mirror of
https://github.com/deneraraujo/OpenVPNAdapter.git
synced 2026-02-11 00:00:08 +08:00
146 lines
3.6 KiB
C++
146 lines
3.6 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2017 OpenVPN Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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#ifndef OPENVPN_APPLECRYPTO_CRYPTO_HMAC_H
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#define OPENVPN_APPLECRYPTO_CRYPTO_HMAC_H
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// Wrap the Apple HMAC API defined in <CommonCrypto/CommonHMAC.h> so that
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// it can be used as part of the crypto layer of the OpenVPN core.
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#include <string>
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#include <cstring>
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#include <CommonCrypto/CommonHMAC.h>
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#include <openvpn/common/size.hpp>
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#include <openvpn/common/exception.hpp>
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#include <openvpn/applecrypto/crypto/digest.hpp>
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namespace openvpn {
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namespace AppleCrypto {
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class HMACContext
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{
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HMACContext(const HMACContext&) = delete;
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HMACContext& operator=(const HMACContext&) = delete;
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public:
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OPENVPN_EXCEPTION(digest_cannot_be_used_with_hmac);
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OPENVPN_SIMPLE_EXCEPTION(hmac_uninitialized);
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OPENVPN_SIMPLE_EXCEPTION(hmac_keysize_error);
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enum {
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MAX_HMAC_SIZE = DigestContext::MAX_DIGEST_SIZE,
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MAX_HMAC_KEY_SIZE = 128,
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};
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HMACContext()
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{
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state = PRE;
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}
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HMACContext(const CryptoAlgs::Type digest, const unsigned char *key, const size_t key_size)
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{
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init(digest, key, key_size);
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}
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~HMACContext()
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{
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}
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void init(const CryptoAlgs::Type digest, const unsigned char *key, const size_t key_size)
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{
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state = PRE;
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info = DigestContext::digest_type(digest);
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digest_size_ = CryptoAlgs::size(digest);
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hmac_alg = info->hmac_alg();
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if (hmac_alg == DigestInfo::NO_HMAC_ALG)
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throw digest_cannot_be_used_with_hmac(info->name());
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if (key_size > MAX_HMAC_KEY_SIZE)
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throw hmac_keysize_error();
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std::memcpy(key_, key, key_size_ = key_size);
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state = PARTIAL;
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}
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void reset() // Apple HMAC API is missing reset method, so we have to reinit
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{
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cond_reset(true);
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}
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void update(const unsigned char *in, const size_t size)
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{
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cond_reset(false);
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CCHmacUpdate(&ctx, in, size);
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}
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size_t final(unsigned char *out)
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{
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cond_reset(false);
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CCHmacFinal(&ctx, out);
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return digest_size_;
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}
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size_t size() const
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{
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if (!is_initialized())
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throw hmac_uninitialized();
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return digest_size_;
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}
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bool is_initialized() const
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{
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return state >= PARTIAL;
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}
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private:
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void cond_reset(const bool force_init)
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{
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switch (state)
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{
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case PRE:
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throw hmac_uninitialized();
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case READY:
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if (!force_init)
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return;
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case PARTIAL:
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CCHmacInit(&ctx, hmac_alg, key_, key_size_);
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state = READY;
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}
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}
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enum State {
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PRE=0,
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PARTIAL,
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READY
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};
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int state;
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const DigestInfo *info;
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CCHmacAlgorithm hmac_alg;
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size_t key_size_;
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size_t digest_size_;
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unsigned char key_[MAX_HMAC_KEY_SIZE];
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CCHmacContext ctx;
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};
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}
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}
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#endif
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