diff --git a/crtutil/key.go b/crtutil/key.go
index 5540fa5..9425d52 100644
--- a/crtutil/key.go
+++ b/crtutil/key.go
@@ -11,29 +11,47 @@ import (
 )
 
 // ParseKeyFile parses an unencrypted crypto.PrivateKey from the given file.
+// Deprecated: use ReadFileAsSigner instead.
 func ParseKeyFile(fpath string) (crypto.PrivateKey, error) {
+	return ReadFileAsSigner(fpath)
+}
+
+// ReadFileAsSigner read a crypto.PrivateKey from the given file.
+func ReadFileAsSigner(fpath string) (crypto.PrivateKey, error) {
 	f, err := ioutil.ReadFile(fpath)
 	if err != nil {
 		return nil, err
 	}
-	return ParseKeyBytes(f, false)
+	return ReadBytesAsSigner(f, false)
 }
 
-// ParseKeyFileWithPass parses an unencrypted crypto.PrivateKey from the given file.
+// ParseKeyFileWithPass read a crypto.PrivateKey from the given file.
+// Deprecated: use ReadFileAsSignerWithPass instead.
 func ParseKeyFileWithPass(keyPath, keyPass string) (crypto.PrivateKey, error) {
+	return ReadFileAsSignerWithPass(keyPath, keyPass)
+}
+
+// ReadFileAsSignerWithPass read a crypto.PrivateKey from the given file.
+func ReadFileAsSignerWithPass(keyPath, keyPass string) (crypto.PrivateKey, error) {
 	f, err := ioutil.ReadFile(keyPath)
 	if err != nil {
 		return nil, err
 	}
-	return parseKeyBytes(f, []byte(keyPass), false)
+	return readBytesAsSigner(f, []byte(keyPass), false)
 }
 
-// ParseKeyBytes parses an unencrypted crypto.PrivateKey from the given data.
+// ParseKeyBytes read a crypto.PrivateKey from the given data.
+// Deprecated: use ReadBytesAsSigner instead.
 func ParseKeyBytes(data []byte, isBase64 bool) (crypto.PrivateKey, error) {
-	return parseKeyBytes(data, nil, isBase64)
+	return readBytesAsSigner(data, nil, isBase64)
+}
+
+// ReadBytesAsSigner read a crypto.PrivateKey from the given data.
+func ReadBytesAsSigner(data []byte, isBase64 bool) (crypto.PrivateKey, error) {
+	return readBytesAsSigner(data, nil, isBase64)
 }
 
-func parseKeyBytes(key, keypass []byte, isBase64 bool) (crypto.PrivateKey, error) {
+func readBytesAsSigner(key, keypass []byte, isBase64 bool) (crypto.PrivateKey, error) {
 	var err error
 	dkeystr := key
 
diff --git a/crtutil/key_test.go b/crtutil/key_test.go
index 7448503..24788f6 100644
--- a/crtutil/key_test.go
+++ b/crtutil/key_test.go
@@ -9,7 +9,7 @@ import (
 )
 
 func TestParseKeyFile(t *testing.T) {
-	prik, err := ParseKeyFile("testdata/server-rsa.key")
+	prik, err := ReadFileAsSigner("testdata/server-rsa.key")
 	assert.NoError(t, err)
 
 	_, ok := prik.(*rsa.PrivateKey)
@@ -17,7 +17,7 @@ func TestParseKeyFile(t *testing.T) {
 }
 
 func TestParseKeyFileWithPass(t *testing.T) {
-	prik, err := ParseKeyFileWithPass("testdata/server-rsa.key", "")
+	prik, err := ReadFileAsSignerWithPass("testdata/server-rsa.key", "")
 	assert.NoError(t, err)
 
 	_, ok := prik.(*rsa.PrivateKey)
@@ -28,7 +28,7 @@ func TestParseKeyBytes(t *testing.T) {
 	f, err := ioutil.ReadFile("testdata/server-rsa-base64.key")
 	assert.NoError(t, err)
 
-	prik, err := ParseKeyBytes(f, true)
+	prik, err := ReadBytesAsSigner(f, true)
 	assert.NoError(t, err)
 
 	_, ok := prik.(*rsa.PrivateKey)