>
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#pragma once
#include <glib.h>
G_BEGIN_DECLS
typedef enum {
CALLS_SRTP_SUITE_UNKNOWN = 0,
CALLS_SRTP_SUITE_AES_CM_128_SHA1_32, /* RFC 4568 */
CALLS_SRTP_SUITE_AES_CM_128_SHA1_80, /* RFC 4568 */
CALLS_SRTP_SUITE_AES_192_CM_SHA1_32, /* RFC 6188 not supperted by Gst */
CALLS_SRTP_SUITE_AES_192_CM_SHA1_80, /* RFC 6188 not supperted by Gst */
CALLS_SRTP_SUITE_AES_256_CM_SHA1_32, /* RFC 6188 */
CALLS_SRTP_SUITE_AES_256_CM_SHA1_80, /* RFC 6188 */
CALLS_SRTP_SUITE_F8_128_HMAC_SHA1_32, /* RFC 4568 but not supported by GstSrtpEnc/GstSrtpDec */
CALLS_SRTP_SUITE_AEAD_AES_128_GCM, /* RFC 7714 TODO support in the future */
CALLS_SRTP_SUITE_AEAD_AES_256_GCM /* RFC 7714 TODO support in the future */
} calls_srtp_crypto_suite;
typedef enum {
CALLS_SRTP_FEC_ORDER_UNSET = 0,
CALLS_SRTP_FEC_ORDER_FEC_SRTP,
CALLS_SRTP_FEC_ORDER_SRTP_FEC
} calls_srtp_fec_order;
typedef enum {
CALLS_SRTP_LIFETIME_UNSET = 0,
CALLS_SRTP_LIFETIME_AS_DECIMAL_NUMBER,
CALLS_SRTP_LIFETIME_AS_POWER_OF_TWO
} calls_srtp_lifetime_type;
/* from GStreamer */
typedef enum {
GST_SRTP_CIPHER_NULL,
GST_SRTP_CIPHER_AES_128_ICM,
GST_SRTP_CIPHER_AES_256_ICM,
GST_SRTP_CIPHER_AES_128_GCM,
GST_SRTP_CIPHER_AES_256_GCM
} GstSrtpCipherType;
typedef enum {
GST_SRTP_AUTH_NULL,
GST_SRTP_AUTH_HMAC_SHA1_32,
GST_SRTP_AUTH_HMAC_SHA1_80
} GstSrtpAuthType;
typedef struct {
char *b64_keysalt;
calls_srtp_lifetime_type lifetime_type;
/* maximum lifetime: SRTP 2^48 packets; SRTCP 2^31 packets; libsrtp uses a hardcoded limit of 2^48 */
guint64 lifetime;
guint64 mki;
guint mki_length;
} calls_srtp_crypto_key_param;
typedef struct {
gint tag;
calls_srtp_crypto_suite crypto_suite;
calls_srtp_crypto_key_param *key_params;
guint n_key_params;
/** session parameters
* For more information see https://datatracker.ietf.org/doc/html/rfc4568#section-6.3
* KDR (key derivation rate) defaults to 0; declarative parameter
* decimal integer in {1,2,...,24}, denotes a power of two. 0 means unspecified
* defaulting to a single initial key derivation
* UNENCRYPTED_SRTCP, UNENCRYPTED_SRTP; negotiated parameter
* UNAUTHENTICATED_SRTP; negotiated parameter
* FEC_ORDER; declarative parameter
* FEC_KEY separate key-params for forward error correction; declarative parameter
* WSH (Window Size Hint); declarative parameter; MAY be ignored
*/
gint kdr;
gboolean unencrypted_srtp;
gboolean unencrypted_srtcp;
gboolean unauthenticated_srtp;
calls_srtp_fec_order fec_order; /* FEC in RTP: RFC2733 */
char *b64_fec_key; /* TODO this should also be an array of calls_srtp_crypto_key_param */
guint window_size_hint;
} calls_srtp_crypto_attribute;
guchar *calls_srtp_generate_key_salt (gsize length);
guchar *calls_srtp_generate_key_salt_for_suite (calls_srtp_crypto_suite suite);
calls_srtp_crypto_attribute *calls_srtp_parse_sdp_crypto_attribute (const char *attr,
GError **error);
char *calls_srtp_print_sdp_crypto_attribute (calls_srtp_crypto_attribute *attr,
GError **error);
calls_srtp_crypto_attribute *calls_srtp_crypto_attribute_new (guint n_key_params);
gboolean calls_srtp_crypto_attribute_init_keys (calls_srtp_crypto_attribute *attr);
void calls_srtp_crypto_attribute_free (calls_srtp_crypto_attribute *attr);
char *calls_srtp_generate_crypto_for_offer (void);
gboolean calls_srtp_crypto_get_srtpdec_params (calls_srtp_crypto_attribute *attr,
const char **srtp_cipher,
const char **srtp_auth,
const char **srtcp_cipher,
const char **srtcp_auth);
gboolean calls_srtp_crypto_get_srtpenc_params (calls_srtp_crypto_attribute *attr,
GstSrtpCipherType *srtp_cipher,
GstSrtpAuthType *srtp_auth,
GstSrtpCipherType *srtcp_cipher,
GstSrtpAuthType *srtcp_auth);
G_DEFINE_AUTOPTR_CLEANUP_FUNC (calls_srtp_crypto_attribute, calls_srtp_crypto_attribute_free)
G_END_DECLS