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260 lines
10 KiB
C
260 lines
10 KiB
C
/*
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* Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#ifndef OSSL_CRYPTO_PROV_LOCAL_H
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# define OSSL_CRYPTO_PROV_LOCAL_H
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# include <openssl/evp.h>
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# include <openssl/core_dispatch.h>
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# include <openssl/core_names.h>
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# include <openssl/params.h>
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# include "internal/tsan_assist.h"
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# include "internal/nelem.h"
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# include "internal/numbers.h"
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# include "prov/provider_ctx.h"
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/* How many times to read the TSC as a randomness source. */
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# define TSC_READ_COUNT 4
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/* Maximum reseed intervals */
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# define MAX_RESEED_INTERVAL (1 << 24)
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# define MAX_RESEED_TIME_INTERVAL (1 << 20) /* approx. 12 days */
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/* Default reseed intervals */
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# define RESEED_INTERVAL (1 << 8)
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# define TIME_INTERVAL (60*60) /* 1 hour */
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/*
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* The number of bytes that constitutes an atomic lump of entropy with respect
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* to the FIPS 140-2 section 4.9.2 Conditional Tests. The size is somewhat
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* arbitrary, the smaller the value, the less entropy is consumed on first
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* read but the higher the probability of the test failing by accident.
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*
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* The value is in bytes.
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*/
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#define CRNGT_BUFSIZ 16
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/*
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* Maximum input size for the DRBG (entropy, nonce, personalization string)
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*
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* NIST SP800 90Ar1 allows a maximum of (1 << 35) bits i.e., (1 << 32) bytes.
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*
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* We lower it to 'only' INT32_MAX bytes, which is equivalent to 2 gigabytes.
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*/
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# define DRBG_MAX_LENGTH INT32_MAX
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/* The default nonce */
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#ifdef CHARSET_EBCDIC
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# define DRBG_DEFAULT_PERS_STRING { 0x4f, 0x70, 0x65, 0x6e, 0x53, 0x53, \
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0x4c, 0x20, 0x4e, 0x49, 0x53, 0x54, 0x20, 0x53, 0x50, 0x20, 0x38, 0x30, \
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0x30, 0x2d, 0x39, 0x30, 0x41, 0x20, 0x44, 0x52, 0x42, 0x47, 0x00};
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#else
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# define DRBG_DEFAULT_PERS_STRING "OpenSSL NIST SP 800-90A DRBG"
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#endif
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typedef struct prov_drbg_st PROV_DRBG;
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/* DRBG status values */
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typedef enum drbg_status_e {
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DRBG_UNINITIALISED,
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DRBG_READY,
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DRBG_ERROR
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} DRBG_STATUS;
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/*
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* The state of all types of DRBGs.
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*/
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struct prov_drbg_st {
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CRYPTO_RWLOCK *lock;
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PROV_CTX *provctx;
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/* Virtual functions are cache here */
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int (*instantiate)(PROV_DRBG *drbg,
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const unsigned char *entropy, size_t entropylen,
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const unsigned char *nonce, size_t noncelen,
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const unsigned char *pers, size_t perslen);
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int (*uninstantiate)(PROV_DRBG *ctx);
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int (*reseed)(PROV_DRBG *drbg, const unsigned char *ent, size_t ent_len,
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const unsigned char *adin, size_t adin_len);
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int (*generate)(PROV_DRBG *, unsigned char *out, size_t outlen,
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const unsigned char *adin, size_t adin_len);
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/* Parent PROV_RAND and its dispatch table functions */
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void *parent;
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OSSL_FUNC_rand_enable_locking_fn *parent_enable_locking;
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OSSL_FUNC_rand_lock_fn *parent_lock;
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OSSL_FUNC_rand_unlock_fn *parent_unlock;
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OSSL_FUNC_rand_get_ctx_params_fn *parent_get_ctx_params;
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OSSL_FUNC_rand_nonce_fn *parent_nonce;
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OSSL_FUNC_rand_get_seed_fn *parent_get_seed;
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OSSL_FUNC_rand_clear_seed_fn *parent_clear_seed;
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const OSSL_DISPATCH *parent_dispatch;
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/*
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* Stores the return value of openssl_get_fork_id() as of when we last
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* reseeded. The DRBG reseeds automatically whenever drbg->fork_id !=
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* openssl_get_fork_id(). Used to provide fork-safety and reseed this
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* DRBG in the child process.
