Uploading multiple large files via a browser and verifying the upload

I need to allow web users to:

• upload multiple files via a browser
• upload large files (> 2GB)
• verify the upload was not corrupted

I've seen recommendations for Uploadify and Jumploader, however, it isn't clear to me if these applications verify the uploaded file (such as, comparing MD5 of client-si开发者_如何学Gode file vs. uploaded). The application must support event hooks prior to and post upload. Any suggestions?