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
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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 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 <mbedtls/aes.h>
40 
41 namespace ot {
42 namespace Crypto {
43 
44 /**
45  * @addtogroup core-security
46  *
47  * @{
48  *
49  */
50 
51 /**
52  * This class implements AES ECB computation.
53  *
54  */
55 class AesEcb
56 {
57 public:
58     static constexpr uint8_t kBlockSize = 16; ///< AES-128 block size (bytes).
59 
60     /**
61      * Constructor to initialize the mbedtls_aes_context.
62      *
63      */
64     AesEcb(void);
65 
66     /**
67      * Destructor to free the mbedtls_aes_context.
68      *
69      */
70     ~AesEcb(void);
71 
72     /**
73      * This method sets the key.
74      *
75      * @param[in]  aKey        A pointer to the key.
76      * @param[in]  aKeyLength  The key length in bits.
77      *
78      */
79     void SetKey(const uint8_t *aKey, uint16_t aKeyLength);
80 
81     /**
82      * This method encrypts data.
83      *
84      * @param[in]   aInput   A pointer to the input buffer.
85      * @param[out]  aOutput  A pointer to the output buffer.
86      *
87      */
88     void Encrypt(const uint8_t aInput[kBlockSize], uint8_t aOutput[kBlockSize]);
89 
90 private:
91     mbedtls_aes_context mContext;
92 };
93 
94 /**
95  * @}
96  *
97  */
98 
99 } // namespace Crypto
100 } // namespace ot
101 
102 #endif // AES_ECB_HPP_
103