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golang中crypto/rc4包
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rc4包实现了RC4加密算法，参见Bruce Schneier's Applied Cryptography。
type KeySizeError int
func (KeySizeError) Error() string
type Cipher struct{...}
func NewCipher(key []byte) (*Cipher, error)
NewCipher创建并返回一个新的Cipher。参数key时RC4密钥，至少1字节，最多256字节。
func (c *Cipher) Reset()
Reset方法会清空密钥数据，以便将其数据从程序内存中清除（以免被破解）
func (c *Cipher) XORKeyStream(dst, src []byte)
XORKeyStream方法将src的数据与密钥生成的伪随机流取XOR并写入dst。dst和src可指向同一内存地址；但如果指向不同则其底层内存不可重叠。
Bugs：RC4被广泛使用，但设计上的缺陷使它很少用于较新的协议中。
package main
import (
"crypto/rc4"
"fmt"
"log"
)
func main() {
c, err := rc4.NewCipher([]byte("dsadsad"))
if err != nil {
log.Fatalln(err)
}
src := []byte("asdsad")
dst := make([]byte, len(src))
c.XORKeyStream(dst, src)
fmt.Println(string(src), string(dst))
}
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