Small tweaks to mnemonic

ethutil/mnemonic.go

@@ -5,6 +5,60 @@ import (
 	"strconv"
 )
 
+// TODO: See if we can refactor this into a shared util lib if we need it multiple times
+func IndexOf(slice []string, value string) int64 {
+	for p, v := range slice {
+		if v == value {
+			return int64(p)
+		}
+	}
+	return -1
+}
+
+func MnemonicEncode(message string) []string {
+	var out []string
+	n := int64(len(words))
+
+	for i := 0; i < len(message); i += (len(message) / 8) {
+		x := message[i : i+8]
+		bit, _ := strconv.ParseInt(x, 16, 64)
+		w1 := (bit % n)
+		w2 := ((bit / n) + w1) % n
+		w3 := ((bit / n / n) + w2) % n
+		out = append(out, words[w1], words[w2], words[w3])
+	}
+	return out
+}
+
+func MnemonicDecode(wordsar []string) string {
+	var out string
+	n := int64(len(words))
+
+	for i := 0; i < len(wordsar); i += 3 {
+		word1 := wordsar[i]
+		word2 := wordsar[i+1]
+		word3 := wordsar[i+2]
+		w1 := IndexOf(words, word1)
+		w2 := IndexOf(words, word2)
+		w3 := IndexOf(words, word3)
+
+		y := (w2 - w1) % n
+		z := (w3 - w2) % n
+
+		// Golang handles modulo with negative numbers different then most languages
+		// The modulo can be negative, we don't want that.
+		if z < 0 {
+			z += n
+		}
+		if y < 0 {
+			y += n
+		}
+		x := w1 + n*(y) + n*n*(z)
+		out += fmt.Sprintf("%08x", x)
+	}
+	return out
+}
+
 // Electrum word list
 var words []string = []string{
 	"like",
@@ -1634,55 +1688,3 @@ var words []string = []string{
 	"weapon",
 	"weary",
 }
-
-var n int64 = 1626
-
-func IndexOf(slice []string, value string) int64 {
-	for p, v := range slice {
-		if v == value {
-			return int64(p)
-		}
-	}
-	return -1
-}
-
-func MnemonicEncode(message string) []string {
-	var out []string
-
-	for i := 0; i < len(message); i += (len(message) / 8) {
-		x := message[i : i+8]
-		bit, _ := strconv.ParseInt(x, 16, 64)
-		w1 := (bit % n)
-		w2 := ((bit / n) + w1) % n
-		w3 := ((bit / n / n) + w2) % n
-		out = append(out, words[w1], words[w2], words[w3])
-	}
-	return out
-}
-
-func MnemonicDecode(wordsar []string) string {
-	var out string
-	for i := 0; i < len(wordsar); i += 3 {
-		word1 := wordsar[i]
-		word2 := wordsar[i+1]
-		word3 := wordsar[i+2]
-		w1 := IndexOf(words, word1)
-		w2 := IndexOf(words, word2)
-		w3 := IndexOf(words, word3)
-
-		y := (w2 - w1) % n
-		z := (w3 - w2) % n
-
-		// Golang handles modulo with negative numbers different then most languages
-		// The modulo can be negative, we don't want that.
-		if z < 0 {
-			z += n
-		}
-		if y < 0 {
-			y += n
-		}
-		x := w1 + n*(y) + n*n*(z)
-		out += fmt.Sprintf("%08x", x)
-	}
-	return out
-}