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>openssl_sign</H1
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><P
>    (PHP 4 &#62;= 4.0.4, PHP 5)</P
>openssl_sign&nbsp;--&nbsp;Generate signature</DIV
><DIV
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><A
NAME="AEN164460"
></A
><H2
>Description</H2
>bool <B
CLASS="methodname"
>openssl_sign</B
> ( string data, string &#38;signature, mixed priv_key_id [, int signature_alg] )<BR
></BR
><P
>&#13;     如果成功则返回 <TT
CLASS="constant"
><B
>TRUE</B
></TT
>，失败则返回 <TT
CLASS="constant"
><B
>FALSE</B
></TT
>。
     If successful the signature is returned in
     <CODE
CLASS="parameter"
>signature</CODE
>. 
    </P
><P
>&#13;     <B
CLASS="function"
>openssl_sign()</B
> computes a signature for the
     specified <CODE
CLASS="parameter"
>data</CODE
> by using SHA1 for hashing
     followed by encryption using the private key associated with
     <CODE
CLASS="parameter"
>priv_key_id</CODE
>. Note that the data itself is
     not encrypted.
    </P
><DIV
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CLASS="note"
><P
><B
>注意: </B
>
      Optional 4th parameter <CODE
CLASS="parameter"
>signature_alg</CODE
> was added in
      version 5.0.0. Its default value is
      <TT
CLASS="constant"
><B
>OPENSSL_ALGO_SHA1</B
></TT
>. For more information see the
      list of <A
HREF="ref.openssl.html#openssl.signature-algos"
>Signature Algorithms</A
>.
     </P
></BLOCKQUOTE
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><B
>例 1. <B
CLASS="function"
>openssl_sign()</B
> example</B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /></font><font color="#FF8000">// $data is assumed to contain the data to be signed<br /><br />// fetch private key from file and ready it<br /></font><font color="#0000BB">$fp </font><font color="#007700">= </font><font color="#0000BB">fopen</font><font color="#007700">(</font><font color="#DD0000">"/src/openssl-0.9.6/demos/sign/key.pem"</font><font color="#007700">, </font><font color="#DD0000">"r"</font><font color="#007700">);<br /></font><font color="#0000BB">$priv_key </font><font color="#007700">= </font><font color="#0000BB">fread</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#0000BB">8192</font><font color="#007700">);<br /></font><font color="#0000BB">fclose</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">);<br /></font><font color="#0000BB">$pkeyid </font><font color="#007700">= </font><font color="#0000BB">openssl_get_privatekey</font><font color="#007700">(</font><font color="#0000BB">$priv_key</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// compute signature<br /></font><font color="#0000BB">openssl_sign</font><font color="#007700">(</font><font color="#0000BB">$data</font><font color="#007700">, </font><font color="#0000BB">$signature</font><font color="#007700">, </font><font color="#0000BB">$pkeyid</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// free the key from memory<br /></font><font color="#0000BB">openssl_free_key</font><font color="#007700">(</font><font color="#0000BB">$pkeyid</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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    </P
><P
>&#13;     See also <A
HREF="function.openssl-verify.html"
><B
CLASS="function"
>openssl_verify()</B
></A
>.
    </P
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