/// <summary>
/// Generate a setup code for a Google Authenticator user to scan
/// </summary>
/// <param name="issuer">Issuer ID (the name of the system, i.e. 'MyApp'), can be omitted but not recommended https://github.com/google/google-authenticator/wiki/Key-Uri-Format </param>
/// <param name="accountTitleNoSpaces">Account Title (no spaces)</param>
/// <param name="accountSecretKey">Account Secret Key as byte[]</param>
/// <param name="QRPixelsPerModule">Number of pixels per QR Module (2 = ~120x120px QRCode)</param>
/// <returns>SetupCode object</returns>
public SetupCode GenerateSetupCode(string issuer, string accountTitleNoSpaces, byte[] accountSecretKey, int QRPixelsPerModule)
{
if (accountTitleNoSpaces == null)
{
throw new NullReferenceException("Account Title is null");
}
accountTitleNoSpaces = RemoveWhitespace(accountTitleNoSpaces);
string encodedSecretKey = Base32Encoding.ToString(accountSecretKey);
string provisionUrl = null;
//otpauth://totp/Google:[email protected]?secret=xxxx&issuer=Google
provisionUrl = String.Format("otpauth://totp/{2}:{0}?secret={1}&issuer={2}", accountTitleNoSpaces, encodedSecretKey.Replace("=", ""), UrlEncode(issuer));
using (QRCodeGenerator qrGenerator = new QRCodeGenerator())
using (QRCodeData qrCodeData = qrGenerator.CreateQrCode(provisionUrl, QRCodeGenerator.ECCLevel.M))
using (QRCode qrCode = new QRCode(qrCodeData))
using (Bitmap qrCodeImage = qrCode.GetGraphic(QRPixelsPerModule))
using (MemoryStream ms = new MemoryStream())
{
qrCodeImage.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
return(new SetupCode(accountTitleNoSpaces, encodedSecretKey, String.Format("data:image/png;base64,{0}", Convert.ToBase64String(ms.ToArray()))));
}
}
/// <summary>
/// Generate a setup code for a Google Authenticator user to scan
/// </summary>
/// <param name="issuer">Issuer ID (the name of the system, i.e. 'MyApp'), can be omitted but not recommended https://github.com/google/google-authenticator/wiki/Key-Uri-Format </param>
/// <param name="accountTitleNoSpaces">Account Title (no spaces)</param>
/// <param name="accountSecretKey">Account Secret Key</param>
/// <param name="QRPixelsPerModule">Number of pixels per QR Module (2 pixels give ~ 100x100px QRCode)</param>
/// <returns>SetupCode object</returns>
public SetupCode GenerateSetupCode(string issuer, string accountTitleNoSpaces, string accountSecretKey, int QRPixelsPerModule)
{
//byte[] key = Encoding.UTF8.GetBytes(accountSecretKey);
byte[] key = Base32Encoding.ToBytes(accountSecretKey);
return(GenerateSetupCode(issuer, accountTitleNoSpaces, key, QRPixelsPerModule));
}
internal string GenerateHashedCode(string secret, long iterationNumber, int digits = 6)
{
// byte[] key = Encoding.UTF8.GetBytes(secret);
byte[] key = Base32Encoding.ToBytes(secret);
return(GenerateHashedCode(key, iterationNumber, digits));
}