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LibPDF: Move "7.6.2 General Encryption Algorithm" comment down a bit

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The algorithm really only starts a bit later in the function,
so move the comment to there.
This commit is contained in:
Nico Weber 2023-07-19 21:45:17 -04:00 • committed by Andreas Kling
parent 6d0dbaf9d7
commit 12e77cba0a
1 changed files with 16 additions and 16 deletions
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32
Userland/Libraries/LibPDF/Encryption.cpp
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@ -675,22 +675,6 @@ void StandardSecurityHandler::crypt(NonnullRefPtr<Object> object, Reference refe
TODO();
}
// 7.6.2 General Encryption Algorithm
// Algorithm 1: Encryption of data using the RC3 or AES algorithms
// a) Obtain the object number and generation number from the object identifier of
// the string or stream to be encrypted. If the string is a direct object, use
// the identifier of the indirect object containing it.
//
// Note: This is always passed in at parse time because objects don't know their own
// object number.
// b) For all strings and streams with crypt filter specifier; treating the object
// number as binary integers, extend the original n-byte encryption key to n + 5
// bytes by appending the low-order 3 bytes of the object number and the low-order
// 2 bytes of the generation number in that order, low-order byte first. ...
auto encryption_key = m_encryption_key.value();
ReadonlyBytes bytes;
Function<void(ByteBuffer)> assign;
@ -717,6 +701,22 @@ void StandardSecurityHandler::crypt(NonnullRefPtr<Object> object, Reference refe
VERIFY_NOT_REACHED();
}
// 7.6.2 General Encryption Algorithm
// Algorithm 1: Encryption of data using the RC3 or AES algorithms
// a) Obtain the object number and generation number from the object identifier of
// the string or stream to be encrypted. If the string is a direct object, use
// the identifier of the indirect object containing it.
//
// Note: This is always passed in at parse time because objects don't know their own
// object number.
// b) For all strings and streams with crypt filter specifier; treating the object
// number as binary integers, extend the original n-byte encryption key to n + 5
// bytes by appending the low-order 3 bytes of the object number and the low-order
// 2 bytes of the generation number in that order, low-order byte first. ...
auto encryption_key = m_encryption_key.value();
auto index = reference.as_ref_index();
auto generation = reference.as_ref_generation_index();