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LibPDF: Add support for AESV2 encryption

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This commit is contained in:
Nico Weber 2023-07-11 09:57:37 -04:00 • committed by Andreas Kling
parent 67d8c8badb
commit 5998072f15
3 changed files with 163 additions and 20 deletions
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15
Userland/Libraries/LibPDF/Encryption.h
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@ -9,8 +9,18 @@
#include <AK/Span.h>
#include <LibPDF/ObjectDerivatives.h>
namespace Crypto::Cipher {
enum class Intent;
}
namespace PDF {
enum class CryptFilterMethod {
None,
V2, // RC4
AESV2,
};
class SecurityHandler : public RefCounted<SecurityHandler> {
public:
static PDFErrorOr<NonnullRefPtr<SecurityHandler>> create(Document*, NonnullRefPtr<DictObject> encryption_dict);
@ -28,7 +38,7 @@ 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);
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;
@ -41,6 +51,8 @@ protected:
void decrypt(NonnullRefPtr<Object>, Reference reference) const override;
private:
void crypt(NonnullRefPtr<Object>, Reference reference, Crypto::Cipher::Intent) const;
ByteBuffer compute_user_password_value_v2(ByteBuffer password_string);
ByteBuffer compute_user_password_value_v3_and_newer(ByteBuffer password_string);
@ -54,6 +66,7 @@ private:
u32 m_flags;
bool m_encrypt_metadata;
size_t m_length;
CryptFilterMethod m_method;
};
class RC4 {