include/openssl/rand_drbg.h

   1 /*
   2  * Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #ifndef OPENSSL_RAND_DRBG_H
  11 # define OPENSSL_RAND_DRBG_H
  12 # pragma once
  13
  14 # include <openssl/macros.h>
  15 # ifndef OPENSSL_NO_DEPRECATED_3_0
  16 #  define HEADER_DRBG_RAND_H
  17 # endif
  18
  19 # include <time.h>
  20 # include <openssl/types.h>
  21 # include <openssl/obj_mac.h>
  22
  23 /*
  24  * RAND_DRBG  flags
  25  *
  26  * Note: if new flags are added, the constant `rand_drbg_used_flags`
  27  *       in drbg_lib.c needs to be updated accordingly.
  28  */
  29
  30 /* In CTR mode, disable derivation function ctr_df */
  31 # define RAND_DRBG_FLAG_CTR_NO_DF            0x1
  32 /*
  33  * This flag is only used when a digest NID is specified (i.e: not a CTR cipher)
  34  * Selects DRBG_HMAC if this is set otherwise use DRBG_HASH.
  35  */
  36 # define RAND_DRBG_FLAG_HMAC                 0x2
  37
  38 /* Used by RAND_DRBG_set_defaults() to set the master DRBG type and flags. */
  39 # define RAND_DRBG_FLAG_MASTER               0x4
  40 /* Used by RAND_DRBG_set_defaults() to set the public DRBG type and flags. */
  41 # define RAND_DRBG_FLAG_PUBLIC               0x8
  42 /* Used by RAND_DRBG_set_defaults() to set the private DRBG type and flags. */
  43 # define RAND_DRBG_FLAG_PRIVATE              0x10
  44
  45 # ifndef OPENSSL_NO_DEPRECATED_3_0
  46 /* This #define was replaced by an internal constant and should not be used. */
  47 #  define RAND_DRBG_USED_FLAGS  (RAND_DRBG_FLAG_CTR_NO_DF)
  48 # endif
  49
  50 /*
  51  * Default security strength (in the sense of [NIST SP 800-90Ar1])
  52  *
  53  * NIST SP 800-90Ar1 supports the strength of the DRBG being smaller than that
  54  * of the cipher by collecting less entropy. The current DRBG implementation
  55  * does not take RAND_DRBG_STRENGTH into account and sets the strength of the
  56  * DRBG to that of the cipher.
  57  *
  58  * RAND_DRBG_STRENGTH is currently only used for the legacy RAND
  59  * implementation.
  60  *
  61  * Currently supported ciphers are: NID_aes_128_ctr, NID_aes_192_ctr and
  62  * NID_aes_256_ctr.
  63  * The digest types for DRBG_hash or DRBG_hmac are: NID_sha1, NID_sha224,
  64  * NID_sha256, NID_sha384, NID_sha512, NID_sha512_224, NID_sha512_256,
  65  * NID_sha3_224, NID_sha3_256, NID_sha3_384 and NID_sha3_512.
  66  */
  67 # define RAND_DRBG_STRENGTH             256
  68 /* Default drbg type */
  69 # define RAND_DRBG_TYPE                 NID_aes_256_ctr
  70 /* Default drbg flags */
  71 # define RAND_DRBG_FLAGS                0
  72
  73
  74 # ifdef  __cplusplus
  75 extern "C" {
  76 # endif
  77
  78 /*
  79  * Object lifetime functions.
  80  */
  81 RAND_DRBG *RAND_DRBG_new_ex(OPENSSL_CTX *ctx, int type, unsigned int flags,
  82                             RAND_DRBG *parent);
  83 RAND_DRBG *RAND_DRBG_secure_new_ex(OPENSSL_CTX *ctx, int type,
  84                                    unsigned int flags, RAND_DRBG *parent);
  85 RAND_DRBG *RAND_DRBG_new(int type, unsigned int flags, RAND_DRBG *parent);
  86 RAND_DRBG *RAND_DRBG_secure_new(int type, unsigned int flags, RAND_DRBG *parent);
  87 int RAND_DRBG_set(RAND_DRBG *drbg, int type, unsigned int flags);
  88 int RAND_DRBG_set_defaults(int type, unsigned int flags);
  89 int RAND_DRBG_instantiate(RAND_DRBG *drbg,
  90                           const unsigned char *pers, size_t perslen);
  91 int RAND_DRBG_uninstantiate(RAND_DRBG *drbg);
  92 void RAND_DRBG_free(RAND_DRBG *drbg);
  93
  94 /*
  95  * Object "use" functions.
