src/lib/crypt_ops/crypto_dh.h

   1 /* Copyright (c) 2001, Matej Pfajfar.
   2  * Copyright (c) 2001-2004, Roger Dingledine.
   3  * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
   4  * Copyright (c) 2007-2021, The Tor Project, Inc. */
   5 /* See LICENSE for licensing information */
   6
   7 /**
   8  * \file crypto_dh.h
   9  *
  10  * \brief Headers for crypto_dh.c
  11  **/
  12
  13 #ifndef TOR_CRYPTO_DH_H
  14 #define TOR_CRYPTO_DH_H
  15
  16 #include "orconfig.h"
  17 #include "lib/cc/torint.h"
  18 #include "lib/defs/dh_sizes.h"
  19
  20 typedef struct crypto_dh_t crypto_dh_t;
  21
  22 extern const unsigned DH_GENERATOR;
  23 extern const char TLS_DH_PRIME[];
  24 extern const char OAKLEY_PRIME_2[];
  25
  26 /* Key negotiation */
  27 #define DH_TYPE_CIRCUIT 1
  28 #define DH_TYPE_REND 2
  29 #define DH_TYPE_TLS 3
  30 void crypto_dh_init(void);
  31 crypto_dh_t *crypto_dh_new(int dh_type);
  32 crypto_dh_t *crypto_dh_dup(const crypto_dh_t *dh);
  33 int crypto_dh_get_bytes(crypto_dh_t *dh);
  34 int crypto_dh_generate_public(crypto_dh_t *dh);
  35 int crypto_dh_get_public(crypto_dh_t *dh, char *pubkey_out,
  36                          size_t pubkey_out_len);
  37 ssize_t crypto_dh_compute_secret(int severity, crypto_dh_t *dh,
  38                              const char *pubkey, size_t pubkey_len,
  39                              char *secret_out, size_t secret_out_len);
  40 void crypto_dh_free_(crypto_dh_t *dh);
  41 #define crypto_dh_free(dh) FREE_AND_NULL(crypto_dh_t, crypto_dh_free_, (dh))
  42
  43 ssize_t crypto_dh_handshake(int severity, crypto_dh_t *dh,
  44                             const char *pubkey, size_t pubkey_len,
  45                             unsigned char *secret_out,
  46                             size_t secret_bytes_out);
  47
  48 void crypto_dh_free_all(void);
  49
  50 /* Prototypes for private functions only used by tortls.c, crypto.c, and the
  51  * unit tests. */
  52 struct dh_st;
  53 struct dh_st *crypto_dh_new_openssl_tls(void);
  54
  55 #ifdef ENABLE_OPENSSL
  56 void crypto_dh_init_openssl(void);
  57 void crypto_dh_free_all_openssl(void);
  58 #endif
  59 #ifdef ENABLE_NSS
  60 void crypto_dh_init_nss(void);
  61 void crypto_dh_free_all_nss(void);
  62 #endif
  63
  64 #endif /* !defined(TOR_CRYPTO_DH_H) */