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authorAlberto Gonzalez Iniesta <agi@inittab.org>2016-11-21 09:37:33 +0100
committerAlberto Gonzalez Iniesta <agi@inittab.org>2016-11-21 09:37:33 +0100
commit93b77cacdbb7e6f310c4e20f85c3a24ed5ba18ba (patch)
tree55a7688c9969ef4d01625caa58c7f679098c76eb /src/openvpn/crypto_mbedtls.h
parentdaa9ef0efeb5e10a1b43820fbab3a4ff5fbd22f1 (diff)
parent20c8675ba46bda97330a4117c459a59a9f1c465e (diff)
Merge tag 'upstream/2.4_beta1'
Upstream version 2.4~beta1
Diffstat (limited to 'src/openvpn/crypto_mbedtls.h')
-rw-r--r--src/openvpn/crypto_mbedtls.h146
1 files changed, 146 insertions, 0 deletions
diff --git a/src/openvpn/crypto_mbedtls.h b/src/openvpn/crypto_mbedtls.h
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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) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
+ * Copyright (C) 2010 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 (see the file COPYING included with this
+ * distribution); if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/**
+ * @file Data Channel Cryptography mbed TLS-specific backend interface
+ */
+
+#ifndef CRYPTO_MBEDTLS_H_
+#define CRYPTO_MBEDTLS_H_
+
+#include <mbedtls/cipher.h>
+#include <mbedtls/md.h>
+#include <mbedtls/ctr_drbg.h>
+
+/** Generic cipher key type %context. */
+typedef mbedtls_cipher_info_t cipher_kt_t;
+
+/** Generic message digest key type %context. */
+typedef mbedtls_md_info_t md_kt_t;
+
+/** Generic cipher %context. */
+typedef mbedtls_cipher_context_t cipher_ctx_t;
+
+/** Generic message digest %context. */
+typedef mbedtls_md_context_t md_ctx_t;
+
+/** Generic HMAC %context. */
+typedef mbedtls_md_context_t hmac_ctx_t;
+
+/** Maximum length of an IV */
+#define OPENVPN_MAX_IV_LENGTH MBEDTLS_MAX_IV_LENGTH
+
+/** Cipher is in CBC mode */
+#define OPENVPN_MODE_CBC MBEDTLS_MODE_CBC
+
+/** Cipher is in OFB mode */
+#define OPENVPN_MODE_OFB MBEDTLS_MODE_OFB
+
+/** Cipher is in CFB mode */
+#define OPENVPN_MODE_CFB MBEDTLS_MODE_CFB
+
+/** Cipher is in GCM mode */
+#define OPENVPN_MODE_GCM MBEDTLS_MODE_GCM
+
+/** Cipher should encrypt */
+#define OPENVPN_OP_ENCRYPT MBEDTLS_ENCRYPT
+
+/** Cipher should decrypt */
+#define OPENVPN_OP_DECRYPT MBEDTLS_DECRYPT
+
+#define MD4_DIGEST_LENGTH 16
+#define MD5_DIGEST_LENGTH 16
+#define SHA_DIGEST_LENGTH 20
+#define DES_KEY_LENGTH 8
+
+/**
+ * Returns a singleton instance of the mbed TLS random number generator.
+ *
+ * For PolarSSL/mbed TLS 1.1+, this is the CTR_DRBG random number generator. If it
+ * hasn't been initialised yet, the RNG will be initialised using the default
+ * entropy sources. Aside from the default platform entropy sources, an
+ * additional entropy source, the HAVEGE random number generator will also be
+ * added. During initialisation, a personalisation string will be added based
+ * on the time, the PID, and a pointer to the random context.
+ */
+mbedtls_ctr_drbg_context *rand_ctx_get();
+
+#ifdef ENABLE_PREDICTION_RESISTANCE
+/**
+ * Enable prediction resistance on the random number generator.
+ */
+void rand_ctx_enable_prediction_resistance();
+#endif
+
+/**
+ * Log the supplied mbed TLS error, prefixed by supplied prefix.
+ *
+ * @param flags Flags to indicate error type and priority.
+ * @param errval mbed TLS error code to convert to error message.
+ * @param prefix Prefix to mbed TLS error message.
+ *
+ * @returns true if no errors are detected, false otherwise.
+ */
+bool mbed_log_err(unsigned int flags, int errval, const char *prefix);
+
+/**
+ * Log the supplied mbed TLS error, prefixed by function name and line number.
+ *
+ * @param flags Flags to indicate error type and priority.
+ * @param errval mbed TLS error code to convert to error message.
+ * @param func Function name where error was reported.
+ * @param line Line number where error was reported.
+ *
+ * @returns true if no errors are detected, false otherwise.
+ */
+bool mbed_log_func_line(unsigned int flags, int errval, const char *func,
+ int line);
+
+/** Wraps mbed_log_func_line() to prevent function calls for non-errors */
+static inline bool mbed_log_func_line_lite(unsigned int flags, int errval,
+ const char *func, int line) {
+ if (errval) {
+ return mbed_log_func_line (flags, errval, func, line);
+ }
+ return true;
+}
+
+/**
+ * Check errval and log on error.
+ *
+ * Convenience wrapper to put around mbed TLS library calls, e.g.
+ * if (!mbed_ok (mbedtls_ssl_func())) return 0;
+ * or
+ * ASSERT (mbed_ok (mbedtls_ssl_func()));
+ *
+ * @param errval mbed TLS error code to convert to error message.
+ *
+ * @returns true if no errors are detected, false otherwise.
+ */
+#define mbed_ok(errval) \
+ mbed_log_func_line_lite(D_CRYPT_ERRORS, errval, __func__, __LINE__)
+
+
+#endif /* CRYPTO_MBEDTLS_H_ */