tor/src/common/crypto_curve25519.h

/* Copyright (c) 2012, The Tor Project, Inc. */
/* See LICENSE for licensing information */

#ifndef TOR_CRYPTO_CURVE25519_H
#define TOR_CRYPTO_CURVE25519_H

#include "torint.h"

/** Length of a curve25519 public key when encoded. */
#define CURVE25519_PUBKEY_LEN 32
/** Length of a curve25519 secret key when encoded. */
#define CURVE25519_SECKEY_LEN 32
/** Length of the result of a curve25519 handshake. */
#define CURVE25519_OUTPUT_LEN 32

/** Wrapper type for a curve25519 public key */
typedef struct curve25519_public_key_t {
  uint8_t public_key[CURVE25519_PUBKEY_LEN];
} curve25519_public_key_t;

/** Wrapper type for a curve25519 secret key */
typedef struct curve25519_secret_key_t {
  uint8_t secret_key[CURVE25519_SECKEY_LEN];
} curve25519_secret_key_t;

int curve25519_public_key_is_ok(const curve25519_public_key_t *);

void 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);

void curve25519_handshake(uint8_t *output,
                          const curve25519_secret_key_t *,
                          const curve25519_public_key_t *);

#ifdef CRYPTO_CURVE25519_PRIVATE
int curve25519_impl(uint8_t *output, const uint8_t *secret,
                    const uint8_t *basepoint);
#endif

#endif