php 使用openssl_verify验证签名实例程序

/**

* 验证签名

* TobeVerified 待验证签名的密文

* PlainText 待验证签名的明文

* CertFile 签名者公钥证书

* return 验证成功返回true，失败返回false(从LastErrMsg属性获取失败原因)

*/
function VerifyMsg($TobeVerified, $PlainText, $CertFile,$signature_alg=OPENSSL_ALGO_SHA1)
{


//用公钥验签
$fp=fopen($CertFile,"r");
if(!$fp)
{

//echo "Error Number:-10005, Error Description: ER_FIND_CERT_FAILED（找不到证书）";
return false;
}
$pub_key=fread($fp,8192);
fclose($fp);
$res = openssl_get_publickey($pub_key);
if (1==openssl_verify($PlainText,pack("H" . strlen($TobeVerified), $TobeVerified) , $res,$signature_alg))
{

//print("www.bKjia.c0m提示您：验证成功"."
");
return true;
}
else
{

//echo "Error Number:-10021, Error Description: ER_VERIFY_ERROR（验签失败）|".openssl_error_string();
return false;
}

}

?>