在此之前运行hmac.New时出现“ undefined：hmac.Equal”错误

Question

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?

Answer 1

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.