| /* |
| * Copyright 2011-2020 The OpenSSL Project Authors. All Rights Reserved. |
| * |
| * Licensed under the Apache License 2.0 (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 |
| */ |
| |
| /* |
| * RAND_DRBG_set is deprecated for public use, but still ok for |
| * internal use. |
| */ |
| #include "internal/deprecated.h" |
| |
| #include <string.h> |
| #include <openssl/crypto.h> |
| #include <openssl/err.h> |
| #include <openssl/rand.h> |
| #include <openssl/core_names.h> |
| #include "rand_local.h" |
| #include "internal/thread_once.h" |
| #include "crypto/rand.h" |
| #include "crypto/cryptlib.h" |
| |
| /* |
| * Support framework for NIST SP 800-90A DRBG |
| * |
| * See manual page RAND_DRBG(7) for a general overview. |
| * |
| * 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.) |
| */ |
| |
| |
| typedef struct drbg_global_st { |
| /* |
| * The three shared DRBG instances |
| * |
| * There are three shared DRBG instances: <primary>, <public>, and |
| * <private>. The <public> and <private> DRBGs are secondary ones. |
| * These are used for non-secret (e.g. nonces) and secret |
| * (e.g. private keys) data respectively. |
| */ |
| CRYPTO_RWLOCK *lock; |
| |
| /* |
| * The <primary> DRBG |
| * |
| * Not used directly by the application, only for reseeding the two other |
| * DRBGs. It reseeds itself by pulling either randomness from os entropy |
| * sources or by consuming randomness which was added by RAND_add(). |
| * |
| * The <primary> DRBG is a global instance which is accessed concurrently by |
| * all threads. The necessary locking is managed automatically by its child |
| * DRBG instances during reseeding. |
| */ |
| RAND_DRBG *primary_drbg; |
| /* |
| * The <public> DRBG |
| * |
| * Used by default for generating random bytes using RAND_bytes(). |
| * |
| * The <public> secondary DRBG is thread-local, i.e., there is one instance |
| * per thread. |
| */ |
| CRYPTO_THREAD_LOCAL public_drbg; |
| /* |
| * The <private> DRBG |
| * |
| * Used by default for generating private keys using RAND_priv_bytes() |
| * |
| * The <private> secondary DRBG is thread-local, i.e., there is one |
| * instance per thread. |
| */ |
| CRYPTO_THREAD_LOCAL private_drbg; |
| } DRBG_GLOBAL; |
| |
| #define RAND_DRBG_TYPE_FLAGS ( \ |
| RAND_DRBG_FLAG_PRIMARY | RAND_DRBG_FLAG_PUBLIC | RAND_DRBG_FLAG_PRIVATE ) |
| |
| #define RAND_DRBG_TYPE_PRIMARY 0 |
| #define RAND_DRBG_TYPE_PUBLIC 1 |
| #define RAND_DRBG_TYPE_PRIVATE 2 |
| |
| /* Defaults */ |
| static int rand_drbg_type[3] = { |
| RAND_DRBG_TYPE, /* Primary */ |
| RAND_DRBG_TYPE, /* Public */ |
| RAND_DRBG_TYPE /* Private */ |
| }; |
| static unsigned int rand_drbg_flags[3] = { |
| RAND_DRBG_FLAGS | RAND_DRBG_FLAG_PRIMARY, /* Primary */ |
| RAND_DRBG_FLAGS | RAND_DRBG_FLAG_PUBLIC, /* Public */ |
| RAND_DRBG_FLAGS | RAND_DRBG_FLAG_PRIVATE /* Private */ |
| }; |
| |
| static unsigned int primary_reseed_interval = PRIMARY_RESEED_INTERVAL; |
| static unsigned int secondary_reseed_interval = SECONDARY_RESEED_INTERVAL; |
| |
| static time_t primary_reseed_time_interval = PRIMARY_RESEED_TIME_INTERVAL; |
| static time_t secondary_reseed_time_interval = SECONDARY_RESEED_TIME_INTERVAL; |
| |
| /* A logical OR of all used DRBG flag bits (currently there is only one) */ |
| static const unsigned int rand_drbg_used_flags = |
| RAND_DRBG_FLAG_CTR_NO_DF | RAND_DRBG_FLAG_HMAC | RAND_DRBG_TYPE_FLAGS; |
