SQL Server

Determine if a Zip is Encrypted or Password-Protected

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

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

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

    DECLARE @zip int
    EXEC @hr = sp_OACreate 'Chilkat.Zip', @zip OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        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
        EXEC @hr = sp_OADestroy @zip
        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.

    EXEC sp_OAMethod @zip, 'CloseZip', NULL

    EXEC @hr = sp_OADestroy @zip


END
GO