Sophie: php-manual-zh-5.2.4-1mdv2008.1 noarch

php-manual-zh-5.2.4-1mdv2008.1.noarch.rpm

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><A
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>加密过滤器</A
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><P
>&#13;   <TT
CLASS="literal"
>mcrypt.*</TT
> 和 <TT
CLASS="literal"
>mdecrypt.*</TT
>
   使用 libmcrypt 提供了对称的加密和解密。这两组过滤器都支持
   <A
HREF="ref.mcrypt.html"
>mcrypt 扩展库</A
>中相同的算法，格式为
   <TT
CLASS="literal"
>mcrypt.ciphername</TT
>，其中 <CODE
CLASS="parameter"
>ciphername</CODE
>
   是密码的名字，将被传递给 <A
HREF="function.mcrypt-module-open.html"
><B
CLASS="function"
>mcrypt_module_open()</B
></A
>。有以下五个过滤器参数可用：
  </P
><P
>&#13;   <DIV
CLASS="table"
><A
NAME="AEN303658"
></A
><P
><B
>表 O-1. mcrypt 过滤器参数</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><COL><COL><THEAD
><TR
><TH
>参数</TH
><TH
>是否必须</TH
><TH
>默认值</TH
><TH
>取值举例</TH
></TR
></THEAD
><TBODY
><TR
><TD
>mode</TD
><TD
>可选</TD
><TD
>cbc</TD
><TD
>cbc, cfb, ecb, nofb, ofb, stream</TD
></TR
><TR
><TD
>algorithms_dir</TD
><TD
>可选</TD
><TD
>ini_get('mcrypt.algorithms_dir')</TD
><TD
>algorithms 模块的目录</TD
></TR
><TR
><TD
>modes_dir</TD
><TD
>可选</TD
><TD
>ini_get('mcrypt.modes_dir')</TD
><TD
>modes 模块的目录</TD
></TR
><TR
><TD
>iv</TD
><TD
>必须</TD
><TD
>N/A</TD
><TD
>典型为 8，16 或 32 字节的二进制数据。根据密码而定</TD
></TR
><TR
><TD
>key</TD
><TD
>必须</TD
><TD
>N/A</TD
><TD
>典型为 8，16 或 32 字节的二进制数据。根据密码而定</TD
></TR
></TBODY
></TABLE
></DIV
>
  </P
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><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN303693"
></A
><P
><B
>例 O-10. 用 3DES 将文件加密输出</B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$passphrase </font><font color="#007700">= </font><font color="#DD0000">'My secret'</font><font color="#007700">;<br /><br /></font><font color="#FF8000">/* Turn a human readable passphrase<br /> * into a reproducable iv/key pair<br /> */<br /></font><font color="#0000BB">$iv </font><font color="#007700">= </font><font color="#0000BB">substr</font><font color="#007700">(</font><font color="#0000BB">md5</font><font color="#007700">(</font><font color="#DD0000">'iv'</font><font color="#007700">.</font><font color="#0000BB">$passphrase</font><font color="#007700">, </font><font color="#0000BB">true</font><font color="#007700">), </font><font color="#0000BB">0</font><font color="#007700">, </font><font color="#0000BB">8</font><font color="#007700">);<br /></font><font color="#0000BB">$key </font><font color="#007700">= </font><font color="#0000BB">substr</font><font color="#007700">(</font><font color="#0000BB">md5</font><font color="#007700">(</font><font color="#DD0000">'pass1'</font><font color="#007700">.</font><font color="#0000BB">$passphrase</font><font color="#007700">, </font><font color="#0000BB">true</font><font color="#007700">) .<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">md5</font><font color="#007700">(</font><font color="#DD0000">'pass2'</font><font color="#007700">.</font><font color="#0000BB">$passphrase</font><font color="#007700">, </font><font color="#0000BB">true</font><font color="#007700">), </font><font color="#0000BB">0</font><font color="#007700">, </font><font color="#0000BB">24</font><font color="#007700">);<br /></font><font color="#0000BB">$opts </font><font color="#007700">= array(</font><font color="#DD0000">'iv'</font><font color="#007700">=&gt;</font><font color="#0000BB">$iv</font><font color="#007700">, </font><font color="#DD0000">'key'</font><font color="#007700">=&gt;</font><font color="#0000BB">$key</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$fp </font><font color="#007700">= </font><font color="#0000BB">fopen</font><font color="#007700">(</font><font color="#DD0000">'secert-file.enc'</font><font color="#007700">, </font><font color="#DD0000">'wb'</font><font color="#007700">);<br /></font><font color="#0000BB">stream_filter_append</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#DD0000">'mcrypt.tripledes'</font><font color="#007700">, </font><font color="#0000BB">STREAM_FILTER_WRITE</font><font color="#007700">, </font><font color="#0000BB">$opts</font><font color="#007700">);<br /></font><font color="#0000BB">fwrite</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#DD0000">'Secret secret secret data'</font><font color="#007700">);<br /></font><font color="#0000BB">fclose</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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><DIV
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><A
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></A
><P
><B
>例 O-11. 读取加密的文件</B
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$passphrase </font><font color="#007700">= </font><font color="#DD0000">'My secret'</font><font color="#007700">;<br /><br /></font><font color="#FF8000">/* Turn a human readable passphrase<br /> * into a reproducable iv/key pair<br /> */<br /></font><font color="#0000BB">$iv </font><font color="#007700">= </font><font color="#0000BB">substr</font><font color="#007700">(</font><font color="#0000BB">md5</font><font color="#007700">(</font><font color="#DD0000">'iv'</font><font color="#007700">.</font><font color="#0000BB">$passphrase</font><font color="#007700">, </font><font color="#0000BB">true</font><font color="#007700">), </font><font color="#0000BB">0</font><font color="#007700">, </font><font color="#0000BB">8</font><font color="#007700">);<br /></font><font color="#0000BB">$key </font><font color="#007700">= </font><font color="#0000BB">substr</font><font color="#007700">(</font><font color="#0000BB">md5</font><font color="#007700">(</font><font color="#DD0000">'pass1'</font><font color="#007700">.</font><font color="#0000BB">$passphrase</font><font color="#007700">, </font><font color="#0000BB">true</font><font color="#007700">) .<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">md5</font><font color="#007700">(</font><font color="#DD0000">'pass2'</font><font color="#007700">.</font><font color="#0000BB">$passphrase</font><font color="#007700">, </font><font color="#0000BB">true</font><font color="#007700">), </font><font color="#0000BB">0</font><font color="#007700">, </font><font color="#0000BB">24</font><font color="#007700">);<br /></font><font color="#0000BB">$opts </font><font color="#007700">= array(</font><font color="#DD0000">'iv'</font><font color="#007700">=&gt;</font><font color="#0000BB">$iv</font><font color="#007700">, </font><font color="#DD0000">'key'</font><font color="#007700">=&gt;</font><font color="#0000BB">$key</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$fp </font><font color="#007700">= </font><font color="#0000BB">fopen</font><font color="#007700">(</font><font color="#DD0000">'secert-file.enc'</font><font color="#007700">, </font><font color="#DD0000">'rb'</font><font color="#007700">);<br /></font><font color="#0000BB">stream_filter_append</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#DD0000">'mdecrypt.tripledes'</font><font color="#007700">, </font><font color="#0000BB">STREAM_FILTER_WRITE</font><font color="#007700">, </font><font color="#0000BB">$opts</font><font color="#007700">);<br /></font><font color="#0000BB">$data </font><font color="#007700">= </font><font color="#0000BB">rtrim</font><font color="#007700">(</font><font color="#0000BB">stream_get_contents</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">));<br /></font><font color="#0000BB">fclose</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">);<br /><br />echo </font><font color="#0000BB">$data</font><font color="#007700">;<br /></font><font color="#0000BB">?&gt;</font>
</font>
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