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RAND_BYTES(3SSL) - Linux man page online | Library functions

Generate random data.

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2020-05-27
RAND_BYTES(3SSL) OpenSSL RAND_BYTES(3SSL)

NAME

RAND_bytes, RAND_priv_bytes, RAND_pseudo_bytes - generate random data

SYNOPSIS

#include <openssl/rand.h> int RAND_bytes(unsigned char *buf, int num); int RAND_priv_bytes(unsigned char *buf, int num); Deprecated: #if OPENSSL_API_COMPAT < 0x10100000L int RAND_pseudo_bytes(unsigned char *buf, int num); #endif

DESCRIPTION

RAND_bytes() puts num cryptographically strong pseudo-random bytes into buf. RAND_priv_bytes() has the same semantics as RAND_bytes(). It is intended to be used for generating values that should remain private. If using the default RAND_METHOD, this function uses a separate "private" PRNG instance so that a compromise of the "public" PRNG instance will not affect the secrecy of these private values, as described in RAND(7) and RAND_DRBG(7).

NOTES

Always check the error return value of RAND_bytes() and RAND_priv_bytes() and do not take randomness for granted: an error occurs if the CSPRNG has not been seeded with enough randomness to ensure an unpredictable byte sequence.

RETURN VALUES

RAND_bytes() and RAND_priv_bytes() return 1 on success, -1 if not supported by the current RAND method, or 0 on other failure. The error code can be obtained by ERR_get_error(3).

HISTORY

· RAND_pseudo_bytes() was deprecated in OpenSSL 1.1.0; use RAND_bytes() instead. · RAND_priv_bytes() was added in OpenSSL 1.1.1.

SEE ALSO

RAND_add(3), RAND_bytes(3), RAND_priv_bytes(3), ERR_get_error(3), RAND(7), RAND_DRBG(7)
Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>.
1.1.1 2020-05-27 RAND_BYTES(3SSL)
This manual Reference Other manuals
RAND_bytes(3ssl) referred by BN_generate_prime(3ssl) | BN_rand(3ssl) | Crypt::OpenSSL::Random(3pm) | DES_random_key(3ssl) | DH_generate_key(3ssl) | DH_generate_parameters(3ssl) | DSA_do_sign(3ssl) | DSA_generate_key(3ssl) | DSA_generate_parameters(3ssl) | DSA_sign(3ssl) | ENGINE_add(3ssl) | EVP_BytesToKey(3ssl) | EVP_OpenInit(3ssl) | EVP_SealInit(3ssl) | PKCS5_PBKDF2_HMAC(3ssl) | rand(1ssl) | RAND(7ssl) | RAND_add(3ssl) | RAND_DRBG(7ssl) | RAND_DRBG_generate(3ssl)
refer to ERR_get_error(3ssl) | RAND(7ssl) | RAND_add(3ssl) | RAND_DRBG(7ssl)
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Main page OpenSSL (+3845) 1.1.1 (+3849) № 3 (+68044)
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