Crypter.h

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// Copyright 2024 libsese
//
// 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 <sese/io/InputBuffer.h>
 
namespace sese::security::evp {
 
class Crypter {
public:
    virtual ~Crypter() = default;
 
    virtual int update(void *out, int &out_len, const void *in, int in_len) const noexcept = 0;
 
    virtual int final(void *out, int &out_len) const noexcept = 0;
};
 
struct CrypterContext {
    using Ptr = std::unique_ptr<CrypterContext>;
 
    io::InputBuffer key;
    io::InputBuffer vector;
    const void *crypter_pointer{};
};
 
class Decrypter final : public Crypter {
public:
    explicit Decrypter(const CrypterContext::Ptr &crypter_context);
 
    ~Decrypter() override;
 
    int update(void *out, int &out_len, const void *in, int in_len) const noexcept override;
 
    int final(void *out, int &out_len) const noexcept override;
 
private:
    void *ctx_;
    const CrypterContext::Ptr &crypter_context_;
};
 
class Encrypter final : public Crypter {
public:
    explicit Encrypter(const CrypterContext::Ptr &crypter_context);
 
    ~Encrypter() override;
 
    int update(void *out, int &out_len, const void *in, int in_len) const noexcept override;
 
    int final(void *out, int &out_len) const noexcept override;
 
private:
    void *ctx_;
    const CrypterContext::Ptr &crypter_context_;
};
 
}