1 | /*
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2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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3 | *
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4 | * Licensed under the OpenSSL license (the "License"). You may not use
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5 | * this file except in compliance with the License. You can obtain a copy
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6 | * in the file LICENSE in the source distribution or at
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7 | * https://www.openssl.org/source/license.html
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8 | */
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9 |
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10 | #include <stdio.h>
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11 | #include <time.h>
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12 | #include "internal/cryptlib.h"
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13 | #include <openssl/opensslconf.h>
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14 | #include "internal/rand.h"
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15 |
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16 | #include <openssl/engine.h>
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17 |
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18 | #ifdef OPENSSL_FIPS
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19 | # include <openssl/fips.h>
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20 | # include <openssl/fips_rand.h>
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21 | #endif
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22 |
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23 | #ifndef OPENSSL_NO_ENGINE
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24 | /* non-NULL if default_RAND_meth is ENGINE-provided */
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25 | static ENGINE *funct_ref = NULL;
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26 | #endif
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27 | static const RAND_METHOD *default_RAND_meth = NULL;
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28 |
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29 | int RAND_set_rand_method(const RAND_METHOD *meth)
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30 | {
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31 | #ifndef OPENSSL_NO_ENGINE
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32 | ENGINE_finish(funct_ref);
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33 | funct_ref = NULL;
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34 | #endif
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35 | default_RAND_meth = meth;
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36 | return 1;
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37 | }
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38 |
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39 | const RAND_METHOD *RAND_get_rand_method(void)
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40 | {
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41 | if (!default_RAND_meth) {
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42 | #ifndef OPENSSL_NO_ENGINE
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43 | ENGINE *e = ENGINE_get_default_RAND();
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44 | if (e) {
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45 | default_RAND_meth = ENGINE_get_RAND(e);
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46 | if (default_RAND_meth == NULL) {
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47 | ENGINE_finish(e);
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48 | e = NULL;
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49 | }
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50 | }
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51 | if (e)
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52 | funct_ref = e;
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53 | else
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54 | #endif
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55 | default_RAND_meth = RAND_OpenSSL();
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56 | }
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57 | return default_RAND_meth;
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58 | }
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59 |
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60 | #ifndef OPENSSL_NO_ENGINE
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61 | int RAND_set_rand_engine(ENGINE *engine)
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62 | {
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63 | const RAND_METHOD *tmp_meth = NULL;
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64 | if (engine) {
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65 | if (!ENGINE_init(engine))
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66 | return 0;
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67 | tmp_meth = ENGINE_get_RAND(engine);
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68 | if (tmp_meth == NULL) {
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69 | ENGINE_finish(engine);
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70 | return 0;
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71 | }
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72 | }
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73 | /* This function releases any prior ENGINE so call it first */
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74 | RAND_set_rand_method(tmp_meth);
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75 | funct_ref = engine;
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76 | return 1;
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77 | }
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78 | #endif
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79 |
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80 | void rand_cleanup_int(void)
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81 | {
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82 | const RAND_METHOD *meth = RAND_get_rand_method();
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83 | if (meth && meth->cleanup)
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84 | meth->cleanup();
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85 | RAND_set_rand_method(NULL);
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86 | }
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87 |
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88 | void RAND_seed(const void *buf, int num)
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89 | {
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90 | const RAND_METHOD *meth = RAND_get_rand_method();
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91 | if (meth && meth->seed)
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92 | meth->seed(buf, num);
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93 | }
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94 |
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95 | void RAND_add(const void *buf, int num, double entropy)
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96 | {
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97 | const RAND_METHOD *meth = RAND_get_rand_method();
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98 | if (meth && meth->add)
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99 | meth->add(buf, num, entropy);
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100 | }
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101 |
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102 | int RAND_bytes(unsigned char *buf, int num)
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103 | {
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104 | const RAND_METHOD *meth = RAND_get_rand_method();
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105 | if (meth && meth->bytes)
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106 | return meth->bytes(buf, num);
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107 | return (-1);
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108 | }
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109 |
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110 | #if OPENSSL_API_COMPAT < 0x10100000L
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111 | int RAND_pseudo_bytes(unsigned char *buf, int num)
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112 | {
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113 | const RAND_METHOD *meth = RAND_get_rand_method();
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114 | if (meth && meth->pseudorand)
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115 | return meth->pseudorand(buf, num);
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116 | return (-1);
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117 | }
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118 | #endif
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119 |
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120 | int RAND_status(void)
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121 | {
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122 | const RAND_METHOD *meth = RAND_get_rand_method();
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123 | if (meth && meth->status)
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124 | return meth->status();
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125 | return 0;
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126 | }
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