Online SHA256 Hash Generator

I have a Java method that I need to implement in PHP. It is to create an authentication string to gain access to an API. It consists of a code given by the company as well as an API key, also given by the company, and, according to the Java example below, it also includes a GMT timestamp in minutes since epoch.

According to the documentation it says "The timestamp calculated as the number of minutes passed since epoch. A GMT time zone must be used for calculating the timestamp. If the system time of a requesting server is off by more than one minute from actual current time , the call will be rejected by the server with a 400 Bad Request code".

I have to provide as parameters the code as well as the SHA-256 encrypted token that I create.

Here is the Java:

String createToken() {    String token = "";    MessageDigest lclMD = null;    try {        lclMD = MessageDigest.getInstance("SHA-256"); }    catch (NoSuchAlgorithmException e) {        e.printStackTrace();    }    lclMD.update((EnvConstants.code + EnvConstants.api_key + Long.toString(getEpochMinutes())).getBytes());    byte[] lclResult = lclMD.digest();    sig = new String(Hex.encodeHex(lclResult));    return token; }long getEpochMinutes () {    Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("GMT"));     long now = System.currentTimeMillis();    cal.setTimeInMillis(now);    return (cal.getTimeInMillis() / 60000L); }

This is what I have tried in PHP:

$time = (string)time()/60;   // to get the minutes since epoch, I have also tried it not casting it to a string$code = 'thisisthecode';$api_key = 'XXXXXXX';$hash = hash('sha256', $code . $api_key . $time);$curl = curl_init();$url = "http://api.url/user/XXXX?code=thisisthecode&token=$hash"; curl_setopt($curl, CURLOPT_URL, $url);$result = curl_exec($curl);return $result;

When I run this code I always get a 400 Bad Request error.

To be clear, I don't know Java and now I'm guessing if I know PHP well enough because I can't get this to work.

Can anyone help me out with this? I'm banging my head against the concrete.

Thank you for any and all help.

I have the following question, I need to make a project in windows forms that consults data of an SQL database that was generated by Entity Framework, so I am trying to compare passwords between the one that I enter by WF with the one I have in the database, the The question is that EF encrypts the password data and therefore if I have to compare it then, I need to decrypt it. This is an assumption, there is no other way to compare this data. And this is the code I have

public partial class MainWindow : Window{    private Models.SecurityController _security;    public MainWindow()    {        InitializeComponent();        _security = new Models.SecurityController();    }    private void Button_Click(object sender, RoutedEventArgs e)    {        var email = EmailInput.Text;        var pass = PassInput.Password;        email = email.Replace(" ", "");        if (email == "" )        {            EmailInput.Focus();            Errorlbl.Content = "Por favor utiliza un mail valido";        }        else if (pass == "")        {            PassInput.Focus();            Errorlbl.Content = "Por favor utiliza una contraseña";        }        else if (email != null && pass != null)        {            using (DBEnt db = new DBEnt())            {                var item = db.AspNetUsers.Where(u => u.Email.Equals(email)).FirstOrDefault();                if (item == null)                {                    Errorlbl.Content = "Usuario mail invalido";                }                else {                    Errorlbl.Content = "Usuario valido";                }                var query =                db.AspNetUsers.Where(u => u.Email.Equals(email)).FirstOrDefault();                var hashedpassword = query.PasswordHash;                var unhashed = _security.Decrypt(pass, hashedpassword);            }        }    }}

