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98 lines
2.9 KiB
98 lines
2.9 KiB
5 months ago
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/*
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Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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Without limiting anything contained in the foregoing, this file,
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which is part of C Driver for MySQL (Connector/C), is also subject to the
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Universal FOSS Exception, version 1.0, a copy of which can be found at
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http://oss.oracle.com/licenses/universal-foss-exception.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/**
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@file mysys/my_rnd.cc
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*/
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#include "my_rnd.h"
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#include <mysql_com.h>
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#include <openssl/err.h>
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#include <openssl/rand.h>
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#if !defined(HAVE_OPENSSL)
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#error not using an SSL library not supported
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#endif
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/*
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A wrapper to use OpenSSL PRNGs.
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*/
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/**
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Generate random number.
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@param [in,out] rand_st Structure used for number generation.
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@retval Generated pseudo random number.
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*/
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double my_rnd(struct rand_struct *rand_st) {
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rand_st->seed1 = (rand_st->seed1 * 3 + rand_st->seed2) % rand_st->max_value;
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rand_st->seed2 = (rand_st->seed1 + rand_st->seed2 + 33) % rand_st->max_value;
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return (((double)rand_st->seed1) / rand_st->max_value_dbl);
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}
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/**
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Fill a buffer with random bytes using the SSL library routines
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@param [out] buffer Buffer to receive the random data
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@param [in] buffer_size sizeof the the buffer
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@retval 1 error occurred.
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@retval 0 OK
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*/
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int my_rand_buffer(unsigned char *buffer, size_t buffer_size) {
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int rc;
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rc = RAND_bytes(buffer, (int)buffer_size);
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if (!rc) {
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ERR_clear_error();
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return 1;
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}
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return 0;
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}
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/**
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Generate a random number using the OpenSSL supplied
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random number generator if available.
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@param [out] failed set to TRUE if the method failed. FALSE if OK.
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@retval Generated random number or 0 if failed is set.
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*/
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double my_rnd_ssl(bool *failed) {
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unsigned int res;
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if (my_rand_buffer((unsigned char *)&res, sizeof(res))) {
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*failed = true;
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return 0;
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} else
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*failed = false;
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return (double)res / (double)UINT_MAX;
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}
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