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Diffstat (limited to 'thirdparty/openssl/crypto/rand/rand_lib.c')
| -rw-r--r-- | thirdparty/openssl/crypto/rand/rand_lib.c | 300 |
1 files changed, 300 insertions, 0 deletions
diff --git a/thirdparty/openssl/crypto/rand/rand_lib.c b/thirdparty/openssl/crypto/rand/rand_lib.c new file mode 100644 index 0000000000..88a78d3506 --- /dev/null +++ b/thirdparty/openssl/crypto/rand/rand_lib.c @@ -0,0 +1,300 @@ +/* crypto/rand/rand_lib.c */ +/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) + * All rights reserved. + * + * This package is an SSL implementation written + * by Eric Young (eay@cryptsoft.com). + * The implementation was written so as to conform with Netscapes SSL. + * + * This library is free for commercial and non-commercial use as long as + * the following conditions are aheared to. The following conditions + * apply to all code found in this distribution, be it the RC4, RSA, + * lhash, DES, etc., code; not just the SSL code. The SSL documentation + * included with this distribution is covered by the same copyright terms + * except that the holder is Tim Hudson (tjh@cryptsoft.com). + * + * Copyright remains Eric Young's, and as such any Copyright notices in + * the code are not to be removed. + * If this package is used in a product, Eric Young should be given attribution + * as the author of the parts of the library used. + * This can be in the form of a textual message at program startup or + * in documentation (online or textual) provided with the package. + * + * 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 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 acknowledgement: + * "This product includes cryptographic software written by + * Eric Young (eay@cryptsoft.com)" + * The word 'cryptographic' can be left out if the rouines from the library + * being used are not cryptographic related :-). + * 4. If you include any Windows specific code (or a derivative thereof) from + * the apps directory (application code) you must include an acknowledgement: + * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" + * + * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND + * ANY EXPRESS 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 AUTHOR OR 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. + * + * The licence and distribution terms for any publically available version or + * derivative of this code cannot be changed. i.e. this code cannot simply be + * copied and put under another distribution licence + * [including the GNU Public Licence.] + */ + +#include <stdio.h> +#include <time.h> +#include "cryptlib.h" +#include <openssl/rand.h> + +#ifndef OPENSSL_NO_ENGINE +# include <openssl/engine.h> +#endif + +#ifdef OPENSSL_FIPS +# include <openssl/fips.h> +# include <openssl/fips_rand.h> +# include "rand_lcl.h" +#endif + +#ifndef OPENSSL_NO_ENGINE +/* non-NULL if default_RAND_meth is ENGINE-provided */ +static ENGINE *funct_ref = NULL; +#endif +static const RAND_METHOD *default_RAND_meth = NULL; + +int RAND_set_rand_method(const RAND_METHOD *meth) +{ +#ifndef OPENSSL_NO_ENGINE + if (funct_ref) { + ENGINE_finish(funct_ref); + funct_ref = NULL; + } +#endif + default_RAND_meth = meth; + return 1; +} + +const RAND_METHOD *RAND_get_rand_method(void) +{ + if (!default_RAND_meth) { +#ifndef OPENSSL_NO_ENGINE + ENGINE *e = ENGINE_get_default_RAND(); + if (e) { + default_RAND_meth = ENGINE_get_RAND(e); + if (!default_RAND_meth) { + ENGINE_finish(e); + e = NULL; + } + } + if (e) + funct_ref = e; + else +#endif + default_RAND_meth = RAND_SSLeay(); + } + return default_RAND_meth; +} + +#ifndef OPENSSL_NO_ENGINE +int RAND_set_rand_engine(ENGINE *engine) +{ + const RAND_METHOD *tmp_meth = NULL; + if (engine) { + if (!ENGINE_init(engine)) + return 0; + tmp_meth = ENGINE_get_RAND(engine); + if (!tmp_meth) { + ENGINE_finish(engine); + return 0; + } + } + /* This function releases any prior ENGINE so call it first */ + RAND_set_rand_method(tmp_meth); + funct_ref = engine; + return 1; +} +#endif + +void RAND_cleanup(void) +{ + const RAND_METHOD *meth = RAND_get_rand_method(); + if (meth && meth->cleanup) + meth->cleanup(); + RAND_set_rand_method(NULL); +} + +void RAND_seed(const void *buf, int num) +{ + const RAND_METHOD *meth = RAND_get_rand_method(); + if (meth && meth->seed) + meth->seed(buf, num); +} + +void RAND_add(const void *buf, int num, double entropy) +{ + const RAND_METHOD *meth = RAND_get_rand_method(); + if (meth && meth->add) + meth->add(buf, num, entropy); +} + +int RAND_bytes(unsigned char *buf, int num) +{ + const RAND_METHOD *meth = RAND_get_rand_method(); + if (meth && meth->bytes) + return meth->bytes(buf, num); + return (-1); +} + +int RAND_pseudo_bytes(unsigned char *buf, int num) +{ + const RAND_METHOD *meth = RAND_get_rand_method(); + if (meth && meth->pseudorand) + return meth->pseudorand(buf, num); + return (-1); +} + +int RAND_status(void) +{ + const RAND_METHOD *meth = RAND_get_rand_method(); + if (meth && meth->status) + return meth->status(); + return 0; +} + +#ifdef OPENSSL_FIPS + +/* + * FIPS DRBG initialisation code. This sets up the DRBG for use by the rest + * of OpenSSL. + */ + +/* + * Entropy gatherer: use standard OpenSSL PRNG to seed (this will gather + * entropy internally through RAND_poll(). + */ + +static size_t drbg_get_entropy(DRBG_CTX *ctx, unsigned char **pout, + int entropy, size_t min_len, size_t max_len) +{ + /* Round up request to multiple of block size */ + min_len = ((min_len + 19) / 20) * 20; + *pout = OPENSSL_malloc(min_len); + if (!*pout) + return 0; + if (ssleay_rand_bytes(*pout, min_len, 0, 0) <= 0) { + OPENSSL_free(*pout); + *pout = NULL; + return 0; + } + return min_len; +} + +static void drbg_free_entropy(DRBG_CTX *ctx, unsigned char *out, size_t olen) +{ + if (out) { + OPENSSL_cleanse(out, olen); + OPENSSL_free(out); + } +} + +/* + * Set "additional input" when generating random data. This uses the current + * PID, a time value and a counter. + */ + +static size_t drbg_get_adin(DRBG_CTX *ctx, unsigned char **pout) +{ + /* Use of static variables is OK as this happens under a lock */ + static unsigned char buf[16]; + static unsigned long counter; + FIPS_get_timevec(buf, &counter); + *pout = buf; + return sizeof(buf); +} + +/* + * RAND_add() and RAND_seed() pass through to OpenSSL PRNG so it is + * correctly seeded by RAND_poll(). + */ + +static int drbg_rand_add(DRBG_CTX *ctx, const void *in, int inlen, + double entropy) +{ + RAND_SSLeay()->add(in, inlen, entropy); + return 1; +} + +static int drbg_rand_seed(DRBG_CTX *ctx, const void *in, int inlen) +{ + RAND_SSLeay()->seed(in, inlen); + return 1; +} + +# ifndef OPENSSL_DRBG_DEFAULT_TYPE +# define OPENSSL_DRBG_DEFAULT_TYPE NID_aes_256_ctr +# endif +# ifndef OPENSSL_DRBG_DEFAULT_FLAGS +# define OPENSSL_DRBG_DEFAULT_FLAGS DRBG_FLAG_CTR_USE_DF +# endif + +static int fips_drbg_type = OPENSSL_DRBG_DEFAULT_TYPE; +static int fips_drbg_flags = OPENSSL_DRBG_DEFAULT_FLAGS; + +void RAND_set_fips_drbg_type(int type, int flags) +{ + fips_drbg_type = type; + fips_drbg_flags = flags; +} + +int RAND_init_fips(void) +{ + DRBG_CTX *dctx; + size_t plen; + unsigned char pers[32], *p; +# ifndef OPENSSL_ALLOW_DUAL_EC_DRBG + if (fips_drbg_type >> 16) { + RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_DUAL_EC_DRBG_DISABLED); + return 0; + } +# endif + + dctx = FIPS_get_default_drbg(); + if (FIPS_drbg_init(dctx, fips_drbg_type, fips_drbg_flags) <= 0) { + RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_ERROR_INITIALISING_DRBG); + return 0; + } + + FIPS_drbg_set_callbacks(dctx, + drbg_get_entropy, drbg_free_entropy, 20, + drbg_get_entropy, drbg_free_entropy); + FIPS_drbg_set_rand_callbacks(dctx, drbg_get_adin, 0, + drbg_rand_seed, drbg_rand_add); + /* Personalisation string: a string followed by date time vector */ + strcpy((char *)pers, "OpenSSL DRBG2.0"); + plen = drbg_get_adin(dctx, &p); + memcpy(pers + 16, p, plen); + + if (FIPS_drbg_instantiate(dctx, pers, sizeof(pers)) <= 0) { + RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_ERROR_INSTANTIATING_DRBG); + return 0; + } + FIPS_rand_set_method(FIPS_drbg_method()); + return 1; +} + +#endif |