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<div class="header">
<div class="subTitle">
javax.crypto.spec
</div>
<h2 class="title" title="Class IvParameterSpec">Class IvParameterSpec</h2>
</div><div class="contentContainer">
<ul class="inheritance">
<li><a href="../../../java/lang/Object.html" title="class in java.lang">java.lang.Object</a></li>
<li>
<ul class="inheritance">
<li>javax.crypto.spec.IvParameterSpec</li>
</ul> </li>
</ul>
<div class="description">
<ul class="blockList">
<li class="blockList">
<dl>
<dt>
All Implemented Interfaces:
</dt>
<dd>
<span><a href="../../../java/security/spec/AlgorithmParameterSpec.html" title="java.security.spec中的接口">AlgorithmParameterSpec</a></span>
</dd>
</dl>
<hr/> <br/> <pre>public class <span class="typeNameLabel">IvParameterSpec</span>
extends <a href="../../../java/lang/Object.html" title="class in java.lang">Object</a>
implements <a href="../../../java/security/spec/AlgorithmParameterSpec.html" title="interface in java.security.spec">AlgorithmParameterSpec</a></pre>
<div class="block">
<span>该类指定<i>初始化向量</i> （IV）。</span>
<span>使用IV的实例是反馈模式中的密码，例如CBC模式下的DES和具有OAEP编码操作的RSA密码。</span>
</div>
<dl>
<dt>
<span class="simpleTagLabel">从以下版本开始：</span>
</dt>
<dd>
1.4
</dd>
</dl> </li>
</ul>
</div>
<div class="summary">
<ul class="blockList">
<li class="blockList">
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
<ul class="blockList">
<li class="blockList"><a name="constructor.summary">
<!-- --> </a> <h3>构造方法摘要</h3>
<table border="0" cellpadding="3" cellspacing="0" class="memberSummary" summary="Constructor Summary table, listing constructors, and an explanation">
<caption>
<span>构造方法</span>
<span class="tabEnd"> </span>
</caption>
<tbody>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../javax/crypto/spec/IvParameterSpec.html#IvParameterSpec-byte:A-">IvParameterSpec</a></span>(byte[] iv)</code>
<div class="block">
创建使用字节来构造一个IvParameterSpec对象
<code>iv</code>作为IV。
</div> </td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../javax/crypto/spec/IvParameterSpec.html#IvParameterSpec-byte:A-int-int-">IvParameterSpec</a></span>(byte[] iv, int offset, int len)</code>
<div class="block">
创建使用第一构造一个IvParameterSpec对象
<code>len</code>字节
<code>iv</code> ，在开始
<code>offset</code>以下，作为IV。
</div> </td>
</tr>
</tbody>
</table> </li>
</ul>
<!-- ========== METHOD SUMMARY =========== -->
<ul class="blockList">
<li class="blockList"><a name="method.summary">
<!-- --> </a> <h3>方法摘要</h3>
<table border="0" cellpadding="3" cellspacing="0" class="memberSummary" summary="Method Summary table, listing methods, and an explanation">
<caption>
<span class="activeTableTab" id="t0"><span>所有方法</span><span class="tabEnd"> </span></span>
<span class="tableTab" id="t2"><span><a href="javascript:show(2);">接口方法</a></span><span class="tabEnd"> </span></span>
<span class="tableTab" id="t4"><span><a href="javascript:show(8);">具体的方法</a></span><span class="tabEnd"> </span></span>
</caption>
<tbody>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor" id="i0">
<td class="colFirst"><code>byte[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/crypto/spec/IvParameterSpec.html#getIV--">getIV</a></span>()</code>
<div class="block">
返回初始化向量（IV）。
</div> </td>
</tr>
</tbody>
</table>
<ul class="blockList">
<li class="blockList"><a name="methods.inherited.from.class.java.lang.Object">
