| /* |
| * Copyright 2011-2017 The OpenSSL Project Authors. All Rights Reserved. |
| * |
| * Licensed under the OpenSSL license (the "License"). You may not use |
| * this file except in compliance with the License. You can obtain a copy |
| * in the file LICENSE in the source distribution or at |
| * https://www.openssl.org/source/license.html |
| */ |
| |
| #include <string.h> |
| #include <openssl/crypto.h> |
| #include <openssl/err.h> |
| #include <openssl/rand.h> |
| #include "rand_lcl.h" |
| #include "internal/thread_once.h" |
| #include "internal/rand_int.h" |
| |
| static RAND_DRBG rand_drbg; /* The default global DRBG. */ |
| static RAND_DRBG priv_drbg; /* The global private-key DRBG. */ |
| |
| /* NIST SP 800-90A DRBG recommends the use of a personalization string. */ |
| static const char ossl_pers_string[] = "OpenSSL NIST SP 800-90A DRBG"; |
| |
| /* |
| * Support framework for NIST SP 800-90A DRBG, AES-CTR mode. |
| * The RAND_DRBG is OpenSSL's pointer to an instance of the DRBG. |
| * |
| * The OpenSSL model is to have new and free functions, and that new |
| * does all initialization. That is not the NIST model, which has |
| * instantiation and un-instantiate, and re-use within a new/free |
| * lifecycle. (No doubt this comes from the desire to support hardware |
| * DRBG, where allocation of resources on something like an HSM is |
| * a much bigger deal than just re-setting an allocated resource.) |
| */ |
| |
| static CRYPTO_ONCE rand_drbg_init = CRYPTO_ONCE_STATIC_INIT; |
| |
| static int drbg_setup(RAND_DRBG *drbg, const char *name); |
| |
| /* |
| * Set/initialize |drbg| to be of type |nid|, with optional |flags|. |
| * Return -2 if the type is not supported, 1 on success and -1 on |
| * failure. |
| */ |
| int RAND_DRBG_set(RAND_DRBG *drbg, int nid, unsigned int flags) |
| { |
| int ret = 1; |
| |
| drbg->state = DRBG_UNINITIALISED; |
| drbg->flags = flags; |
| drbg->nid = nid; |
| |
| switch (nid) { |
| default: |
| RANDerr(RAND_F_RAND_DRBG_SET, RAND_R_UNSUPPORTED_DRBG_TYPE); |
| return -2; |
| case 0: |
| /* Uninitialized; that's okay. */ |
| return 1; |
| case NID_aes_128_ctr: |
| case NID_aes_192_ctr: |
| case NID_aes_256_ctr: |
| ret = ctr_init(drbg); |
| break; |
| } |
| |
| if (ret < 0) |
| RANDerr(RAND_F_RAND_DRBG_SET, RAND_R_ERROR_INITIALISING_DRBG); |
| return ret; |
| } |
| |
| /* |
| * Allocate memory and initialize a new DRBG. The |parent|, if not |
| * NULL, will be used to auto-seed this RAND_DRBG as needed. |
| */ |
| RAND_DRBG *RAND_DRBG_new(int type, unsigned int flags, RAND_DRBG *parent) |
| { |
| RAND_DRBG *drbg = OPENSSL_zalloc(sizeof(*drbg)); |
| |
| if (drbg == NULL) { |
| RANDerr(RAND_F_RAND_DRBG_NEW, ERR_R_MALLOC_FAILURE); |
| goto err; |
| } |
| drbg->fork_count = rand_fork_count; |
| drbg->parent = parent; |
| if (RAND_DRBG_set(drbg, type, flags) < 0) |
| goto err; |
| |
| if (parent != NULL) { |
| if (!RAND_DRBG_set_callbacks(drbg, rand_drbg_get_entropy, |
| rand_drbg_cleanup_entropy, |
| NULL, NULL)) |
| goto err; |
| } |
| |
| return drbg; |
| |
| err: |
| OPENSSL_free(drbg); |
| return NULL; |
| } |
| |
| /* |
| * Uninstantiate |drbg| and free all memory. |
| */ |
| void RAND_DRBG_free(RAND_DRBG *drbg) |
| { |
| if (drbg == NULL) |
| return; |
| |
