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/* Copyright (c) 2012-2020, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file crypto_curve25519.h
* \brief Header for crypto_curve25519.c
**/
#ifndef TOR_CRYPTO_CURVE25519_H
#define TOR_CRYPTO_CURVE25519_H
#include "lib/testsupport/testsupport.h"
#include "lib/cc/torint.h"
#include "lib/crypt_ops/crypto_digest.h"
#include "lib/crypt_ops/crypto_openssl_mgt.h"
#include "lib/defs/x25519_sizes.h"
/** Wrapper type for a curve25519 public key.
*
* (We define a separate type for these to make it less likely that we'll
* mistake them for secret keys.)
* */
typedef struct curve25519_public_key_t {
uint8_t public_key[CURVE25519_PUBKEY_LEN];
} curve25519_public_key_t;
/** Wrapper type for a curve25519 secret key
*
* (We define a separate type for these to make it less likely that we'll
* mistake them for public keys.)
**/
typedef struct curve25519_secret_key_t {
uint8_t secret_key[CURVE25519_SECKEY_LEN];
} curve25519_secret_key_t;
/** A paired public and private key for curve25519. **/
typedef struct curve25519_keypair_t {
curve25519_public_key_t pubkey;
curve25519_secret_key_t seckey;
} curve25519_keypair_t;
/* These functions require that we actually know how to use curve25519 keys.
* The other data structures and functions in this header let us parse them,
* store them, and move them around.
*/
int curve25519_public_key_is_ok(const curve25519_public_key_t *);
int curve25519_secret_key_generate(curve25519_secret_key_t *key_out,
int extra_strong);
void curve25519_public_key_generate(curve25519_public_key_t *key_out,
const curve25519_secret_key_t *seckey);
int curve25519_keypair_generate(curve25519_keypair_t *keypair_out,
int extra_strong);
void curve25519_handshake(uint8_t *output,
const curve25519_secret_key_t *,
const curve25519_public_key_t *);
int curve25519_keypair_write_to_file(const curve25519_keypair_t *keypair,
const char *fname,
const char *tag);
int curve25519_keypair_read_from_file(curve25519_keypair_t *keypair_out,
char **tag_out,
const char *fname);
int curve25519_rand_seckey_bytes(uint8_t *out, int extra_strong);
#ifdef CRYPTO_CURVE25519_PRIVATE
STATIC int curve25519_impl(uint8_t *output, const uint8_t *secret,
const uint8_t *basepoint);
STATIC int curve25519_basepoint_impl(uint8_t *output, const uint8_t *secret);
#endif /* defined(CRYPTO_CURVE25519_PRIVATE) */
int curve25519_public_from_base64(curve25519_public_key_t *pkey,
const char *input);
void curve25519_public_to_base64(char *output,
const curve25519_public_key_t *pkey);
void curve25519_set_impl_params(int use_ed);
void curve25519_init(void);
#endif /* !defined(TOR_CRYPTO_CURVE25519_H) */
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