Merge commit '86cc97e55fe346502462284d2e636a2b3708163e' as 'Sources/OpenVPN3'

2026-04-24 00:00:05 +08:00 · 2020-02-24 14:43:11 +03:00
parent 133b3756e6 86cc97e55f
commit 32f1555929
655 changed files with 146468 additions and 0 deletions
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+//    OpenVPN -- An application to securely tunnel IP networks
+//               over a single port, with support for SSL/TLS-based
+//               session authentication and key exchange,
+//               packet encryption, packet authentication, and
+//               packet compression.
+//
+//    Copyright (C) 2012-2017 OpenVPN Inc.
+//
+//    This program is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Affero General Public License Version 3
+//    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 Affero General Public License for more details.
+//
+//    You should have received a copy of the GNU Affero General Public License
+//    along with this program in the COPYING file.
+//    If not, see <http://www.gnu.org/licenses/>.
+
+// Wrap the mbed TLS HMAC API defined in <mbedtls/md.h> so
+// that it can be used as part of the crypto layer of the OpenVPN core.
+
+#ifndef OPENVPN_MBEDTLS_CRYPTO_HMAC_H
+#define OPENVPN_MBEDTLS_CRYPTO_HMAC_H
+
+#include <string>
+
+#include <openvpn/common/size.hpp>
+#include <openvpn/common/exception.hpp>
+#include <openvpn/mbedtls/crypto/digest.hpp>
+
+namespace openvpn {
+  namespace MbedTLSCrypto {
+    class HMACContext
+    {
+      HMACContext(const HMACContext&) = delete;
+      HMACContext& operator=(const HMACContext&) = delete;
+
+    public:
+      OPENVPN_SIMPLE_EXCEPTION(mbedtls_hmac_uninitialized);
+      OPENVPN_EXCEPTION(mbedtls_hmac_error);
+
+      enum {
+	MAX_HMAC_SIZE = MBEDTLS_MD_MAX_SIZE
+      };
+
+      HMACContext()
+	: initialized(false)
+      {
+      }
+
+      HMACContext(const CryptoAlgs::Type digest, const unsigned char *key, const size_t key_size)
+	: initialized(false)
+      {
+	init(digest, key, key_size);
+      }
+
+      ~HMACContext() { erase() ; }
+
+      void init(const CryptoAlgs::Type digest, const unsigned char *key, const size_t key_size)
+      {
+	erase();
+	ctx.md_ctx = nullptr;
+
+	mbedtls_md_init(&ctx);
+	if (mbedtls_md_setup(&ctx, DigestContext::digest_type(digest), 1) < 0)
+	  throw mbedtls_hmac_error("mbedtls_md_setup");
+	if (mbedtls_md_hmac_starts(&ctx, key, key_size) < 0)
+	  throw mbedtls_hmac_error("mbedtls_md_hmac_starts");
+	initialized = true;
+      }
+
+      void reset()
+      {
+	check_initialized();
+	if (mbedtls_md_hmac_reset(&ctx) < 0)
+	  throw mbedtls_hmac_error("mbedtls_md_hmac_reset");
+      }
+
+      void update(const unsigned char *in, const size_t size)
+      {
+	check_initialized();
+	if (mbedtls_md_hmac_update(&ctx, in, size) < 0)
+	  throw mbedtls_hmac_error("mbedtls_md_hmac_update");
+      }
+
+      size_t final(unsigned char *out)
+      {
+	check_initialized();
+	if (mbedtls_md_hmac_finish(&ctx, out) < 0)
+	  throw mbedtls_hmac_error("mbedtls_md_hmac_finish");
+	return size_();
+      }
+
+      size_t size() const
+      {
+	check_initialized();
+	return size_();
+      }
+
+      bool is_initialized() const { return initialized; }
+
+    private:
+      void erase()
+      {
+	if (initialized)
+	  {
+	    mbedtls_md_free(&ctx);
+	    initialized = false;
+	  }
+      }
+
+      size_t size_() const
+      {
+	return mbedtls_md_get_size(ctx.md_info);
+      }
+
+      void check_initialized() const
+      {
+#ifdef OPENVPN_ENABLE_ASSERT
+	if (!initialized)
+	  throw mbedtls_hmac_uninitialized();
+#endif
+      }
+
+      bool initialized;
+      mbedtls_md_context_t ctx;
+    };
+  }
+}
+
+#endif