Remove Zip Encryption

Opens an encrypted zip archive and rewrites it with no encrypton.

Downloads for Windows/Linux and Install Instructions

require 'rubygems'
require 'chilkat'

zip = Chilkat::CkZip.new()

#  Any string unlocks the component for the 1st 30-days.
success = zip.UnlockComponent("Anything for 30-day trial")
if (success != true)
    print zip.lastErrorText() + "\n"
    exit
end

#  An encrypted .zip may be "opened" without providing a
#  password.  However, the contents cannot be unzipped
#  without setting the DecryptPassword property.
success = zip.OpenZip("myEncrypted.zip")
if (success != true)
    print zip.lastErrorText() + "\n"
    exit
end

#  Set the DecryptPassword property:
zip.put_DecryptPassword("myPassword")

#  Indicate that when the zip is to be written again,
#  it should be neither AES encrypted, or password-protected
#  (i.e. older Zip 2.0 encryption)
zip.put_Encryption(0)
zip.put_PasswordProtect(false)

#  Set the filename of the new unencrypted .zip to be written:
zip.put_FileName("unencrypted.zip")

#  Write the unencrypted .zip
#  What happens during WriteZipAndClose?  --
#  The encrypted entries from myEncrypted.zip are streamed in,
#  decrypted, and then written out directly into unencrypted.zip
#  In other words, internally the component is smart enough
#  to stream the data from the existing .zip to the new .zip
#  automatically, decrypting in the process..
success = zip.WriteZipAndClose()
if (success != true)
    print zip.lastErrorText() + "\n"
    exit
end

print "OK!" + "\n"