mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2025-05-17 16:42:54 +00:00
c4bad2186f
This is a step towards AESV3 support for PDF files. The straight-forward way of writing this with our APIs is pretty allocation-heavy, but this code won't run all that often for the regular "open PDF, check password" flow.
94 lines
2.7 KiB
C++
94 lines
2.7 KiB
C++
/*
|
|
* Copyright (c) 2022, Matthew Olsson <mattco@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/Span.h>
|
|
#include <LibPDF/ObjectDerivatives.h>
|
|
|
|
namespace Crypto::Cipher {
|
|
enum class Intent;
|
|
}
|
|
|
|
namespace PDF {
|
|
|
|
enum class CryptFilterMethod {
|
|
None,
|
|
V2, // RC4
|
|
AESV2,
|
|
AESV3,
|
|
};
|
|
|
|
class SecurityHandler : public RefCounted<SecurityHandler> {
|
|
public:
|
|
static PDFErrorOr<NonnullRefPtr<SecurityHandler>> create(Document*, NonnullRefPtr<DictObject> encryption_dict);
|
|
|
|
virtual ~SecurityHandler() = default;
|
|
|
|
virtual bool try_provide_user_password(StringView password) = 0;
|
|
virtual bool has_user_password() const = 0;
|
|
|
|
virtual void encrypt(NonnullRefPtr<Object>, Reference reference) const = 0;
|
|
virtual void decrypt(NonnullRefPtr<Object>, Reference reference) const = 0;
|
|
};
|
|
|
|
class StandardSecurityHandler : public SecurityHandler {
|
|
public:
|
|
static PDFErrorOr<NonnullRefPtr<StandardSecurityHandler>> create(Document*, NonnullRefPtr<DictObject> encryption_dict);
|
|
|
|
StandardSecurityHandler(Document*, size_t revision, DeprecatedString const& o_entry, DeprecatedString const& u_entry, u32 flags, bool encrypt_metadata, size_t length, CryptFilterMethod method);
|
|
|
|
~StandardSecurityHandler() override = default;
|
|
|
|
bool try_provide_user_password(StringView password_string) override;
|
|
|
|
bool has_user_password() const override { return m_encryption_key.has_value(); }
|
|
|
|
protected:
|
|
void encrypt(NonnullRefPtr<Object>, Reference reference) const override;
|
|
void decrypt(NonnullRefPtr<Object>, Reference reference) const override;
|
|
|
|
private:
|
|
void crypt(NonnullRefPtr<Object>, Reference reference, Crypto::Cipher::Intent) const;
|
|
|
|
ByteBuffer compute_user_password_value_r2(ByteBuffer password_string);
|
|
ByteBuffer compute_user_password_value_r3_to_r5(ByteBuffer password_string);
|
|
|
|
bool authenticate_user_password_r2_to_r5(StringView password_string);
|
|
bool authenticate_user_password_r6_and_later(StringView password_string);
|
|
|
|
ByteBuffer compute_encryption_key_r2_to_r5(ByteBuffer password_string);
|
|
ByteBuffer compute_encryption_key_r6_and_later(ByteBuffer password_string);
|
|
|
|
enum class HashKind {
|
|
Owner,
|
|
User,
|
|
};
|
|
ByteBuffer computing_a_hash_r6_and_later(ByteBuffer input, StringView input_password, HashKind);
|
|
|
|
Document* m_document;
|
|
size_t m_revision;
|
|
Optional<ByteBuffer> m_encryption_key;
|
|
DeprecatedString m_o_entry;
|
|
DeprecatedString m_u_entry;
|
|
u32 m_flags;
|
|
bool m_encrypt_metadata;
|
|
size_t m_length;
|
|
CryptFilterMethod m_method;
|
|
};
|
|
|
|
class RC4 {
|
|
public:
|
|
RC4(ReadonlyBytes key);
|
|
|
|
void generate_bytes(ByteBuffer&);
|
|
ByteBuffer encrypt(ReadonlyBytes bytes);
|
|
|
|
private:
|
|
Array<size_t, 256> m_bytes;
|
|
};
|
|
|
|
}
|