Remove Zip Encryption

Opens an encrypted zip archive and rewrites it with no encrypton.

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 .zip may be "opened" without providing a
    --  password.  However, the contents cannot be unzipped
    --  without setting the DecryptPassword property.
    EXEC sp_OAMethod @zip, 'OpenZip', @success OUT, 'myEncrypted.zip'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @zip, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        RETURN
      END

    --  Set the DecryptPassword property:
    EXEC sp_OASetProperty @zip, 'DecryptPassword', 'myPassword'

    --  Indicate that when the zip is to be written again,
    --  it should be neither AES encrypted, or password-protected
    --  (i.e. older Zip 2.0 encryption)
    EXEC sp_OASetProperty @zip, 'Encryption', 0
    EXEC sp_OASetProperty @zip, 'PasswordProtect', 0

    --  Set the filename of the new unencrypted .zip to be written:
    EXEC sp_OASetProperty @zip, 'FileName', 'unencrypted.zip'

    --  Write the unencrypted .zip
    --  What happens during WriteZipAndClose?  --
    --  The encrypted entries from myEncrypted.zip are streamed in,
    --  decrypted, and then written out directly into unencrypted.zip
    --  In other words, internally the component is smart enough
    --  to stream the data from the existing .zip to the new .zip
    --  automatically, decrypting in the process..
    EXEC sp_OAMethod @zip, 'WriteZipAndClose', @success OUT
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @zip, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        RETURN
      END

    PRINT 'OK!'

END
GO