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/*
* Copyright 1995-2018 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
*/
#ifndef HEADER_RAND_LCL_H
# define HEADER_RAND_LCL_H
# include <openssl/aes.h>
# include <openssl/evp.h>
# include <openssl/sha.h>
# include <openssl/hmac.h>
# include <openssl/ec.h>
# include <openssl/rand_drbg.h>
/* How many times to read the TSC as a randomness source. */
# define TSC_READ_COUNT 4
/* Maximum reseed intervals */
# define MAX_RESEED_INTERVAL (1 << 24)
# define MAX_RESEED_TIME_INTERVAL (1 << 20) /* approx. 12 days */
/* Default reseed intervals */
# define MASTER_RESEED_INTERVAL (1 << 8)
# define SLAVE_RESEED_INTERVAL (1 << 16)
# define MASTER_RESEED_TIME_INTERVAL (60*60) /* 1 hour */
# define SLAVE_RESEED_TIME_INTERVAL (7*60) /* 7 minutes */
/* Max size of additional input and personalization string. */
# define DRBG_MAX_LENGTH 4096
/*
* The quotient between max_{entropy,nonce}len and min_{entropy,nonce}len
*
* The current factor is large enough that the RAND_POOL can store a
* random input which has a lousy entropy rate of 0.0625 bits per byte.
* This input will be sent through the derivation function which 'compresses'
* the low quality input into a high quality output.
*/
# define DRBG_MINMAX_FACTOR 128
/* DRBG status values */
typedef enum drbg_status_e {
DRBG_UNINITIALISED,
DRBG_READY,
DRBG_ERROR
} DRBG_STATUS;
/* instantiate */
typedef int (*RAND_DRBG_instantiate_fn)(RAND_DRBG *ctx,
const unsigned char *ent,
size_t entlen,
const unsigned char *nonce,
size_t noncelen,
const unsigned char *pers,
size_t perslen);
/* reseed */
typedef int (*RAND_DRBG_reseed_fn)(RAND_DRBG *ctx,
const unsigned char *ent,
size_t entlen,
const unsigned char *adin,
size_t adinlen);
/* generate output */
typedef int (*RAND_DRBG_generate_fn)(RAND_DRBG *ctx,
unsigned char *out,
size_t outlen,
const unsigned char *adin,
size_t adinlen);
/* uninstantiate */
typedef int (*RAND_DRBG_uninstantiate_fn)(RAND_DRBG *ctx);
/*
* The DRBG methods
*/
typedef struct rand_drbg_method_st {
RAND_DRBG_instantiate_fn instantiate;
RAND_DRBG_reseed_fn reseed;
RAND_DRBG_generate_fn generate;
RAND_DRBG_uninstantiate_fn uninstantiate;
} RAND_DRBG_METHOD;
/* 888 bits from SP800-90Ar1 10.1 table 2 */
#define HASH_PRNG_MAX_SEEDLEN (888/8)
typedef struct rand_drbg_hash_st {
const EVP_MD *md;
EVP_MD_CTX *ctx;
size_t blocklen;
unsigned char V[HASH_PRNG_MAX_SEEDLEN];
unsigned char C[HASH_PRNG_MAX_SEEDLEN];
/* Temporary value storage: should always exceed max digest length */
unsigned char vtmp[HASH_PRNG_MAX_SEEDLEN];
} RAND_DRBG_HASH;
typedef struct rand_drbg_hmac_st {
const EVP_MD *md;
HMAC_CTX *ctx;
size_t blocklen;
unsigned char K[EVP_MAX_MD_SIZE];
unsigned char V[EVP_MAX_MD_SIZE];
} RAND_DRBG_HMAC;
/*
* The state of a DRBG AES-CTR.
*/
typedef struct rand_drbg_ctr_st {
EVP_CIPHER_CTX *ctx;
EVP_CIPHER_CTX *ctx_df;
const EVP_CIPHER *cipher;
size_t keylen;
unsigned char K[32];
unsigned char V[16];
/* Temporary block storage used by ctr_df */
unsigned char bltmp[16];
size_t bltmp_pos;
unsigned char KX[48];
} RAND_DRBG_CTR;
/*
* The 'random pool' acts as a dumb container for collecting random
* input from various entropy sources. The pool has no knowledge about
* whether its randomness is fed into a legacy RAND_METHOD via RAND_add()
* or into a new style RAND_DRBG. It is the callers duty to 1) initialize the
* random pool, 2) pass it to the polling callbacks, 3) seed the RNG, and
* 4) cleanup the random pool again.
*
* The random pool contains no locking mechanism because its scope and
* lifetime is intended to be restricted to a single stack frame.
