mirror of https://gitee.com/IrisVega/frp.git
76 lines
1.6 KiB
Go
76 lines
1.6 KiB
Go
// Copyright 2017 fatedier, fatedier@gmail.com
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package crypto
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/sha1"
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"io"
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"golang.org/x/crypto/pbkdf2"
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)
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// NewReader returns a new Reader that decrypts bytes from r
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func NewReader(r io.Reader, key []byte) *Reader {
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key = pbkdf2.Key(key, []byte(salt), 64, aes.BlockSize, sha1.New)
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return &Reader{
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r: r,
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key: key,
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}
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}
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// Reader is an io.Reader that can read encrypted bytes.
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// Now it only supports aes-128-cfb.
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type Reader struct {
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r io.Reader
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dec *cipher.StreamReader
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key []byte
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iv []byte
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err error
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}
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// Read satisfies the io.Reader interface.
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func (r *Reader) Read(p []byte) (nRet int, errRet error) {
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if r.err != nil {
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return 0, r.err
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}
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if r.dec == nil {
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iv := make([]byte, aes.BlockSize)
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if _, errRet = io.ReadFull(r.r, iv); errRet != nil {
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return
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}
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r.iv = iv
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block, err := aes.NewCipher(r.key)
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if err != nil {
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errRet = err
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return
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}
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r.dec = &cipher.StreamReader{
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S: cipher.NewCFBDecrypter(block, iv),
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R: r.r,
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}
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}
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nRet, errRet = r.dec.Read(p)
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if errRet != nil {
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r.err = errRet
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}
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return
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}
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