411 lines
10 KiB
C
411 lines
10 KiB
C
/* ====================================================================
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* Copyright (c) 2007 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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* openssl-core@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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/*
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* This is a FIPS approved AES PRNG based on ANSI X9.31 A.2.4.
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*/
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#include "e_os.h"
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/* If we don't define _XOPEN_SOURCE_EXTENDED, struct timeval won't
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be defined and gettimeofday() won't be declared with strict compilers
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like DEC C in ANSI C mode. */
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#ifndef _XOPEN_SOURCE_EXTENDED
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#define _XOPEN_SOURCE_EXTENDED 1
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#endif
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#include <openssl/rand.h>
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#include <openssl/aes.h>
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#include <openssl/err.h>
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#include <openssl/fips_rand.h>
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#ifndef OPENSSL_SYS_WIN32
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#include <sys/time.h>
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#endif
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#include <assert.h>
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#ifndef OPENSSL_SYS_WIN32
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# ifdef OPENSSL_UNISTD
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# include OPENSSL_UNISTD
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# else
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# include <unistd.h>
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# endif
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#endif
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#include <string.h>
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#include <openssl/fips.h>
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#include "fips_locl.h"
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#ifdef OPENSSL_FIPS
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void *OPENSSL_stderr(void);
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#define AES_BLOCK_LENGTH 16
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/* AES FIPS PRNG implementation */
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typedef struct
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{
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int seeded;
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int keyed;
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int test_mode;
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int second;
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int error;
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unsigned long counter;
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AES_KEY ks;
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int vpos;
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/* Temporary storage for key if it equals seed length */
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unsigned char tmp_key[AES_BLOCK_LENGTH];
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unsigned char V[AES_BLOCK_LENGTH];
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unsigned char DT[AES_BLOCK_LENGTH];
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unsigned char last[AES_BLOCK_LENGTH];
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} FIPS_PRNG_CTX;
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static FIPS_PRNG_CTX sctx;
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static int fips_prng_fail = 0;
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void FIPS_rng_stick(void)
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{
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fips_prng_fail = 1;
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}
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static void fips_rand_prng_reset(FIPS_PRNG_CTX *ctx)
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{
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ctx->seeded = 0;
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ctx->keyed = 0;
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ctx->test_mode = 0;
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ctx->counter = 0;
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ctx->second = 0;
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ctx->error = 0;
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ctx->vpos = 0;
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OPENSSL_cleanse(ctx->V, AES_BLOCK_LENGTH);
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OPENSSL_cleanse(&ctx->ks, sizeof(AES_KEY));
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}
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static int fips_set_prng_key(FIPS_PRNG_CTX *ctx,
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const unsigned char *key, FIPS_RAND_SIZE_T keylen)
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{
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FIPS_selftest_check();
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if (keylen != 16 && keylen != 24 && keylen != 32)
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{
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/* error: invalid key size */
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return 0;
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}
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AES_set_encrypt_key(key, keylen << 3, &ctx->ks);
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if (keylen == 16)
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{
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memcpy(ctx->tmp_key, key, 16);
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ctx->keyed = 2;
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}
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else
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ctx->keyed = 1;
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ctx->seeded = 0;
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ctx->second = 0;
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return 1;
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}
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static int fips_set_prng_seed(FIPS_PRNG_CTX *ctx,
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const unsigned char *seed, FIPS_RAND_SIZE_T seedlen)
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{
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int i;
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if (!ctx->keyed)
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return 0;
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/* In test mode seed is just supplied data */
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if (ctx->test_mode)
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{
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if (seedlen != AES_BLOCK_LENGTH)
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return 0;
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memcpy(ctx->V, seed, AES_BLOCK_LENGTH);
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ctx->seeded = 1;
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return 1;
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}
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/* Outside test mode XOR supplied data with existing seed */
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for (i = 0; i < seedlen; i++)
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{
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ctx->V[ctx->vpos++] ^= seed[i];
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if (ctx->vpos == AES_BLOCK_LENGTH)
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{
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ctx->vpos = 0;
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/* Special case if first seed and key length equals
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* block size check key and seed do not match.
