2 * Copyright 2016-2020 The OpenSSL Project Authors. All Rights Reserved.
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
10 #include <openssl/dh.h>
11 #include "internal/refcount.h"
12 #include "internal/ffc.h"
14 #define DH_MIN_MODULUS_BITS 512
18 * This first argument is used to pick up errors when a DH is passed
19 * instead of a EVP_PKEY
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 */
28 BN_MONT_CTX *method_mont_p;
29 CRYPTO_REF_COUNT references;
31 CRYPTO_EX_DATA ex_data;
35 const DH_METHOD *meth;
39 size_t dirty_cnt; /* If any key material changes, increment this */
45 int (*generate_key) (DH *dh);
46 int (*compute_key) (unsigned char *key, const BIGNUM *pub_key, DH *dh);
49 int (*bn_mod_exp) (const DH *dh, BIGNUM *r, const BIGNUM *a,
50 const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
53 int (*finish) (DH *dh);
56 /* If this is non-NULL, it will be used to generate parameters */
57 int (*generate_params) (DH *dh, int prime_len, int generator,
61 int dh_buf2key(DH *key, const unsigned char *buf, size_t len);
62 size_t dh_key2buf(const DH *dh, unsigned char **pbuf);