*/
struct rand_pool_st {
unsigned char *buffer; /* points to the beginning of the random pool */
size_t len; /* current number of random bytes contained in the pool */
size_t min_len; /* minimum number of random bytes requested */
size_t max_len; /* maximum number of random bytes (allocated buffer size) */
size_t entropy; /* current entropy count in bits */
size_t requested_entropy; /* requested entropy count in bits */
};
/*
* The state of all types of DRBGs, even though we only have CTR mode
* right now.
*/
struct rand_drbg_st {
CRYPTO_RWLOCK *lock;
RAND_DRBG *parent;
int secure; /* 1: allocated on the secure heap, 0: otherwise */
int type; /* the nid of the underlying algorithm */
/*
* Stores the value of the rand_fork_count global as of when we last
* reseeded. The DRBG reseeds automatically whenever drbg->fork_count !=
* rand_fork_count. Used to provide fork-safety and reseed this DRBG in
* the child process.
*/
int fork_count;
unsigned short flags; /* various external flags */
/*
* The random pool is used by RAND_add()/drbg_add() to attach random
* data to the global drbg, such that the rand_drbg_get_entropy() callback
* can pull it during instantiation and reseeding. This is necessary to
* reconcile the different philosophies of the RAND and the RAND_DRBG
* with respect to how randomness is added to the RNG during reseeding
* (see PR #4328).
*/
struct rand_pool_st *pool;
/*
* The following parameters are setup by the per-type "init" function.
*
* The supported types and their init functions are:
* (1) CTR_DRBG: drbg_ctr_init().
* (2) HMAC_DRBG: drbg_hmac_init().
* (3) HASH_DRBG: drbg_hash_init().
*
* The parameters are closely related to the ones described in
* section '10.2.1 CTR_DRBG' of [NIST SP 800-90Ar1], with one
* crucial difference: In the NIST standard, all counts are given
* in bits, whereas in OpenSSL entropy counts are given in bits
* and buffer lengths are given in bytes.
*
* Since this difference has lead to some confusion in the past,
* (see [GitHub Issue #2443], formerly [rt.openssl.org #4055])
* the 'len' suffix has been added to all buffer sizes for
* clarification.
*/
int strength;
size_t max_request;
size_t min_entropylen, max_entropylen;
size_t min_noncelen, max_noncelen;
size_t max_perslen, max_adinlen;
/*
* Counts the number of generate requests since the last reseed
* (Starts at 1). This value is the reseed_counter as defined in
* NIST SP 800-90Ar1
*/
unsigned int reseed_gen_counter;
/*
* Maximum number of generate requests until a reseed is required.
* This value is ignored if it is zero.
*/
unsigned int reseed_interval;
/* Stores the time when the last reseeding occurred */
time_t reseed_time;
/*
* Specifies the maximum time interval (in seconds) between reseeds.
* This value is ignored if it is zero.
*/
time_t reseed_time_interval;
/*
* Counts the number of reseeds since instantiation.
* This value is ignored if it is zero.
*
* This counter is used only for seed propagation from the <master> DRBG
* to its two children, the <public> and <private> DRBG. This feature is
* very special and its sole purpose is to ensure that any randomness which
* is added by RAND_add() or RAND_seed() will have an immediate effect on
* the output of RAND_bytes() resp. RAND_priv_bytes().
*/
unsigned int reseed_prop_counter;
size_t seedlen;
DRBG_STATUS state;
/* Application data, mainly used in the KATs. */
CRYPTO_EX_DATA ex_data;
/* Implementation specific data */
union {
RAND_DRBG_CTR ctr;
RAND_DRBG_HASH hash;
RAND_DRBG_HMAC hmac;
} data;
/* Implementation specific methods */
RAND_DRBG_METHOD *meth;
/* Callback functions. See comments in rand_lib.c */
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;
};
/* The global RAND method, and the global buffer and DRBG instance. */
extern RAND_METHOD rand_meth;
/*
* A "generation count" of forks. Incremented in the child process after a
* fork. Since rand_fork_count is increment-only, and only ever written to in
* the child process of the fork, which is guaranteed to be single-threaded, no
* locking is needed for normal (read) accesses; the rest of pthread fork
* processing is assumed to introduce the necessary memory barriers. Sibling
* children of a given parent will produce duplicate values, but this is not
* problematic because the reseeding process pulls input from the system CSPRNG
* and/or other global sources, so the siblings will end up generating
* different output streams.
*/
extern int rand_fork_count;
/* DRBG helpers */
int rand_drbg_restart(RAND_DRBG *drbg,
const unsigned char *buffer, size_t len, size_t entropy);
/* locking api */
int rand_drbg_lock(RAND_DRBG *drbg);
int rand_drbg_unlock(RAND_DRBG *drbg);
int rand_drbg_enable_locking(RAND_DRBG *drbg);
/* initializes the DRBG implementation */
int drbg_ctr_init(RAND_DRBG *drbg);
int drbg_hash_init(RAND_DRBG *drbg);
int drbg_hmac_init(RAND_DRBG *drbg);
#endif
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