| ctr_uninstantiate(drbg); |
| CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DRBG, drbg, &drbg->ex_data); |
| OPENSSL_clear_free(drbg, sizeof(*drbg)); |
| } |
| |
| /* |
| * Instantiate |drbg|, after it has been initialized. Use |pers| and |
| * |perslen| as prediction-resistance input. |
| * |
| * Requires that drbg->lock is already locked for write, if non-null. |
| */ |
| int RAND_DRBG_instantiate(RAND_DRBG *drbg, |
| const unsigned char *pers, size_t perslen) |
| { |
| unsigned char *nonce = NULL, *entropy = NULL; |
| size_t noncelen = 0, entropylen = 0; |
| |
| if (perslen > drbg->max_perslen) { |
| RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, |
| RAND_R_PERSONALISATION_STRING_TOO_LONG); |
| goto end; |
| } |
| if (drbg->state != DRBG_UNINITIALISED) { |
| RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, |
| drbg->state == DRBG_ERROR ? RAND_R_IN_ERROR_STATE |
| : RAND_R_ALREADY_INSTANTIATED); |
| goto end; |
| } |
| |
| drbg->state = DRBG_ERROR; |
| if (drbg->get_entropy != NULL) |
| entropylen = drbg->get_entropy(drbg, &entropy, drbg->strength, |
| drbg->min_entropylen, drbg->max_entropylen); |
| if (entropylen < drbg->min_entropylen |
| || entropylen > drbg->max_entropylen) { |
| RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, RAND_R_ERROR_RETRIEVING_ENTROPY); |
| goto end; |
| } |
| |
| if (drbg->max_noncelen > 0 && drbg->get_nonce != NULL) { |
| noncelen = drbg->get_nonce(drbg, &nonce, drbg->strength / 2, |
| drbg->min_noncelen, drbg->max_noncelen); |
| if (noncelen < drbg->min_noncelen || noncelen > drbg->max_noncelen) { |
| RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, |
| RAND_R_ERROR_RETRIEVING_NONCE); |
| goto end; |
| } |
| } |
| |
| if (!ctr_instantiate(drbg, entropy, entropylen, |
| nonce, noncelen, pers, perslen)) { |
| RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, RAND_R_ERROR_INSTANTIATING_DRBG); |
| goto end; |
| } |
| |
| drbg->state = DRBG_READY; |
| drbg->reseed_counter = 1; |
| |
| end: |
| if (entropy != NULL && drbg->cleanup_entropy != NULL) |
| drbg->cleanup_entropy(drbg, entropy, entropylen); |
| if (nonce != NULL && drbg->cleanup_nonce!= NULL ) |
| drbg->cleanup_nonce(drbg, nonce, noncelen); |
| if (drbg->pool != NULL) { |
| if (drbg->state == DRBG_READY) { |
| RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, |
| RAND_R_ERROR_ENTROPY_POOL_WAS_IGNORED); |
| drbg->state = DRBG_ERROR; |
| } |
| RAND_POOL_free(drbg->pool); |
| drbg->pool = NULL; |
| } |
| if (drbg->state == DRBG_READY) |
| return 1; |
| return 0; |
| } |
| |
| /* |
| * Uninstantiate |drbg|. Must be instantiated before it can be used. |
| * |
| * Requires that drbg->lock is already locked for write, if non-null. |
| */ |
| int RAND_DRBG_uninstantiate(RAND_DRBG *drbg) |
| { |
| int ret = ctr_uninstantiate(drbg); |
| |
| OPENSSL_cleanse(&drbg->ctr, sizeof(drbg->ctr)); |
| drbg->state = DRBG_UNINITIALISED; |
| return ret; |
| } |
| |
| /* |
| * Reseed |drbg|, mixing in the specified data |
| * |
| * Requires that drbg->lock is already locked for write, if non-null. |
| */ |
| int RAND_DRBG_reseed(RAND_DRBG *drbg, |
| const unsigned char *adin, size_t adinlen) |
| { |
| unsigned char *entropy = NULL; |
| size_t entropylen = 0; |
| |
| if (drbg->state == DRBG_ERROR) { |
