1 /*
2 * Copyright (c) 2016, 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
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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 SHA-256.
32 */
33
34 #include "sha256.hpp"
35
36 #include "common/message.hpp"
37
38 namespace ot {
39 namespace Crypto {
40
Sha256(void)41 Sha256::Sha256(void)
42 {
43 mbedtls_sha256_init(&mContext);
44 }
45
~Sha256(void)46 Sha256::~Sha256(void)
47 {
48 mbedtls_sha256_free(&mContext);
49 }
50
Start(void)51 void Sha256::Start(void)
52 {
53 mbedtls_sha256_starts_ret(&mContext, 0);
54 }
55
Update(const void * aBuf,uint16_t aBufLength)56 void Sha256::Update(const void *aBuf, uint16_t aBufLength)
57 {
58 mbedtls_sha256_update_ret(&mContext, reinterpret_cast<const uint8_t *>(aBuf), aBufLength);
59 }
60
Update(const Message & aMessage,uint16_t aOffset,uint16_t aLength)61 void Sha256::Update(const Message &aMessage, uint16_t aOffset, uint16_t aLength)
62 {
63 Message::Chunk chunk;
64
65 aMessage.GetFirstChunk(aOffset, aLength, chunk);
66
67 while (chunk.GetLength() > 0)
68 {
69 Update(chunk.GetData(), chunk.GetLength());
70 aMessage.GetNextChunk(aLength, chunk);
71 }
72 }
73
Finish(Hash & aHash)74 void Sha256::Finish(Hash &aHash)
75 {
76 mbedtls_sha256_finish_ret(&mContext, aHash.m8);
77 }
78
79 } // namespace Crypto
80 } // namespace ot
81
