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Compression, encryption, encoding and the reverse ...

Compression, encryption, encoding and the reverse ...

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Posted by Nick Gammon Australia (22,975 posts) bio Forum Administrator

Date

Thu 09 Dec 2004 03:40 AM (UTC)

Amended on Thu 09 Dec 2004 03:47 AM (UTC) by Nick Gammon

Message

Putting it all together now, we can make a simple function that is handy for sending encrypted messages to friends.


function compress_encrypt_encode (s, k)
  return utils.base64encode (aes.encrypt (utils.compress (s), k), true)
end -- compress_encrypt_encode 

function decode_decrypt_decompress (s, k)
  return utils.decompress (aes.decrypt (utils.base64decode (s), k))
end  -- decode_decrypt_decompress

The function compress_encrypt_encode:

Compresses the text you supply
Encrypts it with the supplied key
Base-64 encodes it, suitable for putting in an email or "tell" or similar (change "true" to "false" if you want a single-line rather than breaking every 76 columns)

Example:



print (compress_encrypt_encode (

[[

Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

]], "swordfish"))



Output



D4TNSdaDQhfnozmTc8bm9atmofRB+sxmJTUnThGMAvPnKjAPYX+jCJ08cB+uAynt5kX97hHiDma5

EQm14twOsY4hIylmQYtcquZjgCWCu2/sN/lumDYa6IDJiVr+7OI3ajsqR5TPK1BPHe4SrdTt1ntj

XnkDA6GmAI6DJQ7tprRfRZKqO8czeC1dju/dktvlHFZSrmj06HfIsaXyVwwMxFGMMR/RcjyC9Zwq

x3qRLx/vOt1rIbApY4CyNRP+AmfU346sOkG90Yh5OO9DnUU6M+gliRlplQ6+DGdoLe61+tQwaXQj

YOm9v2Qw+PnYLGiyv/ElrKo1n9+tGuD8fCDHMJOHizUrGCBloQMVoVG3h9hlgWJPMBHmxSwn3Go2

wjgFV9SWpznXkngXSt1F5YPgkA==

The function decode_decrypt_decompress:

Decodes the base-64 encoded text
Decrypts it with the supplied key
Decompresses it

Example (using above results as input):



/print (decode_decrypt_decompress ([[

D4TNSdaDQhfnozmTc8bm9atmofRB+sxmJTUnThGMAvPnKjAPYX+jCJ08cB+uAynt5kX97hHiDma5

EQm14twOsY4hIylmQYtcquZjgCWCu2/sN/lumDYa6IDJiVr+7OI3ajsqR5TPK1BPHe4SrdTt1ntj

XnkDA6GmAI6DJQ7tprRfRZKqO8czeC1dju/dktvlHFZSrmj06HfIsaXyVwwMxFGMMR/RcjyC9Zwq

x3qRLx/vOt1rIbApY4CyNRP+AmfU346sOkG90Yh5OO9DnUU6M+gliRlplQ6+DGdoLe61+tQwaXQj

YOm9v2Qw+PnYLGiyv/ElrKo1n9+tGuD8fCDHMJOHizUrGCBloQMVoVG3h9hlgWJPMBHmxSwn3Go2

wjgFV9SWpznXkngXSt1F5YPgkA==

]], "swordfish"))



Output



Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

- Nick Gammon

www.gammon.com.au, www.mushclient.com

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Posted by

Nick Gammon Australia (22,975 posts)

bio Forum Administrator

Date

Reply #1 on Thu 09 Dec 2004 03:42 AM (UTC)

Message

This is where Lua's multi-line quotes [[ and ]] come into handy. You can just use those and copy and paste swags of text inbetween them.

- Nick Gammon

www.gammon.com.au, www.mushclient.com

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