和PHP通用的 DES 加解密类

向右看齐 2023-08-17 15:38 53阅读 0赞

// 以DES-CBC模式, pkcs5填充为例
    import java.io.UnsupportedEncodingException;
    import java.security.InvalidAlgorithmParameterException;
    import java.security.InvalidKeyException;
    import java.security.Key;
    import java.security.NoSuchAlgorithmException;
    import java.util.Base64;
    import java.util.Base64.Decoder;
    import java.util.Base64.Encoder;
    import java.util.Collections;
    import javax.crypto.BadPaddingException;
    import javax.crypto.Cipher;
    import javax.crypto.IllegalBlockSizeException;
    import javax.crypto.NoSuchPaddingException;
    import javax.crypto.spec.IvParameterSpec;
    import javax.crypto.spec.SecretKeySpec;
    public class DesUtil
    {    
        public static void main(String[] args)
        {
            DesUtil des = new DesUtil();
            String res = des.encrypt("adminuser", "1234567", "asdfzxcv");
            System.out.println("密文:");
            System.out.println(res);
            String plaintext = des.decrypt(res, "1234567", "asdfzxcv");
            System.out.println("明文: ");
            System.out.println(plaintext);
        }
    
        /**
         * 
         * @param plaintext 待加密数据
         * @param key 密钥, 8字节字符串
         * @param iv 初始化随机向量参数,des模式下是长度8个字节的字符串.Java中不指定该参数时, 会使用随机参数加密. php中不使用该参数是, 会抛出警告, 但仍然可以加密
         * @return
         */
        public String encrypt(String plaintext, String key, String iv)
        {
            String result = null;
            try 
            {
                // iv对象
                IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes("UTF-8"));
                // 创建密钥对象. 长度不足8个字节时手动补0. 在密钥长度不足时, Java会自动补0, php会自动补\0, 这可能导致加密结果不同
                byte[] nk = new byte[8];
                if(key.getBytes("UTF-8").length < 8)
                {
                    int sub = 8 - key.getBytes("UTF-8").length;
                    nk = (key + String.join("", Collections.nCopies(sub, 0 + ""))).getBytes("UTF-8");
                }else
                {
                    nk = key.getBytes("UTF-8");
                }
                Key sKey = new SecretKeySpec(nk, "DES");
                // 加解密服务类
                Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
                // 指定进行加密
                cipher.init(Cipher.ENCRYPT_MODE, sKey,ivSpec);
                // 执行加密
                byte[] ciphertext = cipher.doFinal(plaintext.getBytes("UTF-8"));
                // 返回base64编码过的字符串
                Encoder encoder = Base64.getEncoder();
                result = encoder.encodeToString(ciphertext);
            } catch (NoSuchAlgorithmException e) 
            {
                e.printStackTrace();
            } catch (NoSuchPaddingException e) 
            {
                e.printStackTrace();
            } catch (IllegalBlockSizeException e) 
            {
                e.printStackTrace();
            } catch (BadPaddingException e) 
            {
                e.printStackTrace();
            } catch (InvalidKeyException e) 
            {
                e.printStackTrace();
            }catch(Exception e)
            {
                e.printStackTrace();
            }
            return result;
        }
        
        public String decrypt(String cipherText, String key, String iv)
        {
            String result = null;
            Decoder decoder = Base64.getDecoder();
            byte[] cipherByte = decoder.decode(cipherText);
            try 
            {
                IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes("UTF-8"));
                byte[] nk = new byte[8];
                if(key.getBytes("UTF-8").length < 8)
                {
                    int sub = 8 - key.getBytes("UTF-8").length;
                    nk = (key + String.join("", Collections.nCopies(sub, 0 + ""))).getBytes("UTF-8");
                }else
                {
                    nk = key.getBytes("UTF-8");
                }
                Key sKey = new SecretKeySpec(nk, "DES");
                Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
                cipher.init(Cipher.DECRYPT_MODE, sKey, ivSpec);
                byte[] plaintext = cipher.doFinal(cipherByte);
                result = new String(plaintext);
            }catch(UnsupportedEncodingException e)
            {
                e.printStackTrace();
            }catch (NoSuchPaddingException e) 
            {
                e.printStackTrace();
            }catch (NoSuchAlgorithmException e) 
            {
                e.printStackTrace();
            }catch (InvalidAlgorithmParameterException e) 
            {
                e.printStackTrace();
            }catch (InvalidKeyException e)
            {
                e.printStackTrace();
            }catch (BadPaddingException e) 
            {
                e.printStackTrace();
            }catch (IllegalBlockSizeException e) 
            {
                e.printStackTrace();
            }
            
            return result;
        }
    }

与之对应的 PHP 加解密:

class DES
    {
        public function encrypt($plaintext, $key, $iv)
        {
            // 此处采用java的填充规则
            if(strlen($key) < 8)
            {
                $key = $key . str_repeat('0', 8 - strlen($key));
            }
            // 第四个参数设为0, 返回自动填充, 且已经过base64编码都密文
            $ciphertext = openssl_encrypt($plaintext, 'des-cbc', $key, 0, $iv);
            return $ciphertext;
        }
    
        public function decrypt($ciphertext, $key, $iv)
        {
            if(strlen($key) < 8)
            {
                $key = $key . str_repeat('0', 8 - strlen($key));
            }
            // 解密数据
            $plaintext = openssl_decrypt($ciphertext, 'des-cbc', $key, 0, $iv);
            return $plaintext;
        }
    }

转载于:https://www.cnblogs.com/fxyy/p/11279489.html