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/* ====================================================================
* Copyright (c) 2011 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#define OPENSSL_FIPSAPI
#include <openssl/crypto.h>
#include <openssl/rand.h>
#include <openssl/err.h>
#include <openssl/fips.h>
#include <openssl/fips_rand.h>
#include "e_os.h"
/* FIPS API for PRNG use. Similar to RAND functionality but without
* ENGINE and additional checking for non-FIPS rand methods.
*/
static const RAND_METHOD *fips_rand_meth = NULL;
static int fips_approved_rand_meth = 0;
static int fips_rand_bits = 0;
/* Allows application to override number of bits and uses non-FIPS methods */
void FIPS_rand_set_bits(int nbits)
{
fips_rand_bits = nbits;
}
int FIPS_rand_set_method(const RAND_METHOD *meth)
{
if (!fips_rand_bits)
{
if (meth == FIPS_drbg_method())
fips_approved_rand_meth = 1;
else if (meth == FIPS_x931_method())
fips_approved_rand_meth = 2;
else
{
fips_approved_rand_meth = 0;
if (FIPS_module_mode())
{
FIPSerr(FIPS_F_FIPS_RAND_SET_METHOD,
FIPS_R_NON_FIPS_METHOD);
return 0;
}
}
}
fips_rand_meth = meth;
return 1;
}
const RAND_METHOD *FIPS_rand_get_method(void)
{
return fips_rand_meth;
}
void FIPS_rand_seed(const void *buf, int num)
{
if (!fips_approved_rand_meth && FIPS_module_mode())
{
FIPSerr(FIPS_F_FIPS_RAND_SEED, FIPS_R_NON_FIPS_METHOD);
return;
}
if (fips_rand_meth && fips_rand_meth->seed)
fips_rand_meth->seed(buf,num);
}
void FIPS_rand_add(const void *buf, int num, double entropy)
{
if (!fips_approved_rand_meth && FIPS_module_mode())
{
FIPSerr(FIPS_F_FIPS_RAND_ADD, FIPS_R_NON_FIPS_METHOD);
return;
}
if (fips_rand_meth && fips_rand_meth->add)
fips_rand_meth->add(buf,num,entropy);
}
int FIPS_rand_bytes(unsigned char *buf, int num)
{
if (!fips_approved_rand_meth && FIPS_module_mode())
{
FIPSerr(FIPS_F_FIPS_RAND_BYTES, FIPS_R_NON_FIPS_METHOD);
return 0;
}
if (fips_rand_meth && fips_rand_meth->bytes)
return fips_rand_meth->bytes(buf,num);
return 0;
}
int FIPS_rand_pseudo_bytes(unsigned char *buf, int num)
{
if (!fips_approved_rand_meth && FIPS_module_mode())
{
FIPSerr(FIPS_F_FIPS_RAND_PSEUDO_BYTES, FIPS_R_NON_FIPS_METHOD);
return 0;
}
if (fips_rand_meth && fips_rand_meth->pseudorand)
return fips_rand_meth->pseudorand(buf,num);
return -1;
}
int FIPS_rand_status(void)
{
if (!fips_approved_rand_meth && FIPS_module_mode())
{
FIPSerr(FIPS_F_FIPS_RAND_STATUS, FIPS_R_NON_FIPS_METHOD);
return 0;
}
if (fips_rand_meth && fips_rand_meth->status)
return fips_rand_meth->status();
return 0;
}
/* Return instantiated strength of PRNG. For DRBG this is an internal
* parameter. For X9.31 PRNG it is 80 bits (from SP800-131). Any other
* type of PRNG is not approved and returns 0 in FIPS mode and maximum
* 256 outside FIPS mode.
*/
int FIPS_rand_strength(void)
{
if (fips_rand_bits)
return fips_rand_bits;
if (fips_approved_rand_meth == 1)
return FIPS_drbg_get_strength(FIPS_get_default_drbg());
else if (fips_approved_rand_meth == 2)
return 80;
else if (fips_approved_rand_meth == 0)
{
if (FIPS_module_mode())
return 0;
else
return 256;
}
return 0;
}
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