up to this point hashedpassword returns menull

And all this is the SecurityController class

class SecurityController{    public string Encrypt(string key, string data)    {        string encData = null;        byte[][] keys = GetHashKeys(key);        try        {            encData = EncryptStringToBytes_Aes(data, keys[0], keys[1]);        }        catch (CryptographicException) { }        catch (ArgumentNullException) { }        return encData;    }    public string Decrypt(string key, string data)    {        string decData = null;        byte[][] keys = GetHashKeys(key);        try        {            decData = DecryptStringFromBytes_Aes(data, keys[0], keys[1]);        }        catch (CryptographicException) { }        catch (ArgumentNullException) { }        return decData;    }    private byte[][] GetHashKeys(string key)    {        byte[][] result = new byte[2][];        Encoding enc = Encoding.UTF8;        SHA256 sha2 = new SHA256CryptoServiceProvider();        byte[] rawKey = enc.GetBytes(key);        byte[] rawIV = enc.GetBytes(key);        byte[] hashKey = sha2.ComputeHash(rawKey);        byte[] hashIV = sha2.ComputeHash(rawIV);        Array.Resize(ref hashIV, 16);        result[0] = hashKey;        result[1] = hashIV;        return result;    }    //source: https://msdn.microsoft.com/de-de/library/system.security.cryptography.aes(v=vs.110).aspx    private static string EncryptStringToBytes_Aes(string plainText, byte[] Key, byte[] IV)    {        if (plainText == null || plainText.Length <= 0)            throw new ArgumentNullException("plainText");        if (Key == null || Key.Length <= 0)            throw new ArgumentNullException("Key");        if (IV == null || IV.Length <= 0)            throw new ArgumentNullException("IV");        byte[] encrypted;        using (AesManaged aesAlg = new AesManaged())        {            aesAlg.Key = Key;            aesAlg.IV = IV;            ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);            using (MemoryStream msEncrypt = new MemoryStream())            {                using (CryptoStream csEncrypt =                        new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))                {                    using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))                    {                        swEncrypt.Write(plainText);                    }                    encrypted = msEncrypt.ToArray();                }            }        }        return Convert.ToBase64String(encrypted);    }    //source: https://msdn.microsoft.com/de-de/library/system.security.cryptography.aes(v=vs.110).aspx    private static string DecryptStringFromBytes_Aes(string cipherTextString, byte[] Key, byte[] IV)    {        byte[] cipherText = Convert.FromBase64String(cipherTextString);        if (cipherText == null || cipherText.Length <= 0)            throw new ArgumentNullException("cipherText");        if (Key == null || Key.Length <= 0)            throw new ArgumentNullException("Key");        if (IV == null || IV.Length <= 0)            throw new ArgumentNullException("IV");        string plaintext = null;        using (Aes aesAlg = Aes.Create())        {            aesAlg.Key = Key;            aesAlg.IV = IV;            ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);            using (MemoryStream msDecrypt = new MemoryStream(cipherText))            {                using (CryptoStream csDecrypt =                        new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))                {                    using (StreamReader srDecrypt = new StreamReader(csDecrypt))                    {                        plaintext = srDecrypt.ReadToEnd();                    }                }            }        }        return plaintext;    }}

Maybe I'm getting very complicated, does anyone know how I can do this better or if I'm doing well?

Good afternoon everyone,

I am seeking information on how to generate a content hash using HMAC/SHA156. I am very new to coding and would appreciate any feedback.

BTW- This content hash is required to call my external api function through my wix.com website but I am unsure of how to generate this code.

I am trying to generate the fingerprint form Public Key (PK) to SHA-256, using the command as:

ssh-keygen -lf C:/Users/UserName/.ssh/pk.asc. But got the error as:

C:/Users/UserName/.ssh/pk.asc is not a public key file.

I have generated the PublicKey using: GPG4Win, GNU privacy assistant Key Manger

Public Key Details:

Public key format:

Why is the ssh-keygen not recongnizing the generated public key. What might i am doing wrong while exporting Public Key from the GPG application?

How does openssl perform hashing on stdin when multiple inputs are provided?

For example if the command entered is:
openssl {enter}
sha256 {enter}
foo {enter}
bar {enter}
foobar {enter}
ctrl + d

The resulting hash I'm receiving is 3e76042553dc7a71401dea0cd9b0b38b but that doesn't match any of the hashes that result from the individual words themselves when run separately.

foo - d3b07384d113edec49eaa6238ad5ff00
bar - c157a79031e1c40f85931829bc5fc552
foobar - 14758f1afd44c09b7992073ccf00b43d

How does that work?