  96  */
  97 int RAND_DRBG_reseed(RAND_DRBG *drbg,
  98                      const unsigned char *adin, size_t adinlen,
  99                      int prediction_resistance);
 100 int RAND_DRBG_generate(RAND_DRBG *drbg, unsigned char *out, size_t outlen,
 101                        int prediction_resistance,
 102                        const unsigned char *adin, size_t adinlen);
 103 int RAND_DRBG_bytes(RAND_DRBG *drbg, unsigned char *out, size_t outlen);
 104
 105 int RAND_DRBG_set_reseed_interval(RAND_DRBG *drbg, unsigned int interval);
 106 int RAND_DRBG_set_reseed_time_interval(RAND_DRBG *drbg, time_t interval);
 107
 108 int RAND_DRBG_set_reseed_defaults(
 109                                   unsigned int master_reseed_interval,
 110                                   unsigned int slave_reseed_interval,
 111                                   time_t master_reseed_time_interval,
 112                                   time_t slave_reseed_time_interval
 113                                   );
 114
 115 RAND_DRBG *OPENSSL_CTX_get0_master_drbg(OPENSSL_CTX *ctx);
 116 RAND_DRBG *OPENSSL_CTX_get0_public_drbg(OPENSSL_CTX *ctx);
 117 RAND_DRBG *OPENSSL_CTX_get0_private_drbg(OPENSSL_CTX *ctx);
 118 RAND_DRBG *RAND_DRBG_get0_master(void);
 119 RAND_DRBG *RAND_DRBG_get0_public(void);
 120 RAND_DRBG *RAND_DRBG_get0_private(void);
 121
 122 /*
 123  * EXDATA
 124  */
 125 # define RAND_DRBG_get_ex_new_index(l, p, newf, dupf, freef) \
 126     CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_RAND_DRBG, l, p, newf, dupf, freef)
 127 int RAND_DRBG_set_ex_data(RAND_DRBG *drbg, int idx, void *arg);
 128 void *RAND_DRBG_get_ex_data(const RAND_DRBG *drbg, int idx);
 129
 130 /*
 131  * Callback function typedefs
 132  */
 133 typedef size_t (*RAND_DRBG_get_entropy_fn)(RAND_DRBG *drbg,
 134                                            unsigned char **pout,
 135                                            int entropy, size_t min_len,
 136                                            size_t max_len,
 137                                            int prediction_resistance);
 138 typedef void (*RAND_DRBG_cleanup_entropy_fn)(RAND_DRBG *ctx,
 139                                              unsigned char *out, size_t outlen);
 140 typedef size_t (*RAND_DRBG_get_nonce_fn)(RAND_DRBG *drbg, unsigned char **pout,
 141                                          int entropy, size_t min_len,
 142                                          size_t max_len);
 143 typedef void (*RAND_DRBG_cleanup_nonce_fn)(RAND_DRBG *drbg,
 144                                            unsigned char *out, size_t outlen);
 145
 146 int RAND_DRBG_set_callbacks(RAND_DRBG *drbg,
 147                             RAND_DRBG_get_entropy_fn get_entropy,
 148                             RAND_DRBG_cleanup_entropy_fn cleanup_entropy,
 149                             RAND_DRBG_get_nonce_fn get_nonce,
 150                             RAND_DRBG_cleanup_nonce_fn cleanup_nonce);
 151
 152
 153 # ifdef  __cplusplus
 154 }
 155 # endif
 156
 157 #endif