mirror of https://github.com/fatedier/frp
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
90 lines
1.9 KiB
90 lines
1.9 KiB
// Copyright 2017 fatedier, fatedier@gmail.com
|
|
//
|
|
// 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 crypto
|
|
|
|
import (
|
|
"crypto/aes"
|
|
"crypto/cipher"
|
|
"crypto/rand"
|
|
"crypto/sha1"
|
|
"io"
|
|
|
|
"golang.org/x/crypto/pbkdf2"
|
|
)
|
|
|
|
const (
|
|
salt = "frp"
|
|
)
|
|
|
|
// NewWriter returns a new Writer that encrypts bytes to w.
|
|
func NewWriter(w io.Writer, key []byte) (*Writer, error) {
|
|
key = pbkdf2.Key(key, []byte(salt), 64, aes.BlockSize, sha1.New)
|
|
|
|
// random iv
|
|
iv := make([]byte, aes.BlockSize)
|
|
if _, err := io.ReadFull(rand.Reader, iv); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
block, err := aes.NewCipher(key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &Writer{
|
|
w: w,
|
|
enc: &cipher.StreamWriter{
|
|
S: cipher.NewCFBEncrypter(block, iv),
|
|
W: w,
|
|
},
|
|
key: key,
|
|
iv: iv,
|
|
}, nil
|
|
}
|
|
|
|
// Writer is an io.Writer that can write encrypted bytes.
|
|
// Now it only support aes-128-cfb.
|
|
type Writer struct {
|
|
w io.Writer
|
|
enc *cipher.StreamWriter
|
|
key []byte
|
|
iv []byte
|
|
ivSend bool
|
|
err error
|
|
}
|
|
|
|
// Write satisfies the io.Writer interface.
|
|
func (w *Writer) Write(p []byte) (nRet int, errRet error) {
|
|
if w.err != nil {
|
|
return 0, w.err
|
|
}
|
|
|
|
// When write is first called, iv will be written to w.w
|
|
if !w.ivSend {
|
|
w.ivSend = true
|
|
_, errRet = w.w.Write(w.iv)
|
|
if errRet != nil {
|
|
w.err = errRet
|
|
return
|
|
}
|
|
}
|
|
|
|
nRet, errRet = w.enc.Write(p)
|
|
if errRet != nil {
|
|
w.err = errRet
|
|
}
|
|
return
|
|
}
|