PHP+OPENSSL非对称加密解密

<?php
	/**
	 * @description  RSA公钥加密 私钥解密
	 * @param string $data 待加解密数据
	 * @param string $operate 操作类型 encode:加密 decode:解密
	 * @return string 返回加密内容/解密内容
	 */
	function RSA_openssl($data, $operate = 'encode') {
		//RSA 公钥
		$rsa_public = '此处填写公钥';
		//RSA 私钥
		$rsa_private = '此处填写私钥';
		//RSA 公钥加密
		if ('encode' == $operate) {
			$public_key = "-----BEGIN PUBLIC KEY-----\n" . wordwrap($rsa_public, 64, "\n", true) . "\n-----END PUBLIC KEY-----";
			$key = openssl_pkey_get_public($public_key);
			if (!$key) {
				return '公钥不可用';
			}
			$return_en = openssl_public_encrypt($data, $crypted, $key);
			if (!$return_en) {
				return '公钥加密失败';
			}
			return base64_encode($crypted);
		}
		//RSA 私钥解密
		if ('decode' == $operate) {
			$private_key = "-----BEGIN PRIVATE KEY-----\n" . wordwrap($rsa_private, 64, "\n", true) . "\n-----END PRIVATE KEY-----";
			$key = openssl_pkey_get_private($private_key);
			if (!$key) {
				return '私钥不可用';
			}
			$return_de = openssl_private_decrypt(base64_decode($data), $decrypted, $key);
			if (!$return_de) {
				return '私钥解密失败';
			}
			return $decrypted;
		}
		return '';
	}
?>