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>openssl_sign</H1
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><P
>    (PHP 4 &#62;= 4.0.4)</P
>openssl_sign&nbsp;--&nbsp;Generate signature</DIV
><DIV
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><A
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><H2
>Description</H2
>bool <B
CLASS="methodname"
>openssl_sign</B
> ( string data, string signature, mixed priv_key_id)<BR
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>Warning</B
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>This function is
<SPAN
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><I
CLASS="emphasis"
>EXPERIMENTAL</I
></SPAN
>. The behaviour of this function, the
name of this function, and anything else documented about this
function may change without notice in a future release of PHP. 
Use this function at your own risk.</P
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>&#13;     Returns <TT
CLASS="constant"
><B
>TRUE</B
></TT
> on success or <TT
CLASS="constant"
><B
>FALSE</B
></TT
> on failure.
     If successful the signature is returned in
     <TT
CLASS="parameter"
><I
>signature</I
></TT
>. 
    </P
><P
>&#13;     <B
CLASS="function"
>openssl_sign()</B
> computes a signature for the
     specified <TT
CLASS="parameter"
><I
>data</I
></TT
> by using SHA1 for hashing
     followed by encryption using the private key associated with
     <TT
CLASS="parameter"
><I
>priv_key_id</I
></TT
>. Note that the data itself is
     not encrypted.
    </P
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><B
>Example 1. <B
CLASS="function"
>openssl_sign()</B
> example</B
></P
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><PRE
CLASS="php"
>// $data is assumed to contain the data to be signed

// fetch private key from file and ready it
$fp = fopen("/src/openssl-0.9.6/demos/sign/key.pem", "r");
$priv_key = fread($fp, 8192);
fclose($fp);
$pkeyid = openssl_get_privatekey($priv_key);

// compute signature
openssl_sign($data, $signature, $pkeyid);

// free the key from memory
openssl_free_key($pkeyid);</PRE
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>&#13;     See also <A
HREF="function.openssl-verify.html"
><B
CLASS="function"
>openssl_verify()</B
></A
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