[chef] call the aws ec2 REST API to create the security group or create the instance

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hi,

https://ec2.amazonaws.com/?Action=CreateSecurityGroup
&GroupName=websrv
&GroupDescription=Web Servers
&AUTHPARAMS...

i have access key id and secret access key and this API, what are the
parameters are need for this process we should need signature, token, time
stamp  or not ...it is must means and how to get this with my params.....what
is authparams....


thanks and regards,
Ganesan.A