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package hook
import (
"crypto/aes"
"crypto/cipher"
"crypto/md5"
"crypto/rand"
"io"
"tunnel/pkg/server/env"
"tunnel/pkg/server/opts"
"tunnel/pkg/server/queue"
)
type aesHook struct{}
type aesPipe struct {
key []byte
}
func (a *aesPipe) Send(rq, wq queue.Q) error {
block, err := aes.NewCipher(a.key)
if err != nil {
return err
}
iv := make([]byte, aes.BlockSize)
if _, err := rand.Read(iv); err != nil {
return err
}
writer := &cipher.StreamWriter{
S: cipher.NewOFB(block, iv),
W: wq.Writer(),
}
wq <- iv
return queue.IoCopy(rq.Reader(), writer)
}
func (a *aesPipe) Recv(rq, wq queue.Q) error {
block, err := aes.NewCipher(a.key)
if err != nil {
return err
}
r := rq.Reader()
iv := make([]byte, aes.BlockSize)
if _, err := io.ReadFull(r, iv); err != nil {
if err == io.EOF {
return nil
}
return err
}
reader := &cipher.StreamReader{
S: cipher.NewOFB(block, iv),
R: r,
}
return queue.IoCopy(reader, wq.Writer())
}
func newAes(env env.Env) *aesPipe {
s := getHookVar(env, "secret")
h := md5.Sum([]byte(s))
a := &aesPipe{key: make([]byte, 16)}
copy(a.key, h[:])
return a
}
func (aesHook) Open(env env.Env) (interface{}, error) {
return newAes(env), nil
}
func newAesHook(opts.Opts, env.Env) (hook, error) {
return aesHook{}, nil
}
func init() {
register("aes", newAesHook)
}
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