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/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single TCP/UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2002-2017 OpenVPN Technologies, Inc. <sales@openvpn.net>
* Copyright (C) 2010-2017 Fox Crypto B.V. <openvpn@fox-it.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/**
* @file Data Channel Cryptography OpenSSL-specific backend interface
*/
#ifndef CRYPTO_OPENSSL_H_
#define CRYPTO_OPENSSL_H_
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <openssl/md5.h>
#include <openssl/sha.h>
/** Generic cipher key type %context. */
typedef EVP_CIPHER cipher_kt_t;
/** Generic message digest key type %context. */
typedef EVP_MD md_kt_t;
/** Generic cipher %context. */
typedef EVP_CIPHER_CTX cipher_ctx_t;
/** Generic message digest %context. */
typedef EVP_MD_CTX md_ctx_t;
/** Generic HMAC %context. */
typedef HMAC_CTX hmac_ctx_t;
/** Maximum length of an IV */
#define OPENVPN_MAX_IV_LENGTH EVP_MAX_IV_LENGTH
/** Cipher is in CBC mode */
#define OPENVPN_MODE_CBC EVP_CIPH_CBC_MODE
/** Cipher is in OFB mode */
#define OPENVPN_MODE_OFB EVP_CIPH_OFB_MODE
/** Cipher is in CFB mode */
#define OPENVPN_MODE_CFB EVP_CIPH_CFB_MODE
#ifdef HAVE_AEAD_CIPHER_MODES
/** Cipher is in GCM mode */
#define OPENVPN_MODE_GCM EVP_CIPH_GCM_MODE
#endif /* HAVE_AEAD_CIPHER_MODES */
/** Cipher should encrypt */
#define OPENVPN_OP_ENCRYPT 1
/** Cipher should decrypt */
#define OPENVPN_OP_DECRYPT 0
#define DES_KEY_LENGTH 8
#define MD4_DIGEST_LENGTH 16
/**
* Retrieve any occurred OpenSSL errors and print those errors.
*
* Note that this function uses the not thread-safe OpenSSL error API.
*
* @param flags Flags to indicate error type and priority.
*/
void crypto_print_openssl_errors(const unsigned int flags);
/**
* Retrieve any OpenSSL errors, then print the supplied error message.
*
* This is just a convenience wrapper for often occurring situations.
*
* @param flags Flags to indicate error type and priority.
* @param format Format string to print.
* @param format args (optional) arguments for the format string.
*/
#define crypto_msg(flags, ...) \
do { \
crypto_print_openssl_errors(nonfatal(flags)); \
msg((flags), __VA_ARGS__); \
} while (false)
#endif /* CRYPTO_OPENSSL_H_ */
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