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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+++ 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_ */