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LibPDF: Implement StandardSecurityHandler::crypt for AESV3

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With this, AESV3 support is complete and CIPA_DC-007-2021_E.pdf
can be opened :^)

(CIPA_DC-003-2020_E.pdf incorrectly cannot be opened yet. This
is due to a minor bug in computing_a_hash_r6_and_later() that
I'll fix a bit later. But except for this minor bug, all AESV3
files I've found so far seem to work.)
This commit is contained in:
Nico Weber 2023-07-19 21:47:02 -04:00 • committed by Andreas Kling
parent 12e77cba0a
commit f26783596d
1 changed files with 13 additions and 12 deletions
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25
Userland/Libraries/LibPDF/Encryption.cpp
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@ -663,18 +663,6 @@ void StandardSecurityHandler::crypt(NonnullRefPtr<Object> object, Reference refe
}
};
if (m_method == CryptFilterMethod::AESV3) {
// ISO 32000 (PDF 2.0), 7.6.3.3 Algorithm 1.A: Encryption of data using the AES algorithms
// a) Use the 32-byte file encryption key for the AES-256 symmetric key algorithm, along with the string or
// stream data to be encrypted.
//
// Use the AES algorithm in Cipher Block Chaining (CBC) mode, which requires an initialization
// vector. The block size parameter is set to 16 bytes, and the initialization vector is a 16-byte random
// number that is stored as the first 16 bytes of the encrypted stream or string.
TODO();
}
ReadonlyBytes bytes;
Function<void(ByteBuffer)> assign;
@ -701,6 +689,19 @@ void StandardSecurityHandler::crypt(NonnullRefPtr<Object> object, Reference refe
VERIFY_NOT_REACHED();
}
if (m_method == CryptFilterMethod::AESV3) {
// ISO 32000 (PDF 2.0), 7.6.3.3 Algorithm 1.A: Encryption of data using the AES algorithms
// a) Use the 32-byte file encryption key for the AES-256 symmetric key algorithm, along with the string or
// stream data to be encrypted.
//
// Use the AES algorithm in Cipher Block Chaining (CBC) mode, which requires an initialization
// vector. The block size parameter is set to 16 bytes, and the initialization vector is a 16-byte random
// number that is stored as the first 16 bytes of the encrypted stream or string.
assign(aes(bytes, m_encryption_key.value()));
return;
}
// 7.6.2 General Encryption Algorithm
// Algorithm 1: Encryption of data using the RC3 or AES algorithms