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/*
Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.
Without limiting anything contained in the foregoing, this file,
which is part of C Driver for MySQL (Connector/C), is also subject to the
Universal FOSS Exception, version 1.0, a copy of which can be found at
http://oss.oracle.com/licenses/universal-foss-exception.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/**
@file mysys/my_rnd.cc
*/
#include "my_rnd.h"
#include <openssl/err.h>
#include <openssl/rand.h>
#if !defined(HAVE_OPENSSL)
#error not using an SSL library not supported
#endif
/*
A wrapper to use OpenSSL/wolfSSL PRNGs.
*/
/**
Generate random number.
@param [in,out] rand_st Structure used for number generation.
@retval Generated pseudo random number.
*/
double my_rnd(struct rand_struct *rand_st) {
rand_st->seed1 = (rand_st->seed1 * 3 + rand_st->seed2) % rand_st->max_value;
rand_st->seed2 = (rand_st->seed1 + rand_st->seed2 + 33) % rand_st->max_value;
return (((double)rand_st->seed1) / rand_st->max_value_dbl);
}
/**
Fill a buffer with random bytes using the SSL library routines
@param [out] buffer Buffer to receive the random data
@param [in] buffer_size sizeof the the buffer
@retval 1 error occurred.
@retval 0 OK
*/
int my_rand_buffer(unsigned char *buffer, size_t buffer_size) {
int rc;
rc = RAND_bytes(buffer, (int)buffer_size);
if (!rc) {
ERR_clear_error();
return 1;
}
return 0;
}
/**
Generate a random number using the OpenSSL/wolfSSL supplied
random number generator if available.
@param [in,out] rand_st Structure used for number generation
only if none of the SSL libraries are
available.
@retval Generated random number.
*/
double my_rnd_ssl(struct rand_struct *rand_st) {
unsigned int res;
if (my_rand_buffer((unsigned char *)&res, sizeof(res)))
return my_rnd(rand_st);
return (double)res / (double)UINT_MAX;
}
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