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*/
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if (ctx->keyed == 2)
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{
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if (!memcmp(ctx->tmp_key, ctx->V, 16))
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{
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RANDerr(RAND_F_FIPS_SET_PRNG_SEED,
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RAND_R_PRNG_SEED_MUST_NOT_MATCH_KEY);
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return 0;
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}
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OPENSSL_cleanse(ctx->tmp_key, 16);
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ctx->keyed = 1;
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}
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ctx->seeded = 1;
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}
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}
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return 1;
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}
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static int fips_set_test_mode(FIPS_PRNG_CTX *ctx)
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{
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if (ctx->keyed)
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{
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RANDerr(RAND_F_FIPS_SET_TEST_MODE,RAND_R_PRNG_KEYED);
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return 0;
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}
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ctx->test_mode = 1;
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return 1;
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}
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int FIPS_rand_test_mode(void)
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{
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return fips_set_test_mode(&sctx);
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}
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int FIPS_rand_set_dt(unsigned char *dt)
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{
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if (!sctx.test_mode)
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{
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RANDerr(RAND_F_FIPS_RAND_SET_DT,RAND_R_NOT_IN_TEST_MODE);
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return 0;
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}
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memcpy(sctx.DT, dt, AES_BLOCK_LENGTH);
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return 1;
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}
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static void fips_get_dt(FIPS_PRNG_CTX *ctx)
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{
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#ifdef OPENSSL_SYS_WIN32
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FILETIME ft;
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#else
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struct timeval tv;
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#endif
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unsigned char *buf = ctx->DT;
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#ifndef GETPID_IS_MEANINGLESS
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unsigned long pid;
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#endif
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#ifdef OPENSSL_SYS_WIN32
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GetSystemTimeAsFileTime(&ft);
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buf[0] = (unsigned char) (ft.dwHighDateTime & 0xff);
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buf[1] = (unsigned char) ((ft.dwHighDateTime >> 8) & 0xff);
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buf[2] = (unsigned char) ((ft.dwHighDateTime >> 16) & 0xff);
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buf[3] = (unsigned char) ((ft.dwHighDateTime >> 24) & 0xff);
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buf[4] = (unsigned char) (ft.dwLowDateTime & 0xff);
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buf[5] = (unsigned char) ((ft.dwLowDateTime >> 8) & 0xff);
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buf[6] = (unsigned char) ((ft.dwLowDateTime >> 16) & 0xff);
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buf[7] = (unsigned char) ((ft.dwLowDateTime >> 24) & 0xff);
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#else
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gettimeofday(&tv,NULL);
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buf[0] = (unsigned char) (tv.tv_sec & 0xff);
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buf[1] = (unsigned char) ((tv.tv_sec >> 8) & 0xff);
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buf[2] = (unsigned char) ((tv.tv_sec >> 16) & 0xff);
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buf[3] = (unsigned char) ((tv.tv_sec >> 24) & 0xff);
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buf[4] = (unsigned char) (tv.tv_usec & 0xff);
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buf[5] = (unsigned char) ((tv.tv_usec >> 8) & 0xff);
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buf[6] = (unsigned char) ((tv.tv_usec >> 16) & 0xff);
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buf[7] = (unsigned char) ((tv.tv_usec >> 24) & 0xff);
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#endif
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buf[8] = (unsigned char) (ctx->counter & 0xff);
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buf[9] = (unsigned char) ((ctx->counter >> 8) & 0xff);
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buf[10] = (unsigned char) ((ctx->counter >> 16) & 0xff);
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buf[11] = (unsigned char) ((ctx->counter >> 24) & 0xff);
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ctx->counter++;
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#ifndef GETPID_IS_MEANINGLESS
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pid=(unsigned long)getpid();
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buf[12] = (unsigned char) (pid & 0xff);
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buf[13] = (unsigned char) ((pid >> 8) & 0xff);
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buf[14] = (unsigned char) ((pid >> 16) & 0xff);
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buf[15] = (unsigned char) ((pid >> 24) & 0xff);
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#endif
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}
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static int fips_rand(FIPS_PRNG_CTX *ctx,
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unsigned char *out, FIPS_RAND_SIZE_T outlen)
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{
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unsigned char R[AES_BLOCK_LENGTH], I[AES_BLOCK_LENGTH];
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unsigned char tmp[AES_BLOCK_LENGTH];
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int i;
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if (ctx->error)
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{
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RANDerr(RAND_F_FIPS_RAND,RAND_R_PRNG_ERROR);
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return 0;
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}
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if (!ctx->keyed)
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{
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RANDerr(RAND_F_FIPS_RAND,RAND_R_NO_KEY_SET);
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return 0;
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}
