sdes_negotiator.h

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/*
 *  Copyright (C) 2004-2026 Savoir-faire Linux Inc.
 *
 *  This program 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.
 *
 *  This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
 */
#pragma once
 
#include "media/media_codec.h"
 
#include <stdexcept>
#include <string>
#include <vector>
 
using namespace std::literals;
 
namespace jami {
 
class ParseError : public std::invalid_argument
{
public:
    explicit ParseError(const std::string& error)
        : std::invalid_argument(error)
    {}
};
 
enum CipherMode : uint8_t { AESCounterMode, AESF8Mode };
 
enum MACMode : uint8_t { HMACSHA1 };
 
struct CryptoSuiteDefinition
{
    std::string_view name;
    int masterKeyLength;
    int masterSaltLength;
    int srtpLifetime;
    int srtcpLifetime;
    CipherMode cipher;
    int encryptionKeyLength;
    MACMode mac;
    int srtpAuthTagLength;
    int srtcpAuthTagLength;
    int srtpAuthKeyLength;
    int srtcpAuthKeyLen;
};
 
static std::vector<CryptoSuiteDefinition> CryptoSuites
    = {{"AES_CM_128_HMAC_SHA1_80"sv, 128, 112, 48, 31, AESCounterMode, 128, HMACSHA1, 80, 80, 160, 160},
 
       {"AES_CM_128_HMAC_SHA1_32"sv, 128, 112, 48, 31, AESCounterMode, 128, HMACSHA1, 32, 80, 160, 160},
 
       {"F8_128_HMAC_SHA1_80"sv, 128, 112, 48, 31, AESF8Mode, 128, HMACSHA1, 80, 80, 160, 160}};
 
class SdesNegotiator
{
public:
    SdesNegotiator();
 
    static CryptoAttribute negotiate(const std::vector<std::string>& attributes);
 
    inline explicit operator bool() const { return not CryptoSuites.empty(); }
 
private:
    static std::vector<CryptoAttribute> parse(const std::vector<std::string>& attributes);
};
 
} // namespace jami