include/openssl/rand_drbg.h

   1 /*
   2  * Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (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 HEADER_DRBG_RAND_H
  11 # define HEADER_DRBG_RAND_H
  12
  13 # include <time.h>
  14 # include <openssl/ossl_typ.h>
  15 # include <openssl/obj_mac.h>
  16
  17 /*
  18  * RAND_DRBG  flags
  19  *
  20  * Note: if new flags are added, the constant `rand_drbg_used_flags`
  21  *       in drbg_lib.c needs to be updated accordingly.
  22  */
  23
  24 /* In CTR mode, disable derivation function ctr_df */
  25 # define RAND_DRBG_FLAG_CTR_NO_DF            0x1
  26 /*
  27  * This flag is only used when a digest NID is specified (i.e: not a CTR cipher)
  28  * Selects DRBG_HMAC if this is set otherwise use DRBG_HASH.
  29  */
  30 # define RAND_DRBG_FLAG_HMAC                 0x2
  31
  32 /* Used by RAND_DRBG_set_defaults() to set the master DRBG type and flags. */
  33 # define RAND_DRBG_FLAG_MASTER               0x4
  34 /* Used by RAND_DRBG_set_defaults() to set the public DRBG type and flags. */
  35 # define RAND_DRBG_FLAG_PUBLIC               0x8
  36 /* Used by RAND_DRBG_set_defaults() to set the private DRBG type and flags. */
  37 # define RAND_DRBG_FLAG_PRIVATE              0x10
  38
  39 # if !OPENSSL_API_3
  40 /* This #define was replaced by an internal constant and should not be used. */
  41 #  define RAND_DRBG_USED_FLAGS  (RAND_DRBG_FLAG_CTR_NO_DF)
  42 # endif
  43
  44 /*
  45  * Default security strength (in the sense of [NIST SP 800-90Ar1])
  46  *
  47  * NIST SP 800-90Ar1 supports the strength of the DRBG being smaller than that
  48  * of the cipher by collecting less entropy. The current DRBG implementation
  49  * does not take RAND_DRBG_STRENGTH into account and sets the strength of the
  50  * DRBG to that of the cipher.
  51  *
  52  * RAND_DRBG_STRENGTH is currently only used for the legacy RAND
  53  * implementation.
  54  *
  55  * Currently supported ciphers are: NID_aes_128_ctr, NID_aes_192_ctr and
  56  * NID_aes_256_ctr.
  57  * The digest types for DRBG_hash or DRBG_hmac are: NID_sha1, NID_sha224,
  58  * NID_sha256, NID_sha384, NID_sha512, NID_sha512_224, NID_sha512_256,
  59  * NID_sha3_224, NID_sha3_256, NID_sha3_384 and NID_sha3_512.
  60  */
  61 # define RAND_DRBG_STRENGTH             256
  62 /* Default drbg type */
  63 # define RAND_DRBG_TYPE                 NID_aes_256_ctr
  64 /* Default drbg flags */
  65 # define RAND_DRBG_FLAGS                0
  66
  67
  68 # ifdef  __cplusplus
  69 extern "C" {
  70 # endif
  71
  72 /*
  73  * Object lifetime functions.
  74  */
  75 RAND_DRBG *RAND_DRBG_new(int type, unsigned int flags, RAND_DRBG *parent);
  76 RAND_DRBG *RAND_DRBG_secure_new(int type, unsigned int flags, RAND_DRBG *parent);
  77 int RAND_DRBG_set(RAND_DRBG *drbg, int type, unsigned int flags);
  78 int RAND_DRBG_set_defaults(int type, unsigned int flags);
  79 int RAND_DRBG_instantiate(RAND_DRBG *drbg,
  80                           const unsigned char *pers, size_t perslen);
  81 int RAND_DRBG_uninstantiate(RAND_DRBG *drbg);
  82 void RAND_DRBG_free(RAND_DRBG *drbg);
  83
  84 /*
  85  * Object "use" functions.
  86  */
  87 int RAND_DRBG_reseed(RAND_DRBG *drbg,
  88                      const unsigned char *adin, size_t adinlen,
  89                      int prediction_resistance);
  90 int RAND_DRBG_generate(RAND_DRBG *drbg, unsigned char *out, size_t outlen,
  91                        int prediction_resistance,
  92                        const unsigned char *adin, size_t adinlen);
  93 int RAND_DRBG_bytes(RAND_DRBG *drbg, unsigned char *out, size_t outlen);
  94
  95 int RAND_DRBG_set_reseed_interval(RAND_DRBG *drbg, unsigned int interval);
  96 int RAND_DRBG_set_reseed_time_interval(RAND_DRBG *drbg, time_t interval);
  97
  98 int RAND_DRBG_set_reseed_defaults(
  99                                   unsigned int master_reseed_interval,
 100                                   unsigned int slave_reseed_interval,
 101                                   time_t master_reseed_time_interval,
 102                                   time_t slave_reseed_time_interval
 103                                   );
 104
 105 RAND_DRBG *RAND_DRBG_get0_master(void);
 106 RAND_DRBG *RAND_DRBG_get0_public(void);
 107 RAND_DRBG *RAND_DRBG_get0_private(void);
 108
 109 /*
 110  * EXDATA
 111  */
 112 # define RAND_DRBG_get_ex_new_index(l, p, newf, dupf, freef) \
 113     CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DRBG, l, p, newf, dupf, freef)
 114 int RAND_DRBG_set_ex_data(RAND_DRBG *drbg, int idx, void *arg);
 115 void *RAND_DRBG_get_ex_data(const RAND_DRBG *drbg, int idx);
 116
 117 /*
 118  * Callback function typedefs
 119  */
 120 typedef size_t (*RAND_DRBG_get_entropy_fn)(RAND_DRBG *drbg,
 121                                            unsigned char **pout,
 122                                            int entropy, size_t min_len,
 123                                            size_t max_len,
 124                                            int prediction_resistance);
 125 typedef void (*RAND_DRBG_cleanup_entropy_fn)(RAND_DRBG *ctx,
 126                                              unsigned char *out, size_t outlen);
 127 typedef size_t (*RAND_DRBG_get_nonce_fn)(RAND_DRBG *drbg, unsigned char **pout,
 128                                          int entropy, size_t min_len,
 129                                          size_t max_len);
 130 typedef void (*RAND_DRBG_cleanup_nonce_fn)(RAND_DRBG *drbg,
 131                                            unsigned char *out, size_t outlen);
 132
 133 int RAND_DRBG_set_callbacks(RAND_DRBG *drbg,
 134                             RAND_DRBG_get_entropy_fn get_entropy,
 135                             RAND_DRBG_cleanup_entropy_fn cleanup_entropy,
 136                             RAND_DRBG_get_nonce_fn get_nonce,
 137                             RAND_DRBG_cleanup_nonce_fn cleanup_nonce);
 138
 139
 140 # ifdef  __cplusplus
 141 }
 142 # endif
 143
 144 #endif