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/* Copyright (c) 2001, Matej Pfajfar.
* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2018, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file crypto_dh.h
*
* \brief Headers for crypto_dh.c
**/
#ifndef TOR_CRYPTO_DH_H
#define TOR_CRYPTO_DH_H
#include "common/util.h"
/** Length of our DH keys. */
#define DH_BYTES (1024/8)
typedef struct crypto_dh_t crypto_dh_t;
/* Key negotiation */
#define DH_TYPE_CIRCUIT 1
#define DH_TYPE_REND 2
#define DH_TYPE_TLS 3
void crypto_set_tls_dh_prime(void);
crypto_dh_t *crypto_dh_new(int dh_type);
crypto_dh_t *crypto_dh_dup(const crypto_dh_t *dh);
int crypto_dh_get_bytes(crypto_dh_t *dh);
int crypto_dh_generate_public(crypto_dh_t *dh);
int crypto_dh_get_public(crypto_dh_t *dh, char *pubkey_out,
size_t pubkey_out_len);
ssize_t crypto_dh_compute_secret(int severity, crypto_dh_t *dh,
const char *pubkey, size_t pubkey_len,
char *secret_out, size_t secret_out_len);
void crypto_dh_free_(crypto_dh_t *dh);
#define crypto_dh_free(dh) FREE_AND_NULL(crypto_dh_t, crypto_dh_free_, (dh))
/* Crypto DH free */
void crypto_dh_free_all(void);
/* Prototypes for private functions only used by tortls.c, crypto.c, and the
* unit tests. */
struct dh_st;
struct dh_st *crypto_dh_get_dh_(crypto_dh_t *dh);
#endif /* !defined(TOR_CRYPTO_DH_H) */
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