Implement standard security handler (revision 6) #394
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This pull request implements the algorithms for the standard security handler essential to decrypt PDF documents using revision 6 (or later).
The first commit reorganizes the encryption code into its own module since the original file is getting rather big. The module has been split up into the PKCS#5 implementation, the password algorithms, the crypt filters. I have also moved the RC4 implementation to this module.
The second commit removes a
Vec<u8>allocation by using a hasher directly.The third commit merges the remaining algorithm functions into the
PasswordAlgorithmimplementation, such that we can avoid passing the length and revision everywhere.Commits four, five and six implement the file encryption key and password algorithms necessary to decrypt PDF documents (PDF 2.0) using revision 6 of the standard security handler.