| |
| |
| static RAND_DRBG *drbg_setup(OPENSSL_CTX *ctx, RAND_DRBG *parent, |
| int drbg_type); |
| |
| static int get_drbg_params(int type, unsigned int flags, const char **name, |
| OSSL_PARAM params[3]) |
| { |
| OSSL_PARAM *p = params; |
| |
| switch (type) { |
| case 0: |
| return 1; |
| default: |
| return 0; |
| |
| #define CTR(v) \ |
| *name = "CTR-DRBG"; \ |
| *p++ = OSSL_PARAM_construct_utf8_string(OSSL_DRBG_PARAM_CIPHER, v, 0) |
| |
| case NID_aes_128_ctr: |
| CTR(SN_aes_128_ctr); |
| break; |
| case NID_aes_192_ctr: |
| CTR(SN_aes_192_ctr); |
| break; |
| case NID_aes_256_ctr: |
| CTR(SN_aes_256_ctr); |
| break; |
| |
| #define DGST(v) \ |
| *p++ = OSSL_PARAM_construct_utf8_string(OSSL_DRBG_PARAM_DIGEST, v, 0); \ |
| if ((flags & RAND_DRBG_FLAG_HMAC) == 0) { \ |
| *name = "HASH-DRBG"; \ |
| } else { \ |
| *name = "HMAC-DRBG"; \ |
| *p++ = OSSL_PARAM_construct_utf8_string(OSSL_DRBG_PARAM_MAC, \ |
| SN_hmac, 0); \ |
| } |
| |
| case NID_sha1: |
| DGST(SN_sha1); |
| break; |
| case NID_sha224: |
| DGST(SN_sha224); |
| break; |
| case NID_sha256: |
| DGST(SN_sha256); |
| break; |
| case NID_sha384: |
| DGST(SN_sha384); |
| break; |
| case NID_sha512: |
| DGST(SN_sha512); |
| break; |
| case NID_sha512_224: |
| DGST(SN_sha512_224); |
| break; |
| case NID_sha512_256: |
| DGST(SN_sha512_256); |
| break; |
| case NID_sha3_224: |
| DGST(SN_sha3_224); |
| break; |
| case NID_sha3_256: |
| DGST(SN_sha3_256); |
| break; |
| case NID_sha3_384: |
| DGST(SN_sha3_384); |
| break; |
| case NID_sha3_512: |
| DGST(SN_sha3_512); |
| } |
| *p = OSSL_PARAM_construct_end(); |
| return 1; |
| } |
| |
| /* |
| * Initialize the OPENSSL_CTX global DRBGs on first use. |
| * Returns the allocated global data on success or NULL on failure. |
| */ |
| static void *drbg_ossl_ctx_new(OPENSSL_CTX *libctx) |
| { |
| DRBG_GLOBAL *dgbl = OPENSSL_zalloc(sizeof(*dgbl)); |
| |
| if (dgbl == NULL) |
| return NULL; |
| |
| #ifndef FIPS_MODULE |
| /* |
| * We need to ensure that base libcrypto thread handling has been |
| * initialised. |
| */ |
| OPENSSL_init_crypto(0, NULL); |
| #endif |
| |
| dgbl->lock = CRYPTO_THREAD_lock_new(); |
| if (dgbl->lock == NULL) |
| goto err0; |
| |
| if (!CRYPTO_THREAD_init_local(&dgbl->private_drbg, NULL)) |
| goto err1; |
| |
| if (!CRYPTO_THREAD_init_local(&dgbl->public_drbg, NULL)) |
| goto err2; |
| |
| return dgbl; |
| |
| err2: |
| CRYPTO_THREAD_cleanup_local(&dgbl->private_drbg); |
| err1: |
| CRYPTO_THREAD_lock_free(dgbl->lock); |
| err0: |
| OPENSSL_free(dgbl); |
| return NULL; |
| } |
| |
| static void drbg_ossl_ctx_free(void *vdgbl) |
| { |
| DRBG_GLOBAL *dgbl = vdgbl; |
| |
| if (dgbl == NULL) |
| return; |
| |
| CRYPTO_THREAD_lock_free(dgbl->lock); |
| RAND_DRBG_free(dgbl->primary_drbg); |
| CRYPTO_THREAD_cleanup_local(&dgbl->private_drbg); |
| CRYPTO_THREAD_cleanup_local(&dgbl->public_drbg); |
| |
| OPENSSL_free(dgbl); |
| } |
| |
| static const OPENSSL_CTX_METHOD drbg_ossl_ctx_method = { |
| drbg_ossl_ctx_new, |
| drbg_ossl_ctx_free, |
| }; |
| |
| static DRBG_GLOBAL *drbg_get_global(OPENSSL_CTX *libctx) |
| { |
| return openssl_ctx_get_data(libctx, OPENSSL_CTX_DRBG_INDEX, |
| &drbg_ossl_ctx_method); |
| } |
| |
| /* |
| * Set the |drbg|'s callback data pointer for the entropy and nonce callbacks |
| * |
| * The ownership of the context data remains with the caller, |
