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LibPDF: Some preparatory work for AESV3

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This detects AESV3, and copies over the spec comments explaining what
needs to be done, but doesn't actually do it yet.

AESV3 is technically PDF 2.0-only, but
https://cipa.jp/std/documents/download_e.html?CIPA_DC-007-2021_E has a
1.7 PDF that uses it.

Previously we'd claim that we need a password to decrypt it.
Now, we cleanly crash with a TODO() \o/
This commit is contained in:
Nico Weber 2023-07-13 21:35:26 -04:00 • committed by Andreas Kling
parent b14d51ba1b
commit 281e3158c0
2 changed files with 152 additions and 21 deletions
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12
Userland/Libraries/LibPDF/Encryption.h
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@ -19,6 +19,7 @@ enum class CryptFilterMethod {
None,
V2, // RC4
AESV2,
AESV3,
};
class SecurityHandler : public RefCounted<SecurityHandler> {
@ -53,10 +54,15 @@ protected:
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);
ByteBuffer compute_user_password_value_r2(ByteBuffer password_string);
ByteBuffer compute_user_password_value_r3_to_r5(ByteBuffer password_string);
ByteBuffer compute_encryption_key(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);
ByteBuffer computing_a_hash_r6_and_later(ByteBuffer password_string);
Document* m_document;
size_t m_revision;