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Security handlers manage encryption and decription of PDF files. The standard security handler uses RC4/MD5 to perform its crypto (AES as well, but that is not yet implemented).
71 lines
2.0 KiB
C++
71 lines
2.0 KiB
C++
/*
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* Copyright (c) 2022, Matthew Olsson <mattco@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Span.h>
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#include <LibPDF/ObjectDerivatives.h>
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namespace PDF {
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class SecurityHandler : public RefCounted<SecurityHandler> {
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public:
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static PDFErrorOr<NonnullRefPtr<SecurityHandler>> create(Document*, NonnullRefPtr<DictObject> encryption_dict);
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virtual ~SecurityHandler() = default;
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virtual bool try_provide_user_password(StringView password) = 0;
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virtual bool has_user_password() const = 0;
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virtual void encrypt(NonnullRefPtr<Object>, Reference reference) const = 0;
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virtual void decrypt(NonnullRefPtr<Object>, Reference reference) const = 0;
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};
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class StandardSecurityHandler : public SecurityHandler {
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public:
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static PDFErrorOr<NonnullRefPtr<StandardSecurityHandler>> create(Document*, NonnullRefPtr<DictObject> encryption_dict);
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StandardSecurityHandler(Document*, size_t revision, String const& o_entry, String const& u_entry, u32 flags, bool encrypt_metadata, size_t length);
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~StandardSecurityHandler() override = default;
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bool try_provide_user_password(StringView password_string) override;
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bool has_user_password() const override { return m_encryption_key.has_value(); }
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protected:
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void encrypt(NonnullRefPtr<Object>, Reference reference) const override;
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void decrypt(NonnullRefPtr<Object>, Reference reference) const override;
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private:
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template<bool is_revision_2>
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ByteBuffer compute_user_password_value(ByteBuffer password_string);
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ByteBuffer compute_encryption_key(ByteBuffer password_string);
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Document* m_document;
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size_t m_revision;
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Optional<ByteBuffer> m_encryption_key;
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String m_o_entry;
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String m_u_entry;
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u32 m_flags;
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bool m_encrypt_metadata;
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size_t m_length;
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};
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class RC4 {
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public:
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RC4(ReadonlyBytes key);
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void generate_bytes(ByteBuffer&);
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ByteBuffer encrypt(ReadonlyBytes bytes);
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private:
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Array<size_t, 256> m_bytes;
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};
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}
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