| * i.e., it is the caller's responsibility to keep it available as long |
| * as it is need by the callbacks and free it after use. |
| * |
| * Setting the callback data is allowed only if the drbg has not been |
| * initialized yet. Otherwise, the operation will fail. |
| * |
| * Returns 1 on success, 0 on failure. |
| */ |
| int RAND_DRBG_set_callback_data(RAND_DRBG *drbg, void *data) |
| { |
| if (EVP_RAND_state(drbg->rand) != EVP_RAND_STATE_UNINITIALISED |
| || drbg->parent != NULL) |
| return 0; |
| |
| drbg->callback_data = data; |
| return 1; |
| } |
| |
| /* Retrieve the callback data pointer */ |
| void *RAND_DRBG_get_callback_data(RAND_DRBG *drbg) |
| { |
| return drbg->callback_data; |
| } |
| |
| /* |
| * Set/initialize |drbg| to be of type |type|, with optional |flags|. |
| * |
| * If |type| and |flags| are zero, use the defaults |
| * |
| * Returns 1 on success, 0 on failure. |
| */ |
| int RAND_DRBG_set(RAND_DRBG *drbg, int type, unsigned int flags) |
| { |
| OSSL_PARAM params[6], *p = params; |
| unsigned int reseed_interval; |
| time_t reseed_time_interval; |
| const char *name = NULL; |
| EVP_RAND *rand; |
| EVP_RAND_CTX *pctx; |
| int use_df; |
| |
| RAND_DRBG_get_entropy_fn get_entropy = drbg->get_entropy; |
| RAND_DRBG_cleanup_entropy_fn cleanup_entropy = drbg->cleanup_entropy; |
| RAND_DRBG_get_nonce_fn get_nonce = drbg->get_nonce; |
| RAND_DRBG_cleanup_nonce_fn cleanup_nonce = drbg->cleanup_nonce; |
| |
| if (type == 0 && flags == 0) { |
| type = rand_drbg_type[RAND_DRBG_TYPE_PRIMARY]; |
| flags = rand_drbg_flags[RAND_DRBG_TYPE_PRIMARY]; |
| } |
| |
| if (drbg->parent == NULL) { |
| reseed_interval = primary_reseed_interval; |
| reseed_time_interval = primary_reseed_time_interval; |
| } else { |
| reseed_interval = secondary_reseed_interval; |
| reseed_time_interval = secondary_reseed_time_interval; |
| } |
| *p++ = OSSL_PARAM_construct_uint(OSSL_DRBG_PARAM_RESEED_REQUESTS, |
| &reseed_interval); |
| *p++ = OSSL_PARAM_construct_time_t(OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL, |
| &reseed_time_interval); |
| use_df = (flags & RAND_DRBG_FLAG_CTR_NO_DF) == 0; |
| *p++ = OSSL_PARAM_construct_int(OSSL_DRBG_PARAM_USE_DF, &use_df); |
| |
| if (!get_drbg_params(type, flags, &name, p)) { |
| RANDerr(0, RAND_R_UNSUPPORTED_DRBG_TYPE); |
| return 0; |
| } |
| |
| rand = EVP_RAND_fetch(drbg->libctx, name, NULL); |
| if (rand == NULL) { |
| RANDerr(0, RAND_R_NO_DRBG_IMPLEMENTATION_SELECTED); |
| return 0; |
| } |
| |
| EVP_RAND_CTX_free(drbg->rand); |
| drbg->rand = NULL; |
| |
| drbg->flags = flags; |
| drbg->type = type; |
| |
| pctx = drbg->parent != NULL ? drbg->parent->rand : NULL; |
| drbg->rand = EVP_RAND_CTX_new(rand, pctx); |
| EVP_RAND_free(rand); |
| if (drbg->rand == NULL) { |
| RANDerr(0, RAND_R_NO_DRBG_IMPLEMENTATION_SELECTED); |
| goto err; |
| } |
| |
| if (!EVP_RAND_set_ctx_params(drbg->rand, params)) { |
| RANDerr(0, RAND_R_ERROR_INITIALISING_DRBG); |
| goto err; |
| } |
| |
| if (!RAND_DRBG_set_callbacks(drbg, |
| get_entropy, cleanup_entropy, |
| get_nonce, cleanup_nonce)) { |
| RANDerr(0, RAND_R_ERROR_INITIALISING_DRBG); |
| goto err; |
| } |
| |
| return 1; |
| err: |
| EVP_RAND_CTX_free(drbg->rand); |
| drbg->rand = NULL; |
| drbg->type = 0; |
| drbg->flags = 0; |
| return 0; |
| } |
| |
| /* |
| * Set/initialize default |type| and |flag| for new drbg instances. |
| * |
| * Returns 1 on success, 0 on failure. |
