PHP非对称加密方法私钥及公钥加密解密的方法

私钥公钥获取方式如下：
①. 访问在线生成非对称加密公钥私钥对: http://web.chacuo.net/netrsakeypair
点击生成密钥对,删除RSA生成格式-> BEGIN RSA PRIVATE KEY 和 END PUBLIC KEY ,即第一行和最后一行。
②. 访问在线字符串文本压缩工具，删除文本中的所有新行、制表键、空格、回车、换行 字符: http://www.ab173.com/other/compress.php
将生成的公钥和私钥复制到压缩文本框中去除换行和空格
③. 把公钥上传至商户后台,平台会使用该公钥进行解密并且验签。
④. 私钥自己隐秘保存(加密用)。

<?php/** * Description: 平台公钥解密获取数据（验签） * Date: 2022/7/1 * @param $data */public function decrypt($data){    ksort($data);    $toSign = '';    foreach ($data as $key => $value) {        if (strcmp($key, 'sign') != 0 && $value != '') {            $toSign .= $key . '=' . $value . '&';        }    }    $str = rtrim($toSign, '&');    $encrypted = '';    // 公钥    $pem = chunk_split($this->platform_public_key, 64, "\n");    $pem = "-----BEGIN PUBLIC KEY-----\n" . $pem . "-----END PUBLIC KEY-----\n";    $publickey = openssl_pkey_get_public($pem);    $base64 = str_replace(array('-', '_'), array('+', '/'), $data['sign']);    $crypto = '';    foreach (str_split(base64_decode($base64), 128) as $chunk) {        openssl_public_decrypt($chunk, $decrypted, $publickey);        $crypto .= $decrypted;    }    if ($str != $crypto) {        // 验签失败        record_log([            'msg'  => '验签失败',            'data' => [                'params' => $data,                'str'    => $str,                'crypto' => $crypto,            ],        ], 'globalpay_payin_error_');        exit('Signature verification failed');    }}/** * Description: 私钥加密生成签名 * Date: 2022/7/1 * @param $data * @return mixed */public function encrypt($data){    ksort($data);    $str = '';    foreach ($data as $k => $v) {        if (!empty($v)) {            $str .= (string)$k . '=' . $v . '&';        }    }    $str = rtrim($str, '&');    $encrypted = '';    // 私钥    $pem = chunk_split($this->mch_private_key, 64, "\n");    $pem = "-----BEGIN PRIVATE KEY-----\n" . $pem . "-----END PRIVATE KEY-----\n";    $private_key = openssl_pkey_get_private($pem);    $crypto = '';    foreach (str_split($str, 117) as $chunk) {        openssl_private_encrypt($chunk, $encryptData, $private_key);        $crypto .= $encryptData;    }    $encrypted = base64_encode($crypto);    $encrypted = str_replace(array('+', '/', '='), array('-', '_', ''), $encrypted);    $data['sign'] = $encrypted;    return $data;}

作者：LordForce

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