php RSA 加解密实例

  1 <?php
  2 header("Content-Type: text/html;charset=utf-8");
  3 /*
  4 
  5 生成公钥、私钥对，私钥加密的内容能通过公钥解密（反过来亦可以）
  6 
  7 下载开源RSA密钥生成工具openssl（通常Linux系统都自带该程序），解压缩至独立的文件夹，进入其中的bin目录，执行以下命令：
  8 
  9 openssl genrsa -out rsa_private_key.pem 1024 #生成原始 RSA私钥文件 rsa_private_key.pem
 10 openssl pkcs8 -topk8 -inform PEM -in rsa_private_key.pem -outform PEM -nocrypt -out private_key.pem #将原始 RSA私钥转换为 pkcs8格式
 11 openssl rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pem #通过私钥生成对应 RSA公钥 rsa_public_key.pem
 12 
 13 */
 14 $private_key = '-----BEGIN RSA PRIVATE KEY-----
 15 MIICXQIBAAKBgQC3//sR2tXw0wrC2DySx8vNGlqt3Y7ldU9+LBLI6e1KS5lfc5jl
 16 TGF7KBTSkCHBM3ouEHWqp1ZJ85iJe59aF5gIB2klBd6h4wrbbHA2XE1sq21ykja/
 17 Gqx7/IRia3zQfxGv/qEkyGOx+XALVoOlZqDwh76o2n1vP1D+tD3amHsK7QIDAQAB
 18 AoGBAKH14bMitESqD4PYwODWmy7rrrvyFPEnJJTECLjvKB7IkrVxVDkp1XiJnGKH
 19 2h5syHQ5qslPSGYJ1M/XkDnGINwaLVHVD3BoKKgKg1bZn7ao5pXT+herqxaVwWs6
 20 ga63yVSIC8jcODxiuvxJnUMQRLaqoF6aUb/2VWc2T5MDmxLhAkEA3pwGpvXgLiWL
 21 3h7QLYZLrLrbFRuRN4CYl4UYaAKokkAvZly04Glle8ycgOc2DzL4eiL4l/+x/gaq
 22 deJU/cHLRQJBANOZY0mEoVkwhU4bScSdnfM6usQowYBEwHYYh/OTv1a3SqcCE1f+
 23 qbAclCqeNiHajCcDmgYJ53LfIgyv0wCS54kCQAXaPkaHclRkQlAdqUV5IWYyJ25f
 24 oiq+Y8SgCCs73qixrU1YpJy9yKA/meG9smsl4Oh9IOIGI+zUygh9YdSmEq0CQQC2
 25 4G3IP2G3lNDRdZIm5NZ7PfnmyRabxk/UgVUWdk47IwTZHFkdhxKfC8QepUhBsAHL
 26 QjifGXY4eJKUBm3FpDGJAkAFwUxYssiJjvrHwnHFbg0rFkvvY63OSmnRxiL4X6EY
 27 yI9lblCsyfpl25l7l5zmJrAHn45zAiOoBrWqpM5edu7c
 28 -----END RSA PRIVATE KEY-----';
 29 $public_key = '-----BEGIN PUBLIC KEY-----
 30 MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC3//sR2tXw0wrC2DySx8vNGlqt
 31 3Y7ldU9+LBLI6e1KS5lfc5jlTGF7KBTSkCHBM3ouEHWqp1ZJ85iJe59aF5gIB2kl
 32 Bd6h4wrbbHA2XE1sq21ykja/Gqx7/IRia3zQfxGv/qEkyGOx+XALVoOlZqDwh76o
 33 2n1vP1D+tD3amHsK7QIDAQAB
 34 -----END PUBLIC KEY-----';
 35 file_put_contents('public_key.txt', $public_key);
 36 file_put_contents('private_key.txt', $private_key);
 37 
 38 /**
 39 * rsa 非对称加解密
 40 */
 41 class rsa {
 42     private $public_key = ''; //公密钥
 43     private $private_key = ''; //私密钥
 44     private $public_key_resource = ''; //公密钥资源
 45     private $private_key_resource = ''; //私密钥资源
 46     /**
 47      * 架构函数
 48      * @param [string] $public_key_file  [公密钥文件地址]
 49      * @param [string] $private_key_file [私密钥文件地址]
 50      */
 51     public function __construct($public_key_file,$private_key_file) {
 52         try {
 53             if(!file_exists($public_key_file) || !file_exists($private_key_file)) {
 54                 throw new Exception('key file no exists');
 55             }
 56             if (false == ($this->public_key = file_get_contents($public_key_file)) || false == ($this->private_key = file_get_contents($private_key_file))) {
 57                 throw new Exception('read key file fail');
 58             }
 59             if(false == ($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))) {
 60                 throw new Exception('public key or private key no usable');
 61             }
 62 
 63         } catch (Exception $e) {
 64             die($e->getMessage());
 65         }    
 66     }
 67     private function is_bad_public_key($public_key) {
 68         return openssl_pkey_get_public($public_key);
 69     }
 70     private function is_bad_private_key($private_key) {
 71         return openssl_pkey_get_private($private_key);
 72     }
 73     /**
 74      * 生成一对公私密钥 成功返回 公私密钥数组 失败 返回 false
 75      */
 76     public function create_key() {
 77         $res = openssl_pkey_new();
 78         if($res == false) return false;
 79         openssl_pkey_export($res, $private_key);
 80         $public_key = openssl_pkey_get_details($res);
 81         return array('public_key'=>$public_key["key"],'private_key'=>$private_key);
 82     }
 83     /**
 84      * 用私密钥加密
 85      */
 86     public function private_encrypt($input) {
 87         openssl_private_encrypt($input,$output,$this->private_key_resource);
 88         return base64_encode($output);
 89     }
 90     /**
 91      * 解密 私密钥加密后的密文
 92      */
 93     public function public_decrypt($input) {
 94         openssl_public_decrypt(base64_decode($input),$output,$this->public_key_resource);
 95         return $output;
 96     }
 97     /**
 98      * 用公密钥加密
 99      */
100     public function public_encrypt($input) {
101         openssl_public_encrypt($input,$output,$this->public_key_resource);
102         return base64_encode($output);
103     }
104     /**
105      * 解密 公密钥加密后的密文
106      */
107     public function private_decrypt($input) {
108         openssl_private_decrypt(base64_decode($input),$output,$this->private_key_resource);
109         return $output;
110     }
111 }
112 
113 $rsa = new rsa('public_key.txt','private_key.txt');
114 
115 $str = '待加密字符';
116 $str = $rsa->public_encrypt($str); //用公密钥加密
117 echo $str,'</br>';
118 $str = $rsa->private_decrypt($str); //用私密钥解密
119 echo $str,'</br>';
120 //=============================================================
121 $str = $rsa->private_encrypt($str); //用丝密钥加密
122 echo $str,'</br>';
123 $str = $rsa->public_decrypt($str); //用公密钥解密
124 echo $str,'</br>';