Android获取应用的签名信息

public void getSingInfo() {
		try {
			PackageInfo packageInfo = getPackageManager().getPackageInfo(
					"wabao.et.master", 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();
		} catch (CertificateException e) {
			e.printStackTrace();
		}
	}