PHP asymmetric encryption method private key and public key encryption and decryption method

The private key and public key are obtained as follows ：
①. Access online to generate asymmetric encrypted public and private key pairs : http://web.chacuo.net/netrsakeypair
Click generate key pair , Delete RSA Generate format -> BEGIN RSA PRIVATE KEY and END PUBLIC KEY , That is, the first and last lines .
②. Access the online string text compression tool , Delete all new lines in the text 、 Tabulation key 、 Space 、 enter 、 Line break character : http://www.ab173.com/other/compress.php
Copy the generated public and private keys into the compressed text box to remove line breaks and spaces
③. Upload the public key to the merchant background , The platform will use the public key to decrypt and verify the signature .
④. The private key is kept secretly ( Encryption uses ).

<?php/** * Description:  The platform decrypts the public key to obtain data （ attestation ） * 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 = '';    //  Public key     $pem = chunk_split($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) {        //  Attestation of failure         record_log([            'msg'  => ' Attestation of failure ',            'data' => [                'params' => $data,                'str'    => $str,                'crypto' => $crypto,            ],        ], 'globalpay_payin_error_');        exit('Signature verification failed');    }}/** * Description:  Private key encryption generates signature  * 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 = '';    //  Private key     $pem = chunk_split($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;}

author ：LordForce

Game programming , A game development favorite ~

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