1.获取APK的签名信息

01	private String showUninstallAPKSignatures(String apkPath) {

02	String PATH_PackageParser = "android.content.pm.PackageParser";

03

try {

04	// apk包的文件路径

05	// 这是一个Package 解释器, 是隐藏的

06	// 构造函数的参数只有一个, apk文件的路径

07	// PackageParser packageParser = new PackageParser(apkPath);

08	Class pkgParserCls = Class.forName(PATH_PackageParser);

09	Class[] typeArgs = new Class[1];

10	typeArgs[0] = String.class;

11	Constructor pkgParserCt = pkgParserCls.getConstructor(typeArgs);

12	Object[] valueArgs = new Object[1];

13	valueArgs[0] = apkPath;

14	Object pkgParser = pkgParserCt.newInstance(valueArgs);

15	MediaApplication.logD(DownloadApk.class, "pkgParser:" + pkgParser.toString());

16	// 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

17	DisplayMetrics metrics = new DisplayMetrics();

18	metrics.setToDefaults();

19	// PackageParser.Package mPkgInfo = packageParser.parsePackage(new

20	// File(apkPath), apkPath,

21	// metrics, 0);

22	typeArgs = new Class[4];

23	typeArgs[0] = File.class;

24	typeArgs[1] = String.class;

25	typeArgs[2] = DisplayMetrics.class;

26	typeArgs[3] = Integer.TYPE;

27	Method pkgParser_parsePackageMtd = pkgParserCls.getDeclaredMethod("parsePackage",

28	typeArgs);

29	valueArgs = new Object[4];

30	valueArgs[0] = new File(apkPath);

31	valueArgs[1] = apkPath;

32	valueArgs[2] = metrics;

33	valueArgs[3] = PackageManager.GET_SIGNATURES;

34	Object pkgParserPkg = pkgParser_parsePackageMtd.invoke(pkgParser, valueArgs);

35

36	typeArgs = new Class[2];

37	typeArgs[0] = pkgParserPkg.getClass();

38	typeArgs[1] = Integer.TYPE;

39	Method pkgParser_collectCertificatesMtd = pkgParserCls.getDeclaredMethod("collectCertificates",

40	typeArgs);

41	valueArgs = new Object[2];

42	valueArgs[0] = pkgParserPkg;

43	valueArgs[1] = PackageManager.GET_SIGNATURES;

44	pkgParser_collectCertificatesMtd.invoke(pkgParser, valueArgs);

45	// 应用程序信息包, 这个公开的, 不过有些函数, 变量没公开

46	Field packageInfoFld = pkgParserPkg.getClass().getDeclaredField("mSignatures");

47	Signature[] info = (Signature[]) packageInfoFld.get(pkgParserPkg);

48	MediaApplication.logD(DownloadApk.class, "size:"+info.length);

49	MediaApplication.logD(DownloadApk.class, info[0].toCharsString());

50	return info[0].toCharsString();

51	} catch (Exception e) {

52	e.printStackTrace();

53

}

54	return null;

55

}

获取程序自身的签名：

01	private String getSign(Context context) {

02	PackageManager pm = context.getPackageManager();

03	List<PackageInfo> apps = pm.getInstalledPackages(PackageManager.GET_SIGNATURES);

04	Iterator<PackageInfo> iter = apps.iterator();

05	while(iter.hasNext()) {

06	PackageInfo packageinfo = iter.next();

07	String packageName = packageinfo.packageName;

08	if (packageName.equals(instance.getPackageName())) {

09	MediaApplication.logD(DownloadApk.class, packageinfo.signatures[0].toCharsString());

10	return packageinfo.signatures[0].toCharsString();

11

}

12

}

13	return null;

14

}

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：

01	public void getSingInfo() {

02

try {

03	PackageInfo packageInfo = getPackageManager().getPackageInfo("com.sina,weibo", PackageManager.GET_SIGNATURES);

04	Signature[] signs = packageInfo.signatures;

05	Signature sign = signs[0];

06	parseSignature(sign.toByteArray());

07	} catch (Exception e) {

08	e.printStackTrace();

09

}

10

}

11	public void parseSignature(byte[] signature) {

12

try {

13	CertificateFactory certFactory = CertificateFactory.getInstance("X.509");

14	X509Certificate cert = (X509Certificate) certFactory.generateCertificate(new ByteArrayInputStream(signature));

15	String pubKey = cert.getPublicKey().toString();

16	String signNumber = cert.getSerialNumber().toString();

17	System.out.println("signName:" + cert.getSigAlgName());

18	System.out.println("pubKey:" + pubKey);

19	System.out.println("signNumber:" + signNumber);

20	System.out.println("subjectDN:"+cert.getSubjectDN().toString());

21	} catch (CertificateException e) {

22	e.printStackTrace();

23

}

24

}

3.如何查看指定证书的指纹

1	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

2

3

出的结果为：

4

5	在导出时程序的别名, 2011-7-29, PrivateKeyEntry,

6

7	认证指纹 (MD5)： 90:13:AF:46:0A:DC:5C:6C:77:0E:AA:AF:DA:8A:AB:72