move a few functions from utils.go to srp.go

srp.go

@@ -67,6 +67,30 @@ func pad(v *big.Int) []byte {
 	return buf[i:]
 }
 
+func bigIntToBytes(v *big.Int) []byte {
+	buf := pad(v)
+	for i, _ := range buf {
+		if buf[i] != 0 {
+			return buf[i:]
+		}
+	}
+
+	return buf[:1] // 0
+}
+
+func bytesToBigInt(v []byte) (r *big.Int) {
+	m := new(big.Int)
+	m.SetInt64(256)
+	a := new(big.Int)
+	r = new(big.Int)
+	r.SetInt64(0)
+	for _, b := range v {
+		r = r.Mul(r, m)
+		r = r.Add(r, a.SetInt64(int64(b)))
+	}
+	return r
+}
+
 func getPrime() (prime *big.Int, g *big.Int, k *big.Int) {
 	prime = bigIntFromHexString("E67D2E994B2F900C3F41F08F5BB2627ED0D49EE1FE767A52EFCD565CD6E768812C3E1E9CE8F0A8BEA6CB13CD29DDEBF7A96D4A93B55D488DF099A15C89DCB0640738EB2CBDD9A8F7BAB561AB1B0DC1C6CDABF303264A08D1BCA932D1F1EE428B619D970F342ABA9A65793B8B2F041AE5364350C16F735F56ECBCA87BD57B29E7")
 	g = big.NewInt(2)

utils.go

@@ -118,30 +118,6 @@ func bigIntFromString(s string) *big.Int {
 	return ret
 }
 
-func bigIntToBytes(v *big.Int) []byte {
-	buf := pad(v)
-	for i, _ := range buf {
-		if buf[i] != 0 {
-			return buf[i:]
-		}
-	}
-
-	return buf[:1] // 0
-}
-
-func bytesToBigInt(v []byte) (r *big.Int) {
-	m := new(big.Int)
-	m.SetInt64(256)
-	a := new(big.Int)
-	r = new(big.Int)
-	r.SetInt64(0)
-	for _, b := range v {
-		r = r.Mul(r, m)
-		r = r.Add(r, a.SetInt64(int64(b)))
-	}
-	return r
-}
-
 func bigIntToSha1(n *big.Int) []byte {
 	sha1 := sha1.New()
 	sha1.Write(n.Bytes())