| */ |
| int RAND_DRBG_set_defaults(int type, unsigned int flags) |
| { |
| int all; |
| const char *name; |
| OSSL_PARAM params[3]; |
| |
| if (!get_drbg_params(type, flags, &name, params)) { |
| RANDerr(RAND_F_RAND_DRBG_SET_DEFAULTS, RAND_R_UNSUPPORTED_DRBG_TYPE); |
| return 0; |
| } |
| |
| if ((flags & ~rand_drbg_used_flags) != 0) { |
| RANDerr(RAND_F_RAND_DRBG_SET_DEFAULTS, RAND_R_UNSUPPORTED_DRBG_FLAGS); |
| return 0; |
| } |
| |
| all = ((flags & RAND_DRBG_TYPE_FLAGS) == 0); |
| if (all || (flags & RAND_DRBG_FLAG_PRIMARY) != 0) { |
| rand_drbg_type[RAND_DRBG_TYPE_PRIMARY] = type; |
| rand_drbg_flags[RAND_DRBG_TYPE_PRIMARY] = flags |
| | RAND_DRBG_FLAG_PRIMARY; |
| } |
| if (all || (flags & RAND_DRBG_FLAG_PUBLIC) != 0) { |
| rand_drbg_type[RAND_DRBG_TYPE_PUBLIC] = type; |
| rand_drbg_flags[RAND_DRBG_TYPE_PUBLIC] = flags | RAND_DRBG_FLAG_PUBLIC; |
| } |
| if (all || (flags & RAND_DRBG_FLAG_PRIVATE) != 0) { |
| rand_drbg_type[RAND_DRBG_TYPE_PRIVATE] = type; |
| rand_drbg_flags[RAND_DRBG_TYPE_PRIVATE] = flags |
| | RAND_DRBG_FLAG_PRIVATE; |
| } |
| return 1; |
| } |
| |
| |
| /* |
| * Allocate memory and initialize a new DRBG. |
| * The |parent|, if not NULL, will be used as random source for reseeding. |
| * |
| * Returns a pointer to the new DRBG instance on success, NULL on failure. |
| */ |
| static RAND_DRBG *rand_drbg_new(OPENSSL_CTX *ctx, |
| 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); |
| return NULL; |
| } |
| |
| drbg->libctx = ctx; |
| drbg->parent = parent; |
| |
| if (RAND_DRBG_set(drbg, type, flags) == 0) |
| goto err; |
| |
| return drbg; |
| |
| err: |
| RAND_DRBG_free(drbg); |
| |
| return NULL; |
| } |
| |
| RAND_DRBG *RAND_DRBG_new_ex(OPENSSL_CTX *ctx, int type, unsigned int flags, |
| RAND_DRBG *parent) |
| { |
| return rand_drbg_new(ctx, type, flags, parent); |
| } |
| |
| RAND_DRBG *RAND_DRBG_new(int type, unsigned int flags, RAND_DRBG *parent) |
| { |
| return RAND_DRBG_new_ex(NULL, type, flags, parent); |
| } |
| |
| /* |
| * Uninstantiate |drbg| and free all memory. |
| */ |
| void RAND_DRBG_free(RAND_DRBG *drbg) |
| { |
| if (drbg == NULL) |
| return; |
| |
| CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RAND_DRBG, drbg, &drbg->ex_data); |
| EVP_RAND_CTX_free(drbg->rand); |
| OPENSSL_free(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. |
| * |
| * Returns 1 on success, 0 on failure. |
| */ |
| int RAND_DRBG_instantiate(RAND_DRBG *drbg, |
| const unsigned char *pers, size_t perslen) |
| { |
| return EVP_RAND_instantiate(drbg->rand, EVP_RAND_strength(drbg->rand), 0, |
| pers, perslen); |
| } |
| |
| /* |
| * Uninstantiate |drbg|. Must be instantiated before it can be used. |
| * |
| * Requires that drbg->lock is already locked for write, if non-null. |
| * |
| * Returns 1 on success, 0 on failure. |
| */ |
| int RAND_DRBG_uninstantiate(RAND_DRBG *drbg) |
| { |
| int index = -1, type, flags; |
| |
| if (!EVP_RAND_uninstantiate(drbg->rand)) |
| return 0; |
| |
| /* The reset uses the default values for type and flags */ |
| if (drbg->flags & RAND_DRBG_FLAG_PRIMARY) |
| index = RAND_DRBG_TYPE_PRIMARY; |
| else if (drbg->flags & RAND_DRBG_FLAG_PRIVATE) |
| index = RAND_DRBG_TYPE_PRIVATE; |
| else if (drbg->flags & RAND_DRBG_FLAG_PUBLIC) |
| index = RAND_DRBG_TYPE_PUBLIC; |
| |
| if (index != -1) { |
| flags = rand_drbg_flags[index]; |
| type = rand_drbg_type[index]; |
| } else { |
