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>Encryption Filters</A
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><P
> Os filtros <TT
CLASS="literal"
>mcrypt.*</TT
> e <TT
CLASS="literal"
>mdecrypt.*</TT
>
permitem criptografar e descriptografar usando libmcrypt.
Ambos os conjuntos de filtros suportam os mesmos algoritmos disponíveis na
<A
HREF="ref.mcrypt.html"
>extensão mcrypt</A
> na forma de
<TT
CLASS="literal"
>mcrypt.ciphername</TT
> onde <CODE
CLASS="parameter"
>ciphername</CODE
>
é o nome da cifra como seria passada para
<A
HREF="function.mcrypt-module-open.html"
><B
CLASS="function"
>mcrypt_module_open()</B
></A
>.
Os cinco filtros a seguir estão disponíveis:
</P
><P
> <DIV
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><A
NAME="AEN289436"
></A
><P
><B
>Tabela O-1. parâmetros para os filtros mcrypt</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><COL><COL><THEAD
><TR
><TH
>Parâmetro</TH
><TH
>É Necessário?</TH
><TH
>Valor Padrão</TH
><TH
>Exemplos de Valores</TH
></TR
></THEAD
><TBODY
><TR
><TD
>Modo</TD
><TD
>Opcional</TD
><TD
>cbc</TD
><TD
>cbc, cfb, ecb, nofb, ofb, stream</TD
></TR
><TR
><TD
>algorithms_dir</TD
><TD
>Opcional</TD
><TD
>ini_get('mcrypt.algorithms_dir')</TD
><TD
>Localização do módulos de algoritmos</TD
></TR
><TR
><TD
>modes_dir</TD
><TD
>Opcional</TD
><TD
>ini_get('mcrypt.modes_dir')</TD
><TD
>Localização do módulos de modos</TD
></TR
><TR
><TD
>iv</TD
><TD
>Necessário</TD
><TD
>N/A</TD
><TD
>Tipicamente 8, 16, or 32 bytes de dados binários. Dependa da cifra.</TD
></TR
><TR
><TD
>key</TD
><TD
>Necessário</TD
><TD
>N/A</TD
><TD
>Tipicamente 8, 16, or 32 bytes de dados binários. Dependa da cifra.</TD
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>
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><TD
><DIV
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><A
NAME="AEN289471"
></A
><P
><B
>Exemplo O-10. Criptografando saída de arquivo usando 3DES</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB"><?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">$passphrase</font><font color="#007700">, </font><font color="#0000BB">true</font><font color="#007700">) .<br /> </font><font color="#0000BB">md5</font><font color="#007700">(</font><font color="#DD0000">'pass2'</font><font color="#007700">.</font><font color="#0000BB">$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">$opts </font><font color="#007700">= array(</font><font color="#DD0000">'iv'</font><font color="#007700">=></font><font color="#0000BB">$iv</font><font color="#007700">, </font><font color="#DD0000">'key'</font><font color="#007700">=></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">?></font>
</font>
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><DIV
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><A
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></A
><P
><B
>Exemplo O-11. Lendo um arquivo criptografado</B
></P
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><TD
><code><font color="#000000">
<font color="#0000BB"><?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">$passphrase</font><font color="#007700">, </font><font color="#0000BB">true</font><font color="#007700">) .<br /> </font><font color="#0000BB">md5</font><font color="#007700">(</font><font color="#DD0000">'pass2'</font><font color="#007700">.</font><font color="#0000BB">$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">$opts </font><font color="#007700">= array(</font><font color="#DD0000">'iv'</font><font color="#007700">=></font><font color="#0000BB">$iv</font><font color="#007700">, </font><font color="#DD0000">'key'</font><font color="#007700">=></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">?></font>
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