revel/libs.go at master · golib/revel

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package revel

import (

"crypto/hmac"

"crypto/sha1"

"encoding/hex"

"io"

)

// Sign a given string with the app-configured secret key.

// If no secret key is set, returns the empty string.

// Return the signature in base64 (URLEncoding).

func Sign(message string) string {

if len(secretKey) == 0 {

return ""

}

mac := hmac.New(sha1.New, secretKey)

io.WriteString(mac, message)

return hex.EncodeToString(mac.Sum(nil))

}

// Verify returns true if the given signature is correct for the given message.

// e.g. it matches what we generate with Sign()

func Verify(message, sig string) bool {

return hmac.Equal([]byte(sig), []byte(Sign(message)))

}