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Top Forums Shell Programming and Scripting Find the original file size of encrypted file Post 303000809 by rbatte1 on Thursday 20th of July 2017 06:12:44 AM
Old 07-20-2017
i think that if you have a huge input file, it will take time whatever method you use. There is no table-of-contents idea, so there is no way to know what the expected size will be. Perhaps you could consider a different approach:-
  • Get the file name & size of the plain file before encryption
  • Get a checksum of the file after encryption and link to the above
When you need the information, you can get the values from wherever you stored it a validate that the encrypted file is the same one by generating the current checksum.

It will still read the file to generate the checksum when you want to validate it, but it does not need to do decryption processing, so that might save a bit.


Basically though, large files will take time.......



Robin
 

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CRYPTDIR(1)                                                   General Commands Manual                                                  CRYPTDIR(1)

NAME
cryptdir - encrypt/decrypt all files in a directory SYNOPSIS
cryptdir [ dir ] decryptdir [ dir ] INTRODUCTION
cryptdir encrypts all files in the current directory (or the given directory if one is provided as an argument). When called as decryptdir (i.e., same program, different name), all files are decrypted. NOTES
When encrypting, you are prompted twice for the password as a precautionary measure. It would be a disaster to encrypt files with a pass- word that wasn't what you intended. In contrast, when decrypting, you are only prompted once. If it's the wrong password, no harm done. Encrypted files have the suffix .crypt appended. This prevents files from being encrypted twice. The suffix is removed upon decryption. Thus, you can easily add files to an encrypted directory and run cryptdir on it without worrying about the already encrypted files. BUGS
The man page is longer than the program. SEE ALSO
"Exploring Expect: A Tcl-Based Toolkit for Automating Interactive Programs" by Don Libes, O'Reilly and Associates, January 1995. AUTHOR
Don Libes, National Institute of Standards and Technology 1 January 1993 CRYPTDIR(1)
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