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*/
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int fork_id;
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unsigned short flags; /* various external flags */
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/*
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* The following parameters are setup by the per-type "init" function.
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*
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* The supported types and their init functions are:
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* (1) CTR_DRBG: drbg_ctr_init().
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* (2) HMAC_DRBG: drbg_hmac_init().
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* (3) HASH_DRBG: drbg_hash_init().
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*
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* The parameters are closely related to the ones described in
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* section '10.2.1 CTR_DRBG' of [NIST SP 800-90Ar1], with one
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* crucial difference: In the NIST standard, all counts are given
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* in bits, whereas in OpenSSL entropy counts are given in bits
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* and buffer lengths are given in bytes.
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*
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* Since this difference has lead to some confusion in the past,
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* (see [GitHub Issue #2443], formerly [rt.openssl.org #4055])
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* the 'len' suffix has been added to all buffer sizes for
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* clarification.
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*/
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unsigned int strength;
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size_t max_request;
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size_t min_entropylen, max_entropylen;
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size_t min_noncelen, max_noncelen;
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size_t max_perslen, max_adinlen;
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/*
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* Counts the number of generate requests since the last reseed
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* (Starts at 1). This value is the reseed_counter as defined in
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* NIST SP 800-90Ar1
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*/
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unsigned int generate_counter;
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/*
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* Maximum number of generate requests until a reseed is required.
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* This value is ignored if it is zero.
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*/
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unsigned int reseed_interval;
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/* Stores the time when the last reseeding occurred */
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time_t reseed_time;
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/*
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* Specifies the maximum time interval (in seconds) between reseeds.
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* This value is ignored if it is zero.
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*/
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time_t reseed_time_interval;
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/*
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* Counts the number of reseeds since instantiation.
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* This value is ignored if it is zero.
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*
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* This counter is used only for seed propagation from the <master> DRBG
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* to its two children, the <public> and <private> DRBG. This feature is
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* very special and its sole purpose is to ensure that any randomness which
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* is added by PROV_add() or PROV_seed() will have an immediate effect on
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* the output of PROV_bytes() resp. PROV_priv_bytes().
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*/
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TSAN_QUALIFIER unsigned int reseed_counter;
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unsigned int reseed_next_counter;
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unsigned int parent_reseed_counter;
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size_t seedlen;
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DRBG_STATUS state;
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/* DRBG specific data */
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void *data;
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/* Entropy and nonce gathering callbacks */
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void *callback_arg;
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OSSL_INOUT_CALLBACK *get_entropy_fn;
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OSSL_CALLBACK *cleanup_entropy_fn;
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OSSL_INOUT_CALLBACK *get_nonce_fn;
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OSSL_CALLBACK *cleanup_nonce_fn;
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};
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PROV_DRBG *ossl_rand_drbg_new
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(void *provctx, void *parent, const OSSL_DISPATCH *parent_dispatch,
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int (*dnew)(PROV_DRBG *ctx),
