diff options
Diffstat (limited to 'openssl/fips/rand/fips_rand.c')
| -rw-r--r-- | openssl/fips/rand/fips_rand.c | 410 |
1 files changed, 410 insertions, 0 deletions
diff --git a/openssl/fips/rand/fips_rand.c b/openssl/fips/rand/fips_rand.c new file mode 100644 index 000000000..58453e996 --- /dev/null +++ b/openssl/fips/rand/fips_rand.c @@ -0,0 +1,410 @@ +/* ==================================================================== + * Copyright (c) 2007 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. + * + */ + +/* + * This is a FIPS approved AES PRNG based on ANSI X9.31 A.2.4. + */ + +#include "e_os.h" + +/* If we don't define _XOPEN_SOURCE_EXTENDED, struct timeval won't + be defined and gettimeofday() won't be declared with strict compilers + like DEC C in ANSI C mode. */ +#ifndef _XOPEN_SOURCE_EXTENDED +#define _XOPEN_SOURCE_EXTENDED 1 +#endif + +#include <openssl/rand.h> +#include <openssl/aes.h> +#include <openssl/err.h> +#include <openssl/fips_rand.h> +#ifndef OPENSSL_SYS_WIN32 +#include <sys/time.h> +#endif +#include <assert.h> +#ifndef OPENSSL_SYS_WIN32 +# ifdef OPENSSL_UNISTD +# include OPENSSL_UNISTD +# else +# include <unistd.h> +# endif +#endif +#include <string.h> +#include <openssl/fips.h> +#include "fips_locl.h" + +#ifdef OPENSSL_FIPS + +void *OPENSSL_stderr(void); + +#define AES_BLOCK_LENGTH 16 + + +/* AES FIPS PRNG implementation */ + +typedef struct + { + int seeded; + int keyed; + int test_mode; + int second; + int error; + unsigned long counter; + AES_KEY ks; + int vpos; + /* Temporary storage for key if it equals seed length */ + unsigned char tmp_key[AES_BLOCK_LENGTH]; + unsigned char V[AES_BLOCK_LENGTH]; + unsigned char DT[AES_BLOCK_LENGTH]; + unsigned char last[AES_BLOCK_LENGTH]; + } FIPS_PRNG_CTX; + +static FIPS_PRNG_CTX sctx; + +static int fips_prng_fail = 0; + +void FIPS_rng_stick(void) + { + fips_prng_fail = 1; + } + +void fips_rand_prng_reset(FIPS_PRNG_CTX *ctx) + { + ctx->seeded = 0; + ctx->keyed = 0; + ctx->test_mode = 0; + ctx->counter = 0; + ctx->second = 0; + ctx->error = 0; + ctx->vpos = 0; + OPENSSL_cleanse(ctx->V, AES_BLOCK_LENGTH); + OPENSSL_cleanse(&ctx->ks, sizeof(AES_KEY)); + } + + +static int fips_set_prng_key(FIPS_PRNG_CTX *ctx, + const unsigned char *key, FIPS_RAND_SIZE_T keylen) + { + FIPS_selftest_check(); + if (keylen != 16 && keylen != 24 && keylen != 32) + { + /* error: invalid key size */ + return 0; + } + AES_set_encrypt_key(key, keylen << 3, &ctx->ks); + if (keylen == 16) + { + memcpy(ctx->tmp_key, key, 16); + ctx->keyed = 2; + } + else + ctx->keyed = 1; + ctx->seeded = 0; + ctx->second = 0; + return 1; + } + +static int fips_set_prng_seed(FIPS_PRNG_CTX *ctx, + const unsigned char *seed, FIPS_RAND_SIZE_T seedlen) + { + int i; + if (!ctx->keyed) + return 0; + /* In test mode seed is just supplied data */ + if (ctx->test_mode) + { + if (seedlen != AES_BLOCK_LENGTH) + return 0; + memcpy(ctx->V, seed, AES_BLOCK_LENGTH); + ctx->seeded = 1; + return 1; + } + /* Outside test mode XOR supplied data with existing seed */ + for (i = 0; i < seedlen; i++) + { + ctx->V[ctx->vpos++] ^= seed[i]; + if (ctx->vpos == AES_BLOCK_LENGTH) + { + ctx->vpos = 0; + /* Special case if first seed and key length equals + * block size check key and seed do not match. + */ + if (ctx->keyed == 2) + { + if (!memcmp(ctx->tmp_key, ctx->V, 16)) + { + RANDerr(RAND_F_FIPS_SET_PRNG_SEED, + RAND_R_PRNG_SEED_MUST_NOT_MATCH_KEY); + return 0; + } + OPENSSL_cleanse(ctx->tmp_key, 16); + ctx->keyed = 1; + } + ctx->seeded = 1; + } + } + return 1; + } + +int fips_set_test_mode(FIPS_PRNG_CTX *ctx) + { + if (ctx->keyed) + { + RANDerr(RAND_F_FIPS_SET_TEST_MODE,RAND_R_PRNG_KEYED); + return 0; + } + ctx->test_mode = 1; + return 1; + } + +int FIPS_rand_test_mode(void) + { + return fips_set_test_mode(&sctx); + } + +int FIPS_rand_set_dt(unsigned char *dt) + { + if (!sctx.test_mode) + { + RANDerr(RAND_F_FIPS_RAND_SET_DT,RAND_R_NOT_IN_TEST_MODE); + return 0; + } + memcpy(sctx.DT, dt, AES_BLOCK_LENGTH); + return 1; + } + +static void fips_get_dt(FIPS_PRNG_CTX *ctx) + { +#ifdef OPENSSL_SYS_WIN32 + FILETIME ft; +#else + struct timeval tv; +#endif + unsigned char *buf = ctx->DT; + +#ifndef GETPID_IS_MEANINGLESS + unsigned long pid; +#endif + +#ifdef OPENSSL_SYS_WIN32 + GetSystemTimeAsFileTime(&ft); + buf[0] = (unsigned char) (ft.dwHighDateTime & 0xff); + buf[1] = (unsigned char) ((ft.dwHighDateTime >> 8) & 0xff); + buf[2] = (unsigned char) ((ft.dwHighDateTime >> 16) & 0xff); + buf[3] = (unsigned char) ((ft.dwHighDateTime >> 24) & 0xff); + buf[4] = (unsigned char) (ft.dwLowDateTime & 0xff); + buf[5] = (unsigned char) ((ft.dwLowDateTime >> 8) & 0xff); + buf[6] = (unsigned char) ((ft.dwLowDateTime >> 16) & 0xff); + buf[7] = (unsigned char) ((ft.dwLowDateTime >> 24) & 0xff); +#else + gettimeofday(&tv,NULL); + buf[0] = (unsigned char) (tv.tv_sec & 0xff); + buf[1] = (unsigned char) ((tv.tv_sec >> 8) & 0xff); + buf[2] = (unsigned char) ((tv.tv_sec >> 16) & 0xff); + buf[3] = (unsigned char) ((tv.tv_sec >> 24) & 0xff); + buf[4] = (unsigned char) (tv.tv_usec & 0xff); + buf[5] = (unsigned char) ((tv.tv_usec >> 8) & 0xff); + buf[6] = (unsigned char) ((tv.tv_usec >> 16) & 0xff); + buf[7] = (unsigned char) ((tv.tv_usec >> 24) & 0xff); +#endif + buf[8] = (unsigned char) (ctx->counter & 0xff); + buf[9] = (unsigned char) ((ctx->counter >> 8) & 0xff); + buf[10] = (unsigned char) ((ctx->counter >> 16) & 0xff); + buf[11] = (unsigned char) ((ctx->counter >> 24) & 0xff); + + ctx->counter++; + + +#ifndef GETPID_IS_MEANINGLESS + pid=(unsigned long)getpid(); + buf[12] = (unsigned char) (pid & 0xff); + buf[13] = (unsigned char) ((pid >> 8) & 0xff); + buf[14] = (unsigned char) ((pid >> 16) & 0xff); + buf[15] = (unsigned char) ((pid >> 24) & 