fix unfold DKIM header on verify

dkim.go

@@ -473,7 +473,6 @@ func verifySignature(toSign []byte, sig64 string, key *rsa.PublicKey, algo strin
 		return ErrVerifyInappropriateHashAlgo
 	}
 
-	//fmt.Printf("|%s|", toSign)
 	h1.Write(toSign)
 	sig, err := base64.StdEncoding.DecodeString(sig64)
 	if err != nil {

dkimHeader.go

@@ -315,7 +315,11 @@ func parseDkHeader(header string) (dkh *dkimHeader, err error) {
 	dkh.MessageCanonicalization = "simple/simple"
 	dkh.QueryMethods = []string{"dns/txt"}
 
-	fs := strings.Split(keyVal[1], ";")
+	// unfold && clean
+	val := removeFWS(keyVal[1])
+	val = strings.Replace(val, " ", "", -1)
+
+	fs := strings.Split(val, ";")
 	for _, f := range fs {
 		flagData := strings.SplitN(f, "=", 2)
 		flag := strings.ToLower(strings.TrimSpace(flagData[0]))

dkim_test.go

@@ -360,5 +360,4 @@ func Test_Verify(t *testing.T) {
 	status, err = Verify(&email)
 	assert.NoError(t, err)
 	assert.Equal(t, SUCCESS, status)
-
 }