Android在代码中如何获取应用签名及sha1值

获得App签名文件的sha1值

/**
 * 获得App签名文件的sha1值
 *
 * @param context
 * @return
 */
public static String getAppSignSha1(Context context) {
    try {
        PackageManager packageManager = context.getPackageManager();
        PackageInfo packageInfo = packageManager.getPackageInfo(context.getPackageName(),
                PackageManager.GET_SIGNATURES);
        // X509证书，X.509是一种非常通用的证书格式
        Signature[] signs = packageInfo.signatures;
        Signature sign = signs[0];
        CertificateFactory certFactory = CertificateFactory.getInstance("X.509");
        X509Certificate cert = (X509Certificate) certFactory.generateCertificate(new ByteArrayInputStream(sign.toByteArray()));
        // sha1
        MessageDigest md = MessageDigest.getInstance("SHA1");
        // 获得公钥
        byte[] b = md.digest(cert.getEncoded());
        return bytes2HexFormatted(b);
    } catch (Exception e) {
        NLog.e(TAG, Log.getStackTraceString(e));
    }
    return "";
}

获得App签名文件的sha256值

/**
 * 获得App签名文件的sha256值
 *
 * @param context
 * @return
 */
public static String getAppSignSha256(Context context) {
    try {
        PackageManager packageManager = context.getPackageManager();
        PackageInfo packageInfo = packageManager.getPackageInfo(context.getPackageName(),
                PackageManager.GET_SIGNATURES);
        // X509证书，X.509是一种非常通用的证书格式
        Signature[] signs = packageInfo.signatures;
        Signature sign = signs[0];
        CertificateFactory certFactory = CertificateFactory.getInstance("X.509");
        X509Certificate cert = (X509Certificate) certFactory.generateCertificate(new ByteArrayInputStream(sign.toByteArray()));
        // sha1
        MessageDigest md = MessageDigest.getInstance("SHA256");
        // 获得公钥
        byte[] b = md.digest(cert.getEncoded());
        return bytes2HexFormatted(b);
    } catch (Exception e) {
        NLog.e(TAG, Log.getStackTraceString(e));
    }
    return "";
}

获得App签名文件的md5值

/**
 * 获得App签名文件的md5值
 *
 * @param context
 * @return
 */
public static String getAppSignMd5(Context context) {
    try {
        PackageManager packageManager = context.getPackageManager();
        //请注意需要PackageManager.GET_SIGNATURES 这个flag
        PackageInfo packageInfo = packageManager.getPackageInfo(context.getPackageName(),
                PackageManager.GET_SIGNATURES);
        Signature[] signs = packageInfo.signatures;
        Signature sign = signs[0];
        // X509证书，X.509是一种非常通用的证书格式
        CertificateFactory certFactory = CertificateFactory.getInstance("X.509");
        X509Certificate cert = (X509Certificate) certFactory
                .generateCertificate(new ByteArrayInputStream(sign.toByteArray()));
        // md5
        MessageDigest md = MessageDigest.getInstance("MD5");
        // 获得公钥
        byte[] b = md.digest(cert.getEncoded());
        //key即为应用签名
        return bytes2HexFormatted(b);
    } catch (PackageManager.NameNotFoundException e) {
        NLog.e(TAG, Log.getStackTraceString(e));
    } catch (CertificateException e) {
        NLog.e(TAG, Log.getStackTraceString(e));
    } catch (NoSuchAlgorithmException e) {
        NLog.e(TAG, Log.getStackTraceString(e));
    }
    return "";
}

字节数组16进制转换

/**
 * 将获取到得编码进行16进制转换
 *
 * @param arr
 * @return
 */
private static String bytes2HexFormatted(byte[] arr) {
    StringBuilder str = new StringBuilder(arr.length * 2);
    for (int i = 0; i < arr.length; i++) {
        String h = Integer.toHexString(arr[i]);
        int l = h.length();
        if (l == 1)
            h = "0" + h;
        if (l > 2)
            h = h.substring(l - 2, l);
        str.append(h.toUpperCase());
        if (i < (arr.length - 1))
            str.append(':');
    }
    return str.toString();
}