c++ - AES 256 bit encryption in pdf file -

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i working on pdf security , trying encrypt user , owner password using aes 256-bit encryption algo.

i have generated these keys (using crypto library) when these keys written in pdf encryption dictionary not seem work. (acrobat not open file)

i have explored itextsharp encryption of pdf file. want decrypt file how idea how itextsharp has done it. unfortunately did not find tool so. file encrypted using itextsharp correctly opened in adobe acrobat.

while encrypting keys have use saslprep (ietf rfc 4013) profile of stringprep (ietf rfc 3454). thing want add lib icu can generate saslprep (ietf rfc 4013) profile easily.


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