关于PHP生成证书密钥的资料真是好少啊，查了半天，最终还是在官方文档找到了相关资料，又根据自己的理解，整理成了以下代码，分成两部分：生成证书密钥、加密解密数据。直接复制下来做成两个文件运行就好啦。已经写了详细的注释，相信PHP程序员都能看得懂。

generate.php

    <?php        $dn = array(            "countryName" => 'XX', //所在国家名称            "stateOrProvinceName" => 'State', //所在省份名称            "localityName" => 'SomewhereCity', //所在城市名称            "organizationName" => 'MySelf',   //注册人姓名            "organizationalUnitName" => 'Whatever', //组织名称            "commonName" => 'mySelf', //公共名称            "emailAddress" => 'user@domain.com' //邮箱        );                $privkeypass = '111111'; //私钥密码        $numberofdays = 365;     //有效时长        $cerpath = "./test.cer"; //生成证书路径        $pfxpath = "./test.pfx"; //密钥文件路径                        //生成证书        $privkey = openssl_pkey_new();        $csr = openssl_csr_new($dn, $privkey);        $sscert = openssl_csr_sign($csr, null, $privkey, $numberofdays);        openssl_x509_export($sscert, $csrkey); //导出证书$csrkey        openssl_pkcs12_export($sscert, $privatekey, $privkey, $privkeypass); //导出密钥$privatekey        //生成证书文件        $fp = fopen($cerpath, "w");        fwrite($fp, $csrkey);        fclose($fp);        //生成密钥文件        $fp = fopen($pfxpath, "w");        fwrite($fp, $privatekey);        fclose($fp);        ?>  

    <?php        $privkeypass = '111111'; //私钥密码        $pfxpath = "./test.pfx"; //密钥文件路径        $priv_key = file_get_contents($pfxpath); //获取密钥文件内容        $data = "test"; //加密数据测试test                //私钥加密        openssl_pkcs12_read($priv_key, $certs, $privkeypass); //读取公钥、私钥        $prikeyid = $certs['pkey']; //私钥        openssl_sign($data, $signMsg, $prikeyid,OPENSSL_ALGO_SHA1); //注册生成加密信息        $signMsg = base64_encode($signMsg); //base64转码加密信息                        //公钥解密        $unsignMsg=base64_decode($signMsg);//base64解码加密信息        openssl_pkcs12_read($priv_key, $certs, $privkeypass); //读取公钥、私钥        $pubkeyid = $certs['cert']; //公钥        $res = openssl_verify($data, $unsignMsg, $pubkeyid); //验证        echo $res; //输出验证结果，1：验证成功，0：验证失败        ?>