crypto: remove unused code (#8412)

crypto/tmhash/hash.go

@@ -2,19 +2,14 @@ package tmhash
 
 import (
 	"crypto/sha256"
-	"hash"
 )
 
 const (
-	Size      = sha256.Size
-	BlockSize = sha256.BlockSize
+	Size          = sha256.Size
+	BlockSize     = sha256.BlockSize
+	TruncatedSize = 20
 )
 
-// New returns a new hash.Hash.
-func New() hash.Hash {
-	return sha256.New()
-}
-
 // Sum returns the SHA256 of the bz.
 func Sum(bz []byte) []byte {
 	h := sha256.Sum256(bz)
@@ -23,41 +18,6 @@ func Sum(bz []byte) []byte {
 
 //-------------------------------------------------------------
 
-const (
-	TruncatedSize = 20
-)
-
-type sha256trunc struct {
-	sha256 hash.Hash
-}
-
-func (h sha256trunc) Write(p []byte) (n int, err error) {
-	return h.sha256.Write(p)
-}
-func (h sha256trunc) Sum(b []byte) []byte {
-	shasum := h.sha256.Sum(b)
-	return shasum[:TruncatedSize]
-}
-
-func (h sha256trunc) Reset() {
-	h.sha256.Reset()
-}
-
-func (h sha256trunc) Size() int {
-	return TruncatedSize
-}
-
-func (h sha256trunc) BlockSize() int {
-	return h.sha256.BlockSize()
-}
-
-// NewTruncated returns a new hash.Hash.
-func NewTruncated() hash.Hash {
-	return sha256trunc{
-		sha256: sha256.New(),
-	}
-}
-
 // SumTruncated returns the first 20 bytes of SHA256 of the bz.
 func SumTruncated(bz []byte) []byte {
 	hash := sha256.Sum256(bz)

crypto/tmhash/hash_test.go

@@ -1,48 +0,0 @@
-package tmhash_test
-
-import (
-	"crypto/sha256"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-
-	"github.com/tendermint/tendermint/crypto/tmhash"
-)
-
-func TestHash(t *testing.T) {
-	testVector := []byte("abc")
-	hasher := tmhash.New()
-	_, err := hasher.Write(testVector)
-	require.NoError(t, err)
-	bz := hasher.Sum(nil)
-
-	bz2 := tmhash.Sum(testVector)
-
-	hasher = sha256.New()
-	_, err = hasher.Write(testVector)
-	require.NoError(t, err)
-	bz3 := hasher.Sum(nil)
-
-	assert.Equal(t, bz, bz2)
-	assert.Equal(t, bz, bz3)
-}
-
-func TestHashTruncated(t *testing.T) {
-	testVector := []byte("abc")
-	hasher := tmhash.NewTruncated()
-	_, err := hasher.Write(testVector)
-	require.NoError(t, err)
-	bz := hasher.Sum(nil)
-
-	bz2 := tmhash.SumTruncated(testVector)
-
-	hasher = sha256.New()
-	_, err = hasher.Write(testVector)
-	require.NoError(t, err)
-	bz3 := hasher.Sum(nil)
-	bz3 = bz3[:tmhash.TruncatedSize]
-
-	assert.Equal(t, bz, bz2)
-	assert.Equal(t, bz, bz3)
-}