package elb import ( "crypto/hmac" "crypto/sha256" "encoding/base64" "github.com/goamz/goamz/aws" "sort" "strings" ) var b64 = base64.StdEncoding func sign(auth aws.Auth, method, path string, params map[string]string, host string) { params["AWSAccessKeyId"] = auth.AccessKey params["SignatureVersion"] = "2" params["SignatureMethod"] = "HmacSHA256" var keys, sarray []string for k := range params { keys = append(keys, k) } sort.Strings(keys) for _, k := range keys { sarray = append(sarray, aws.Encode(k)+"="+aws.Encode(params[k])) } joined := strings.Join(sarray, "&") payload := method + "\n" + host + "\n" + path + "\n" + joined hash := hmac.New(sha256.New, []byte(auth.SecretKey)) hash.Write([]byte(payload)) signature := make([]byte, b64.EncodedLen(hash.Size())) b64.Encode(signature, hash.Sum(nil)) params["Signature"] = string(signature) }