下面是一个Java方法,用于从APK签名分块中提取键值对的长度、key的长度和value的长度:

import java.io.FileInputStream;
import java.io.IOException;

public class ApkSignatureParser {
    public static void main(String[] args) {
        String apkPath = "path/to/apk/file.apk";
        parseApkSignature(apkPath);
    }

    public static void parseApkSignature(String apkPath) {
        try (FileInputStream fis = new FileInputStream(apkPath)) {
            byte[] buffer = new byte[4];
            int bytesRead = fis.read(buffer);

            while (bytesRead != -1) {
                int entryLength = byteArrayToInt(buffer);
                System.out.println("Entry Length: " + entryLength);

                bytesRead = fis.read(buffer);
                if (bytesRead == -1) {
                    break;
                }

                int keyLength = byteArrayToInt(buffer);
                System.out.println("Key Length: " + keyLength);

                bytesRead = fis.read(buffer);
                if (bytesRead == -1) {
                    break;
                }

                int valueLength = byteArrayToInt(buffer);
                System.out.println("Value Length: " + valueLength);

                // Skip to the next entry
                long skipped = fis.skip(entryLength - 4 - keyLength - valueLength);
                if (skipped != entryLength - 4 - keyLength - valueLength) {
                    throw new IOException("Error skipping to next entry.");
                }

                bytesRead = fis.read(buffer);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static int byteArrayToInt(byte[] bytes) {
        int value = 0;
        for (int i = 0; i < bytes.length; i++) {
            value |= (bytes[i] & 0xFF) << (8 * (bytes.length - 1 - i));
        }
        return value;
    }
}

请将 "path/to/apk/file.apk" 替换为你要解析的APK文件的实际路径。该方法使用FileInputStream从APK文件中读取字节,并将其转换为整数值。首先读取4个字节,以获取键值对的长度。然后再读取4个字节来获取key的长度,最后再读取4个字节来获取value的长度。然后,可以根据需要处理这些值。

请注意,该方法假设APK签名分块的格式是按照上述规定的长度进行编码的。如果APK签名分块的格式不符合该规定,可能需要进行相应的修改

写一个java方法从APK签名分块中找到键值对长度、key的长度固定4个字节、value的长度

原文地址: https://www.cveoy.top/t/topic/hLpo 著作权归作者所有。请勿转载和采集!

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