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crypto_rc4.htm
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<!DOCTYPE html>
<html lang="en">
<head profile="http://a9.com/-/spec/opensearch/1.1/">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="../assets/site.css" rel="stylesheet">
<title>crypto/rc4</title>
</head>
<body>
<div class="container">
<h2 id="pkg-overview">package rc4</h2>
<p><code>import "crypto/rc4"</code>
<p>rc4包实现了RC4加密算法，参见Bruce Schneier's Applied Cryptography。</p>
<h3 id="pkg-index" class="section-header">Index <a class="permalink" href="#pkg-index">¶</a></h3>
<a href="../main.html"><h3>返回首页</h3></a>
</br>
<li><a href="#KeySizeError">type KeySizeError</a></li>
<ul>
<li><a href="#KeySizeError.Error">func (k KeySizeError) Error() string</a></li>
</ul>
<li><a href="#Cipher">type Cipher</a></li>
<ul>
<li><a href="#NewCipher">func NewCipher(key []byte) (*Cipher, error)</a></li>
<li><a href="#Cipher.Reset">func (c *Cipher) Reset()</a></li>
<li><a href="#Cipher.XORKeyStream">func (c *Cipher) XORKeyStream(dst, src []byte)</a></li>
</ul>
</ul>
<h3 id="KeySizeError">type <a title="View Source" href="https://github.com/golang/go/blob/master/src/crypto/rc4/rc4.go?name=release#20">KeySizeError</a> <a class="permalink" href="#pkg-index">¶</a></h3>
<pre>type KeySizeError <a href="builtin.htm#int">int</a></pre>
<h4 id="KeySizeError.Error">func (KeySizeError) <a title="View Source" href="https://github.com/golang/go/blob/master/src/crypto/rc4/rc4.go?name=release#22">Error</a> <a class="permalink" href="#pkg-index">¶</a></h4>
<pre class="funcdecl">func (k <a href="#KeySizeError">KeySizeError</a>) Error() <a href="builtin.htm#string">string</a></pre>
<h3 id="Cipher">type <a title="View Source" href="https://github.com/golang/go/blob/master/src/crypto/rc4/rc4.go?name=release#15">Cipher</a> <a class="permalink" href="#pkg-index">¶</a></h3>
<pre>type Cipher struct {
<span class="com">// 内含隐藏或非导出字段</span>
}</pre>
<p>Cipher是一个使用特定密钥的RC4实例，本类型实现了cipher.Stream接口。</p>
<h4 id="NewCipher">func <a title="View Source" href="https://github.com/golang/go/blob/master/src/crypto/rc4/rc4.go?name=release#28">NewCipher</a> <a class="permalink" href="#pkg-index">¶</a></h4>
<pre class="funcdecl">func NewCipher(key []<a href="builtin.htm#byte">byte</a>) (*<a href="#Cipher">Cipher</a>, <a href="builtin.htm#error">error</a>)</pre>
<p>NewCipher创建并返回一个新的Cipher。参数key是RC4密钥，至少1字节，最多256字节。</p>
<h4 id="Cipher.Reset">func (*Cipher) <a title="View Source" href="https://github.com/golang/go/blob/master/src/crypto/rc4/rc4.go?name=release#47">Reset</a> <a class="permalink" href="#pkg-index">¶</a></h4>
<pre class="funcdecl">func (c *<a href="#Cipher">Cipher</a>) Reset()</pre>
<p>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）</p>
<h4 id="Cipher.XORKeyStream">func (*Cipher) <a title="View Source" href="https://github.com/golang/go/blob/master/src/crypto/rc4/rc4_asm.go?name=release#13">XORKeyStream</a> <a class="permalink" href="#pkg-index">¶</a></h4>
<pre class="funcdecl">func (c *<a href="#Cipher">Cipher</a>) XORKeyStream(dst, src []<a href="builtin.htm#byte">byte</a>)</pre>
<p>XORKeyStream方法将src的数据与秘钥生成的伪随机位流取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。</p>
<h3 id="pkg-note-bug">Bugs <a class="permalink" href="#pkg-index">¶</a></h3>
<p><a title="View Source" href="https://github.com/golang/go/blob/master/src/crypto/rc4/rc4.go?name=release#9">☞</a> 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。 </div>
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