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// Copyright (c) 2005-2022 Jay Berkenbilt
//
// This file is part of qpdf.
//
// 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.
//
// Versions of qpdf prior to version 7 were released under the terms
// of version 2.0 of the Artistic License. At your option, you may
// continue to consider qpdf to be licensed under those terms. Please
// see the manual for additional information.
#ifndef QPDFCRYPTOIMPL_HH
#define QPDFCRYPTOIMPL_HH
#include <qpdf/DLL.h>
#include <string>
// This class is part of qpdf's pluggable crypto provider support.
// Most users won't need to know or care about this class, but you can
// use it if you want to supply your own crypto implementation. To do
// so, provide an implementation of QPDFCryptoImpl, ensure that you
// register it by calling QPDFCryptoProvider::registerImpl, and make
// it the default by calling QPDFCryptoProvider::setDefaultProvider.
class QPDF_DLL_CLASS QPDFCryptoImpl
{
public:
QPDF_DLL
QPDFCryptoImpl() = default;
QPDF_DLL
virtual ~QPDFCryptoImpl() = default;
// Random Number Generation
QPDF_DLL
virtual void provideRandomData(unsigned char* data, size_t len) = 0;
// Hashing
typedef unsigned char MD5_Digest[16];
QPDF_DLL
virtual void MD5_init() = 0;
QPDF_DLL
virtual void MD5_update(unsigned char const* data, size_t len) = 0;
QPDF_DLL
virtual void MD5_finalize() = 0;
QPDF_DLL
virtual void MD5_digest(MD5_Digest) = 0;
QPDF_DLL
virtual void SHA2_init(int bits) = 0;
QPDF_DLL
virtual void SHA2_update(unsigned char const* data, size_t len) = 0;
QPDF_DLL
virtual void SHA2_finalize() = 0;
QPDF_DLL
virtual std::string SHA2_digest() = 0;
// Encryption/Decryption
// QPDF must support RC4 to be able to work with older PDF files
// and readers. Search for RC4 in README.md
// key_len of -1 means treat key_data as a null-terminated string
QPDF_DLL
virtual void RC4_init(unsigned char const* key_data, int key_len = -1) = 0;
// out_data = 0 means to encrypt/decrypt in place
QPDF_DLL
virtual void RC4_process(
unsigned char const* in_data,
size_t len,
unsigned char* out_data = 0) = 0;
QPDF_DLL
virtual void RC4_finalize() = 0;
static size_t constexpr rijndael_buf_size = 16;
QPDF_DLL
virtual void rijndael_init(
bool encrypt,
unsigned char const* key_data,
size_t key_len,
bool cbc_mode,
unsigned char* cbc_block) = 0;
QPDF_DLL
virtual void
rijndael_process(unsigned char* in_data, unsigned char* out_data) = 0;
QPDF_DLL
virtual void rijndael_finalize() = 0;
};
#endif // QPDFCRYPTOIMPL_HH
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