ocrypto_srtp.h

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/*
 * Copyright (c) 2016 - 2025 Nordic Semiconductor ASA
 * Copyright (c) since 2013 Oberon microsystems AG
 *
 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 */
 
 
#ifndef OCRYPTO_SRTP_H
#define OCRYPTO_SRTP_H
 
#include <stddef.h>
#include <stdint.h>
 
#include "ocrypto_aes_key.h"
 
 
#ifdef __cplusplus
extern "C" {
#endif
 
 
#define ocrypto_srtp_AUTH_KEY_SIZE  (20)
 
#define ocrypto_srtp_SALT_SIZE      (14)
 
#define ocrypto_srtp_MAX_KEY_SIZE   (ocrypto_aes256_KEY_BYTES)
 
typedef struct {
    uint32_t key_size;
 
    uint32_t tag_size;
 
    uint8_t encr_key[ocrypto_srtp_MAX_KEY_SIZE];
 
    uint8_t auth_key[ocrypto_srtp_AUTH_KEY_SIZE];
 
    uint8_t salt_key[ocrypto_srtp_SALT_SIZE];
} ocrypto_srtp_ctx;
void ocrypto_srtp_setup_ctx(
    ocrypto_srtp_ctx *srtp_ctx,
    ocrypto_srtp_ctx *srtcp_ctx,
    const uint8_t *key,
    uint32_t key_size,
    const uint8_t *salt,
    uint32_t tag_size,
    uint32_t ssrc);
 
void ocrypto_srtp_encrypt(
    const ocrypto_srtp_ctx *srtp_ctx,
    uint8_t *packet,
    const uint8_t *data_bytes,
    size_t num_header_bytes,
    size_t num_data_bytes,
    uint32_t index);
 
void ocrypto_srtp_decrypt(
    const ocrypto_srtp_ctx *srtp_ctx,
    uint8_t *data,
    const uint8_t *packet_bytes,
    size_t num_packet_bytes,
    uint32_t index);
 
void ocrypto_srtp_authenticate(
    const ocrypto_srtp_ctx *srtp_ctx,
    uint8_t *tag,
    const uint8_t *bytes,
    size_t num_bytes,
    uint32_t index);
 
int ocrypto_srtp_verify_authentication(
    const ocrypto_srtp_ctx *srtp_ctx,
    const uint8_t *tag,
    const uint8_t *bytes,
    size_t num_bytes,
    uint32_t index);
 
#ifdef __cplusplus
}
#endif
 
#endif