| flags = drbg->flags; |
| type = drbg->type; |
| } |
| return RAND_DRBG_set(drbg, type, flags); |
| } |
| |
| /* |
| * Reseed |drbg|, mixing in the specified data |
| * |
| * Requires that drbg->lock is already locked for write, if non-null. |
| * |
| * Returns 1 on success, 0 on failure. |
| */ |
| int RAND_DRBG_reseed(RAND_DRBG *drbg, |
| const unsigned char *adin, size_t adinlen, |
| int prediction_resistance) |
| { |
| return EVP_RAND_reseed(drbg->rand, prediction_resistance, NULL, 0, |
| adin, adinlen); |
| } |
| |
| /* |
| * 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) |
| { |
| return EVP_RAND_generate(drbg->rand, out, outlen, 0, |
| prediction_resistance, adin, adinlen); |
| } |
| |
| /* |
| * Generates |outlen| random bytes and stores them in |out|. It will |
| * using the given |drbg| to generate the bytes. |
| * |
| * Requires that drbg->lock is already locked for write, if non-null. |
| * |
| * Returns 1 on success 0 on failure. |
| */ |
| int RAND_DRBG_bytes(RAND_DRBG *drbg, unsigned char *out, size_t outlen) |
| { |
| return EVP_RAND_generate(drbg->rand, out, outlen, 0, 0, NULL, 0); |
| } |
| |
| /* DRBG call back shims */ |
| static int rand_drbg_get_entroy_cb(const OSSL_PARAM *params, OSSL_PARAM *out, |
| void *vdrbg) |
| { |
| RAND_DRBG *drbg = (RAND_DRBG *)vdrbg; |
| int entropy = 0, prediction_resistance = 0; |
| size_t min_len = 0, max_len = 2048; |
| const OSSL_PARAM *p; |
| OSSL_PARAM *q; |
| |
| if (drbg->get_entropy == NULL) |
| return 0; |
| |
| p = OSSL_PARAM_locate_const(params, OSSL_DRBG_PARAM_ENTROPY_REQUIRED); |
| if (p == NULL || !OSSL_PARAM_get_int(p, &entropy)) |
| return 0; |
| |
| p = OSSL_PARAM_locate_const(params, OSSL_DRBG_PARAM_PREDICTION_RESISTANCE); |
| if (p == NULL || !OSSL_PARAM_get_int(p, &prediction_resistance)) |
| return 0; |
| |
| p = OSSL_PARAM_locate_const(params, OSSL_DRBG_PARAM_MAX_LENGTH); |
| if (p == NULL || !OSSL_PARAM_get_size_t(p, &max_len)) |
| return 0; |
| |
| p = OSSL_PARAM_locate_const(params, OSSL_DRBG_PARAM_MIN_LENGTH); |
| if (p == NULL || !OSSL_PARAM_get_size_t(p, &min_len)) |
| return 0; |
| |
| q = OSSL_PARAM_locate(out, OSSL_DRBG_PARAM_RANDOM_DATA); |
| if (q == NULL || q->data_type != OSSL_PARAM_OCTET_PTR || q->data == NULL) |
| return 0; |
| |
| q->return_size = drbg->get_entropy(drbg, (unsigned char **)q->data, entropy, |
| min_len, max_len, prediction_resistance); |
| return 1; |
| } |
| |
| static int rand_drbg_cleanup_entropy_cb(const OSSL_PARAM *params, void *vdrbg) |
| { |
| RAND_DRBG *drbg = (RAND_DRBG *)vdrbg; |
| const OSSL_PARAM *p; |
| size_t sz; |
| |
| if (drbg->cleanup_entropy == NULL) |
| return 0; |
| |
| p = OSSL_PARAM_locate_const(params, OSSL_DRBG_PARAM_SIZE); |
| if (p == NULL || !OSSL_PARAM_get_size_t(p, &sz)) |
| return 0; |
| |
| p = OSSL_PARAM_locate_const(params, OSSL_DRBG_PARAM_RANDOM_DATA); |
| if (p == NULL || p->data_type != OSSL_PARAM_OCTET_PTR) |
| return 0; |
| |
| drbg->cleanup_entropy(drbg, p->data, sz); |
| return 1; |
| } |
| |
| static int rand_drbg_get_nonce_cb(const OSSL_PARAM *params, OSSL_PARAM *out, |
| void *vdrbg) |
| { |
| RAND_DRBG *drbg = (RAND_DRBG *)vdrbg; |
| int entropy = 0; |
| size_t min_len = 0, max_len = 10240; |
| const OSSL_PARAM *p; |
| OSSL_PARAM *q; |
| |
| if (drbg->get_nonce == NULL) |
| return 0; |
| |
| p = OSSL_PARAM_locate_const(params, OSSL_DRBG_PARAM_ENTROPY_REQUIRED); |
