I am developing a web server in go,
at the top I have
import ("net/http"
"log"
"fmt"
"encoding/json"
"encoding/hex"
"time"
"math/rand"
"crypto/sha256"
"crypto/hmac"
"strconv"
"strings"
"github.com/crowdmob/goamz/aws"
"github.com/crowdmob/goamz/dynamodb"
)
later I have
func singSomething(someid string) string {
mac := hmac.New(sha256.New, key)
mac.Write([]byte(id))
b := mac.Sum(nil)
return hex.EncodeToString(b)
}
func validateSignature(id, signature string) bool {
mac := hmac.New(sha256.New, key)
mac.Write([]byte(id))
expectedMAC := mac.Sum(nil)
signatureMAC, err := hex.DecodeString(signature)
if err != nil {
fmt.Println("PROBLEM IN DECODING HUH!")
return false
}
return hmac.Equal(expectedMAC,signatureMAC)
}
I get this error when I issue go run CSServer/CSServer.go:54: undefined: hmac.Equal
Why? What is going on? How come hmac.New is fine but hmac.Equals is not?
Don't know what the problem was,
but after striping down the code and puting it in play.golang.org and seeing that it works fine there bun not on my machine, I checked and the my version, it was go1.0.3 I installed the latest go1.1.2 darwin/amd64 and problem solved, very weird.
Please post minimal, but complete programs when asking. Without that, the only thing I can provide is an example which compiles w/o trouble, ie. the undefined hmac.Equal doesn't demonstrate. There must be some problem elsewhere in the code you didn't show.
package main
import (
"crypto/hmac"
"crypto/sha256"
"encoding/hex"
"fmt"
)
func singSomething(someid string) string {
mac := hmac.New(sha256.New, []byte{})
mac.Write([]byte(someid))
b := mac.Sum(nil)
return hex.EncodeToString(b)
}
func validateSignature(id, signature string) bool {
mac := hmac.New(sha256.New, []byte{})
mac.Write([]byte(id))
expectedMAC := mac.Sum(nil)
signatureMAC, err := hex.DecodeString(signature)
if err != nil {
fmt.Println("PROBLEM IN DECODING HUH!")
return false
}
return hmac.Equal(expectedMAC, signatureMAC)
}
func main() {}