2 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #ifndef OPENSSL_RAND_H
11 # define OPENSSL_RAND_H
14 # include <openssl/macros.h>
15 # ifndef OPENSSL_NO_DEPRECATED_3_0
16 # define HEADER_RAND_H
20 # include <openssl/types.h>
21 # include <openssl/e_os2.h>
22 # include <openssl/randerr.h>
23 # include <openssl/evp.h>
30 * Default security strength (in the sense of [NIST SP 800-90Ar1])
32 * NIST SP 800-90Ar1 supports the strength of the DRBG being smaller than that
33 * of the cipher by collecting less entropy. The current DRBG implementation
34 * does not take RAND_DRBG_STRENGTH into account and sets the strength of the
35 * DRBG to that of the cipher.
37 # define RAND_DRBG_STRENGTH 256
39 # ifndef OPENSSL_NO_DEPRECATED_3_0
41 int (*seed) (const void *buf, int num);
42 int (*bytes) (unsigned char *buf, int num);
43 void (*cleanup) (void);
44 int (*add) (const void *buf, int num, double randomness);
45 int (*pseudorand) (unsigned char *buf, int num);
49 OSSL_DEPRECATEDIN_3_0 int RAND_set_rand_method(const RAND_METHOD *meth);
50 OSSL_DEPRECATEDIN_3_0 const RAND_METHOD *RAND_get_rand_method(void);
51 # ifndef OPENSSL_NO_ENGINE
52 OSSL_DEPRECATEDIN_3_0 int RAND_set_rand_engine(ENGINE *engine);
55 OSSL_DEPRECATEDIN_3_0 RAND_METHOD *RAND_OpenSSL(void);
56 # endif /* OPENSSL_NO_DEPRECATED_3_0 */
58 # ifndef OPENSSL_NO_DEPRECATED_1_1_0
59 # define RAND_cleanup() while(0) continue
61 int RAND_bytes(unsigned char *buf, int num);
62 int RAND_priv_bytes(unsigned char *buf, int num);
65 * Equivalent of RAND_priv_bytes() but additionally taking an OSSL_LIB_CTX and
68 int RAND_priv_bytes_ex(OSSL_LIB_CTX *ctx, unsigned char *buf, size_t num,
69 unsigned int strength);
72 * Equivalent of RAND_bytes() but additionally taking an OSSL_LIB_CTX and
75 int RAND_bytes_ex(OSSL_LIB_CTX *ctx, unsigned char *buf, size_t num,
76 unsigned int strength);
78 # ifndef OPENSSL_NO_DEPRECATED_1_1_0
79 OSSL_DEPRECATEDIN_1_1_0 int RAND_pseudo_bytes(unsigned char *buf, int num);
82 EVP_RAND_CTX *RAND_get0_primary(OSSL_LIB_CTX *ctx);
83 EVP_RAND_CTX *RAND_get0_public(OSSL_LIB_CTX *ctx);
84 EVP_RAND_CTX *RAND_get0_private(OSSL_LIB_CTX *ctx);
86 int RAND_set_DRBG_type(OSSL_LIB_CTX *ctx, const char *drbg, const char *propq,
87 const char *cipher, const char *digest);
88 int RAND_set_seed_source_type(OSSL_LIB_CTX *ctx, const char *seed,
91 void RAND_seed(const void *buf, int num);
92 void RAND_keep_random_devices_open(int keep);
94 # if defined(__ANDROID__) && defined(__NDK_FPABI__)
95 __NDK_FPABI__ /* __attribute__((pcs("aapcs"))) on ARM */
97 void RAND_add(const void *buf, int num, double randomness);
98 int RAND_load_file(const char *file, long max_bytes);
99 int RAND_write_file(const char *file);
100 const char *RAND_file_name(char *file, size_t num);
101 int RAND_status(void);
103 # ifndef OPENSSL_NO_EGD
104 int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes);
105 int RAND_egd(const char *path);
106 int RAND_egd_bytes(const char *path, int bytes);
111 # if defined(_WIN32) && (defined(BASETYPES) || defined(_WINDEF_H))
112 /* application has to include <windows.h> in order to use these */
113 # ifndef OPENSSL_NO_DEPRECATED_1_1_0
114 OSSL_DEPRECATEDIN_1_1_0 void RAND_screen(void);
115 OSSL_DEPRECATEDIN_1_1_0 int RAND_event(UINT, WPARAM, LPARAM);