使用特权模式，开启use_encryption，frps产生错误退出

[Hirozy]

服务器端开启特权模式

# frps.ini
[common]
bind_addr = 0.0.0.0
bind_port = 7500
vhost_http_port = 801
vhost_https_port = 443
dashboard_port = 7000
log_file = ./frps.log
log_level = info
log_max_days = 3
privilege_token is correct
privilege_mode = true
privilege_token = oxcm!Jkn/jQ(S?of
privilege_allow_ports = 2000-3000,3001,3003,4000-50000
max_pool_count = 100

客户端

# frpc.ini
[privilege_web1]
privilege_mode = true
type = http
local_ip = 127.0.0.1
local_port = 30000
use_gzip = true
use_encryption = true
custom_domains = xx.xxxx.xx

之后打开xx.xxxx.xx:801，frps就会自动退出，并且报错，错误内容如下

➜  frp ./frps -c frps.ini
panic: cipher.NewCBCEncrypter: IV length must equal block size

goroutine 25 [running]:
panic(0x794c80, 0xc82016b6a0)
        /usr/lib/golang/src/runtime/panic.go:481 +0x3e6
crypto/cipher.NewCBCEncrypter(0x7f9ca8a6dcf0, 0xc8201757d0, 0xc820308760, 0x20, 0x20, 0x0, 0x0)
        /usr/lib/golang/src/crypto/cipher/cbc.go:37 +0xa8
github.com/fatedier/frp/src/utils/pcrypto.(*Pcrypto).Encrypt(0xc820341eb8, 0xc820114380, 0x170, 0x1c0, 0x0, 0x0, 0x0, 0x0, 0x0)
        /home/wcl/go_projects/src/github.com/fatedier/frp/src/utils/pcrypto/pcrypto.go:44 +0xd5
github.com/fatedier/frp/src/models/msg.pipeEncrypt(0xc82032e080, 0xc82032e240, 0xc82016b370, 0xe, 0x0, 0x0, 0xc82016b35c, 0x4, 0x10101, 0xc820174162, ...)
        /home/wcl/go_projects/src/github.com/fatedier/frp/src/models/msg/process.go:242 +0x92c
github.com/fatedier/frp/src/models/msg.JoinMore.func1(0xc82032e080, 0xc82032e240)
        /home/wcl/go_projects/src/github.com/fatedier/frp/src/models/msg/process.go:64 +0x104
created by github.com/fatedier/frp/src/models/msg.JoinMore
        /home/wcl/go_projects/src/github.com/fatedier/frp/src/models/msg/process.go:80 +0x1ca

[JimLee1996]

没有填特权密码，或者端口选用不当吧

[Hirozy]

已经设置特权密码，端口选取没有问题
PS：use_encryption = false时正常

[fatedier]

已经确认这是一个 bug，你可以暂时将 privilege_token 改为一个小于 16 字节的字符串，后续会修复这个问题。