| RANDerr(RAND_F_RAND_DRBG_RESEED, RAND_R_IN_ERROR_STATE); |
| return 0; |
| } |
| if (drbg->state == DRBG_UNINITIALISED) { |
| RANDerr(RAND_F_RAND_DRBG_RESEED, RAND_R_NOT_INSTANTIATED); |
| return 0; |
| } |
| |
| if (adin == NULL) |
| adinlen = 0; |
| else if (adinlen > drbg->max_adinlen) { |
| RANDerr(RAND_F_RAND_DRBG_RESEED, RAND_R_ADDITIONAL_INPUT_TOO_LONG); |
| return 0; |
| } |
| |
| drbg->state = DRBG_ERROR; |
| if (drbg->get_entropy != NULL) |
| entropylen = drbg->get_entropy(drbg, &entropy, drbg->strength, |
| drbg->min_entropylen, drbg->max_entropylen); |
| if (entropylen < drbg->min_entropylen |
| || entropylen > drbg->max_entropylen) { |
| RANDerr(RAND_F_RAND_DRBG_RESEED, RAND_R_ERROR_RETRIEVING_ENTROPY); |
| goto end; |
| } |
| |
| if (!ctr_reseed(drbg, entropy, entropylen, adin, adinlen)) |
| goto end; |
| drbg->state = DRBG_READY; |
| drbg->reseed_counter = 1; |
| |
| end: |
| if (entropy != NULL && drbg->cleanup_entropy != NULL) |
| drbg->cleanup_entropy(drbg, entropy, entropylen); |
| if (drbg->state == DRBG_READY) |
| return 1; |
| return 0; |
| } |
| |
| /* |
| * Restart |drbg|, using the specified entropy or additional input |
| * |
| * Tries its best to get the drbg instantiated by all means, |
| * regardless of its current state. |
| * |
| * Optionally, a |buffer| of |len| random bytes can be passed, |
| * which is assumed to contain at least |entropy| bits of entropy. |
| * |
| * If |entropy| > 0, the buffer content is used as entropy input. |
| * |
| * If |entropy| == 0, the buffer content is used as additional input |
| * |
| * Returns 1 on success, 0 on failure. |
| * |
| * This function is used internally only. |
| */ |
| int rand_drbg_restart(RAND_DRBG *drbg, |
| const unsigned char *buffer, size_t len, size_t entropy) |
| { |
| int reseeded = 0; |
| const unsigned char *adin = NULL; |
| size_t adinlen = 0; |
| |
| if (drbg->pool != NULL) { |
| RANDerr(RAND_F_RAND_DRBG_RESTART, ERR_R_INTERNAL_ERROR); |
| RAND_POOL_free(drbg->pool); |
| drbg->pool = NULL; |
| } |
| |
| if (buffer != NULL) { |
| if (entropy > 0) { |
| if (drbg->max_entropylen < len) { |
| RANDerr(RAND_F_RAND_DRBG_RESTART, |
| RAND_R_ENTROPY_INPUT_TOO_LONG); |
| return 0; |
| } |
| |
| if (entropy > 8 * len) { |
| RANDerr(RAND_F_RAND_DRBG_RESTART, RAND_R_ENTROPY_OUT_OF_RANGE); |
| return 0; |
| } |
| |
| /* will be picked up by the rand_drbg_get_entropy() callback */ |
| drbg->pool = RAND_POOL_new(entropy, len, len); |
| if (drbg->pool == NULL) |
| return 0; |
| |
| RAND_POOL_add(drbg->pool, buffer, len, entropy); |
| } else { |
| if (drbg->max_adinlen < len) { |
| RANDerr(RAND_F_RAND_DRBG_RESTART, |
| RAND_R_ADDITIONAL_INPUT_TOO_LONG); |
| return 0; |
| } |
| adin = buffer; |
| adinlen = len; |
| } |
| } |
| |
| /* repair error state */ |
| if (drbg->state == DRBG_ERROR) |
| RAND_DRBG_uninstantiate(drbg); |
| |
| /* repair uninitialized state */ |
| if (drbg->state == DRBG_UNINITIALISED) { |
| drbg_setup(drbg, NULL); |
| /* already reseeded. prevent second reseeding below */ |
| reseeded = (drbg->state == DRBG_READY); |
| } |
| |
| /* refresh current state if entropy or additional input has been provided */ |
| if (drbg->state == DRBG_READY) { |
| if (adin != NULL) { |
| /* |
| * mix in additional input without reseeding |
| * |
