crypto/dh/dh_local.h

   1 /*
   2  * Copyright 2016 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
  13 #define DH_MIN_MODULUS_BITS     512
  14
  15 struct dh_st {
  16     /*
  17      * This first argument is used to pick up errors when a DH is passed
  18      * instead of a EVP_PKEY
  19      */
  20     int pad;
  21     int version;
  22     BIGNUM *p;
  23     BIGNUM *g;
  24     int32_t length;             /* optional */
  25     BIGNUM *pub_key;            /* g^x % p */
  26     BIGNUM *priv_key;           /* x */
  27     int flags;
  28     BN_MONT_CTX *method_mont_p;
  29     /* Place holders if we want to do X9.42 DH */
  30     BIGNUM *q;
  31     BIGNUM *j;
  32     unsigned char *seed;
  33     int seedlen;
  34     BIGNUM *counter;
  35     CRYPTO_REF_COUNT references;
  36     CRYPTO_EX_DATA ex_data;
  37     const DH_METHOD *meth;
  38     ENGINE *engine;
  39     CRYPTO_RWLOCK *lock;
  40
  41     /* Provider data */
  42     size_t dirty_cnt; /* If any key material changes, increment this */
  43 };
  44
  45 struct dh_method {
  46     char *name;
  47     /* Methods here */
  48     int (*generate_key) (DH *dh);
  49     int (*compute_key) (unsigned char *key, const BIGNUM *pub_key, DH *dh);
  50
  51     /* Can be null */
  52     int (*bn_mod_exp) (const DH *dh, BIGNUM *r, const BIGNUM *a,
  53                        const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
  54                        BN_MONT_CTX *m_ctx);
  55     int (*init) (DH *dh);
  56     int (*finish) (DH *dh);
  57     int flags;
  58     char *app_data;
  59     /* If this is non-NULL, it will be used to generate parameters */
  60     int (*generate_params) (DH *dh, int prime_len, int generator,
  61                             BN_GENCB *cb);
  62 };
  63
  64 int dh_buf2key(DH *key, const unsigned char *buf, size_t len);
  65 size_t dh_key2buf(const DH *dh, unsigned char **pbuf);