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Secure callouts from Salesforce to Amazon S3

I have developed an application to integrate with Amazon S3 server. I have completed it successfully. I want to do the secure callouts from salesforce to Amazon S3 using the Self-signed and CA-Signed certificate. I have tried with the Self-Signed certificate, but I was unable to do the secure callouts. Can any one help me to do the secured callouts from Salesforce to S3.  I went through the following link " ", but it is not working as expected. 

I have created same application in 2 orgs and created Self signed certificate from one org and added that certificate in S3. But still I was able to do the callouts from 2 orgs and able to get the data from 2 orgs. Can you help me to resolve this issue?
Hi , 

There is Amazon Toolkit for which basically provides API's for you to integrate S3 and

Below is the link.

S3- Link is FREE App for Salesforce - Amazon S3 Connector. Its also available on Appexchange. 

    Attach file related to any Salesforce object on Amazon.
    Ulimited free storage for one year.
    Multiple file uplaod.
    No file size limit for upload.
    File access control capabiliy.
    Track file downloads by users.
    File exlorer capability.

Here is our email address. Let us know if you have any query.