| * Similar to RAND_DRBG_reseed(), but the provided additional |
| * data |adin| is mixed into the current state without pulling |
| * entropy from the trusted entropy source using get_entropy(). |
| * This is not a reseeding in the strict sense of NIST SP 800-90A. |
| */ |
| ctr_reseed(drbg, adin, adinlen, NULL, 0); |
| } else if (reseeded == 0) { |
| /* do a full reseeding if it has not been done yet above */ |
| RAND_DRBG_reseed(drbg, NULL, 0); |
| } |
| } |
| |
| /* check whether a given entropy pool was cleared properly during reseed */ |
| if (drbg->pool != NULL) { |
| drbg->state = DRBG_ERROR; |
| RANDerr(RAND_F_RAND_DRBG_RESTART, ERR_R_INTERNAL_ERROR); |
| RAND_POOL_free(drbg->pool); |
| drbg->pool = NULL; |
| return 0; |
| } |
| |
| return drbg->state == DRBG_READY; |
| } |
| |
| /* |
| * Generate |outlen| bytes into the buffer at |out|. Reseed if we need |
| * to or if |prediction_resistance| is set. Additional input can be |
| * sent in |adin| and |adinlen|. |
| * |
| * Requires that drbg->lock is already locked for write, if non-null. |
| * |
| * Returns 1 on success, 0 on failure. |
| * |
| */ |
| int RAND_DRBG_generate(RAND_DRBG *drbg, unsigned char *out, size_t outlen, |
| int prediction_resistance, |
| const unsigned char *adin, size_t adinlen) |
| { |
| int reseed_required = 0; |
| |
| if (drbg->state != DRBG_READY) { |
| /* try to recover from previous errors */ |
| rand_drbg_restart(drbg, NULL, 0, 0); |
| |
| if (drbg->state == DRBG_ERROR) { |
| RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_IN_ERROR_STATE); |
| return 0; |
| } |
| if (drbg->state == DRBG_UNINITIALISED) { |
| RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_NOT_INSTANTIATED); |
| return 0; |
| } |
| } |
| |
| if (outlen > drbg->max_request) { |
| RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_REQUEST_TOO_LARGE_FOR_DRBG); |
| return 0; |
| } |
| if (adinlen > drbg->max_adinlen) { |
| RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_ADDITIONAL_INPUT_TOO_LONG); |
| return 0; |
| } |
| |
| if (drbg->fork_count != rand_fork_count) { |
| drbg->fork_count = rand_fork_count; |
| reseed_required = 1; |
| } |
| |
| if (drbg->reseed_counter >= drbg->reseed_interval) |
| reseed_required = 1; |
| |
| if (reseed_required || prediction_resistance) { |
| if (!RAND_DRBG_reseed(drbg, adin, adinlen)) { |
| RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_RESEED_ERROR); |
| return 0; |
| } |
| adin = NULL; |
| adinlen = 0; |
| } |
| |
| if (!ctr_generate(drbg, out, outlen, adin, adinlen)) { |
| drbg->state = DRBG_ERROR; |
| RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_GENERATE_ERROR); |
| return 0; |
| } |
| |
| drbg->reseed_counter++; |
| |
| return 1; |
| } |
| |
| /* |
| * Set the RAND_DRBG callbacks for obtaining entropy and nonce. |
| * |
| * In the following, the signature and the semantics of the |
| * get_entropy() and cleanup_entropy() callbacks are explained. |
| * |
| * GET_ENTROPY |
| * |
| * size_t get_entropy(RAND_DRBG *ctx, |
| * unsigned char **pout, |
| * int entropy, |
| * size_t min_len, size_t max_len); |
| * |
| * This is a request to allocate and fill a buffer of size |
| * |min_len| <= size <= |max_len| (in bytes) which contains |
| * at least |entropy| bits of randomness. The buffer's address is |
