diff --git a/common/byteslice.go b/common/byteslice.go
index e1e0dc6b9..ebc9ae38a 100644
--- a/common/byteslice.go
+++ b/common/byteslice.go
@@ -1,7 +1,25 @@
 package common
 
-func Fingerprint(bytez []byte) []byte {
+func Fingerprint(slice []byte) []byte {
 	fingerprint := make([]byte, 6)
-	copy(fingerprint, bytez)
+	copy(fingerprint, slice)
 	return fingerprint
 }
+
+func RightPadBytes(slice []byte, l int) []byte {
+	if l < len(slice) {
+		return slice
+	}
+	padded := make([]byte, l)
+	copy(padded[0:len(slice)], slice)
+	return padded
+}
+
+func LeftPadBytes(slice []byte, l int) []byte {
+	if l < len(slice) {
+		return slice
+	}
+	padded := make([]byte, l)
+	copy(padded[l-len(slice):], slice)
+	return padded
+}
diff --git a/common/math.go b/common/math.go
index cc9c31ade..b037d1a71 100644
--- a/common/math.go
+++ b/common/math.go
@@ -42,6 +42,20 @@ func MaxUint32(a, b uint32) uint32 {
 	return b
 }
 
+func MaxInt64(a, b int64) int64 {
+	if a > b {
+		return a
+	}
+	return b
+}
+
+func MaxUint64(a, b uint64) uint64 {
+	if a > b {
+		return a
+	}
+	return b
+}
+
 func MaxInt(a, b int) int {
 	if a > b {
 		return a
@@ -100,6 +114,20 @@ func MinUint32(a, b uint32) uint32 {
 	return b
 }
 
+func MinInt64(a, b int64) int64 {
+	if a < b {
+		return a
+	}
+	return b
+}
+
+func MinUint64(a, b uint64) uint64 {
+	if a < b {
+		return a
+	}
+	return b
+}
+
 func MinInt(a, b int) int {
 	if a < b {
 		return a
@@ -113,3 +141,17 @@ func MinUint(a, b uint) uint {
 	}
 	return b
 }
+
+//-----------------------------------------------------------------------------
+
+func ExpUint64(a, b uint64) uint64 {
+	accum := uint64(1)
+	for b > 0 {
+		if b&1 == 1 {
+			accum *= a
+		}
+		a *= a
+		b >>= 1
+	}
+	return accum
+}