Remove unused readKey function

src/github.com/matrix-org/dendrite/common/readkey.go

@@ -1,58 +0,0 @@
-// Copyright 2017 Vector Creations Ltd
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package common
-
-import (
-	"bytes"
-	"encoding/base64"
-	"fmt"
-	"github.com/matrix-org/gomatrixserverlib"
-	"golang.org/x/crypto/ed25519"
-	"io"
-	"strings"
-)
-
-// ReadKey reads a server's private ed25519 key.
-// If the key is the empty string then a random key is generated.
-// Otherwise the key is the key ID and the base64 encoded private key
-// separated by a single space character.
-// E.g "ed25519:abcd ABCDEFGHIJKLMNOPabcdefghijklmnop01234567890"
-func ReadKey(key string) (gomatrixserverlib.KeyID, ed25519.PrivateKey, error) {
-	var keyID gomatrixserverlib.KeyID
-	var seed io.Reader
-	if key == "" {
-		// TODO: We should fail if we don't have a private key rather than
-		// generating a throw away key.
-		keyID = gomatrixserverlib.KeyID("ed25519:something")
-	} else {
-		// TODO: We should be reading this from a PEM formatted file instead of
-		// reading from the environment directly.
-		parts := strings.SplitN(key, " ", 2)
-		keyID = gomatrixserverlib.KeyID(parts[0])
-		if len(parts) != 2 {
-			return "", nil, fmt.Errorf("Invalid server key: %q", key)
-		}
-		seedBytes, err := base64.RawStdEncoding.DecodeString(parts[1])
-		if err != nil {
-			return "", nil, err
-		}
-		seed = bytes.NewReader(seedBytes)
-	}
-	_, privKey, err := ed25519.GenerateKey(seed)
-	if err != nil {
-		return "", nil, err
-	}
-	return keyID, privKey, nil
-}