1 /* fips/rand/fips_drbg_rand.c */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 2011 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
54 #define OPENSSL_FIPSAPI
57 #include <openssl/crypto.h>
58 #include <openssl/evp.h>
59 #include <openssl/aes.h>
60 #include <openssl/err.h>
61 #include <openssl/rand.h>
62 #include <openssl/fips_rand.h>
63 #include "fips_rand_lcl.h"
65 /* Mapping of SP800-90 DRBGs to OpenSSL RAND_METHOD */
67 /* Since we only have one global PRNG used at any time in OpenSSL use a global
68 * variable to store context.
71 static DRBG_CTX ossl_dctx;
73 DRBG_CTX *FIPS_get_default_drbg(void)
78 static int fips_drbg_bytes(unsigned char *out, int count)
80 DRBG_CTX *dctx = &ossl_dctx;
82 unsigned char *adin = NULL;
84 CRYPTO_w_lock(CRYPTO_LOCK_RAND);
88 if (count > (int)dctx->max_request)
89 rcnt = dctx->max_request;
94 adinlen = dctx->get_adin(dctx, &adin);
97 FIPSerr(FIPS_F_FIPS_DRBG_BYTES, FIPS_R_ERROR_RETRIEVING_ADDITIONAL_INPUT);
101 rv = FIPS_drbg_generate(dctx, out, rcnt, 0, 0, adin, adinlen);
104 if (dctx->cleanup_adin)
105 dctx->cleanup_adin(dctx, adin, adinlen);
116 CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
120 static int fips_drbg_pseudo(unsigned char *out, int count)
122 if (fips_drbg_bytes(out, count) <= 0)
127 static int fips_drbg_status(void)
129 DRBG_CTX *dctx = &ossl_dctx;
131 CRYPTO_r_lock(CRYPTO_LOCK_RAND);
132 rv = dctx->status == DRBG_STATUS_READY ? 1 : 0;
133 CRYPTO_r_unlock(CRYPTO_LOCK_RAND);
137 static void fips_drbg_cleanup(void)
139 DRBG_CTX *dctx = &ossl_dctx;
140 CRYPTO_w_lock(CRYPTO_LOCK_RAND);
141 FIPS_drbg_uninstantiate(dctx);
142 CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
145 static int fips_drbg_seed(const void *seed, int seedlen)
147 DRBG_CTX *dctx = &ossl_dctx;
148 if (dctx->rand_seed_cb)
149 return dctx->rand_seed_cb(dctx, seed, seedlen);
153 static int fips_drbg_add(const void *seed, int seedlen,
156 DRBG_CTX *dctx = &ossl_dctx;
157 if (dctx->rand_add_cb)
158 return dctx->rand_add_cb(dctx, seed, seedlen, add_entropy);
162 static const RAND_METHOD rand_drbg_meth =
172 const RAND_METHOD *FIPS_drbg_method(void)
174 return &rand_drbg_meth;