Build webservice on AWS

I need a webservice that creates a elliptical curve certification which registrates this certification in AWS, then creates in AWS IoT a "Thing" and then attach this certification in this "Thing" and finally, that returns the certification and the key. We can create a HTTP Lambda function in AWS that executes all this: Request Syntax: =============================== POST /new-device HTTP/1.1 Content-type: application/json { "macAddress": "string" } =============================== ----------------------------------------------------------------------------------------------------------- 1) Generates certification key: Linux prompt: openssl ecparam -name prime256v1 -genkey -out [login to view URL] ----------------------------------------------------------------------------------------------------------- 2) create certification through the key generated before: Linux prompt: openssl req -new -sha256 -key [login to view URL] -nodes -out [login to view URL] (leave all fields requested blank: just type <enter>) ----------------------------------------------------------------------------------------------------------- 3) Create the certification in AWS: send [login to view URL] to the API and receive the certification in PEM format: [login to view URL] (use API with the ativation: setAsActive) ----------------------------------------------------------------------------------------------------------- 4) Attach the certification to a AWS policy: Request Syntax Example: =============================== PUT /target-policies/policyName HTTP/1.1 Content-type: application/json { "target": "arn:aws:iot:us-east-1:754834753196:cert/d211d2ad05a65a305d5192f57187daf4d3854c662923fd5bb99b9b9d5ea04583" } =============================== [login to view URL] ----------------------------------------------------------------------------------------------------------- 5) Create thing/dispositive in AWS: [login to view URL] (create dispositive through MAC to have a unique name) ----------------------------------------------------------------------------------------------------------- 6) Attach the certification in thing/dispositive in AWS: [login to view URL] ----------------------------------------------------------------------------------------------------------- 7) Convert the certification key to base64 (TLSKey1): Linux prompt: openssl ec -in [login to view URL] -inform PEM -outform DER | openssl asn1parse -inform DER | head -3 | tail -1 | awk -F':' '{ print $4 }' | xxd -r -p | base64 | echo "$(</dev/stdin)" ----------------------------------------------------------------------------------------------------------- 8) Convert certification to base64 (TLSKey2): Linux prompt: openssl x509 -in [login to view URL] -inform PEM -outform DER | base64 | echo "$(</dev/stdin)" ----------------------------------------------------------------------------------------------------------- Response Syntax: =============================== HTTP/1.1 200 Content-type: application/json { "certArn": "string", "thingArn": "string", "thingId": "string", "thingName": "string" "TLSKey1": "string", "TLSKey2": "string" } =============================== Useful links: [login to view URL] [login to view URL] [login to view URL]