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 includes definitions for performing AES-ECB computations.
32  */
33 
34 #ifndef AES_ECB_HPP_
35 #define AES_ECB_HPP_
36 
37 #include "openthread-core-config.h"
38 
39 #include <openthread/platform/crypto.h>
40 
41 #include "common/code_utils.hpp"
42 #include "crypto/context_size.hpp"
43 #include "crypto/storage.hpp"
44 
45 namespace ot {
46 namespace Crypto {
47 
48 /**
49  * @addtogroup core-security
50  *
51  * @{
52  *
53  */
54 
55 /**
56  * Implements AES ECB computation.
57  *
58  */
59 class AesEcb
60 {
61 public:
62     static constexpr uint8_t kBlockSize = 16; ///< AES-128 block size (bytes).
63 
64     /**
65      * Constructor to initialize the AES operation.
66      *
67      */
68     AesEcb(void);
69 
70     /**
71      * Destructor to free the AES context.
72      *
73      */
74     ~AesEcb(void);
75 
76     /**
77      * Sets the key.
78      *
79      * @param[in]  aKey     Crypto Key used for ECB operation
80      *
81      */
82     void SetKey(const Key &aKey);
83 
84     /**
85      * Encrypts data.
86      *
87      * @param[in]   aInput   A pointer to the input buffer.
88      * @param[out]  aOutput  A pointer to the output buffer.
89      *
90      */
91     void Encrypt(const uint8_t aInput[kBlockSize], uint8_t aOutput[kBlockSize]);
92 
93 private:
94     otCryptoContext mContext;
95     OT_DEFINE_ALIGNED_VAR(mContextStorage, kAesContextSize, uint64_t);
96 };
97 
98 /**
99  * @}
100  *
101  */
102 
103 } // namespace Crypto
104 } // namespace ot
105 
106 #endif // AES_ECB_HPP_
107