diff --git a/gf127/gf127.go b/gf127/gf127.go
index 414f795..fea6312 100644
--- a/gf127/gf127.go
+++ b/gf127/gf127.go
@@ -142,7 +142,7 @@ func Random() *GF127 {
 
 // String returns hex-encoded representation, starting with MSB.
 func (c *GF127) String() string {
-	buf := c.ByteArray()
+	buf := c.Bytes()
 	return hex.EncodeToString(buf[:])
 }
 
@@ -151,9 +151,9 @@ func (c *GF127) Equals(b *GF127) bool {
 	return c[0] == b[0] && c[1] == b[1]
 }
 
-// ByteArray represents element of GF(2^127) as byte array of length 16.
-func (c *GF127) ByteArray() []byte {
-	buf := make([]byte, 16)
+// Bytes represents element of GF(2^127) as byte array of length 16.
+func (c *GF127) Bytes() [16]byte {
+	var buf [16]byte
 	binary.BigEndian.PutUint64(buf[:8], c[1])
 	binary.BigEndian.PutUint64(buf[8:], c[0])
 	return buf
@@ -161,7 +161,7 @@ func (c *GF127) ByteArray() []byte {
 
 // MarshalBinary implements encoding.BinaryMarshaler.
 func (c *GF127) MarshalBinary() (data []byte, err error) {
-	buf := c.ByteArray()
+	buf := c.Bytes()
 	return buf[:], nil
 }
 
diff --git a/gf127/gf127x2.go b/gf127/gf127x2.go
index 12d5cef..c3c4dd4 100644
--- a/gf127/gf127x2.go
+++ b/gf127/gf127x2.go
@@ -37,14 +37,13 @@ func (a *GF127x2) Equal(b *GF127x2) bool {
 // String returns hex-encoded representation, starting with MSB.
 // Elements of pair are separated by comma.
 func (a *GF127x2) String() string {
-	b := a.ByteArray()
+	b := a.Bytes()
 	return hex.EncodeToString(b[:16]) + " , " + hex.EncodeToString(b[16:])
 }
 
-// ByteArray represents element of GF(2^127) as byte array of length 32.
-func (a *GF127x2) ByteArray() (buf []byte) {
-	buf = make([]byte, 32)
-	binary.BigEndian.PutUint64(buf, a[0][1])
+// Bytes represents element of GF(2^127) as byte array of length 32.
+func (a *GF127x2) Bytes() (buf [32]byte) {
+	binary.BigEndian.PutUint64(buf[:], a[0][1])
 	binary.BigEndian.PutUint64(buf[8:], a[0][0])
 	binary.BigEndian.PutUint64(buf[16:], a[1][1])
 	binary.BigEndian.PutUint64(buf[24:], a[1][0])
diff --git a/tz/digest.go b/tz/digest.go
index 7ba074d..e930386 100644
--- a/tz/digest.go
+++ b/tz/digest.go
@@ -40,21 +40,17 @@ func (d *digest) Sum(in []byte) []byte {
 	return append(in, h[:]...)
 }
 
-func (d *digest) checkSum() [Size]byte {
-	return d.byteArray()
-}
-
-func (d *digest) byteArray() (b [Size]byte) {
-	t := d.x[0].ByteArray()
+func (d *digest) checkSum() (b [Size]byte) {
+	t := d.x[0].Bytes()
 	copy(b[:], t[:])
 
-	t = d.x[2].ByteArray()
+	t = d.x[2].Bytes()
 	copy(b[16:], t[:])
 
-	t = d.x[1].ByteArray()
+	t = d.x[1].Bytes()
 	copy(b[32:], t[:])
 
-	t = d.x[3].ByteArray()
+	t = d.x[3].Bytes()
 	copy(b[48:], t[:])
 
 	return
diff --git a/tz/hash_test.go b/tz/hash_test.go
index 539b8f1..39fcfe6 100644
--- a/tz/hash_test.go
+++ b/tz/hash_test.go
@@ -160,7 +160,7 @@ func TestHomomorphism(t *testing.T) {
 	require.NoError(t, err)
 
 	c1.Mul(&c1, &c2)
-	require.Equal(t, h, c1.ByteArray())
+	require.Equal(t, h, c1.Bytes())
 }
 
 var testCasesConcat = []struct {
diff --git a/tz/sl2.go b/tz/sl2.go
index cc45281..7852eb1 100644
--- a/tz/sl2.go
+++ b/tz/sl2.go
@@ -19,7 +19,7 @@ var id = sl2{
 
 // MarshalBinary implements encoding.BinaryMarshaler.
 func (c *sl2) MarshalBinary() (data []byte, err error) {
-	s := c.ByteArray()
+	s := c.Bytes()
 	return s[:], nil
 }
 
@@ -159,17 +159,17 @@ func (c *sl2) String() string {
 		c[1][0].String() + c[1][1].String()
 }
 
-func (c *sl2) ByteArray() (b [Size]byte) {
-	t := c[0][0].ByteArray()
+func (c *sl2) Bytes() (b [Size]byte) {
+	t := c[0][0].Bytes()
 	copy(b[:], t[:])
 
-	t = c[0][1].ByteArray()
+	t = c[0][1].Bytes()
 	copy(b[16:], t[:])
 
-	t = c[1][0].ByteArray()
+	t = c[1][0].Bytes()
 	copy(b[32:], t[:])
 
-	t = c[1][1].ByteArray()
+	t = c[1][1].Bytes()
 	copy(b[48:], t[:])
 
 	return