1.获取APK的签名信息
private String showUninstallAPKSignatures(String apkPath) {
String PATH_PackageParser = "android.content.pm.PackageParser";
try {
// apk包的文件路径
// 这是一个Package 解释器, 是隐藏的
// 构造函数的参数只有一个, apk文件的路径
// PackageParser packageParser = new PackageParser(apkPath);
Class pkgParserCls = Class.forName(PATH_PackageParser);
Class[] typeArgs = new Class[1];
typeArgs[0] = String.class;
Constructor pkgParserCt = pkgParserCls.getConstructor(typeArgs);
Object[] valueArgs = new Object[1];
valueArgs[0] = apkPath;
Object pkgParser = pkgParserCt.newInstance(valueArgs);
MediaApplication.logD(DownloadApk.class, "pkgParser:" + pkgParser.toString());
// 这个是与显示有关的, 里面涉及到一些像素显示等等, 我们使用默认的情况
DisplayMetrics metrics = new DisplayMetrics();
metrics.setToDefaults();
// PackageParser.Package mPkgInfo = packageParser.parsePackage(new
// File(apkPath), apkPath,
// metrics, 0);
typeArgs = new Class[4];
typeArgs[0] = File.class;
typeArgs[1] = String.class;
typeArgs[2] = DisplayMetrics.class;
typeArgs[3] = Integer.TYPE;
Method pkgParser_parsePackageMtd = pkgParserCls.getDeclaredMethod("parsePackage",
typeArgs);
valueArgs = new Object[4];
valueArgs[0] = new File(apkPath);
valueArgs[1] = apkPath;
valueArgs[2] = metrics;
valueArgs[3] = PackageManager.GET_SIGNATURES;
Object pkgParserPkg = pkgParser_parsePackageMtd.invoke(pkgParser, valueArgs);
typeArgs = new Class[2];
typeArgs[0] = pkgParserPkg.getClass();
typeArgs[1] = Integer.TYPE;
Method pkgParser_collectCertificatesMtd = pkgParserCls.getDeclaredMethod
("collectCertificates",
typeArgs);
valueArgs = new Object[2];
valueArgs[0] = pkgParserPkg;
valueArgs[1] = PackageManager.GET_SIGNATURES;
pkgParser_collectCertificatesMtd.invoke(pkgParser, valueArgs);
// 应用程序信息包, 这个公开的, 不过有些函数, 变量没公开
Field packageInfoFld = pkgParserPkg.getClass().getDeclaredField("mSignatures");
Signature[] info = (Signature[]) packageInfoFld.get(pkgParserPkg);
MediaApplication.logD(DownloadApk.class, "size:"+info.length);
MediaApplication.logD(DownloadApk.class, info[0].toCharsString());
return info[0].toCharsString();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
获取程序自身的签名：
private String getSign(Context context) {
PackageManager pm = context.getPackageManager();
List<PackageInfo> apps = pm.getInstalledPackages(PackageManager.GET_SIGNATURES);
Iterator<PackageInfo> iter = apps.iterator();
while(iter.hasNext()) {
PackageInfo packageinfo = iter.next();
String packageName = packageinfo.packageName;
if (packageName.equals(instance.getPackageName())) {
MediaApplication.logD(DownloadApk.class, packageinfo.signatures[0].toCharsString());
return packageinfo.signatures[0].toCharsString();
}
}
return null;
}
对比2个方法的返回值来判断APK升级包的签名是否一致，一致就提示可以安装。
2.获取指定已安装完整签名信息,包括MD5指纹：
public void getSingInfo() {
try {
PackageInfo packageInfo = getPackageManager().getPackageInfo("com.sina,weibo",
PackageManager.GET_SIGNATURES);
Signature[] signs = packageInfo.signatures;
Signature sign = signs[0];
parseSignature(sign.toByteArray());
} catch (Exception e) {
e.printStackTrace();
}
}
public void parseSignature(byte[] signature) {
try {
CertificateFactory certFactory = CertificateFactory.getInstance("X.509");
X509Certificate cert = (X509Certificate) certFactory.generateCertificate(new
ByteArrayInputStream(signature));
String pubKey = cert.getPublicKey().toString();
String signNumber = cert.getSerialNumber().toString();
System.out.println("signName:" + cert.getSigAlgName());
System.out.println("pubKey:" + pubKey);
System.out.println("signNumber:" + signNumber);
System.out.println("subjectDN:"+cert.getSubjectDN().toString());
} catch (CertificateException e) {
e.printStackTrace();
}
}
3.如何查看指定证书的指纹
D:>keytool -list -alias 在导出时程序的别名(-alias 这个命令，好像不用也行，没有试，反正我一直都在使用) -keystore tangshan.keystore(导出时使用的证书名称) -storepass 123456-keypass 123456
出的结果为：
在导出时程序的别名, 2011-7-29, PrivateKeyEntry,
认证指纹 (MD5)： 90:13:AF:46:0A:DC:5C:6C:77:0E:AA:AF:DA:8A:AB:72
获取 Apk 签名信息
首先在下载 「wandoujia-tools.jar」程序包到本地，在控制台输入诸如这行命令（无换行）
java -cp ~/Downloads/wandoujia-tools.jar com.wandoujia.tools.ApkSignatureToolsMain " ~/Downloads/youku.apk"
特别注意，其中粗体部分分别表示您下载的 wandoujia-tools.jar 所在目录和你想要分析的那个 Apk 的完整路径，其他部分不变。执行后会看到这样两句：
signatureMd5=b791ac2c93d279c4a52b6bcc68c5c32e
md5=b5ed58fa6fbb460c9b618fccfcc8cb37
分别表示签名 MD5 和文件 MD5 字符串。