| * to be returned in |*pout| and the number of collected |
| * randomness bytes (which may be less than the allocated size |
| * of the buffer) as return value. |
| * |
| * If the callback fails to acquire at least |entropy| bits of |
| * randomness, it shall return a buffer length of 0. |
| * |
| * CLEANUP_ENTROPY |
| * |
| * void cleanup_entropy(RAND_DRBG *ctx, |
| * unsigned char *out, size_t outlen); |
| * |
| * A request to clear and free the buffer allocated by get_entropy(). |
| * The values |out| and |outlen| are expected to be the random buffer's |
| * address and length, as returned by the get_entropy() callback. |
| * |
| * GET_NONCE, CLEANUP_NONCE |
| * |
| * Signature and semantics of the get_nonce() and cleanup_nonce() |
| * callbacks are analogous to get_entropy() and cleanup_entropy(). |
| * Currently, the nonce is used only for the known answer tests. |
| */ |
| int RAND_DRBG_set_callbacks(RAND_DRBG *drbg, |
| RAND_DRBG_get_entropy_fn get_entropy, |
| RAND_DRBG_cleanup_entropy_fn cleanup_entropy, |
| RAND_DRBG_get_nonce_fn get_nonce, |
| RAND_DRBG_cleanup_nonce_fn cleanup_nonce) |
| { |
| if (drbg->state != DRBG_UNINITIALISED) |
| return 0; |
| drbg->get_entropy = get_entropy; |
| drbg->cleanup_entropy = cleanup_entropy; |
| drbg->get_nonce = get_nonce; |
| drbg->cleanup_nonce = cleanup_nonce; |
| return 1; |
| } |
| |
| /* |
| * Set the reseed interval. |
| */ |
| int RAND_DRBG_set_reseed_interval(RAND_DRBG *drbg, int interval) |
| { |
| if (interval < 0 || interval > MAX_RESEED) |
| return 0; |
| drbg->reseed_interval = interval; |
| return 1; |
| } |
| |
| /* |
| * Get and set the EXDATA |
| */ |
| int RAND_DRBG_set_ex_data(RAND_DRBG *drbg, int idx, void *arg) |
| { |
| return CRYPTO_set_ex_data(&drbg->ex_data, idx, arg); |
| } |
| |
| void *RAND_DRBG_get_ex_data(const RAND_DRBG *drbg, int idx) |
| { |
| return CRYPTO_get_ex_data(&drbg->ex_data, idx); |
| } |
| |
| |
| /* |
| * The following functions provide a RAND_METHOD that works on the |
| * global DRBG. They lock. |
| */ |
| |
| /* |
| * Initializes the DRBG with default settings. |
| * For global DRBGs a global lock is created with the given name |
| * Returns 1 on success, 0 on failure |
| */ |
| static int drbg_setup(RAND_DRBG *drbg, const char *name) |
| { |
| int ret = 1; |
| |
| if (name != NULL) { |
| if (drbg->lock != NULL) { |
| RANDerr(RAND_F_DRBG_SETUP, ERR_R_INTERNAL_ERROR); |
| return 0; |
| } |
| |
| drbg->lock = CRYPTO_THREAD_glock_new(name); |
| if (drbg->lock == NULL) { |
| RANDerr(RAND_F_DRBG_SETUP, RAND_R_FAILED_TO_CREATE_LOCK); |
| return 0; |
| } |
| } |
| |
| ret &= RAND_DRBG_set(drbg, |
| RAND_DRBG_NID, RAND_DRBG_FLAG_CTR_USE_DF) == 1; |
| ret &= RAND_DRBG_set_callbacks(drbg, rand_drbg_get_entropy, |
| rand_drbg_cleanup_entropy, NULL, NULL) == 1; |
| /* |
| * Ignore instantiation error so support just-in-time instantiation. |
| * |
| * The state of the drbg will be checked in RAND_DRBG_generate() and |
| * an automatic recovery is attempted. |
| */ |
| RAND_DRBG_instantiate(drbg, |
| (const unsigned char *) ossl_pers_string, |
| sizeof(ossl_pers_string) - 1); |
| return ret; |
| } |
| |
| /* |
| * Initialize the global DRBGs on first use. |
| * Returns 1 on success, 0 on failure. |
| */ |
