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tfm_plat_boot_seed.h
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1 /*
2  * Copyright (c) 2018, Arm Limited. All rights reserved.
3  *
4  * SPDX-License-Identifier: BSD-3-Clause
5  *
6  */
7 
8 #ifndef __TFM_PLAT_BOOT_SEED_H__
9 #define __TFM_PLAT_BOOT_SEED_H__
10 /**
11  * \file tfm_plat_boot_seed.h
12  *
13  * Boot seed is used by a validating entity to ensure multiple reports were
14  * generated in the same boot session. Boot seed is a random number, generated
15  * only once during a boot cycle and its value is constant in the same cycle.
16  * Size recommendation is 256-bit to meet the statistically improbable property.
17  * Boot seed can be generated by secure boot loader an included to the measured
18  * boot state or can be generated by PRoT SW.
19  */
20 
21 /**
22  * \note The interfaces defined in this file must be implemented for each
23  * SoC.
24  */
25 
26 #include <stdint.h>
27 #include "tfm_plat_defs.h"
28 
29 #ifdef __cplusplus
30 extern "C" {
31 #endif
32 
33 /*!
34  * \def BOOT_SEED_SIZE
35  *
36  * \brief Size of boot seed in bytes.
37  */
38 #define BOOT_SEED_SIZE (32u)
39 
40 /**
41  * \brief Gets the boot seed, which is a constant random number during a boot
42  * cycle.
43  *
44  * \param[in] size The required size of boot seed in bytes
45  * \param[out] buf Pointer to the buffer to store boot seed
46  *
47  * \return TFM_PLAT_ERR_SUCCESS if the value is generated correctly. Otherwise,
48  * it returns TFM_PLAT_ERR_SYSTEM_ERR.
49  */
50 enum tfm_plat_err_t tfm_plat_get_boot_seed(uint32_t size, uint8_t *buf);
51 
52 #ifdef __cplusplus
53 }
54 #endif
55 
56 #endif /* __TFM_PLAT_BOOT_SEED_H__ */
tfm_plat_get_boot_seed
enum tfm_plat_err_t tfm_plat_get_boot_seed(uint32_t size, uint8_t *buf)
Gets the boot seed, which is a constant random number during a boot cycle.
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