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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)))
}
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