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