1 | /**
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2 | * \file entropy_poll.h
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3 | *
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4 | * \brief Platform-specific and custom entropy polling functions
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5 | */
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6 | /*
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7 | * Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
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8 | * SPDX-License-Identifier: Apache-2.0
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9 | *
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10 | * Licensed under the Apache License, Version 2.0 (the "License"); you may
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11 | * not use this file except in compliance with the License.
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12 | * You may obtain a copy of the License at
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13 | *
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14 | * http://www.apache.org/licenses/LICENSE-2.0
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15 | *
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16 | * Unless required by applicable law or agreed to in writing, software
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17 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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18 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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19 | * See the License for the specific language governing permissions and
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20 | * limitations under the License.
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21 | *
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22 | * This file is part of mbed TLS (https://tls.mbed.org)
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23 | */
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24 | #ifndef MBEDTLS_ENTROPY_POLL_H
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25 | #define MBEDTLS_ENTROPY_POLL_H
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26 |
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27 | #if !defined(MBEDTLS_CONFIG_FILE)
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28 | #include "config.h"
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29 | #else
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30 | #include MBEDTLS_CONFIG_FILE
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31 | #endif
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32 |
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33 | #include <stddef.h>
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34 |
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35 | #ifdef __cplusplus
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36 | extern "C" {
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37 | #endif
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38 |
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39 | /*
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40 | * Default thresholds for built-in sources, in bytes
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41 | */
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42 | #define MBEDTLS_ENTROPY_MIN_PLATFORM 32 /**< Minimum for platform source */
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43 | #define MBEDTLS_ENTROPY_MIN_HAVEGE 32 /**< Minimum for HAVEGE */
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44 | #define MBEDTLS_ENTROPY_MIN_HARDCLOCK 4 /**< Minimum for mbedtls_timing_hardclock() */
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45 | #if !defined(MBEDTLS_ENTROPY_MIN_HARDWARE)
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46 | #define MBEDTLS_ENTROPY_MIN_HARDWARE 32 /**< Minimum for the hardware source */
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47 | #endif
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48 |
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49 | /**
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50 | * \brief Entropy poll callback that provides 0 entropy.
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51 | */
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52 | #if defined(MBEDTLS_TEST_NULL_ENTROPY)
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53 | int mbedtls_null_entropy_poll( void *data,
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54 | unsigned char *output, size_t len, size_t *olen );
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55 | #endif
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56 |
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57 | #if !defined(MBEDTLS_NO_PLATFORM_ENTROPY)
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58 | /**
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59 | * \brief Platform-specific entropy poll callback
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60 | */
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61 | int mbedtls_platform_entropy_poll( void *data,
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62 | unsigned char *output, size_t len, size_t *olen );
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63 | #endif
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64 |
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65 | #if defined(MBEDTLS_HAVEGE_C)
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66 | /**
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67 | * \brief HAVEGE based entropy poll callback
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68 | *
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69 | * Requires an HAVEGE state as its data pointer.
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70 | */
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71 | int mbedtls_havege_poll( void *data,
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72 | unsigned char *output, size_t len, size_t *olen );
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73 | #endif
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74 |
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75 | #if defined(MBEDTLS_TIMING_C)
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76 | /**
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77 | * \brief mbedtls_timing_hardclock-based entropy poll callback
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78 | */
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79 | int mbedtls_hardclock_poll( void *data,
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80 | unsigned char *output, size_t len, size_t *olen );
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81 | #endif
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82 |
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83 | #if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)
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84 | /**
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85 | * \brief Entropy poll callback for a hardware source
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86 | *
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87 | * \warning This is not provided by mbed TLS!
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88 | * See \c MBEDTLS_ENTROPY_HARDWARE_ALT in config.h.
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89 | *
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90 | * \note This must accept NULL as its first argument.
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91 | */
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92 | int mbedtls_hardware_poll( void *data,
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93 | unsigned char *output, size_t len, size_t *olen );
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94 | #endif
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95 |
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96 | #if defined(MBEDTLS_ENTROPY_NV_SEED)
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97 | /**
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98 | * \brief Entropy poll callback for a non-volatile seed file
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99 | *
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100 | * \note This must accept NULL as its first argument.
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101 | */
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102 | int mbedtls_nv_seed_poll( void *data,
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103 | unsigned char *output, size_t len, size_t *olen );
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104 | #endif
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105 |
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106 | #ifdef __cplusplus
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107 | }
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108 | #endif
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109 |
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110 | #endif /* entropy_poll.h */
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