| if (p == NULL || !OSSL_PARAM_get_int(p, &entropy)) |
| return 0; |
| |
| p = OSSL_PARAM_locate_const(params, OSSL_DRBG_PARAM_MAX_LENGTH); |
| if (p == NULL || !OSSL_PARAM_get_size_t(p, &max_len)) |
| return 0; |
| |
| p = OSSL_PARAM_locate_const(params, OSSL_DRBG_PARAM_MIN_LENGTH); |
| if (p == NULL || !OSSL_PARAM_get_size_t(p, &min_len)) |
| return 0; |
| |
| q = OSSL_PARAM_locate(out, OSSL_DRBG_PARAM_RANDOM_DATA); |
| if (q == NULL || q->data_type != OSSL_PARAM_OCTET_PTR || q->data == NULL) |
| return 0; |
| |
| q->return_size = drbg->get_nonce(drbg, (unsigned char **)q->data, entropy, |
| min_len, max_len); |
| return 1; |
| } |
| |
| static int rand_drbg_cleanup_nonce_cb(const OSSL_PARAM *params, void *vdrbg) |
| { |
| RAND_DRBG *drbg = (RAND_DRBG *)vdrbg; |
| const OSSL_PARAM *p; |
| size_t sz; |
| |
| if (drbg->cleanup_nonce == NULL) |
| return 0; |
| |
| p = OSSL_PARAM_locate_const(params, OSSL_DRBG_PARAM_SIZE); |
| if (p == NULL || !OSSL_PARAM_get_size_t(p, &sz)) |
| return 0; |
| |
| p = OSSL_PARAM_locate_const(params, OSSL_DRBG_PARAM_RANDOM_DATA); |
| if (p == NULL || p->data_type != OSSL_PARAM_OCTET_PTR) |
| return 0; |
| |
| drbg->cleanup_nonce(drbg, p->data, sz); |
| return 1; |
| } |
| |
| /* |
| * Set the RAND_DRBG callbacks for obtaining entropy and nonce. |
| * |
| * Setting the callbacks is allowed only if the drbg has not been |
| * initialized yet. Otherwise, the operation will fail. |
| * |
| * Returns 1 on success, 0 on failure. |
| */ |
| 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) |
| { |
| EVP_RAND_CTX *rand = drbg->rand; |
| OSSL_INOUT_CALLBACK *g_ent = NULL, *g_nonce = NULL; |
| OSSL_CALLBACK *c_ent = NULL, *c_nonce = NULL; |
| |
| if (get_entropy != NULL) { |
| g_ent = &rand_drbg_get_entroy_cb; |
| c_ent = &rand_drbg_cleanup_entropy_cb; |
| } |
| if (get_nonce != NULL) { |
| g_nonce = rand_drbg_get_nonce_cb; |
| c_nonce = rand_drbg_cleanup_nonce_cb; |
| } |
| if (!EVP_RAND_set_callbacks(rand, g_ent, c_ent, g_nonce, c_nonce, drbg)) |
| return 0; |
| |
| drbg->get_entropy = g_ent != NULL ? get_entropy : NULL; |
| drbg->cleanup_entropy = c_ent != NULL ? cleanup_entropy : NULL; |
| drbg->get_nonce = g_nonce != NULL ? get_nonce : NULL; |
| drbg->cleanup_nonce = c_nonce != NULL ? cleanup_nonce : NULL; |
| return 1; |
| } |
| |
| /* |
| * Set the reseed interval. |
| * |
| * The drbg will reseed automatically whenever the number of generate |
| * requests exceeds the given reseed interval. If the reseed interval |
| * is 0, then this feature is disabled. |
| * |
| * Returns 1 on success, 0 on failure. |
| */ |
| int RAND_DRBG_set_reseed_interval(RAND_DRBG *drbg, unsigned int interval) |
| { |
| OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END }; |
| |
| if (interval > MAX_RESEED_INTERVAL) |
| return 0; |
| params[0] = OSSL_PARAM_construct_uint(OSSL_DRBG_PARAM_RESEED_REQUESTS, |
| &interval); |
| return EVP_RAND_set_ctx_params(drbg->rand, params); |
| } |
| |
| /* |
| * Set the reseed time interval. |
| * |
| * The drbg will reseed automatically whenever the time elapsed since |
| * the last reseeding exceeds the given reseed time interval. For safety, |
| * a reseeding will also occur if the clock has been reset to a smaller |
| * value. |
| * |
| * Returns 1 on success, 0 on failure. |
| */ |
| int RAND_DRBG_set_reseed_time_interval(RAND_DRBG *drbg, time_t interval) |
| { |
| OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END }; |
| |
| if (interval > MAX_RESEED_TIME_INTERVAL) |
| return 0; |
| params[0] = |
| OSSL_PARAM_construct_time_t(OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL, |
| &interval); |
| return EVP_RAND_set_ctx_params(drbg->rand, params); |
| } |
| |
| /* |
| * Set the default values for reseed (time) intervals of new DRBG instances |
| * |
| * The default values can be set independently for primary DRBG instances |
| * (without a parent) and secondary DRBG instances (with parent). |
| * |
| * Returns 1 on success, 0 on failure. |
| */ |
| |
| int RAND_DRBG_set_reseed_defaults( |
| unsigned int _primary_reseed_interval, |
| unsigned int _secondary_reseed_interval, |
| time_t _primary_reseed_time_interval, |
| time_t _secondary_reseed_time_interval |
| ) |
| { |
| if (_primary_reseed_interval > MAX_RESEED_INTERVAL |
| || _secondary_reseed_interval > MAX_RESEED_INTERVAL) |
| return 0; |
| |
| if (_primary_reseed_time_interval > MAX_RESEED_TIME_INTERVAL |
| || _secondary_reseed_time_interval > MAX_RESEED_TIME_INTERVAL) |
| return 0; |
| |
| primary_reseed_interval = _primary_reseed_interval; |
| secondary_reseed_interval = _secondary_reseed_interval; |
| |
| primary_reseed_time_interval = _primary_reseed_time_interval; |
| secondary_reseed_time_interval = _secondary_reseed_time_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. |
| */ |
| |
| /* |
| * Allocates a new global DRBG on the secure heap (if enabled) and |
| * initializes it with default settings. |
| * |
| * Returns a pointer to the new DRBG instance on success, NULL on failure. |
| */ |
| static RAND_DRBG *drbg_setup(OPENSSL_CTX *ctx, RAND_DRBG *parent, int drbg_type) |
| { |
| RAND_DRBG *drbg; |
| |
| drbg = RAND_DRBG_new_ex(ctx, rand_drbg_type[drbg_type], |
| rand_drbg_flags[drbg_type], parent); |
| if (drbg == NULL) |
| return NULL; |
| |
| /* Only the primary DRBG needs to have a lock */ |
| if (parent == NULL && EVP_RAND_enable_locking(drbg->rand) == 0) |
| goto err; |
| |
| /* |
| * Ignore instantiation error to support just-in-time instantiation. |
| * |
| * The state of the drbg will be checked in RAND_DRBG_generate() and |
| * an automatic recovery is attempted. |
| */ |
| (void)RAND_DRBG_instantiate(drbg, NULL, 0); |
| return drbg; |
| |
| err: |
| RAND_DRBG_free(drbg); |
| return NULL; |
| } |
| |
| static void drbg_delete_thread_state(void *arg) |
| { |
| OPENSSL_CTX *ctx = arg; |
| DRBG_GLOBAL *dgbl = drbg_get_global(ctx); |
| RAND_DRBG *drbg; |
| |
| if (dgbl == NULL) |
| return; |
| drbg = CRYPTO_THREAD_get_local(&dgbl->public_drbg); |
| CRYPTO_THREAD_set_local(&dgbl->public_drbg, NULL); |
| RAND_DRBG_free(drbg); |
| |
| drbg = CRYPTO_THREAD_get_local(&dgbl->private_drbg); |
| CRYPTO_THREAD_set_local(&dgbl->private_drbg, NULL); |
| RAND_DRBG_free(drbg); |
| } |
| |
| /* Implements the default OpenSSL RAND_bytes() method */ |
| static int drbg_bytes(unsigned char *out, int count) |
| { |
| int ret; |
| RAND_DRBG *drbg = RAND_DRBG_get0_public(); |
| |
| if (drbg == NULL) |
| return 0; |
| |
| ret = RAND_DRBG_bytes(drbg, out, count); |
| |
| return ret; |
| } |
| |
| /* Implements the default OpenSSL RAND_add() method */ |
| static int drbg_add(const void *buf, int num, double randomness) |
| { |
| RAND_DRBG *drbg = RAND_DRBG_get0_master(); |
| |
| if (drbg == NULL || num <= 0) |
| return 0; |
| |
