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php-manual-en-4.3.0-2mdk.noarch.rpm

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>openssl_verify</H1
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><P
>    (PHP 4 &#62;= 4.0.4)</P
>openssl_verify&nbsp;--&nbsp;Verify signature</DIV
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NAME="AEN68708"
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><H2
>Description</H2
>int <B
CLASS="methodname"
>openssl_verify</B
> ( string data, string signature, mixed pub_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 1 if the signature is correct, 0 if it is incorrect, and
     -1 on error.
    </P
><P
>&#13;     <B
CLASS="function"
>openssl_verify()</B
> verifies that the
     <TT
CLASS="parameter"
><I
>signature</I
></TT
> is correct for the specified
     <TT
CLASS="parameter"
><I
>data</I
></TT
> using the public key associated with
     <TT
CLASS="parameter"
><I
>pub_key_id</I
></TT
>. This must be the public key
     corresponding to the private key used for signing.
    </P
><P
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><B
>Example 1. <B
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>openssl_verify()</B
> example</B
></P
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><PRE
CLASS="php"
>// $data and $signature are assumed to contain the data and the signature

// fetch public key from certificate and ready it
$fp = fopen("/src/openssl-0.9.6/demos/sign/cert.pem", "r");
$cert = fread($fp, 8192);
fclose($fp);
$pubkeyid = openssl_get_publickey($cert);

// state whether signature is okay or not
$ok = openssl_verify($data, $signature, $pubkeyid);
if ($ok == 1)
    echo "good";
elseif ($ok == 0)
    echo "bad";
else
    echo "ugly, error checking signature";

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