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240 lines
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<div class="header">
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javax.crypto.spec
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<h2 class="title" title="Class GCMParameterSpec">Class GCMParameterSpec</h2>
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<ul class="inheritance">
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<li><a href="../../../java/lang/Object.html" title="class in java.lang">java.lang.Object</a></li>
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<li>
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<ul class="inheritance">
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<li>javax.crypto.spec.GCMParameterSpec</li>
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</ul> </li>
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<div class="description">
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<dl>
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<dt>
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All Implemented Interfaces:
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</dt>
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<dd>
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<span><a href="../../../java/security/spec/AlgorithmParameterSpec.html" title="java.security.spec中的接口">AlgorithmParameterSpec</a></span>
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</dd>
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</dl>
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<hr/> <br/> <pre>public class <span class="typeNameLabel">GCMParameterSpec</span>
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extends <a href="../../../java/lang/Object.html" title="class in java.lang">Object</a>
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implements <a href="../../../java/security/spec/AlgorithmParameterSpec.html" title="interface in java.security.spec">AlgorithmParameterSpec</a></pre>
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<div class="block">
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<span>指定该组由所需的参数<a href="../../../javax/crypto/Cipher.html" title="javax.crypto中的类"><code>Cipher</code></a>使用伽罗瓦/计数器模式（GCM）模式。</span>
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<p> <span>简单的块密码模式（如CBC）通常仅需要初始化向量（如<code>IvParameterSpec</code> ），但是GCM需要这些参数：</span> </p>
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<ul>
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<li> <span><code>IV</code> ：初始化向量（IV）</span> </li>
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<li> <span><code>tLen</code> ：认证标签T的长度（以比特为单位）</span> </li>
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</ul>
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<p> <span>除了这里描述的参数之外，其他GCM输入/输出（附加认证数据（AAD），密钥，分组密码，简单/密文和认证标签）都在<code>Cipher</code>类中处理。</span> </p>
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<p> <span>有关具有关联数据（AEAD）算法的认证加密的更多信息，以及<a href="http://csrc.nist.gov/publications/nistpubs/800-38D/SP-800-38D.pdf">NIST Special Publication 800-38D</a> “NIST推荐用于块密码操作模式：伽罗瓦/计数器模式（GCM）和GMAC”的信息，请参见<a href="http://www.ietf.org/rfc/rfc5116.txt">RFC 5116</a> 。</span> </p>
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<p> <span>GCM规范指出，对于<code>tLen</code>应用程序， <code>tLen</code>可能只有值{ <code>tLen</code> }或{64,32}。</span> <span>可以为此类指定其他值，但并不是所有的CSP实现都将支持它们。</span> </p>
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</div>
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<dl>
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<dt>
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<span class="simpleTagLabel">从以下版本开始：</span>
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</dt>
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<dd>
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1.7
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</dd>
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<dt>
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<span class="seeLabel">另请参见：</span>
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</dt>
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<dd>
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<span><a href="../../../javax/crypto/Cipher.html" title="javax.crypto中的类"><code>Cipher</code></a></span>
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</dd>
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</dl> </li>
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</ul>
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</div>
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<div class="summary">
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<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<ul class="blockList">
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<li class="blockList"><a name="constructor.summary">
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<!-- --> </a> <h3>构造方法摘要</h3>
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<table border="0" cellpadding="3" cellspacing="0" class="memberSummary" summary="Constructor Summary table, listing constructors, and an explanation">
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<caption>
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<span>构造方法</span>
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<span class="tabEnd"> </span>
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</caption>
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<tbody>
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<tr>
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<th class="colOne" scope="col">Constructor and Description</th>
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<tr class="altColor">
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../javax/crypto/spec/GCMParameterSpec.html#GCMParameterSpec-int-byte:A-">GCMParameterSpec</a></span>(int tLen, byte[] src)</code>
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<div class="block">
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使用指定的认证标签位长度和IV缓冲区构造GCMParameterSpec。
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</div> </td>
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</tr>
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<tr class="rowColor">
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../javax/crypto/spec/GCMParameterSpec.html#GCMParameterSpec-int-byte:A-int-int-">GCMParameterSpec</a></span>(int tLen, byte[] src, int offset, int len)</code>
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<div class="block">
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使用指定的身份验证标记位长度和指定缓冲区的子集作为IV构造一个GCMParameterSpec对象。
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</div> </td>
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</tr>
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</tbody>
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</table> </li>
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</ul>
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<!-- ========== METHOD SUMMARY =========== -->
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<li class="blockList"><a name="method.summary">
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<!-- --> </a> <h3>方法摘要</h3>
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<table border="0" cellpadding="3" cellspacing="0" class="memberSummary" summary="Method Summary table, listing methods, and an explanation">
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<caption>
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<span class="activeTableTab" id="t0"><span>所有方法</span><span class="tabEnd"> </span></span>
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<span class="tableTab" id="t2"><span><a href="javascript:show(2);">接口方法</a></span><span class="tabEnd"> </span></span>
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<span class="tableTab" id="t4"><span><a href="javascript:show(8);">具体的方法</a></span><span class="tabEnd"> </span></span>
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</caption>
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<tbody>
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<tr>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Method and Description</th>
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</tr>
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<tr class="altColor" id="i0">
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<td class="colFirst"><code>byte[]</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/crypto/spec/GCMParameterSpec.html#getIV--">getIV</a></span>()</code>
