19b307be6SVernon Mauery #pragma once 29b307be6SVernon Mauery 39b307be6SVernon Mauery #include <array> 49b307be6SVernon Mauery #include <cstdint> 59b307be6SVernon Mauery 69b307be6SVernon Mauery namespace rmcp 79b307be6SVernon Mauery { 89b307be6SVernon Mauery 99b307be6SVernon Mauery /* 109b307be6SVernon Mauery * RSP needs more keying material than can be provided by session 119b307be6SVernon Mauery * integrity key alone. As a result all keying material for the RSP 129b307be6SVernon Mauery * confidentiality algorithms will be generated by processing a 139b307be6SVernon Mauery * pre-defined set of constants using HMAC per [RFC2104], keyed by SIK. 149b307be6SVernon Mauery * These constants are constructed using a hexadecimal octet value 159b307be6SVernon Mauery * repeated up to the HMAC block size in length starting with the 169b307be6SVernon Mauery * constant 01h. This mechanism can be used to derive up to 255 179b307be6SVernon Mauery * HMAC-block-length pieces of keying material from a single SIK.For the 189b307be6SVernon Mauery * mandatory confidentiality algorithm AES-CBC-128, processing the 199b307be6SVernon Mauery * following constant will generate the required amount of keying 209b307be6SVernon Mauery * material. 219b307be6SVernon Mauery */ 229b307be6SVernon Mauery constexpr size_t CONST_N_SIZE = 20; 239b307be6SVernon Mauery using Const_n = std::array<uint8_t, CONST_N_SIZE>; 249b307be6SVernon Mauery 25*9e801a2bSVernon Mauery static constexpr Const_n const_1 = {0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 26*9e801a2bSVernon Mauery 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 27*9e801a2bSVernon Mauery 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}; 289b307be6SVernon Mauery 29*9e801a2bSVernon Mauery static constexpr Const_n const_2 = {0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 30*9e801a2bSVernon Mauery 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 31*9e801a2bSVernon Mauery 0x02, 0x02, 0x02, 0x02, 0x02, 0x02}; 329b307be6SVernon Mauery 339b307be6SVernon Mauery } // namespace rmcp 34