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1. 在jar包中定义一个接口，例如 用于检查传入的hash值是否匹配预设的值。
2. 在调用接口的地方，获取当前应用的hash值。
3. 将当前应用的hash值与预设的值进行比较，如果匹配，则允许调用接口；否则，拒绝调用。
一、调用者
public static Impl getInstance(Context context, ICallback iCallback){if (instance == null){if (checkHashForInstance(context)) {instance = new Impl();}} else {throw new SecurityException("validation failed during instance creation.");}}return instance;}二、实现类
public class HashValidator {final static String whiltename ="com.xxx.xxxx";public static boolean checkHashForInstance(Context context) throws InsufficientPermissionException {// 获取当前应用的包名String packageName = context.getPackageName();// 计算包名的 HASH 值String calculatedHash = calculateHashFromPackageName(packageName);// 根据预设的 hash 值进行校验String presetHash = calculateHashFromPackageName(whiltename);Logs.d("package_name "+ packageName);if (!presetHash.equals(calculatedHash)) {// 校验失败，抛出自定义异常throw new InsufficientPermissionException("Insufficient permission during instance creation.");}// 校验成功return true;}private static String calculateHashFromPackageName(String packageName) {try {MessageDigest messageDigest = null;messageDigest = MessageDigest.getInstance("SHA-256");byte[] hashBytes = messageDigest.digest(packageName.getBytes());StringBuilder hexStringBuilder = new StringBuilder();// 将哈希字节数组转换为十六进制字符串for (byte hashByte : hashBytes) {hexStringBuilder.append(String.format("%02X", hashByte));}// 返回计算得到的哈希值return hexStringBuilder.toString();} catch (NoSuchAlgorithmException e) {e.printStackTrace();// 在实际应用中可能需要处理 NoSuchAlgorithmException 异常return null;}}
}