php 封装 rsa2 公私钥加密

可以使用openssl扩展来实现RSA加密和解密。以下是一个简单的PHP封装RSA2公私钥加密的示例代码：

<?php

class RSA2Encryption {
    private $publicKey;
    private $privateKey;

    public function __construct($publicKey, $privateKey) {
        $this->publicKey = $publicKey;
        $this->privateKey = $privateKey;
    }

    public function encrypt($data) {
        $encrypted = '';
        $publicKey = openssl_get_publickey($this->publicKey);
        openssl_public_encrypt($data, $encrypted, $publicKey, OPENSSL_PKCS1_OAEP_PADDING);
        return base64_encode($encrypted);
    }

    public function decrypt($encryptedData) {
        $decrypted = '';
        $privateKey = openssl_get_privatekey($this->privateKey);
        openssl_private_decrypt(base64_decode($encryptedData), $decrypted, $privateKey, OPENSSL_PKCS1_OAEP_PADDING);
        return $decrypted;
    }
}

// Example usage
$publicKey = file_get_contents('public_key.pem');
$privateKey = file_get_contents('private_key.pem');

$rsa = new RSA2Encryption($publicKey, $privateKey);

$encryptedData = $rsa->encrypt('Hello, world!');
echo "Encrypted data: $encryptedData\n";

$decryptedData = $rsa->decrypt($encryptedData);
echo "Decrypted data: $decryptedData\n";

?>

请注意，此示例代码仅用于演示目的。在实际应用中，您需要采取更多的安全措施，例如使用密码保护私钥文件，以及使用更强的加密算法和密钥长度。