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/*
* Copyright 2016-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <openssl/dh.h>
#include "internal/refcount.h"
#include "internal/ffc.h"
#define DH_MIN_MODULUS_BITS 512
struct dh_st {
/*
* This first argument is used to pick up errors when a DH is passed
* instead of a EVP_PKEY
*/
int pad;
int version;
FFC_PARAMS params;
/* max generated private key length (can be less than len(q)) */
int32_t length;
BIGNUM *pub_key; /* g^x % p */
BIGNUM *priv_key; /* x */
int flags;
BN_MONT_CTX *method_mont_p;
CRYPTO_REF_COUNT references;
#ifndef FIPS_MODULE
CRYPTO_EX_DATA ex_data;
ENGINE *engine;
#endif
OSSL_LIB_CTX *libctx;
const DH_METHOD *meth;
CRYPTO_RWLOCK *lock;
/* Provider data */
size_t dirty_cnt; /* If any key material changes, increment this */
};
struct dh_method {
char *name;
/* Methods here */
int (*generate_key) (DH *dh);
int (*compute_key) (unsigned char *key, const BIGNUM *pub_key, DH *dh);
/* Can be null */
int (*bn_mod_exp) (const DH *dh, BIGNUM *r, const BIGNUM *a,
const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
BN_MONT_CTX *m_ctx);
int (*init) (DH *dh);
int (*finish) (DH *dh);
int flags;
char *app_data;
/* If this is non-NULL, it will be used to generate parameters */
int (*generate_params) (DH *dh, int prime_len, int generator,
BN_GENCB *cb);
};
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