mirror of https://github.com/qpdf/qpdf.git
98 lines
3.1 KiB
C++
98 lines
3.1 KiB
C++
// Copyright (c) 2005-2021 Jay Berkenbilt
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//
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// This file is part of qpdf.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Versions of qpdf prior to version 7 were released under the terms
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// of version 2.0 of the Artistic License. At your option, you may
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// continue to consider qpdf to be licensed under those terms. Please
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// see the manual for additional information.
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#ifndef QPDFCRYPTOIMPL_HH
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#define QPDFCRYPTOIMPL_HH
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#include <qpdf/DLL.h>
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#include <string>
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// This class is part of qpdf's pluggable crypto provider support.
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// Most users won't need to know or care about this class, but you can
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// use it if you want to supply your own crypto implementation. To do
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// so, provide an implementation of QPDFCryptoImpl, ensure that you
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// register it by calling QPDFCryptoProvider::registerImpl, and make
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// it the default by calling QPDFCryptoProvider::setDefaultProvider.
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class QPDF_DLL_CLASS QPDFCryptoImpl
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{
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public:
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QPDF_DLL
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QPDFCryptoImpl() = default;
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QPDF_DLL
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virtual ~QPDFCryptoImpl() = default;
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// Random Number Generation
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QPDF_DLL
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virtual void provideRandomData(unsigned char* data, size_t len) = 0;
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// Hashing
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typedef unsigned char MD5_Digest[16];
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QPDF_DLL
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virtual void MD5_init() = 0;
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QPDF_DLL
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virtual void MD5_update(unsigned char const* data, size_t len) = 0;
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QPDF_DLL
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virtual void MD5_finalize() = 0;
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QPDF_DLL
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virtual void MD5_digest(MD5_Digest) = 0;
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QPDF_DLL
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virtual void SHA2_init(int bits) = 0;
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QPDF_DLL
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virtual void SHA2_update(unsigned char const* data, size_t len) = 0;
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QPDF_DLL
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virtual void SHA2_finalize() = 0;
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QPDF_DLL
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virtual std::string SHA2_digest() = 0;
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// Encryption/Decryption
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// QPDF must support RC4 to be able to work with older PDF files
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// and readers. Search for RC4 in README.md
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// key_len of -1 means treat key_data as a null-terminated string
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QPDF_DLL
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virtual void RC4_init(unsigned char const* key_data, int key_len = -1) = 0;
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// out_data = 0 means to encrypt/decrypt in place
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QPDF_DLL
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virtual void RC4_process(unsigned char* in_data, size_t len,
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unsigned char* out_data = 0) = 0;
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QPDF_DLL
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virtual void RC4_finalize() = 0;
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static size_t constexpr rijndael_buf_size = 16;
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QPDF_DLL
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virtual void rijndael_init(
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bool encrypt, unsigned char const* key_data, size_t key_len,
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bool cbc_mode, unsigned char* cbc_block) = 0;
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QPDF_DLL
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virtual void rijndael_process(
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unsigned char* in_data, unsigned char* out_data) = 0;
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QPDF_DLL
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virtual void rijndael_finalize() = 0;
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};
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#endif // QPDFCRYPTOIMPL_HH
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