国密 SM4 文件加解密

2022-06-21 00:00:00 文件 加解密 国密

国密算法SM4 对文件加解密

说明:调用开源bcprov-jdk15on 加密算法工具,使用SM4算法,对文件进行加密、解密;文件流的操作使用hutool工具包来实现。

  • 引用依赖

            <dependency>
                <groupId>org.bouncycastle</groupId>
                <artifactId>bcprov-jdk15on</artifactId>
                <version>1.54</version>
            </dependency>
    
            <!-- hutool 工具包 -->
            <dependency>
                <groupId>cn.hutool</groupId>
                <artifactId>hutool-all</artifactId>
                <version>4.6.10</version>
            </dependency>
    
  • 生成128位的Key

    public static final int KEY_SIZE = 128;    
    
    public static byte[] generateKey(int keySize) throws Exception { 
            KeyGenerator kg = KeyGenerator.getInstance(ALGORITHM_NAME, BouncyCastleProvider.PROVIDER_NAME);
            kg.init(keySize, new SecureRandom());
            return kg.generateKey().getEncoded();
        }
    
  • 生成密钥

        public static void main(String[] args) throws Exception { 
    
            //生成Key
            byte[] bytes = generateKey(KEY_SIZE);
            String key = ByteUtils.toHexString(bytes);
            System.out.println("密钥:");
            System.out.println(key);
        }
    
  • 文件加密、解密,贴上完整的可执行的代码

    public class SM4FileEncrypt { 
        static{ 
            if (Security.getProvider(BouncyCastleProvider.PROVIDER_NAME) == null){ 
                //No such provider: BC
                Security.addProvider(new BouncyCastleProvider());
            }
        }
    
        //生成 Cipher
        public static Cipher generateCipher(int mode,byte[] keyData) throws InvalidKeyException, NoSuchPaddingException, NoSuchAlgorithmException, NoSuchProviderException { 
            Cipher cipher = Cipher.getInstance("SM4/ECB/PKCS5Padding", BouncyCastleProvider.PROVIDER_NAME);
            Key sm4Key = new SecretKeySpec(keyData, "SM4");
            cipher.init(mode, sm4Key);
            return cipher;
        }
    
    
        //加密文件
        public static void encryptFile(byte[] keyData,String sourcePath,String targetPath){ 
            //加密文件
            try { 
                Cipher cipher = generateCipher(Cipher.ENCRYPT_MODE,keyData);
                CipherInputStream cipherInputStream = new CipherInputStream(new FileInputStream(sourcePath), cipher);
                FileUtil.writeFromStream(cipherInputStream, targetPath);
                IoUtil.close(cipherInputStream);
            } catch (InvalidKeyException e) { 
                e.printStackTrace();
            } catch (NoSuchPaddingException e) { 
                e.printStackTrace();
            } catch (NoSuchAlgorithmException e) { 
                e.printStackTrace();
            } catch (NoSuchProviderException e) { 
                e.printStackTrace();
            } catch (FileNotFoundException e) { 
                e.printStackTrace();
            }
        }
    
    
      /** * 解密文件 * @param sourcePath 待解密的文件路径 * @param targetPath 解密后的文件路径 */
      public static void decryptFile(byte[] keyData,String sourcePath, String targetPath) { 
          FileInputStream in =null;
          ByteArrayInputStream byteArrayInputStream =null;
          OutputStream out = null;
          CipherOutputStream cipherOutputStream=null;
          try { 
              in = new FileInputStream(sourcePath);
              byte[] bytes = IoUtil.readBytes(in);
              byteArrayInputStream = IoUtil.toStream(bytes);
    
               Cipher cipher = generateCipher(Cipher.DECRYPT_MODE,keyData);
    
              out = new FileOutputStream(targetPath);
              cipherOutputStream = new CipherOutputStream(out, cipher);
              IoUtil.copy(byteArrayInputStream, cipherOutputStream);
          } catch (IOException e) { 
              e.printStackTrace();
          } catch (NoSuchPaddingException e) { 
              e.printStackTrace();
          } catch (NoSuchAlgorithmException e) { 
              e.printStackTrace();
          } catch (InvalidKeyException e) { 
              e.printStackTrace();
          } catch (NoSuchProviderException e) { 
              e.printStackTrace();
          }finally { 
              IoUtil.close(cipherOutputStream);
              IoUtil.close(out);
              IoUtil.close(byteArrayInputStream);
              IoUtil.close(in);
          }
      }
    
        public static void main(String[] args) throws Exception { 
    
            String sp = "E:\\bjsasc\\文件加解密\\原始文件.docx";//原始文件
            String dp = "E:\\bjsasc\\文件加解密\\加密文件.docx";//加密后文件
            String dp2 = "E:\\bjsasc\\文件加解密\\解密文件.docx";//解密后文件
    
            String key = "05d986b1141227cb20d46d0b5687c4f5";
            byte[] keyData = ByteUtils.fromHexString(key);
            //加密文件
            encryptFile(keyData,sp,dp);
    
            //解密文件
            decryptFile(keyData,dp,dp2);
        }
    }
    
    原文作者:d_dreamer
    原文地址: https://blog.csdn.net/dhq779626019/article/details/105535119
    本文转自网络文章,转载此文章仅为分享知识,如有侵权,请联系博主进行删除。

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