This section of the documentation discusses how to authenticate against Swift using your Keystone credentials.

You first need to authenticate to keystone, which will look something like this:

curl -H 'content-type: application/json'  \
  -d '{"auth":{"tenantName":"'"$OS_TENANT_NAME"'", 
  "passwordCredentials": {"username":"'"$OS_USERNAME"'",
  "password":"'"$OS_PASSWORD"'"}}}'  \
  http://localhost:5000/v2.0/tokens > keystone.json

This will return a big chunk of JSON; you want to extract the token id. A good for this is jq, which you could use like this:

token=$(jq -r .access.token.id keystone.json )

You will also want to retrieve your swift endpoint from the service catalog returned by keystone:

swift_url=$(jq '.access.serviceCatalog[] |
  select(.name == "swift") | .endpoints[0].publicURL' keystone.json)

Which is going to set swift_url to something like:

http://10.15.0.2:8080/v1/AUTH_c84fde6252d047c380e47b6c868d09e3

Now you can use this URL and your keystone token to create a container:

curl -i -H "x-auth-token: $token" \
  $swift_url/mycontainer -X PUT -H 'content-length: 0'

Which should respond:

HTTP/1.1 201 Created
Content-Length: 0
Content-Type: text/html; charset=UTF-8
Date: Mon, 14 Apr 2014 18:07:00 GMT

Additional examples are in the Object Storage API documentation.