php 生成加密公钥加密私钥

$config = array(  
    //"digest_alg" => "sha512",  
    "private_key_bits" => 512,                     //字节数    512 1024  2048   4096 等  
    "private_key_type" => OPENSSL_KEYTYPE_RSA,     //加密类型  
);  
//1.创建公钥和私钥   返回资源  
$res = openssl_pkey_new($config);  
//从得到的资源中获取私钥    并把私钥赋给$privKey
openssl_pkey_export($res, $privKey);  
//从得到的资源中获取私钥    并把私钥赋给$pubKey
$pubKey = openssl_pkey_get_details($res);  
$pubKey = $pubKey["key"];  
var_dump(array('privKey'=>$privKey,'pubKey'=>$pubKey));  
die;  
//2.加密解密数据  要加密的数据  
$data = 'plaintext data goes here';                         
//对$data进行加密 要加密的数据字符串  得到加密后的数据  加密所需要的公钥
openssl_public_encrypt($data, $encrypted, $pubKey);  
echo base64_encode($encrypted);  
//对加密后的数据进行解密  解密的数据  得到解密后的数据  解密所需要的私钥
$decrypted = base64_decode($encrypted);
openssl_private_decrypt($encrypted, $decrypted, $privKey);  
echo $decrypted;   
//3.一个加密解密类  
class rsa {  
    private $public_key = ''; //公密钥  
    private $private_key = ''; //私密钥  
    private $public_key_resource = ''; //公密钥资源  
    private $private_key_resource = ''; //私密钥资源  
    /** 
     * 架构函数 
     * @param [string] $public_key_file  [公密钥文件地址] 
     * @param [string] $private_key_file [私密钥文件地址] 
     */  
    public function __construct($public_key,$private_key) {  
        $this->public_key = $public_key;     
    $this->private_key = $private_key;
    if(false == ($this->public_key_resource = $this->is_bad_public_key($this->public_key)) || false == ($this->private_key_resource = $this->is_bad_private_key($this->private_key))) {  
      throw new Exception('public key or private key no usable');  
    }  
    }  
    private function is_bad_public_key($public_key) {  
        return openssl_pkey_get_public($public_key);  
    }  
    private function is_bad_private_key($private_key) {  
        return openssl_pkey_get_private($private_key);  
    }  
    /** 
     * 生成一对公私密钥 成功返回 公私密钥数组 失败 返回 false 
     */  
    public function create_key() {  
        $res = openssl_pkey_new();  
        if($res == false) return false;  
        openssl_pkey_export($res, $private_key);  
        $public_key = openssl_pkey_get_details($res);  
        return array('public_key'=>$public_key["key"],'private_key'=>$private_key);  
    }  
    /** 
     * 用私密钥加密 
     */  
    public function private_encrypt($input) {  
        openssl_private_encrypt($input,$output,$this->private_key_resource);  
        return base64_encode($output);  
    }  
    /** 
     * 解密 私密钥加密后的密文 
     */  
    public function public_decrypt($input) {  
        openssl_public_decrypt(base64_decode($input),$output,$this->public_key_resource);  
        return $output;  
    }  
    /** 
     * 用公密钥加密 
     */  
    public function public_encrypt($input) {  
        openssl_public_encrypt($input,$output,$this->public_key_resource);  
        return base64_encode($output);  
    }  
    /** 
     * 解密 公密钥加密后的密文 
     */  
    public function private_decrypt($input) {  
        openssl_private_decrypt(base64_decode($input),$output,$this->private_key_resource);  
        return $output;  
    }  
}  
$private_key = '-----BEGIN RSA PRIVATE KEY-----  
MIICXQIBAAKBgQC3//sR2tXw0wrC2DySx8vNGlqt3Y7ldU9+LBLI6e1KS5lfc5jl  
TGF7KBTSkCHBM3ouEHWqp1ZJ85iJe59aF5gIB2klBd6h4wrbbHA2XE1sq21ykja/  
Gqx7/IRia3zQfxGv/qEkyGOx+XALVoOlZqDwh76o2n1vP1D+tD3amHsK7QIDAQAB  
AoGBAKH14bMitESqD4PYwODWmy7rrrvyFPEnJJTECLjvKB7IkrVxVDkp1XiJnGKH  
2h5syHQ5qslPSGYJ1M/XkDnGINwaLVHVD3BoKKgKg1bZn7ao5pXT+herqxaVwWs6  
ga63yVSIC8jcODxiuvxJnUMQRLaqoF6aUb/2VWc2T5MDmxLhAkEA3pwGpvXgLiWL  
3h7QLYZLrLrbFRuRN4CYl4UYaAKokkAvZly04Glle8ycgOc2DzL4eiL4l/+x/gaq  
deJU/cHLRQJBANOZY0mEoVkwhU4bScSdnfM6usQowYBEwHYYh/OTv1a3SqcCE1f+  
qbAclCqeNiHajCcDmgYJ53LfIgyv0wCS54kCQAXaPkaHclRkQlAdqUV5IWYyJ25f  
oiq+Y8SgCCs73qixrU1YpJy9yKA/meG9smsl4Oh9IOIGI+zUygh9YdSmEq0CQQC2  
4G3IP2G3lNDRdZIm5NZ7PfnmyRabxk/UgVUWdk47IwTZHFkdhxKfC8QepUhBsAHL  
QjifGXY4eJKUBm3FpDGJAkAFwUxYssiJjvrHwnHFbg0rFkvvY63OSmnRxiL4X6EY  
yI9lblCsyfpl25l7l5zmJrAHn45zAiOoBrWqpM5edu7c  
-----END RSA PRIVATE KEY-----';
$public_key = '-----BEGIN PUBLIC KEY-----  
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC3//sR2tXw0wrC2DySx8vNGlqt  
3Y7ldU9+LBLI6e1KS5lfc5jlTGF7KBTSkCHBM3ouEHWqp1ZJ85iJe59aF5gIB2kl  
Bd6h4wrbbHA2XE1sq21ykja/Gqx7/IRia3zQfxGv/qEkyGOx+XALVoOlZqDwh76o  
2n1vP1D+tD3amHsK7QIDAQAB  
-----END PUBLIC KEY-----';
$rsa = new rsa($public_key,$private_key);   
$str = '加密解密';  
$str = $rsa->public_encrypt($str); //用公密钥加密  
echo $str,'</br>';  
$str = $rsa->private_decrypt($str); //用私密钥解密  
echo $str,'</br>';  
//=============================================================  
$str = $rsa->private_encrypt($str); //用私密钥加密  
echo $str,'</br>';  
$str = $rsa->public_decrypt($str); //用公密钥解密  
echo $str,'</br>';