mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 19:32:45 +00:00
5e1499d104
This commit un-deprecates DeprecatedString, and repurposes it as a byte
string.
As the null state has already been removed, there are no other
particularly hairy blockers in repurposing this type as a byte string
(what it _really_ is).
This commit is auto-generated:
$ xs=$(ack -l \bDeprecatedString\b\|deprecated_string AK Userland \
Meta Ports Ladybird Tests Kernel)
$ perl -pie 's/\bDeprecatedString\b/ByteString/g;
s/deprecated_string/byte_string/g' $xs
$ clang-format --style=file -i \
$(git diff --name-only | grep \.cpp\|\.h)
$ gn format $(git ls-files '*.gn' '*.gni')
98 lines
2.9 KiB
C++
98 lines
2.9 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 Crypto::Cipher {
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enum class Intent;
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}
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namespace PDF {
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enum class CryptFilterMethod {
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None,
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V2, // RC4
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AESV2,
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AESV3,
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};
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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, ByteString const& o_entry, ByteString const& oe_entry, ByteString const& u_entry, ByteString const& ue_entry, ByteString const& perms, u32 flags, bool encrypt_metadata, size_t length, CryptFilterMethod method);
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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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void crypt(NonnullRefPtr<Object>, Reference reference, Crypto::Cipher::Intent) const;
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ByteBuffer compute_user_password_value_r2(ByteBuffer password_string);
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ByteBuffer compute_user_password_value_r3_to_r5(ByteBuffer password_string);
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bool authenticate_user_password_r2_to_r5(StringView password_string);
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bool authenticate_user_password_r6_and_later(StringView password_string);
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bool authenticate_owner_password_r6_and_later(StringView password_string);
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ByteBuffer compute_encryption_key_r2_to_r5(ByteBuffer password_string);
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bool compute_encryption_key_r6_and_later(ByteBuffer password_string);
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enum class HashKind {
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Owner,
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User,
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};
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ByteBuffer computing_a_hash_r6_and_later(ByteBuffer input, StringView input_password, HashKind);
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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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ByteString m_o_entry;
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ByteString m_oe_entry;
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ByteString m_u_entry;
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ByteString m_ue_entry;
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ByteString m_perms_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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CryptFilterMethod m_method;
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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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