详解Android使用Socket对大文件进行加密传输

 //秘钥算法 private static final String KEY_ALGORITHM = "DES"; //加密算法：algorithm/mode/padding 算法/工作模式/填充模式 private static final String CIPHER_ALGORITHM = "DES/ECB/PKCS5Padding"; //秘钥 private static final String KEY = "12345678";//DES秘钥长度必须是8位 public static void main(String args[]) {  String data = "加密解密";  KLog.d("加密数据：" + data);  byte[] encryptData = encrypt(data.getBytes());  KLog.d("加密后的数据：" + new String(encryptData));  byte[] decryptData = decrypt(encryptData);  KLog.d("解密后的数据：" + new String(decryptData)); } public static byte[] encrypt(byte[] data) {  //初始化秘钥  SecretKey secretKey = new SecretKeySpec(KEY.getBytes(), KEY_ALGORITHM);  try {   Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);   cipher.init(Cipher.ENCRYPT_MODE, secretKey);   byte[] result = cipher.doFinal(data);   return Base64.getEncoder().encode(result);  } catch (Exception e) {   e.printStackTrace();  }  return null; } public static byte[] decrypt(byte[] data) {  byte[] resultBase64 = Base64.getDecoder().decode(data);  SecretKey secretKey = new SecretKeySpec(KEY.getBytes(), KEY_ALGORITHM);  try {   Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);   cipher.init(Cipher.DECRYPT_MODE, secretKey);   byte[] result = cipher.doFinal(resultBase64);   return result;  } catch (Exception e) {   e.printStackTrace();  }  return null; }