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/*
Copyright (c) 2012, 2014, 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 as published by
the Free Software Foundation; version 2 of the License.
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 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 */
#include <my_rnd.h>
#if defined(HAVE_YASSL)
#if defined(YASSL_PREFIX)
#define RAND_bytes yaRAND_bytes
#endif /* YASSL_PREFIX */
#include <openssl/ssl.h>
#elif defined(HAVE_OPENSSL)
#include <openssl/rand.h>
#include <openssl/err.h>
#endif /* HAVE_YASSL */
/*
A wrapper to use OpenSSL/yaSSL PRNGs.
*/
#ifdef __cplusplus
extern "C" {
#endif
/**
Generate random number.
@param rand_st [INOUT] 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 buffer [OUT] Buffer to receive the random data
@param buffer_size [IN] sizeof the the buffer
@retval 1 error ocurred.
@retval 0 OK
*/
int
my_rand_buffer(unsigned char *buffer, size_t buffer_size)
{
int rc;
#if defined(HAVE_YASSL) /* YaSSL */
rc= yaSSL::RAND_bytes(buffer, buffer_size);
if (!rc)
return 1;
#elif defined(HAVE_OPENSSL)
rc= RAND_bytes(buffer, buffer_size);
if (!rc)
{
ERR_clear_error();
return 1;
}
#else /* no SSL */
#error not using an SSL library not supported
#endif
return 0;
}
/**
Generate a random number using the OpenSSL/yaSSL supplied
random number generator if available.
@param rand_st [INOUT] 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;
}
#ifdef __cplusplus
}
#endif
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