详解PHP使用非对称加密算法RSA

<?php
 
 
class Rsa {
 
    /**     
     * 获取私钥     
     * @return bool|resource     
     */    
    private static function getPrivateKey() 
    {        
        $abs_path = dirname(__FILE__) . '/rsa_private_key.pem';
        $content = file_get_contents($abs_path);    
        return openssl_pkey_get_private($content);    
    }    
 
    /**     
     * 获取公钥     
     * @return bool|resource     
     */    
    private static function getPublicKey()
    {   
        $abs_path = dirname(__FILE__) . '/rsa_public_key.pem';
        $content = file_get_contents($abs_path);    
        return openssl_pkey_get_public($content);     
    }
 
    /**     
     * 私钥加密     
     * @param string $data     
     * @return null|string     
     */    
    public static function privEncrypt($data = '')    
    {        
        if (!is_string($data)) {            
            return null;       
        }        
        return openssl_private_encrypt($data,$encrypted,self::getPrivateKey()) ? base64_encode($encrypted) : null;    
    }    
 
    /**     
     * 公钥加密     
     * @param string $data     
     * @return null|string     
     */    
    public static function publicEncrypt($data = '')   
    {        
        if (!is_string($data)) {            
            return null;        
        }        
        return openssl_public_encrypt($data,$encrypted,self::getPublicKey()) ? base64_encode($encrypted) : null;    
    }    
 
    /**     
     * 私钥解密     
     * @param string $encrypted     
     * @return null     
     */    
    public static function privDecrypt($encrypted = '')    
    {        
        if (!is_string($encrypted)) {            
            return null;        
        }        
        return (openssl_private_decrypt(base64_decode($encrypted), $decrypted, self::getPrivateKey())) ? $decrypted : null;    
    }    
 
    /**     
     * 公钥解密     
     * @param string $encrypted     
     * @return null     
     */    
    public static function publicDecrypt($encrypted = '')    
    {        
        if (!is_string($encrypted)) {            
            return null;        
        }        
    return (openssl_public_decrypt(base64_decode($encrypted), $decrypted, self::getPublicKey())) ? $decrypted : null;    
    }
}

<?php
require_once "Rsa.php";
$rsa = new Rsa();
$data['name'] = 'Tom';
$data['age']  = '20';
$privEncrypt = $rsa->privEncrypt(json_encode($data));
echo '私钥加密后:'.$privEncrypt.'<br>';
 
$publicDecrypt = $rsa->publicDecrypt($privEncrypt);
echo '公钥解密后:'.$publicDecrypt.'<br>';
 
$publicEncrypt = $rsa->publicEncrypt(json_encode($data));
echo '公钥加密后:'.$publicEncrypt.'<br>';
 
$privDecrypt = $rsa->privDecrypt($publicEncrypt);
echo '私钥解密后:'.$privDecrypt.'<br>';