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if (!ctx->seeded)
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{
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RANDerr(RAND_F_FIPS_RAND,RAND_R_PRNG_NOT_SEEDED);
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return 0;
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}
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for (;;)
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{
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if (!ctx->test_mode)
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fips_get_dt(ctx);
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AES_encrypt(ctx->DT, I, &ctx->ks);
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for (i = 0; i < AES_BLOCK_LENGTH; i++)
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tmp[i] = I[i] ^ ctx->V[i];
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AES_encrypt(tmp, R, &ctx->ks);
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for (i = 0; i < AES_BLOCK_LENGTH; i++)
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tmp[i] = R[i] ^ I[i];
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AES_encrypt(tmp, ctx->V, &ctx->ks);
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/* Continuous PRNG test */
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if (ctx->second)
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{
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if (fips_prng_fail)
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memcpy(ctx->last, R, AES_BLOCK_LENGTH);
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if (!memcmp(R, ctx->last, AES_BLOCK_LENGTH))
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{
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RANDerr(RAND_F_FIPS_RAND,RAND_R_PRNG_STUCK);
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ctx->error = 1;
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fips_set_selftest_fail();
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return 0;
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}
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}
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memcpy(ctx->last, R, AES_BLOCK_LENGTH);
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if (!ctx->second)
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{
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ctx->second = 1;
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if (!ctx->test_mode)
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continue;
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}
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if (outlen <= AES_BLOCK_LENGTH)
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{
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memcpy(out, R, outlen);
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break;
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}
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memcpy(out, R, AES_BLOCK_LENGTH);
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out += AES_BLOCK_LENGTH;
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outlen -= AES_BLOCK_LENGTH;
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}
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return 1;
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}
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int FIPS_rand_set_key(const unsigned char *key, FIPS_RAND_SIZE_T keylen)
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{
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int ret;
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CRYPTO_w_lock(CRYPTO_LOCK_RAND);
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ret = fips_set_prng_key(&sctx, key, keylen);
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CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
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return ret;
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}
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int FIPS_rand_seed(const void *seed, FIPS_RAND_SIZE_T seedlen)
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{
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int ret;
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CRYPTO_w_lock(CRYPTO_LOCK_RAND);
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ret = fips_set_prng_seed(&sctx, seed, seedlen);
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CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
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return ret;
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}
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int FIPS_rand_bytes(unsigned char *out, FIPS_RAND_SIZE_T count)
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{
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int ret;
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CRYPTO_w_lock(CRYPTO_LOCK_RAND);
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ret = fips_rand(&sctx, out, count);
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CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
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return ret;
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}
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int FIPS_rand_status(void)
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{
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int ret;
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CRYPTO_r_lock(CRYPTO_LOCK_RAND);
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ret = sctx.seeded;
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CRYPTO_r_unlock(CRYPTO_LOCK_RAND);
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return ret;
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}
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void FIPS_rand_reset(void)
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{
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CRYPTO_w_lock(CRYPTO_LOCK_RAND);
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fips_rand_prng_reset(&sctx);
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CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
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}
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static void fips_do_rand_seed(const void *seed, FIPS_RAND_SIZE_T seedlen)
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{
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FIPS_rand_seed(seed, seedlen);
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}
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static void fips_do_rand_add(const void *seed, FIPS_RAND_SIZE_T seedlen,
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double add_entropy)
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{
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FIPS_rand_seed(seed, seedlen);
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}
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static const RAND_METHOD rand_fips_meth=
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{
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fips_do_rand_seed,
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FIPS_rand_bytes,
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FIPS_rand_reset,
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fips_do_rand_add,
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FIPS_rand_bytes,
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FIPS_rand_status
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};
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const RAND_METHOD *FIPS_rand_method(void)
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{
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return &rand_fips_meth;
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}
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#endif
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