Summary
Uploading a SSL certificate in AWS is required when setting up a HTTPS load balancer or a cloudfront bucket with HTTPS support. The certificate format required by AWS is likely to differ a little bit from what an SSL provider will give you. This article explains how to convert your SSL certificate into the format expected by AWS
Context
SSL Providers (like GoDaddy) usually provide three things when generating a SSL certificate:
- somedomain.key: this is the private key
- somedomain.crt: this is the public certificate
- provider_bundle.crt: this is the SSL provider bundle (public certificate signing your SSL certificate)
On the other side, AWS expects three things:
- Private Key in pem format
- Public Key Certificate in pem format
- Certificate chain in pem format: this is the bundle provided by your provider
Action
Requirement
You need to have openssl installed on your computer
Let's convert the private key into PEM format
openssl rsa -in somedomain.key -outform PEM -out somedomain.key.pem
That's pretty much it! 
Now upload the content of each file as directed:
- Upload content of somedomain.key.pem to Private Key
- Upload content of somedomain.crt to Public Key Certificate
- Upload content of provider_bundle.crt to Certificate Chain
Example below while setting up a AWS Load Balancer:
