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de2132de93
(strength can be queried using FIPS_drbg_get_strength ) and adds a substantial extra overhead to health check (need to check every combination of parameters).
175 lines
4.9 KiB
C
175 lines
4.9 KiB
C
/* fips/rand/fips_drbg_rand.c */
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/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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* project.
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*/
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/* ====================================================================
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* Copyright (c) 2011 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*/
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#define OPENSSL_FIPSAPI
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#include <string.h>
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#include <openssl/crypto.h>
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#include <openssl/err.h>
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#include <openssl/rand.h>
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#include <openssl/fips_rand.h>
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#include "fips_rand_lcl.h"
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/* Mapping of SP800-90 DRBGs to OpenSSL RAND_METHOD */
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/* Since we only have one global PRNG used at any time in OpenSSL use a global
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* variable to store context.
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*/
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static DRBG_CTX ossl_dctx;
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DRBG_CTX *FIPS_get_default_drbg(void)
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{
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return &ossl_dctx;
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}
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static int fips_drbg_bytes(unsigned char *out, int count)
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{
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DRBG_CTX *dctx = &ossl_dctx;
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int rv = 0;
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unsigned char *adin = NULL;
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size_t adinlen = 0;
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CRYPTO_w_lock(CRYPTO_LOCK_RAND);
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do
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{
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size_t rcnt;
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if (count > (int)dctx->max_request)
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rcnt = dctx->max_request;
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else
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rcnt = count;
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if (dctx->get_adin)
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{
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adinlen = dctx->get_adin(dctx, &adin);
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if (adinlen && !adin)
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{
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FIPSerr(FIPS_F_FIPS_DRBG_BYTES, FIPS_R_ERROR_RETRIEVING_ADDITIONAL_INPUT);
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goto err;
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}
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}
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rv = FIPS_drbg_generate(dctx, out, rcnt, 0, adin, adinlen);
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if (adin)
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{
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if (dctx->cleanup_adin)
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dctx->cleanup_adin(dctx, adin, adinlen);
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adin = NULL;
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}
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if (!rv)
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goto err;
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out += rcnt;
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count -= rcnt;
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}
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while (count);
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rv = 1;
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err:
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CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
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return rv;
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}
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static int fips_drbg_pseudo(unsigned char *out, int count)
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{
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if (fips_drbg_bytes(out, count) <= 0)
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return -1;
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return 1;
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}
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static int fips_drbg_status(void)
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{
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DRBG_CTX *dctx = &ossl_dctx;
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int rv;
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CRYPTO_r_lock(CRYPTO_LOCK_RAND);
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rv = dctx->status == DRBG_STATUS_READY ? 1 : 0;
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CRYPTO_r_unlock(CRYPTO_LOCK_RAND);
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return rv;
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}
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static void fips_drbg_cleanup(void)
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{
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DRBG_CTX *dctx = &ossl_dctx;
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CRYPTO_w_lock(CRYPTO_LOCK_RAND);
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FIPS_drbg_uninstantiate(dctx);
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CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
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}
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static int fips_drbg_seed(const void *seed, int seedlen)
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{
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DRBG_CTX *dctx = &ossl_dctx;
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if (dctx->rand_seed_cb)
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return dctx->rand_seed_cb(dctx, seed, seedlen);
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return 1;
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}
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static int fips_drbg_add(const void *seed, int seedlen,
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double add_entropy)
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{
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DRBG_CTX *dctx = &ossl_dctx;
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if (dctx->rand_add_cb)
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return dctx->rand_add_cb(dctx, seed, seedlen, add_entropy);
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return 1;
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}
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static const RAND_METHOD rand_drbg_meth =
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{
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fips_drbg_seed,
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fips_drbg_bytes,
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fips_drbg_cleanup,
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fips_drbg_add,
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fips_drbg_pseudo,
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fips_drbg_status
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};
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const RAND_METHOD *FIPS_drbg_method(void)
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{
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return &rand_drbg_meth;
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}
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