| DEFINE_RUN_ONCE_STATIC(do_rand_drbg_init) |
| { |
| int ret = 1; |
| |
| ret &= drbg_setup(&rand_drbg, "rand_drbg"); |
| ret &= drbg_setup(&priv_drbg, "priv_drbg"); |
| |
| return ret; |
| } |
| |
| /* Cleans up the given global DRBG */ |
| static void drbg_cleanup(RAND_DRBG *drbg) |
| { |
| CRYPTO_THREAD_lock_free(drbg->lock); |
| RAND_DRBG_uninstantiate(drbg); |
| } |
| |
| /* Clean up the global DRBGs before exit */ |
| void rand_drbg_cleanup_int(void) |
| { |
| drbg_cleanup(&rand_drbg); |
| drbg_cleanup(&priv_drbg); |
| } |
| |
| /* Implements the default OpenSSL RAND_bytes() method */ |
| static int drbg_bytes(unsigned char *out, int count) |
| { |
| int ret = 0; |
| size_t chunk; |
| RAND_DRBG *drbg = RAND_DRBG_get0_global(); |
| |
| if (drbg == NULL) |
| return 0; |
| |
| CRYPTO_THREAD_write_lock(drbg->lock); |
| if (drbg->state == DRBG_UNINITIALISED) |
| goto err; |
| |
| for ( ; count > 0; count -= chunk, out += chunk) { |
| chunk = count; |
| if (chunk > drbg->max_request) |
| chunk = drbg->max_request; |
| ret = RAND_DRBG_generate(drbg, out, chunk, 0, NULL, 0); |
| if (!ret) |
| goto err; |
| } |
| ret = 1; |
| |
| err: |
| CRYPTO_THREAD_unlock(drbg->lock); |
| return ret; |
| } |
| |
| /* Implements the default OpenSSL RAND_add() method */ |
| static int drbg_add(const void *buf, int num, double randomness) |
| { |
| int ret = 0; |
| RAND_DRBG *drbg = RAND_DRBG_get0_global(); |
| |
| if (drbg == NULL) |
| return 0; |
| |
| if (num < 0 || randomness < 0.0) |
| return 0; |
| |
| if (randomness > (double)drbg->max_entropylen) { |
| /* |
| * The purpose of this check is to bound |randomness| by a |
| * relatively small value in order to prevent an integer |
| * overflow when multiplying by 8 in the rand_drbg_restart() |
| * call below. |
| */ |
| return 0; |
| } |
| |
| CRYPTO_THREAD_write_lock(drbg->lock); |
| ret = rand_drbg_restart(drbg, buf, |
| (size_t)(unsigned int)num, |
| (size_t)(8*randomness)); |
| CRYPTO_THREAD_unlock(drbg->lock); |
| |
| return ret; |
| } |
| |
| /* Implements the default OpenSSL RAND_seed() method */ |
| static int drbg_seed(const void *buf, int num) |
| { |
| return drbg_add(buf, num, num); |
| } |
| |
| /* Implements the default OpenSSL RAND_status() method */ |
| static int drbg_status(void) |
| { |
| int ret; |
| RAND_DRBG *drbg = RAND_DRBG_get0_global(); |
| |
| if (drbg == NULL) |
| return 0; |
| |
| CRYPTO_THREAD_write_lock(drbg->lock); |
| ret = drbg->state == DRBG_READY ? 1 : 0; |
| CRYPTO_THREAD_unlock(drbg->lock); |
| return ret; |
| } |
| |
| /* |
| * Get the global public DRBG. |
| * Returns pointer to the DRBG on success, NULL on failure. |
| */ |
| RAND_DRBG *RAND_DRBG_get0_global(void) |
| { |
| if (!RUN_ONCE(&rand_drbg_init, do_rand_drbg_init)) |
| return NULL; |
| |
| return &rand_drbg; |
| } |
| |
| /* |
| * Get the global private DRBG. |
| * Returns pointer to the DRBG on success, NULL on failure. |
| */ |
| RAND_DRBG *RAND_DRBG_get0_priv_global(void) |
| { |
| if (!RUN_ONCE(&rand_drbg_init, do_rand_drbg_init)) |
| return NULL; |
| |
| return &priv_drbg; |
| } |
| |
| RAND_METHOD rand_meth = { |
| drbg_seed, |
| drbg_bytes, |
| NULL, |
| drbg_add, |
| drbg_bytes, |
| drbg_status |
| }; |
| |
| RAND_METHOD *RAND_OpenSSL(void) |
| { |
| return &rand_meth; |
| } |
