# package rc4
`import "crypto/rc4"`
rc4包實現了RC4加密算法,參見Bruce Schneier's Applied Cryptography。
## Index
* [type KeySizeError](#KeySizeError)
* [func (k KeySizeError) Error() string](#KeySizeError.Error)
* [type Cipher](#Cipher)
* [func NewCipher(key []byte) (\*Cipher, error)](#NewCipher)
* [func (c \*Cipher) Reset()](#Cipher.Reset)
* [func (c \*Cipher) XORKeyStream(dst, src []byte)](#Cipher.XORKeyStream)
## type [KeySizeError](https://github.com/golang/go/blob/master/src/crypto/rc4/rc4.go#L20 "View Source")
```
type KeySizeError int
```
### func (KeySizeError) [Error](https://github.com/golang/go/blob/master/src/crypto/rc4/rc4.go#L22 "View Source")
```
func (k KeySizeError) Error() string
```
## type [Cipher](https://github.com/golang/go/blob/master/src/crypto/rc4/rc4.go#L15 "View Source")
```
type Cipher struct {
// 內含隱藏或非導出字段
}
```
Cipher是一個使用特定密鑰的RC4實例,本類型實現了cipher.Stream接口。
### func [NewCipher](https://github.com/golang/go/blob/master/src/crypto/rc4/rc4.go#L28 "View Source")
```
func NewCipher(key []byte) (*Cipher, error)
```
NewCipher創建并返回一個新的Cipher。參數key是RC4密鑰,至少1字節,最多256字節。
### func (\*Cipher) [Reset](https://github.com/golang/go/blob/master/src/crypto/rc4/rc4.go#L47 "View Source")
```
func (c *Cipher) Reset()
```
Reset方法會清空密鑰數據,以便將其數據從程序內存中清除(以免被破解)
### func (\*Cipher) [XORKeyStream](https://github.com/golang/go/blob/master/src/crypto/rc4/rc4_asm.go#L13 "View Source")
```
func (c *Cipher) XORKeyStream(dst, src []byte)
```
XORKeyStream方法將src的數據與秘鑰生成的偽隨機位流取XOR并寫入dst。dst和src可指向同一內存地址;但如果指向不同則其底層內存不可重疊。
## Bugs
[?](https://github.com/golang/go/blob/master/src/crypto/rc4/rc4.go#L9 "View Source") RC4被廣泛使用,但設計上的缺陷使它很少用于較新的協議中。
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