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Hi,
I am writing an application which must be to open a file protected by a user password.
What is the best solution to secure a file by password ?
I imagine to copy the secured file (encrypted) into a temporary file not secured and open it. But how to do ?
Thank you in advance.
If you intend to copy the contents of a file to an unencrypted file, then don't encrypt it at all :)
I suggest you use some cryptographic streaming algorithm. I have once implemented a RC4 cipher as a QIODevice but you may use some ready made solutions (such as libcrypt from OpenSSL) that will decipher contents of a file into memory where you can access it, read it and wipe it out from memory when you don't need it anymore.
what class file can be used to encyrpt a file ????????
I am using QCA.
Hi, i am creating a texteditor using QT. I was trying to set a password for a file. What mechanism or class should i use to set a password for a file ??
Can you give me a minimal example that how i can make use of it in my project ??
Added after 55 minutes:
What is the QFile::EncoderFn and QFile::DecoderFn used for ??
Depends on your specification - do you want to add a password to a file, or encrypt a file to protect the file being opened without the password ?
Ya. I want to add password for a file so that it will be opened if the password is correct.
As stated before the threads were merged, use the Qt Cryptographic Architecture.
How to use QCA depends on your specifications - the first thing you need is a cipher, and then you need to decide how to encrypt/decrypt the data using your password.
You can find an example here: http://quickgit.kde.org/?p=skrooge.g...kgservices.cpp, in function SKGServices::cryptFile.