fix comments

poseidon/poseidon_wrapper.go

@@ -6,7 +6,7 @@ import (
 	"hash"
 )
 
-type digest struct {
+type hasher struct {
 	buf       *bytes.Buffer
 	frameSize int
 }
@@ -24,37 +24,37 @@ func New(frameSize int) (hash.Hash, error) {
 	if frameSize < 2 || frameSize > 16 {
 		return nil, errors.New("incorrect frame size")
 	}
-	return &digest{
+	return &hasher{
 		buf:       bytes.NewBuffer([]byte{}),
 		frameSize: frameSize,
 	}, nil
 }
 
 // Write (via the embedded io.Writer interface) adds more data to the running hash.
-func (d *digest) Write(p []byte) (n int, err error) {
-	return d.buf.Write(p)
+func (h *hasher) Write(p []byte) (n int, err error) {
+	return h.buf.Write(p)
 }
 
-// Sum returns the Poseidon checksum of the data.
-func (d *digest) Sum(b []byte) []byte {
-	hahs, err := HashBytesX(d.buf.Bytes(), d.frameSize)
+// Sum returns the Poseidon digest of the data.
+func (h *hasher) Sum(b []byte) []byte {
+	hahs, err := HashBytesX(h.buf.Bytes(), h.frameSize)
 	if err != nil {
 		panic(err)
 	}
 	return append(b, hahs.Bytes()...)
 }
 
 // Reset resets the Hash to its initial state.
-func (d *digest) Reset() {
-	d.buf.Reset()
+func (h *hasher) Reset() {
+	h.buf.Reset()
 }
 
 // Size returns the number of bytes Sum will return.
-func (d *digest) Size() int {
+func (h *hasher) Size() int {
 	return 32
 }
 
 // BlockSize returns the hash block size.
-func (d *digest) BlockSize() int {
+func (h *hasher) BlockSize() int {
 	return spongeChunkSize
 }