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int (*instantiate)(PROV_DRBG *drbg,
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const unsigned char *entropy, size_t entropylen,
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const unsigned char *nonce, size_t noncelen,
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const unsigned char *pers, size_t perslen),
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int (*uninstantiate)(PROV_DRBG *ctx),
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int (*reseed)(PROV_DRBG *drbg, const unsigned char *ent, size_t ent_len,
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const unsigned char *adin, size_t adin_len),
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int (*generate)(PROV_DRBG *, unsigned char *out, size_t outlen,
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const unsigned char *adin, size_t adin_len));
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void ossl_rand_drbg_free(PROV_DRBG *drbg);
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int ossl_prov_drbg_instantiate(PROV_DRBG *drbg, unsigned int strength,
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int prediction_resistance,
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const unsigned char *pers, size_t perslen);
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int ossl_prov_drbg_uninstantiate(PROV_DRBG *drbg);
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int ossl_prov_drbg_reseed(PROV_DRBG *drbg, int prediction_resistance,
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const unsigned char *ent, size_t ent_len,
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const unsigned char *adin, size_t adinlen);
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int ossl_prov_drbg_generate(PROV_DRBG *drbg, unsigned char *out, size_t outlen,
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unsigned int strength, int prediction_resistance,
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const unsigned char *adin, size_t adinlen);
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/* Seeding api */
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OSSL_FUNC_rand_get_seed_fn ossl_drbg_get_seed;
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OSSL_FUNC_rand_clear_seed_fn ossl_drbg_clear_seed;
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/* Verify that an array of numeric values is all zero */
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#define PROV_DRBG_VERYIFY_ZEROIZATION(v) \
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{ \
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size_t i; \
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\
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for (i = 0; i < OSSL_NELEM(v); i++) \
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if ((v)[i] != 0) \
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return 0; \
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}
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/* locking api */
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OSSL_FUNC_rand_enable_locking_fn ossl_drbg_enable_locking;
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OSSL_FUNC_rand_lock_fn ossl_drbg_lock;
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OSSL_FUNC_rand_unlock_fn ossl_drbg_unlock;
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/* Common parameters for all of our DRBGs */
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int ossl_drbg_get_ctx_params(PROV_DRBG *drbg, OSSL_PARAM params[]);
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int ossl_drbg_set_ctx_params(PROV_DRBG *drbg, const OSSL_PARAM params[]);
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#define OSSL_PARAM_DRBG_SETTABLE_CTX_COMMON \
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OSSL_PARAM_uint(OSSL_DRBG_PARAM_RESEED_REQUESTS, NULL), \
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OSSL_PARAM_uint64(OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL, NULL)
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#define OSSL_PARAM_DRBG_GETTABLE_CTX_COMMON \
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OSSL_PARAM_int(OSSL_RAND_PARAM_STATE, NULL), \
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OSSL_PARAM_uint(OSSL_RAND_PARAM_STRENGTH, NULL), \
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OSSL_PARAM_size_t(OSSL_RAND_PARAM_MAX_REQUEST, NULL), \
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OSSL_PARAM_size_t(OSSL_DRBG_PARAM_MIN_ENTROPYLEN, NULL), \
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OSSL_PARAM_size_t(OSSL_DRBG_PARAM_MAX_ENTROPYLEN, NULL), \
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OSSL_PARAM_size_t(OSSL_DRBG_PARAM_MIN_NONCELEN, NULL), \
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OSSL_PARAM_size_t(OSSL_DRBG_PARAM_MAX_NONCELEN, NULL), \
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OSSL_PARAM_size_t(OSSL_DRBG_PARAM_MAX_PERSLEN, NULL), \
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OSSL_PARAM_size_t(OSSL_DRBG_PARAM_MAX_ADINLEN, NULL), \
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OSSL_PARAM_uint(OSSL_DRBG_PARAM_RESEED_COUNTER, NULL), \
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OSSL_PARAM_time_t(OSSL_DRBG_PARAM_RESEED_TIME, NULL), \
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OSSL_PARAM_uint(OSSL_DRBG_PARAM_RESEED_REQUESTS, NULL), \
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OSSL_PARAM_uint64(OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL, NULL)
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/* Continuous test "entropy" calls */
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size_t ossl_crngt_get_entropy(PROV_DRBG *drbg,
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unsigned char **pout,
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int entropy, size_t min_len, size_t max_len,
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int prediction_resistance);
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void ossl_crngt_cleanup_entropy(PROV_DRBG *drbg,
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unsigned char *out, size_t outlen);
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#endif
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