/*
 * Copyright (C) 2004, 2005, 2007, 2008, 2009, 2010 Free Software
 * Foundation, Inc.
 * Copyright (c) 2002 Andrew McDonald <andrew@mcdonald.org.uk>
 *
 * This file is part of GnuTLS-EXTRA.
 *
 * GnuTLS-extra is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 3 of the
 * License, or (at your option) any later version.
 *
 * GnuTLS-extra is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GnuTLS-EXTRA; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 */

/* WARNING: Error functions aren't currently thread-safe */

/* This file contains prototypes about the OpenSSL compatibility layer
 * in GnuTLS.  GnuTLS is not a complete replacement of OPENSSL so this
 * compatibility layer only support limited OpenSSL functionality.
 *
 * New programs should avoid using this compatibility layer, and use
 * the native GnuTLS API directly.
 */

#ifndef GNUTLS_OPENSSL_H
#define GNUTLS_OPENSSL_H

#ifdef __cplusplus
extern "C"
{
#endif

#include <gnutls/gnutls.h>

/* Extra definitions that do not longer exist in gnutls.
 */
#define GNUTLS_X509_CN_SIZE 256
#define GNUTLS_X509_C_SIZE 3
#define GNUTLS_X509_O_SIZE 256
#define GNUTLS_X509_OU_SIZE 256
#define GNUTLS_X509_L_SIZE 256
#define GNUTLS_X509_S_SIZE 256
#define GNUTLS_X509_EMAIL_SIZE 256

  typedef struct
  {
    char common_name[GNUTLS_X509_CN_SIZE];
    char country[GNUTLS_X509_C_SIZE];
    char organization[GNUTLS_X509_O_SIZE];
    char organizational_unit_name[GNUTLS_X509_OU_SIZE];
    char locality_name[GNUTLS_X509_L_SIZE];
    char state_or_province_name[GNUTLS_X509_S_SIZE];
    char email[GNUTLS_X509_EMAIL_SIZE];
  } gnutls_x509_dn;


#define OPENSSL_VERSION_NUMBER (0x0090604F)
#define SSLEAY_VERSION_NUMBER OPENSSL_VERSION_NUMBER
#define OPENSSL_VERSION_TEXT ("GNUTLS " GNUTLS_VERSION " ")

#define SSL_ERROR_NONE        (0)
#define SSL_ERROR_SSL         (1)
#define SSL_ERROR_WANT_READ   (2)
#define SSL_ERROR_WANT_WRITE  (3)
#define SSL_ERROR_SYSCALL     (5)
#define SSL_ERROR_ZERO_RETURN (6)

#define SSL_FILETYPE_PEM (GNUTLS_X509_FMT_PEM)

#define SSL_VERIFY_NONE (0)

#define SSL_ST_OK (1)

#define X509_V_ERR_CERT_NOT_YET_VALID          (1)
#define X509_V_ERR_CERT_HAS_EXPIRED            (2)
#define X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT (3)

#define SSL_OP_ALL (0x000FFFFF)
#define SSL_OP_NO_TLSv1 (0x0400000)

#define SSL_MODE_ENABLE_PARTIAL_WRITE (0x1)
#define SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER (0x2)
#define SSL_MODE_AUTO_RETRY (0x4)

  typedef gnutls_x509_dn X509_NAME;
  typedef gnutls_datum_t X509;

  typedef struct _SSL SSL;

  typedef struct
  {
    char priority_string[256];
    unsigned int connend;
  } SSL_METHOD;

  typedef struct
  {
    gnutls_protocol_t version;
    gnutls_cipher_algorithm_t cipher;
    gnutls_kx_algorithm_t kx;
    gnutls_mac_algorithm_t mac;
    gnutls_compression_method_t compression;
    gnutls_certificate_type_t cert;
  } SSL_CIPHER;

  typedef struct _BIO
  {
    gnutls_transport_ptr_t fd;
  } BIO;

  typedef struct
  {
    SSL *ssl;
    int error;
    const gnutls_datum_t *cert_list;
#define current_cert cert_list
  } X509_STORE_CTX;

