PHP generates encryption public key encryption private key example code

The concept of public key: The public key can be uploaded on the network, which means that both the receiving and sending parties can know each other's public key. Of course, if you use network sniffing and other technologies, you can also The contents of the public key can be sniffed on the network, but you cannot decrypt the file with only the public key.

The concept of private key: The private key is private to each user and will not be transmitted on the network (that is, there is no need for the receiving and sending parties to exchange this key with each other), which ensures the security of this password. , hackers cannot sniff the key in the network, but it is strictly stored in the user's own host.

The relationship between public key and private key: only the private key can unlock the data encrypted by the public key, and only the public key can unlock the data encrypted by the private key, and neither of them can unlock themselves! This is key to ensuring that data cannot be stolen! The only difference between public keys and private keys is that the public keys are exchanged with each other and transmitted over the network, while the private keys themselves are retained and not transmitted over the network.

This article mainly introduces relevant information on how to generate an encrypted public key and encrypt a private key instance in PHP. Friends who need it can refer to

php Generate an encrypted public key and encrypt a private key instance. Detailed explanation

Generating public and private keys Under win, openssl.cof must be supported Liunx usually comes with installation

$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,&#39;</br>&#39;; 
$str = $rsa->private_decrypt($str); //用私密钥解密 
echo $str,&#39;</br>&#39;; 
//============================================================= 
$str = $rsa->private_encrypt($str); //用私密钥加密 
echo $str,&#39;</br>&#39;; 
$str = $rsa->public_decrypt($str); //用公密钥解密 
echo $str,&#39;</br>&#39;;

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