PHP openssl非对称加密

关于秘钥的生成方式请查看：https://blog.csdn.net/liujihaozhy/article/details/79781468

非对称加密，将生成的公钥提供给外部开发人员，生成的私钥不要泄露

代码如下：

<?php

/**
 * @uses openssl非对称加密
 * @author jhl
 *
 */
class OpensslAuthcode {
	
	//公钥文件地址
	private $certPublicUrl;
	
	//私钥文件地址
	private  $certPrivateUrl;
	
	public function __construct()
	{
		$this->certPublicUrl = __DIR__ . "/opensslkey/cert_public.pem";
		$this->certPrivateUrl = __DIR__ . "/opensslkey/cert_private.pem";
	}
	
	/**
	 *
	 * @uses 生成证书文件
	 * @author jhl
	 * @return file
	 */
	public function exportOpenSSLFile() {
		$config = [
				'digest_alg' => 'sha512',
				'private_key_bits' => 4096,
				'private_key_type' => OPENSSL_KEYTYPE_RSA 
		];
		$res = openssl_pkey_new ( $config );
		if ($res == false) {
			return false;
		}
		openssl_pkey_export ( $res, $private_key );
		$public_key = openssl_pkey_get_details ( $res );
		$public_key = $public_key ['key'];
		file_put_contents ( $this->certPublicUrl, $public_key );
		file_put_contents ( $this->certPrivateUrl, $private_key );
		openssl_free_key ( $res );
	}
	
	/**
	 *
	 * @uses 加密
	 * @author jhl
	 * @param string $string        	
	 * @return string
	 */
	public function encrypt($string) {
		$encrypt_data = '';
		$pp = self::getPublicKey();
		$pubkey = openssl_pkey_get_public($pp);
		openssl_public_encrypt($string, $encrypt_data, $pubkey);
		$encrypt_data = base64_encode($encrypt_data);
		return $encrypt_data;
	}
	
	/**
	 *
	 * @uses 解密
	 * @author jhl
	 * @param string $string        	
	 * @return string
	 */
	public function decrypt($string) {
		// 私钥解密
		$encrypt_data = base64_decode($string);
		$prikey = openssl_pkey_get_private(self::getPrivateKey());
		openssl_private_decrypt($encrypt_data, $decrypt_data, $prikey);
		return $decrypt_data;
	}
	
	/**
	 *
	 * @uses 获取公钥
	 * @author jhl
	 * @param string $string
	 * @return string
	 */
	private function getPublicKey()
	{
		static $sslPublicKey;
		if (!$sslPublicKey) {
			$sslPublicKey = file_get_contents($this->certPublicUrl); 
		}
		return $sslPublicKey;
	}
	
	/**
	 *
	 * @uses 获取私钥
	 * @author jhl
	 * @param string $string        	
	 * @return string
	 */
	private function getPrivateKey()
	{
		static $sslPrivateKey;
		if (!$sslPrivateKey) {
			$sslPrivateKey = file_get_contents ( $this->certPrivateUrl );
		}
		return $sslPrivateKey;
	}
	
}