REBOL [ Title: "En-/decryption Functions" Date: 20-Jul-1999 File: %encrypt.r Author: "Bohdan Lechnowsky" Usage: { Put the command: do %encrypt.r near the beginning of your %user.r file. Once it has been run, do the following: >> write/binary %pass.r encrypt "password-here" Whenever you need to assign that particular password, do the following (this example shows setting the default proxy password): system/schemes/default/proxy/pass: decrypt read %pass.r } Purpose: "A basic encryption scheme." library: [ level: 'intermediate platform: none type: 'tool domain: 'file-handling tested-under: none support: none license: none see-also: none ] ] hash: func [ "Returns a hash value for a string" string [string!] value [integer!] ][ (checksum string) // value ] encrypt: func [ "Encrypts a string" string [string!] /local shift-val codeword ][ codeword: "mycode" ;-- change as needed shift-val: hash codeword 8 if zero? shift-val [shift-val: 5] string: shift enbase/base compress string 2 shift-val to-string load append insert head string "2#{" "}" ] decrypt: func [ "Decrypts an encrypted string" string [string!] /local shift-val codeword ][ codeword: "mycode" ;-- change as needed shift-val: hash codeword 8 if zero? shift-val [shift-val: 5] string: shift/right enbase/base string 2 shift-val to-string decompress load append insert head string "2#{" "}" ] shift: func [ "Takes a base-2 binary string and shifts bits" data [string!] places [integer!] /left /right /local first-bits last-bits ][ if any [places < 1 places >= length? data] [ print "ERROR: Shift places exceeds length of binary data or is invalid" return none ] either right [ last-bits: copy/part tail data (places * -1) remove/part tail data (places * -1) data: head insert head data last-bits ][ first-bits: copy/part data places remove/part data places append data first-bits ] return data ]