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

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

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

$zip = New-Object Chilkat.Zip

# 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.

$success = $zip.OpenZip("something.zip")
if ($success -ne $true) {
    $($zip.LastErrorText)
    exit
}

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

# If the zip is AES encrypted (WinZip compatible) then
# the Encryption property will be equal to 4.
$encValue = $zip.Encryption
if ($encValue -eq 4) {
    $("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.

$zip.CloseZip()