crypto/dh/dh_local.h

   1 /*
   2  * Copyright 2016-2020 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 #include <openssl/dh.h>
  11 #include "internal/refcount.h"
  12 #include "internal/ffc.h"
  13
  14 #define DH_MIN_MODULUS_BITS     512
  15
  16 struct dh_st {
  17     /*
  18      * This first argument is used to pick up errors when a DH is passed
  19      * instead of a EVP_PKEY
  20      */
  21     int pad;
  22     int version;
  23     FFC_PARAMS params;
  24     int32_t length;             /* optional value of N (if there is no q) */
  25     BIGNUM *pub_key;            /* g^x % p */
  26     BIGNUM *priv_key;           /* x */
  27     int flags;
  28     BN_MONT_CTX *method_mont_p;
  29     CRYPTO_REF_COUNT references;
  30 #ifndef FIPS_MODE
  31     CRYPTO_EX_DATA ex_data;
  32     ENGINE *engine;
  33 #endif
  34     const DH_METHOD *meth;
  35     CRYPTO_RWLOCK *lock;
  36
  37     /* Provider data */
  38     size_t dirty_cnt; /* If any key material changes, increment this */
  39 };
  40
  41 struct dh_method {
  42     char *name;
  43     /* Methods here */
  44     int (*generate_key) (DH *dh);
  45     int (*compute_key) (unsigned char *key, const BIGNUM *pub_key, DH *dh);
  46
  47     /* Can be null */
  48     int (*bn_mod_exp) (const DH *dh, BIGNUM *r, const BIGNUM *a,
  49                        const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
  50                        BN_MONT_CTX *m_ctx);
  51     int (*init) (DH *dh);
  52     int (*finish) (DH *dh);
  53     int flags;
  54     char *app_data;
  55     /* If this is non-NULL, it will be used to generate parameters */
  56     int (*generate_params) (DH *dh, int prime_len, int generator,
  57                             BN_GENCB *cb);
  58 };
  59
  60 int dh_buf2key(DH *key, const unsigned char *buf, size_t len);
  61 size_t dh_key2buf(const DH *dh, unsigned char **pbuf);