| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #pragma once |
| |
| #include <array> |
| |
| namespace bluetooth { |
| namespace crypto_toolbox { |
| |
| constexpr int OCTET16_LEN = 16; |
| using Octet16 = std::array<uint8_t, OCTET16_LEN>; |
| |
| Octet16 c1(const Octet16& k, const Octet16& r, const uint8_t* pres, const uint8_t* preq, const uint8_t iat, |
| const uint8_t* ia, const uint8_t rat, const uint8_t* ra); |
| Octet16 s1(const Octet16& k, const Octet16& r1, const Octet16& r2); |
| |
| extern Octet16 aes_128(const Octet16& key, const Octet16& message); |
| extern Octet16 aes_cmac(const Octet16& key, const uint8_t* message, uint16_t length); |
| extern Octet16 f4(uint8_t* u, uint8_t* v, const Octet16& x, uint8_t z); |
| extern void f5(uint8_t* w, const Octet16& n1, const Octet16& n2, uint8_t* a1, uint8_t* a2, Octet16* mac_key, |
| Octet16* ltk); |
| extern Octet16 f6(const Octet16& w, const Octet16& n1, const Octet16& n2, const Octet16& r, uint8_t* iocap, uint8_t* a1, |
| uint8_t* a2); |
| extern Octet16 h6(const Octet16& w, std::array<uint8_t, 4> keyid); |
| extern Octet16 h7(const Octet16& salt, const Octet16& w); |
| extern uint32_t g2(uint8_t* u, uint8_t* v, const Octet16& x, const Octet16& y); |
| extern Octet16 ltk_to_link_key(const Octet16& ltk, bool use_h7); |
| extern Octet16 link_key_to_ltk(const Octet16& link_key, bool use_h7); |
| |
| /* This function computes AES_128(key, message). |key| must be 128bit. |
| * |message| can be at most 16 bytes long, it's length in bytes is given in |
| * |length| */ |
| inline Octet16 aes_128(const Octet16& key, const uint8_t* message, const uint8_t length) { |
| // CHECK(length <= OCTET16_LEN) << "you tried aes_128 more than 16 bytes!"; |
| Octet16 msg{0}; |
| std::copy(message, message + length, msg.begin()); |
| return aes_128(key, msg); |
| } |
| |
| // |tlen| - lenth of mac desired |
| // |p_signature| - data pointer to where signed data to be stored, tlen long. |
| inline void aes_cmac(const Octet16& key, const uint8_t* message, uint16_t length, uint16_t tlen, uint8_t* p_signature) { |
| Octet16 signature = aes_cmac(key, message, length); |
| |
| uint8_t* p_mac = signature.data() + (OCTET16_LEN - tlen); |
| memcpy(p_signature, p_mac, tlen); |
| } |
| |
| inline Octet16 aes_cmac(const Octet16& key, const Octet16& message) { |
| return aes_cmac(key, message.data(), message.size()); |
| } |
| |
| } // namespace crypto_toolbox |
| } // namespace bluetooth |