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

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

Download Chilkat 32-bit Zip ActiveX (.msi) (includes objects for .zip, .gz, .bz2, and .Z)

Download All 32-bit Chilkat ActiveX Components (.zip)

Download All 64-bit Chilkat ActiveX Components (.zip)

CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @zip int
    EXEC @hr = sp_OACreate 'Chilkat.Zip2', @zip OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @success int

    --  Any string unlocks the component for the 1st 30-days.
    EXEC sp_OAMethod @zip, 'UnlockComponent', @success OUT, 'Anything for 30-day trial'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @zip, 'LastErrorText', @sTmp0 OUT

        PRINT @sTmp0
        RETURN
      END

    --  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.

    EXEC sp_OAMethod @zip, 'OpenZip', @success OUT, 'something.zip'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @zip, 'LastErrorText', @sTmp0 OUT

        PRINT @sTmp0
        RETURN
      END

    --  If the zip is password-protected, meaning that it uses
    --  the old (insecure) Zip 2.0 encryption, then the
    --  PasswordProtect property will be 1
    DECLARE @bPwdProt int

    EXEC sp_OAGetProperty @zip, 'PasswordProtect', @bPwdProt OUT

    IF @bPwdProt
      BEGIN

        PRINT 'This zip is password-protected.'
      END

    --  If the zip is AES encrypted (WinZip compatible) then
    --  the Encryption property will be equal to 4.
    DECLARE @encValue int

    EXEC sp_OAGetProperty @zip, 'Encryption', @encValue OUT

    IF @encValue = 4
      BEGIN

        PRINT 'This zip is AES encrypted.'
      END

    --  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.

    --  If the Encryption property = 1, 2, or 3, then the zip was
    --  encrypted using AES, Blowfish, or Twofish using a
    --  Chilkat-specific encryption format that was implemented
    --  prior to the publication of the Zip AES standard.

    EXEC sp_OAMethod @zip, 'CloseZip', NULL
END
GO