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(Tcl) Determine if a Zip is Encrypted or Password-Protected

Determines whether or not a zip archive is AES encrypted or password-protected.

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

set zip [new_CkZip]

#  Any string unlocks the component for the 1st 30-days.
set success [CkZip_UnlockComponent $zip "Anything for 30-day trial"]
if {[expr $success != 1]} then {
    puts [CkZip_lastErrorText $zip]
    delete_CkZip $zip
    exit
}

#  An encrypted or password-protected zip can be opened
#  without specifying the password.  However, the contents
#  of the files cannot be unzipped without providing the correct
#  password.

set success [CkZip_OpenZip $zip "something.zip"]
if {[expr $success != 1]} then {
    puts [CkZip_lastErrorText $zip]
    delete_CkZip $zip
    exit
}

#  If the zip is password-protected, meaning that it uses
#  the old (insecure) Zip 2.0 encryption, then the
#  PasswordProtect property will be 1
set bPwdProt [CkZip_get_PasswordProtect $zip]
if {$bPwdProt} then {
    puts "This zip is password-protected."
}

#  If the zip is AES encrypted (WinZip compatible) then
#  the Encryption property will be equal to 4.
set encValue [CkZip_get_Encryption $zip]
if {[expr $encValue == 4]} then {
    puts "This zip is AES encrypted."
}

#  If the Encryption property = 0, then the zip is NOT
#  strong encrypted, and is either password-protected or
#  entirely unencrypted, depending on the value of the
#  PasswordProtect property.

CkZip_CloseZip $zip

delete_CkZip $zip

 

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