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/*
* Copyright (c) 2017-2021 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <hicn/transport/auth/common.h>
#include <hicn/transport/auth/crypto_hash.h>
#include <hicn/transport/auth/crypto_suite.h>
#include <hicn/transport/errors/errors.h>
#include <hicn/transport/utils/membuf.h>
extern "C" {
#include <openssl/evp.h>
#include <openssl/hmac.h>
}
namespace transport {
namespace auth {
class Identity;
class Signer {
// The base class from which all signer classes derive.
friend class Identity;
public:
Signer();
virtual ~Signer();
// Sign a packet.
virtual void signPacket(PacketPtr packet);
virtual void signBuffer(const std::vector<uint8_t> &buffer);
virtual void signBuffer(const utils::MemBuf *buffer);
// Return the signature.
std::vector<uint8_t> getSignature() const;
// Return the signature size in bytes.
virtual std::size_t getSignatureSize() const;
// Return the field size necessary to hold the signature. The field size is
// always a multiple of 4. Use this function when allocating the signature
// packet header.
virtual std::size_t getSignatureFieldSize() const;
// Return the crypto suite associated to the signer.
CryptoSuite getSuite() const;
// Return the hash algorithm associated to the signer.
CryptoHashType getHashType() const;
protected:
CryptoSuite suite_;
std::vector<uint8_t> signature_;
std::size_t signature_len_;
std::shared_ptr<EVP_PKEY> key_;
CryptoHash key_id_;
};
class VoidSigner : public Signer {
// This class is the default socket signer. It does not sign packet.
public:
VoidSigner() = default;
void signPacket(PacketPtr packet) override;
void signBuffer(const std::vector<uint8_t> &buffer) override;
void signBuffer(const utils::MemBuf *buffer) override;
};
class AsymmetricSigner : public Signer {
// This class uses asymmetric verification to sign packets.
public:
AsymmetricSigner() = default;
// Construct an AsymmetricSigner from a key store and a given crypto suite.
AsymmetricSigner(CryptoSuite suite, std::shared_ptr<EVP_PKEY> key,
std::shared_ptr<EVP_PKEY> pub_key);
std::size_t getSignatureFieldSize() const override;
};
class SymmetricSigner : public Signer {
// This class uses symmetric verification to sign packets. The symmetric
// key is derived from a passphrase.
public:
SymmetricSigner() = default;
// Construct a SymmetricSigner from a passphrase and a given crypto suite.
SymmetricSigner(CryptoSuite suite, const std::string &passphrase);
};
} // namespace auth
} // namespace transport
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