android 证书解析

    /**
     * 返回值是一个ArrayList<HashMap<String, String>> HashMap中的值通过 version取得版本号码
     * HashMap中的值通过 issuerDN取得特殊号码 afterPeriod获得有效期 startPeriod证书的开始日期
     * serialNumber证书的序列号 sigAlgName证书的签名 sigAlgOIDOID签名算法从证书 * @param filename2
     * 输入值：密码 password 输入流 要解析证书的输入流
     */
    public static ArrayList<HashMap<String, String>> readCertificateInformation(
            String password, InputStream input) {
        HashMap<String, String> hashMap;
        ArrayList<HashMap<String, String>> arrayList = new ArrayList<HashMap<String, String>>();
        try {
            InputStream inputStream = input;
            KeyStore keyStore = KeyStore.getInstance("bks");
            keyStore.load(inputStream, password.toCharArray());
            Enumeration<String> enumeration = keyStore.aliases();
            while (enumeration.hasMoreElements()) {
                String element = enumeration.nextElement();
                Certificate certificate = keyStore.getCertificate(element);
                X509Certificate X509certificates = X509Certificate
                        .getInstance(certificate.getEncoded());
                hashMap = new HashMap<String, String>();
                hashMap.put("version",
                        Integer.valueOf(X509certificates.getVersion())
                                .toString()); // 证书的版本号
                hashMap.put("issuerDN", X509certificates.getIssuerDN()
                        .toString());// 特殊的编号
                hashMap.put("afterPeriod", X509certificates.getNotAfter()
                        .toLocaleString());// 返回证书最后的有效期
                hashMap.put("startPeriod", X509certificates.getNotBefore()
                        .toLocaleString());// 返回证书的开始日期
                hashMap.put("serialNumber", X509certificates.getSerialNumber()
                        .toString());// 返回证书的序列号
                hashMap.put("sigAlgName", X509certificates.getSigAlgName()
                        .toString());// 返回证书的签名
                hashMap.put("sigAlgOID", X509certificates.getSigAlgOID()
                        .toString());// 返回OID签名算法从证书
                arrayList.add(hashMap);
            }
        } catch (Exception e) {
            new RuntimeException("证书异常，请稍后再试");
        }
        return arrayList;
    }