온라인 SHA256 해시 생성기

I'm trying to generate a base64 hash based on two inputs - a message and a key, both being strings, using HMAC SHA256. I've spent hours looking for answers and did come across a few sites or other posts on Stack Overflow, but unfortunately none seem to be what I need.

Is it possible to code a function myself on VBA? I'm using Mac so those CreateObject commands I saw elsewhere won't be available.

Here is what I found so far that I think could be relevant - hope it helps others who are trying to achieve the same using other languages or Windows.

https://www.jokecamp.com/blog/examples-of-creating-base64-hashes-using-hmac-sha256-in-different-languages/#csharp

http://www.vbforums.com/showthread.php?635398-VB6-HMAC-SHA-256-HMAC-SHA-1-Using-Crypto-API

I am using CMake add_custom_command In a Util.cmake script to download a couple of files that will later be used in the build process. These files however may change and I would like to add a way to check the hash value of the local file against a provided value (within CMake) to decide if the file needs to be re-downloaded.

Currently, once the file has been downloaded, CMake will not consider re-downloading it, because the file already exists locally.

In the future, I want to provide a MD5 / SHA256 checksum of that file and make sure the local file is the corect one.

Here is what I am trying to do (this is just an concept example):

add_custom_command( OUTPUT ./file.dat    COMMAND wget ${FILE_PATH})if (opt_HASH)    add_custom_command(OUTPUT ${local_HASH}        COMMAND local_HASH=$(sha256sum ./file.dat)        DEPENDS ./file.dat    )    if (NOT ${opt_HASH} STREQUAL ${local_HASH})        # throw ERROR    endif()endif()

As you can see I only want to detect a mismatch right now and don't even want to auto-download the changed file. The opt_HASH is obviously provided through CMake, but what is important is that this call needs to depend on the file already being downloaded and I seem to be able to do that with a more simpler call to FILE().

PS: If it's somehow easier, I could also use MD5 over `SHA256.

I am trying to get my GDAX balance, but I think I can't handle the encoding/decoding properly in Java.The API reference is here: https://docs.gdax.com/#authentication, and the part I'm trying to do is under Accounts -> List Accounts (only have to scroll down a little bit from the above link) to just get the balance.

Here is the code that I have. I can't seem to get it working despite how much searching I've done on Google and here. I keep getting a 400 error from the server, meaning "Bad Request – Invalid request format".

    // Decode the secret key    byte[] decodedSecret;    try    {        decodedSecret = Base64.decode(SECRET_KEY);    }    catch (Base64DecodingException ex)    {        System.out.println("Failed to decode secret key.");        return null;    }    // Make the header parameters    long timestamp = (new GregorianCalendar()).getTimeInMillis() / 1000;    String preSign = "" + timestamp + "GET" + BASE_URL + "/accounts";    byte[] encodedhash;    try    {        Mac sha256_HMAC = Mac.getInstance("HmacSHA256");        try        {            sha256_HMAC.init(new SecretKeySpec(decodedSecret, "HmacSHA256"));        }        catch (InvalidKeyException ex)        {            System.out.println("Failed due to invalid key exception.");            System.out.println(ex.getMessage());            return null;        }        encodedhash = sha256_HMAC.doFinal(preSign.getBytes());    }    catch (NoSuchAlgorithmException ex)    {        System.out.println("Failed to make SHA-256 encode because of no such algorithm.");        return null;    }    HashMap<String, String> parameters = new HashMap<>();    parameters.put("CB-ACCESS-KEY", API_KEY);    parameters.put("CB-ACCESS-SIGN", Base64.encode(encodedhash));    parameters.put("CB-ACCESS-TIMESTAMP", "" + timestamp);    parameters.put("CB-ACCESS-PASSPHRASE", PASSPHRASE);    // Send the request    String response = sendGet(BASE_URL + "/accounts", parameters);

Here is the code I have inside sendGet() as well, in case that is where the problem is. I know it works without parameters, but I don't know if it uses the parameters properly or not since I can't get it to work.

    // Set up the connection    URL url = null;    try    {        url = new URL(urlStr);    }    catch (MalformedURLException ex)    {        return null;    }    HttpURLConnection con;    try    {        con = (HttpURLConnection) url.openConnection();    }    catch (IOException ex)    {        System.out.println("Returning null because of failure to open connection.");        return null;    }    try    {        con.setRequestMethod("GET");    }    catch (ProtocolException ex) {}    if (parameters != null) // if there are parameters to add to the connection    {        for (Map.Entry<String, String> pair : parameters.entrySet()) // for each pair in parameters        {            try            {                con.addRequestProperty(pair.getKey(), pair.getValue());            }            catch (Exception ex)            {                System.out.println("Failed to add " + pair.getKey() + ".");            }        }    }    // Get the response    int responseCode;    try    {        responseCode = con.getResponseCode();        BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));        StringBuilder responseBldr = new StringBuilder();        String line;        while ((line = in.readLine()) != null) // while we have read another line        {            responseBldr.append(line);        }        in.close();        return responseBldr.toString();    }    catch (IOException ex)    {        System.out.println("Returning null from network IOException.");        System.out.println(ex.getMessage());        return null;    }

Or, in general, any arbitrary number or bits that is not a multiple of 8.

According to hashlib.py there is one constructor method named for SHA256. Then I use sha256() to create a SHA256 hash object. I can now feed this object with arbitrary strings using the update() method, and at any point I can ask it for the digest of the concatenation of the strings fed to it so far using the digest() or hexdigest() methods.

Well. I would like to feed 1 bit to SHA256 in line with this link "What is the SHA-256 hash of a single '1' bit?"

In Python 2.7, of course.

So, what is the procedure to hash 1-bit long input consisting of the bit "1"? (not the 8-bit long byte[] { 1 } input)?

I can generate signed SHA1 APK on Android Studio and also can convert to SHA256 APK using jarsigner and zipalign 4, which is a 2 steps solution.

Is there any way to build SHA256 APK, same as SHA1 with android studio or any gradlew command depends on gradle configutaion.

Thanks in advance