//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($input),$this->public_key_resource);
  return $output;
  }
  /**
• 用公密钥加密
  */
  public function public_encrypt($input) {
  openssl_public_encrypt($input,$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($input),$this->private_key_resource);
  return $output;
  }
  }

$private_key = '-----BEGIN RSA PRIVATE KEY-----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-----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,'
';
$str = $rsa->private_decrypt($str); //用私密钥解密
echo $str,'
';
//=============================================================
$str = $rsa->private_encrypt($str); //用私密钥加密
echo $str,'
';
$str = $rsa->public_decrypt($str); //用公密钥解密
echo $str,'
';