SQL Server

Encrypt Already Existing Zip

See more Zip Examples

To encrypt an already existing non-encrypted .zip, the application must open the .zip, set the encryption related properties, and then re-write. 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 requires the Chilkat Zip API to have been previously unlocked.
    -- See Unlock Chilkat Zip 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

    -- Open an unencrypted .zip
    EXEC sp_OAMethod @zip, 'OpenZip', @success OUT, 'qa_data/zips/test.zip'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @zip, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @zip
        RETURN
      END

    -- Unzip to a temp directory.
    DECLARE @numFilesUnzipped int
    EXEC sp_OAMethod @zip, 'Unzip', @numFilesUnzipped OUT, 'qa_output/tmp'
    IF @numFilesUnzipped < 0
      BEGIN
        EXEC sp_OAGetProperty @zip, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @zip
        RETURN
      END

    -- Clear the zip object.
    EXEC sp_OAMethod @zip, 'NewZip', @success OUT, 'qa_output/aesTest.zip'

    -- Indicate that 128-bit AES encryption is to be used when writing the .zip
    EXEC sp_OASetProperty @zip, 'Encryption', 4
    EXEC sp_OASetProperty @zip, 'EncryptKeyLength', 128

    -- Set the password.
    EXEC sp_OASetProperty @zip, 'EncryptPassword', 'secret'

    -- Append the files.
    EXEC sp_OASetProperty @zip, 'AppendFromDir', 'qa_output/tmp'
    EXEC sp_OAMethod @zip, 'AppendFiles', @success OUT, '*.*', 1
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @zip, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @zip
        RETURN
      END

    -- Write the .zip and close it.
    EXEC sp_OAMethod @zip, 'WriteZipAndClose', @success OUT
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @zip, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @zip
        RETURN
      END


    PRINT 'Success.'

    EXEC @hr = sp_OADestroy @zip


END
GO