<!-- --> </a> <h3>Methods inherited from class java.lang.<a href="../../../java/lang/Object.html" title="class in java.lang">Object</a></h3> <code><a href="../../../java/lang/Object.html#clone--">clone</a>, <a href="../../../java/lang/Object.html#equals-java.lang.Object-">equals</a>, <a href="../../../java/lang/Object.html#finalize--">finalize</a>, <a href="../../../java/lang/Object.html#getClass--">getClass</a>, <a href="../../../java/lang/Object.html#hashCode--">hashCode</a>, <a href="../../../java/lang/Object.html#notify--">notify</a>, <a href="../../../java/lang/Object.html#notifyAll--">notifyAll</a>, <a href="../../../java/lang/Object.html#toString--">toString</a>, <a href="../../../java/lang/Object.html#wait--">wait</a>, <a href="../../../java/lang/Object.html#wait-long-">wait</a>, <a href="../../../java/lang/Object.html#wait-long-int-">wait</a></code></li>
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<div class="details">
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<li class="blockList"><a name="constructor.detail">
<!-- --> </a> <h3>构造方法详细信息</h3> <a name="IvParameterSpec-byte:A-">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>IvParameterSpec</h4> <pre>public IvParameterSpec(byte[] iv)</pre>
<div class="block">
创建使用字节来构造一个IvParameterSpec对象
<code>iv</code>作为IV。
</div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<span><code>iv</code> - 具有IV的缓冲区。</span>
<span>复制缓冲区的内容以防止后续修改。</span>
</dd>
<dt>
<span class="throwsLabel">异常</span>
</dt>
<dd>
<code><a href="../../../java/lang/NullPointerException.html" title="class in java.lang">NullPointerException</a></code> - 如果
<code>iv</code>是
<code>null</code>
</dd>
</dl> </li>
</ul> <a name="IvParameterSpec-byte:A-int-int-">
<!-- --> </a>
<ul class="blockListLast">
<li class="blockList"> <h4>IvParameterSpec</h4> <pre>public IvParameterSpec(byte[] iv,
int offset,
int len)</pre>
<div class="block">
<span>创建使用第一构造一个IvParameterSpec对象<code>len</code>字节<code>iv</code> ，在开始<code>offset</code>以下，作为IV。</span>
<p> <span>组成IV的字节在之间<code>iv[offset]</code>和<code>iv[offset+len-1]</code>以下。</span> </p>
</div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<span><code>iv</code> - 具有IV的缓冲区。</span>
<span>第一<code>len</code>字节在开始缓冲的<code>offset</code>包容被复制到防止后续修改。</span>
</dd>
<dd>
<code>offset</code> - 偏移在
<code>iv</code>哪里IV启动。
</dd>
<dd>
<code>len</code> - IV字节数。
</dd>
<dt>
<span class="throwsLabel">异常</span>
</dt>
<dd>
<code><a href="../../../java/lang/IllegalArgumentException.html" title="class in java.lang">IllegalArgumentException</a></code> - 如果
<code>iv</code>是
<code>null</code>或
<code>(iv.length - offset &lt; len)</code>
</dd>
<dd>
<code><a href="../../../java/lang/ArrayIndexOutOfBoundsException.html" title="class in java.lang">ArrayIndexOutOfBoundsException</a></code> - 抛出
<code>offset</code>或
<code>len</code>索引字节外的
<code>iv</code> 。
</dd>
</dl> </li>
</ul> </li>
</ul>
<!-- ============ METHOD DETAIL ========== -->
<ul class="blockList">
<li class="blockList"><a name="method.detail">
<!-- --> </a> <h3>方法详细信息</h3> <a name="getIV--">
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<li class="blockList"> <h4>getIV</h4> <pre>public byte[] getIV()</pre>
<div class="block">
返回初始化向量（IV）。
</div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
<span>初始化向量（IV）。</span>
<span>每次调用此方法时都会返回一个新数组。</span>
</dd>
</dl> </li>
</ul> </li>
</ul> </li>
</ul>
</div>
</div>
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