[331] | 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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