| return EVP_RAND_reseed(drbg->rand, 0, NULL, 0, buf, num); |
| } |
| |
| /* 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_master(); |
| |
| if (drbg == NULL) |
| return 0; |
| |
| ret = EVP_RAND_state(drbg->rand) == EVP_RAND_STATE_READY ? 1 : 0; |
| return ret; |
| } |
| |
| int RAND_DRBG_verify_zeroization(RAND_DRBG *drbg) |
| { |
| return EVP_RAND_verify_zeroization(drbg->rand); |
| } |
| |
| /* |
| * Get the primary DRBG. |
| * Returns pointer to the DRBG on success, NULL on failure. |
| * |
| */ |
| RAND_DRBG *OPENSSL_CTX_get0_primary_drbg(OPENSSL_CTX *ctx) |
| { |
| DRBG_GLOBAL *dgbl = drbg_get_global(ctx); |
| |
| if (dgbl == NULL) |
| return NULL; |
| |
| if (dgbl->primary_drbg == NULL) { |
| if (!CRYPTO_THREAD_write_lock(dgbl->lock)) |
| return NULL; |
| if (dgbl->primary_drbg == NULL) |
| dgbl->primary_drbg = drbg_setup(ctx, NULL, RAND_DRBG_TYPE_PRIMARY); |
| CRYPTO_THREAD_unlock(dgbl->lock); |
| } |
| return dgbl->primary_drbg; |
| } |
| |
| RAND_DRBG *RAND_DRBG_get0_master(void) |
| { |
| return OPENSSL_CTX_get0_primary_drbg(NULL); |
| } |
| |
| /* |
| * Get the public DRBG. |
| * Returns pointer to the DRBG on success, NULL on failure. |
| */ |
| RAND_DRBG *OPENSSL_CTX_get0_public_drbg(OPENSSL_CTX *ctx) |
| { |
| DRBG_GLOBAL *dgbl = drbg_get_global(ctx); |
| RAND_DRBG *drbg, *primary; |
| |
| if (dgbl == NULL) |
| return NULL; |
| |
| drbg = CRYPTO_THREAD_get_local(&dgbl->public_drbg); |
| if (drbg == NULL) { |
| primary = OPENSSL_CTX_get0_primary_drbg(ctx); |
| if (primary == NULL) |
| return NULL; |
| |
| ctx = openssl_ctx_get_concrete(ctx); |
| /* |
| * If the private_drbg is also NULL then this is the first time we've |
| * used this thread. |
| */ |
| if (CRYPTO_THREAD_get_local(&dgbl->private_drbg) == NULL |
| && !ossl_init_thread_start(NULL, ctx, drbg_delete_thread_state)) |
| return NULL; |
| drbg = drbg_setup(ctx, primary, RAND_DRBG_TYPE_PUBLIC); |
| CRYPTO_THREAD_set_local(&dgbl->public_drbg, drbg); |
| } |
| return drbg; |
| } |
| |
| RAND_DRBG *RAND_DRBG_get0_public(void) |
| { |
| return OPENSSL_CTX_get0_public_drbg(NULL); |
| } |
| |
| /* |
| * Get the private DRBG. |
| * Returns pointer to the DRBG on success, NULL on failure. |
| */ |
| RAND_DRBG *OPENSSL_CTX_get0_private_drbg(OPENSSL_CTX *ctx) |
| { |
| DRBG_GLOBAL *dgbl = drbg_get_global(ctx); |
| RAND_DRBG *drbg, *primary; |
| |
| if (dgbl == NULL) |
| return NULL; |
| |
| drbg = CRYPTO_THREAD_get_local(&dgbl->private_drbg); |
| if (drbg == NULL) { |
| primary = OPENSSL_CTX_get0_primary_drbg(ctx); |
| if (primary == NULL) |
| return NULL; |
| |
| ctx = openssl_ctx_get_concrete(ctx); |
| /* |
| * If the public_drbg is also NULL then this is the first time we've |
| * used this thread. |
| */ |
| if (CRYPTO_THREAD_get_local(&dgbl->public_drbg) == NULL |
| && !ossl_init_thread_start(NULL, ctx, drbg_delete_thread_state)) |
| return NULL; |
| drbg = drbg_setup(ctx, primary, RAND_DRBG_TYPE_PRIVATE); |
| CRYPTO_THREAD_set_local(&dgbl->private_drbg, drbg); |
| } |
| return drbg; |
| } |
| |
| RAND_DRBG *RAND_DRBG_get0_private(void) |
| { |
| return OPENSSL_CTX_get0_private_drbg(NULL); |
| } |
| |
| RAND_METHOD rand_meth = { |
| drbg_seed, |
| drbg_bytes, |
| NULL, |
| drbg_add, |
| drbg_bytes, |
| drbg_status |
| }; |
| |
| RAND_METHOD *RAND_OpenSSL(void) |
| { |
| #ifndef FIPS_MODULE |
| return &rand_meth; |
| #else |
| return NULL; |
| #endif |
| } |
