Android 获取签名、公钥方法

private byte[] getSign(Context context) {
		PackageManager pm = context.getPackageManager();
		List<PackageInfo> apps = pm
				.getInstalledPackages(PackageManager.GET_SIGNATURES);
		Iterator<PackageInfo> iter = apps.iterator();

		while (iter.hasNext()) {
			PackageInfo info = iter.next();
			String packageName = info.packageName;
			//按包名 取签名
			if (packageName.equals("com.test.test")) {
				return info.signatures[0].toByteArray();
				
			} 
		}
		return null;
	}


public static String getPublicKey(byte[] signature) {
		try {

			CertificateFactory certFactory = CertificateFactory
					.getInstance("X.509");
			X509Certificate cert = (X509Certificate) certFactory
					.generateCertificate(new ByteArrayInputStream(signature));

			String publickey = cert.getPublicKey().toString();
			publickey = publickey.substring(publickey.indexOf("modulus: ") + 9,
					publickey.indexOf("\n", publickey.indexOf("modulus:")));

			Log.d("TRACK", publickey);
			return publickey;
		} catch (CertificateException e) {
			e.printStackTrace();
		}
		return null;
	}
	


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