CensusService: add `method` field required for signature

Signed-off-by: p4u <p4u@dabax.net>

cmd/censushttp/README.md

@@ -43,7 +43,7 @@ The next table shows the available methods and its relation with the fields.
 
 ## Signature
 
-The signature provides authentication by signing a concatenation of the following strings (even if empty) without spaces: `censusId rootHash claimData timeStamp`.
+The signature provides authentication by signing a concatenation of the following strings (even if empty) without spaces: `method censusId rootHash claimData timeStamp`.
 
 The `timeStamp` when received on the server side must not differ more than 10 seconds from the current UNIX time.
 

service/census/censusmanager.go

@@ -118,9 +118,9 @@ func opHandler(c *Claim) *Result {
 	var err error
 
 	// Process data
-	log.Printf("censusId:{%s} rootHash:{%s} claimData:{%s} proofData:{%s} timeStamp:{%s} signature:{%s}\n",
-		c.CensusID, c.RootHash, c.ClaimData, c.ProofData, c.TimeStamp, c.Signature)
-	authString := fmt.Sprintf("%s%s%s%s", c.CensusID, c.RootHash, c.ClaimData, c.TimeStamp)
+	log.Printf("censusId:{%s} method:{%s} rootHash:{%s} claimData:{%s} proofData:{%s} timeStamp:{%s} signature:{%s}\n",
+		c.CensusID, c.Method, c.RootHash, c.ClaimData, c.ProofData, c.TimeStamp, c.Signature)
+	authString := fmt.Sprintf("%s%s%s%s%s", c.Method, c.CensusID, c.RootHash, c.ClaimData, c.TimeStamp)
 	resp.Error = false
 	resp.Response = ""
 	censusFound := false