基于PHP OpenSSL 扩展 生成RSA密钥对，和RSA加密解密，且支持长文加密和解密。
条件：
需要安装开启OpenSSL扩展。
PHP RSA 效果：
1、RSA RSA生成公钥和私钥对>> RSA 密钥生成
2、RSA加密解密，且支持长文加密和解密 >> RSA 公钥/私钥加解密
PHP RSA处理类：
<?php
/**
* PHP RSA生成公钥和私钥对及加解密
*/
namespace rsa;
class RsaHandle
{
/**
* RsaHandle constructor.
* @throws \Exception
*/
public function __construct()
{
//检查 扩展是否安装
if (extension_loaded('openssl') == false){
$msg = "请先安装开启openssl扩展";
throw new \Exception($msg);
}
}
/**
* 创建生成密钥 公钥私钥
* @param int $private_key_bits 指定多少位来生成私钥 //字节数 512 1024 2048 4096 等 ,不能加引号，此处长度与加密的字符串长度有关系
* @return array
*/
public function createRsaKey($private_key_bits = 1024)
{
//参考文章
//https://www.cnblogs.com/guliang/p/16171260.html
//配置信息
$config = array(
//'digest_alg' => 'sha512',
'private_key_bits' => $private_key_bits,//指定多少位来生成私钥 //字节数 512 1024 2048 4096 等 ,不能加引号，此处长度与加密的字符串长度有关系
'private_key_type' => OPENSSL_KEYTYPE_RSA //加密类型
);
$system_name = PHP_OS;
if ($system_name === "WINNT"){
//windows系统
//报错 openssl_pkey_export(): cannot get key from parameter 1这个问题 是 没有找到 config cnf 文件路径，我这里用的是PHPstudy Apache 目录有 直接指向 就可
//https://blog.csdn.net/jachinFang/article/details/94598969
//将apache中的openssl.cnf复制 $config['config'] 进去，然后就可以尝试测试结果了
$config['config'] = 'D:\phpstudy_pro\Extensions\Apache2.4.39\conf/openssl.cnf';//找到你的PHP目录下openssl配置文件
}
$res = openssl_pkey_new($config);
//获取私钥
openssl_pkey_export($res, $private_key, null, $config);
//获取公钥
$details = openssl_pkey_get_details($res);
$public_key = $details['key'];
return array('public_key' => $public_key, 'private_key' => $private_key);
}
/**
* 获取密钥分段加密长度.
* @param $keyClosure openssl_pkey_get_public($this->config['publicKey']) : openssl_pkey_get_private($this->config['privateKey']);
* @return float|int
* @throws \Exception
*/
protected function getEncryptBlockLen($keyClosure)
{
$key_info = openssl_pkey_get_details($keyClosure);
if (!$key_info)
{
$msg = '获取加密密钥信息失败' . openssl_error_string();
throw new \Exception($msg);
}
// bits数除以8 减去padding长度，OPENSSL_PKCS1_PADDING 长度是11
// php openssl 默认填充方式是 OPENSSL_PKCS1_PADDING
return $key_info['bits'] / 8 - 11;
}
/**
* 获取密钥分段解密长度.
* @param $keyClosure openssl_pkey_get_public($this->config['publicKey']) : openssl_pkey_get_private($this->config['privateKey']);
* @return float|int
* @throws \Exception
*/
protected function getDecryptBlockLen($keyClosure)
{
$key_info = openssl_pkey_get_details($keyClosure);
if (!$key_info)
{
$msg = '获取解密密钥信息失败' . openssl_error_string();
throw new \Exception($msg);
}
// bits数除以8得到字符长度
return $key_info['bits'] / 8;
}
/**
* 公钥加密
* @param $text
* @param string $public_key
* @return string
* @throws \Exception
*/
public function rsaEncodePublic($text, $public_key = '公钥加密私钥解密')
{
$keyClosure = openssl_pkey_get_public($public_key);
if (!$keyClosure) {
$msg = '公钥不可用';
throw new \Exception($msg);
}
//RSA进行加密
$encrypt = '';
$plainData = str_split($text, $this->getEncryptBlockLen($keyClosure));
foreach ($plainData as $key => $encrypt_item)
{
$isEncrypted = openssl_public_encrypt($encrypt_item, $encrypted, $keyClosure);
if (!$isEncrypted)
{
$msg = '加密数据失败,请检查密钥是否合法,' . openssl_error_string();
throw new \Exception($msg);
}
$encrypt .= $encrypted;
}
$encrypt = base64_encode($encrypt);
//返回
return $encrypt;
}
/**
* 私钥加密
* @param $text
* @param string $private_key
* @return string
* @throws \Exception
*/
public function rsaEncodePrivate($text, $private_key = '私钥加密公钥解密')
{
$keyClosure = openssl_pkey_get_private($private_key);
if (!$keyClosure) {
$msg = '私钥不可用';
throw new \Exception($msg);
}
//RSA进行加密
$encrypt = '';
$plainData = str_split($text, $this->getEncryptBlockLen($keyClosure));
foreach ($plainData as $key => $encrypt_item)
{
$isEncrypted = openssl_private_encrypt($encrypt_item, $encrypted, $keyClosure);
if (!$isEncrypted)
{
$msg = '加密数据失败,请检查密钥是否合法,' . openssl_error_string();
throw new \Exception($msg);
}
$encrypt .= $encrypted;
}
$encrypt = base64_encode($encrypt);
//返回
return $encrypt;
}
/**
* 私钥解密
* @param $text
* @param string $private_key
* @return string
* @throws \Exception
*/
public function rsaDecodePrivate($text,$private_key = '公钥加密私钥解密')
{
$keyClosure = openssl_pkey_get_private($private_key);
if (!$keyClosure) {
$msg = '私钥不可用';
throw new \Exception($msg);
}
//RSA进行解密
$data = base64_decode($text);
$data = str_split($data, $this->getDecryptBlockLen($keyClosure));
$decrypt = '';
foreach ($data as $key => $chunk)
{
$isDecrypted = openssl_private_decrypt($chunk, $encrypted, $keyClosure);
if (!$isDecrypted)
{
$msg = '解密数据失败,请检查密钥是否合法,' . openssl_error_string();
throw new \Exception($msg);
}
$decrypt .= $encrypted;
}
//返回
return $decrypt;
}
/**
* 公钥解密
* @param $text
* @param string $public_key
* @return string
* @throws \Exception
*/
public function rsaDecodePublic($text,$public_key = '私钥加密公钥解密')
{
$keyClosure = openssl_pkey_get_public($public_key);
if (!$keyClosure) {
$msg = '公钥不可用';
throw new \Exception($msg);
}
//RSA进行解密
$data = base64_decode($text);
$data = str_split($data, $this->getDecryptBlockLen($keyClosure));
$decrypt = '';
foreach ($data as $key => $chunk)
{
$isDecrypted = openssl_public_decrypt($chunk, $encrypted, $keyClosure);
if (!$isDecrypted)
{
$msg = '解密数据失败,请检查密钥是否合法,' . openssl_error_string();
throw new \Exception($msg);
}
$decrypt .= $encrypted;
}
//返回
return $decrypt;
}
}参考文章：
https://php.net/manual/en/function.openssl-pkey-new.php
https://www.cnblogs.com/guliang/p/16171260.html
https://blog.csdn.net/jachinFang/article/details/94598969