1 /*
2 * Copyright (c) 2020, The OpenThread Authors.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. Neither the name of the copyright holder nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 /**
30 * @file
31 * This file implements HMAC-based Extract-and-Expand Key Derivation Function (HKDF) using SHA-256.
32 */
33
34 #include "hkdf_sha256.hpp"
35
36 #include <string.h>
37
38 #include "common/code_utils.hpp"
39 #include "common/debug.hpp"
40 #include "common/error.hpp"
41 #include "openthread/platform/crypto.h"
42
43 namespace ot {
44 namespace Crypto {
45
HkdfSha256(void)46 HkdfSha256::HkdfSha256(void)
47 {
48 mContext.mContext = mContextStorage;
49 mContext.mContextSize = sizeof(mContextStorage);
50 SuccessOrAssert(otPlatCryptoHkdfInit(&mContext));
51 }
52
~HkdfSha256(void)53 HkdfSha256::~HkdfSha256(void) { SuccessOrAssert(otPlatCryptoHkdfDeinit(&mContext)); }
54
Extract(const uint8_t * aSalt,uint16_t aSaltLength,const Key & aInputKey)55 void HkdfSha256::Extract(const uint8_t *aSalt, uint16_t aSaltLength, const Key &aInputKey)
56 {
57 SuccessOrAssert(otPlatCryptoHkdfExtract(&mContext, aSalt, aSaltLength, &aInputKey));
58 }
59
Expand(const uint8_t * aInfo,uint16_t aInfoLength,uint8_t * aOutputKey,uint16_t aOutputKeyLength)60 void HkdfSha256::Expand(const uint8_t *aInfo, uint16_t aInfoLength, uint8_t *aOutputKey, uint16_t aOutputKeyLength)
61 {
62 SuccessOrAssert(otPlatCryptoHkdfExpand(&mContext, aInfo, aInfoLength, aOutputKey, aOutputKeyLength));
63 }
64
65 } // namespace Crypto
66 } // namespace ot
67