#define X509_STORE_CTX_get_current_cert(ctx) ((ctx)->current_cert)

  typedef struct _SSL_CTX
  {
    SSL_METHOD *method;
    char *certfile;
    int certfile_type;
    char *keyfile;
    int keyfile_type;
    unsigned long options;

    int (*verify_callback) (int, X509_STORE_CTX *);
    int verify_mode;

  } SSL_CTX;

  struct _SSL
  {
    gnutls_session_t gnutls_state;

    gnutls_certificate_client_credentials gnutls_cred;

    SSL_CTX *ctx;
    SSL_CIPHER ciphersuite;

    int last_error;
    int shutdown;
    int state;
    unsigned long options;

    int (*verify_callback) (int, X509_STORE_CTX *);
    int verify_mode;

    gnutls_transport_ptr_t rfd;
    gnutls_transport_ptr_t wfd;
  };

#define rbio gnutls_state

  typedef struct
  {
    void *handle;
  } MD_CTX;

  struct rsa_st;
  typedef struct rsa_st RSA;

#define MD5_CTX MD_CTX
#define RIPEMD160_CTX MD_CTX

#define OpenSSL_add_ssl_algorithms()  SSL_library_init()
#define SSLeay_add_ssl_algorithms()   SSL_library_init()
#define SSLeay_add_all_algorithms()   OpenSSL_add_all_algorithms()

#define SSL_get_cipher_name(ssl) SSL_CIPHER_get_name(SSL_get_current_cipher(ssl))
#define SSL_get_cipher(ssl) SSL_get_cipher_name(ssl)
#define SSL_get_cipher_bits(ssl,bp) SSL_CIPHER_get_bits(SSL_get_current_cipher(ssl),(bp))
#define SSL_get_cipher_version(ssl) SSL_CIPHER_get_version(SSL_get_current_cipher(ssl))


/* Library initialisation functions */

  int SSL_library_init (void);
  void OpenSSL_add_all_algorithms (void);


/* SSL_CTX structure handling */

  SSL_CTX *SSL_CTX_new (SSL_METHOD * method);
  void SSL_CTX_free (SSL_CTX * ctx);
  int SSL_CTX_set_default_verify_paths (SSL_CTX * ctx);
  int SSL_CTX_use_certificate_file (SSL_CTX * ctx, const char *certfile,
                                    int type);
  int SSL_CTX_use_PrivateKey_file (SSL_CTX * ctx, const char *keyfile,
                                   int type);
  void SSL_CTX_set_verify (SSL_CTX * ctx, int verify_mode,
                           int (*verify_callback) (int, X509_STORE_CTX *));
  unsigned long SSL_CTX_set_options (SSL_CTX * ctx, unsigned long options);
  long SSL_CTX_set_mode (SSL_CTX * ctx, long mode);
  int SSL_CTX_set_cipher_list (SSL_CTX * ctx, const char *list);


/* SSL_CTX statistics */

  long SSL_CTX_sess_number (SSL_CTX * ctx);
  long SSL_CTX_sess_connect (SSL_CTX * ctx);
  long SSL_CTX_sess_connect_good (SSL_CTX * ctx);
  long SSL_CTX_sess_connect_renegotiate (SSL_CTX * ctx);
  long SSL_CTX_sess_accept (SSL_CTX * ctx);
  long SSL_CTX_sess_accept_good (SSL_CTX * ctx);
  long SSL_CTX_sess_accept_renegotiate (SSL_CTX * ctx);
  long SSL_CTX_sess_hits (SSL_CTX * ctx);
  long SSL_CTX_sess_misses (SSL_CTX * ctx);
  long SSL_CTX_sess_timeouts (SSL_CTX * ctx);