0xff); +#endif + } + +static int fips_rand(FIPS_PRNG_CTX *ctx, + unsigned char *out, FIPS_RAND_SIZE_T outlen) + { + unsigned char R[AES_BLOCK_LENGTH], I[AES_BLOCK_LENGTH]; + unsigned char tmp[AES_BLOCK_LENGTH]; + int i; + if (ctx->error) + { + RANDerr(RAND_F_FIPS_RAND,RAND_R_PRNG_ERROR); + return 0; + } + if (!ctx->keyed) + { + RANDerr(RAND_F_FIPS_RAND,RAND_R_NO_KEY_SET); + return 0; + } + if (!ctx->seeded) + { + RANDerr(RAND_F_FIPS_RAND,RAND_R_PRNG_NOT_SEEDED); + return 0; + } + for (;;) + { + if (!ctx->test_mode) + fips_get_dt(ctx); + AES_encrypt(ctx->DT, I, &ctx->ks); + for (i = 0; i < AES_BLOCK_LENGTH; i++) + tmp[i] = I[i] ^ ctx->V[i]; + AES_encrypt(tmp, R, &ctx->ks); + for (i = 0; i < AES_BLOCK_LENGTH; i++) + tmp[i] = R[i] ^ I[i]; + AES_encrypt(tmp, ctx->V, &ctx->ks); + /* Continuous PRNG test */ + if (ctx->second) + { + if (fips_prng_fail) + memcpy(ctx->last, R, AES_BLOCK_LENGTH); + if (!memcmp(R, ctx->last, AES_BLOCK_LENGTH)) + { + RANDerr(RAND_F_FIPS_RAND,RAND_R_PRNG_STUCK); + ctx->error = 1; + fips_set_selftest_fail(); + return 0; + } + } + memcpy(ctx->last, R, AES_BLOCK_LENGTH); + if (!ctx->second) + { + ctx->second = 1; + if (!ctx->test_mode) + continue; + } + + if (outlen <= AES_BLOCK_LENGTH) + { + memcpy(out, R, outlen); + break; + } + + memcpy(out, R, AES_BLOCK_LENGTH); + out += AES_BLOCK_LENGTH; + outlen -= AES_BLOCK_LENGTH; + } + return 1; + } + + +int FIPS_rand_set_key(const unsigned char *key, FIPS_RAND_SIZE_T keylen) + { + int ret; + CRYPTO_w_lock(CRYPTO_LOCK_RAND); + ret = fips_set_prng_key(&sctx, key, keylen); + CRYPTO_w_unlock(CRYPTO_LOCK_RAND); + return ret; + } + +int FIPS_rand_seed(const void *seed, FIPS_RAND_SIZE_T seedlen) + { + int ret; + CRYPTO_w_lock(CRYPTO_LOCK_RAND); + ret = fips_set_prng_seed(&sctx, seed, seedlen); + CRYPTO_w_unlock(CRYPTO_LOCK_RAND); + return ret; + } + + +int FIPS_rand_bytes(unsigned char *out, FIPS_RAND_SIZE_T count) + { + int ret; + CRYPTO_w_lock(CRYPTO_LOCK_RAND); + ret = fips_rand(&sctx, out, count); + CRYPTO_w_unlock(CRYPTO_LOCK_RAND); + return ret; + } + +int FIPS_rand_status(void) + { + int ret; + CRYPTO_r_lock(CRYPTO_LOCK_RAND); + ret = sctx.seeded; + CRYPTO_r_unlock(CRYPTO_LOCK_RAND); + return ret; + } + +void FIPS_rand_reset(void) + { + CRYPTO_w_lock(CRYPTO_LOCK_RAND); + fips_rand_prng_reset(&sctx); + CRYPTO_w_unlock(CRYPTO_LOCK_RAND); + } + +static void fips_do_rand_seed(const void *seed, FIPS_RAND_SIZE_T seedlen) + { + FIPS_rand_seed(seed, seedlen); + } + +static void fips_do_rand_add(const void *seed, FIPS_RAND_SIZE_T seedlen, + double add_entropy) + { + FIPS_rand_seed(seed, seedlen); + } + +static const RAND_METHOD rand_fips_meth= + { + fips_do_rand_seed, + FIPS_rand_bytes, + FIPS_rand_reset, + fips_do_rand_add, + FIPS_rand_bytes, + FIPS_rand_status + }; + +const RAND_METHOD *FIPS_rand_method(void) +{ + return &rand_fips_meth; +} + +#endif |