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<div class="block">
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返回初始化向量（IV）。
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</div> </td>
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</tr>
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<tr class="rowColor" id="i1">
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<td class="colFirst"><code>int</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/crypto/spec/GCMParameterSpec.html#getTLen--">getTLen</a></span>()</code>
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<div class="block">
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返回认证标签长度。
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</div> </td>
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</tr>
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<ul class="blockList">
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<li class="blockList"><a name="methods.inherited.from.class.java.lang.Object">
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<!-- --> </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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</ul> </li>
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</ul>
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</div>
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<div class="details">
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<!-- ========= CONSTRUCTOR DETAIL ======== -->
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<!-- --> </a> <h3>构造方法详细信息</h3> <a name="GCMParameterSpec-int-byte:A-">
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<ul class="blockList">
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<li class="blockList"> <h4>GCMParameterSpec</h4> <pre>public GCMParameterSpec(int tLen,
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byte[] src)</pre>
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<div class="block">
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使用指定的认证标签位长度和IV缓冲区构造GCMParameterSpec。
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</div>
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<dl>
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<dt>
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<span class="paramLabel">参数</span>
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</dt>
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<dd>
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<code>tLen</code> - 认证标签长度（以位为单位）
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</dd>
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<dd>
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<span><code>src</code> - IV源缓冲区。</span>
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<span>复制缓冲区的内容以防止后续修改。</span>
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</dd>
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<dt>
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<span class="throwsLabel">异常</span>
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</dt>
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<dd>
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<code><a href="../../../java/lang/IllegalArgumentException.html" title="class in java.lang">IllegalArgumentException</a></code> - 如果
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<code>tLen</code>为负数，或
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<code>src</code>为空。
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</dd>
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</dl> </li>
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</ul> <a name="GCMParameterSpec-int-byte:A-int-int-">
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<ul class="blockListLast">
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<li class="blockList"> <h4>GCMParameterSpec</h4> <pre>public GCMParameterSpec(int tLen,
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byte[] src,
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int offset,
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int len)</pre>
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<div class="block">
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使用指定的身份验证标记位长度和指定缓冲区的子集作为IV构造一个GCMParameterSpec对象。
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</div>
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<dl>
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<dt>
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<span class="paramLabel">参数</span>
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</dt>
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<dd>
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<code>tLen</code> - 认证标签长度（以位为单位）
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</dd>
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<dd>
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<span><code>src</code> - IV源缓冲区。</span>
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<span>复制缓冲区的内容以防止后续修改。</span>
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</dd>
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<dd>
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<code>offset</code> - 偏移在
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<code>src</code>其中IV开始
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</dd>
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<dd>
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<code>len</code> - IV字节数
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</dd>
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<dt>
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<span class="throwsLabel">异常</span>
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</dt>
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<dd>
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<code><a href="../../../java/lang/IllegalArgumentException.html" title="class in java.lang">IllegalArgumentException</a></code> - 如果
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<code>tLen</code>为负，则
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<code>src</code>为空，
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<code>len</code>或
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<code>offset</code>为否定，或
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<code>offset</code>和
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<code>len</code>的总和大于
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<code>src</code>字节数组的长度。
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</dd>
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</dl> </li>
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<!-- ============ METHOD DETAIL ========== -->
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<li class="blockList"> <h4>getTLen</h4> <pre>public int getTLen()</pre>
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<div class="block">
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返回认证标签长度。
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</div>
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<dl>
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<dt>
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<span class="returnLabel">结果</span>
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</dt>
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<dd>
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认证标签长度（以位为单位）
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</dd>
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</dl> </li>
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</ul> <a name="getIV--">
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<li class="blockList"> <h4>getIV</h4> <pre>public byte[] getIV()</pre>
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返回初始化向量（IV）。
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</div>
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<dl>
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<dt>
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<span class="returnLabel">结果</span>
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</dt>
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<dd>
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<span>四。</span>
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<span>每次调用此方法时都会创建一个新数组。</span>
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</dd>
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</dl> </li>
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