/* SSL structure handling */

  SSL *SSL_new (SSL_CTX * ctx);
  void SSL_free (SSL * ssl);
  void SSL_load_error_strings (void);
  int SSL_get_error (SSL * ssl, int ret);
  int SSL_set_fd (SSL * ssl, int fd);
  int SSL_set_rfd (SSL * ssl, int fd);
  int SSL_set_wfd (SSL * ssl, int fd);
  void SSL_set_bio (SSL * ssl, BIO * rbio, BIO * wbio);
  void SSL_set_connect_state (SSL * ssl);
  int SSL_pending (SSL * ssl);
  void SSL_set_verify (SSL * ssl, int verify_mode,
                       int (*verify_callback) (int, X509_STORE_CTX *));
  const X509 *SSL_get_peer_certificate (SSL * ssl);

/* SSL connection open/close/read/write functions */

  int SSL_connect (SSL * ssl);
  int SSL_accept (SSL * ssl);
  int SSL_shutdown (SSL * ssl);
  int SSL_read (SSL * ssl, void *buf, int len);
  int SSL_write (SSL * ssl, const void *buf, int len);

  int SSL_want (SSL * ssl);

#define SSL_NOTHING (1)
#define SSL_WRITING (2)
#define SSL_READING (3)
#define SSL_X509_LOOKUP (4)

#define SSL_want_nothing(s) (SSL_want(s) == SSL_NOTHING)
#define SSL_want_read(s) (SSL_want(s) == SSL_READING)
#define SSL_want_write(s) (SSL_want(s) == SSL_WRITING)
#define SSL_want_x509_lookup(s) (SSL_want(s) == SSL_X509_LOOKUP)


/* SSL_METHOD functions */

  SSL_METHOD *SSLv23_client_method (void);
  SSL_METHOD *SSLv23_server_method (void);
  SSL_METHOD *SSLv3_client_method (void);
  SSL_METHOD *SSLv3_server_method (void);
  SSL_METHOD *TLSv1_client_method (void);
  SSL_METHOD *TLSv1_server_method (void);


/* SSL_CIPHER functions */

  SSL_CIPHER *SSL_get_current_cipher (SSL * ssl);
  const char *SSL_CIPHER_get_name (SSL_CIPHER * cipher);
  int SSL_CIPHER_get_bits (SSL_CIPHER * cipher, int *bits);
  const char *SSL_CIPHER_get_version (SSL_CIPHER * cipher);
  char *SSL_CIPHER_description (SSL_CIPHER * cipher, char *buf, int size);


/* X509 functions */

  X509_NAME *X509_get_subject_name (const X509 * cert);
  X509_NAME *X509_get_issuer_name (const X509 * cert);
  char *X509_NAME_oneline (gnutls_x509_dn * name, char *buf, int len);
  void X509_free (const X509 * cert);


/* BIO functions */

  void BIO_get_fd (gnutls_session_t gnutls_state, int *fd);
  BIO *BIO_new_socket (int sock, int close_flag);

/* error handling */

  unsigned long ERR_get_error (void);
  const char *ERR_error_string (unsigned long e, char *buf);


/* RAND functions */

  int RAND_status (void);
  void RAND_seed (const void *buf, int num);
  int RAND_bytes (unsigned char *buf, int num);
  int RAND_pseudo_bytes (unsigned char *buf, int num);
  const char *RAND_file_name (char *buf, size_t len);
  int RAND_load_file (const char *name, long maxbytes);
  int RAND_write_file (const char *name);

  int RAND_egd_bytes (const char *path, int bytes);
#define RAND_egd(p) RAND_egd_bytes((p), 255)

/* message digest functions */

#define MD5_DIGEST_LENGTH 16

  void MD5_Init (MD5_CTX * ctx);
  void MD5_Update (MD5_CTX * ctx, const void *buf, int len);
  void MD5_Final (unsigned char *md, MD5_CTX * ctx);
  unsigned char *MD5 (const unsigned char *buf, unsigned long len,
                      unsigned char *md);

  void RIPEMD160_Init (RIPEMD160_CTX * ctx);
  void RIPEMD160_Update (RIPEMD160_CTX * ctx, const void *buf, int len);
  void RIPEMD160_Final (unsigned char *md, RIPEMD160_CTX * ctx);
  unsigned char *RIPEMD160 (const unsigned char *buf, unsigned long len,
                            unsigned char *md);

#ifdef __cplusplus
}
#endif
#endif
