public async Task <string> GenerateAsync(string purpose, UserManager <TUser, TKey> manager, TUser user)
{
var twoFactAuthManager = manager as IUserManagerSupportsTwoFactorAuthStore <TUser, TKey>;
if (twoFactAuthManager == null)
{
throw new InvalidOperationException(Messages.IUserManagerSupportsTwoFactorAuthStoreNotImplemented);
}
if (!twoFactAuthManager.IsSupported())
{
throw new InvalidOperationException(Messages.ITwoFactorCodeStoreNotImplemented);
}
var stamp = await manager.GetSecurityStampAsync(user.Id);
purpose += stamp;
var bytes = Crypto.GenerateSaltInternal(sizeof(long));
var val = BitConverter.ToInt64(bytes, 0);
var mod = (int)Math.Pow(10, Digits);
val %= mod;
val = Math.Abs(val);
var code = val.ToString("D" + Digits);
var hasher = new AdaptivePasswordHasher(this.HashingIterations);
var hashedCode = hasher.HashPassword(purpose + code);
var data = new TwoFactorAuthData {
HashedCode = hashedCode, DateIssued = UtcNow
};
await twoFactAuthManager.SetTwoFactorAuthDataAsync(user, data);
await manager.UpdateAsync(user);
return(code);
}
Task IUserManagerSupportsTwoFactorAuthStore <TUser, TKey> .SetTwoFactorAuthDataAsync(TUser user, TwoFactorAuthData data)
{
var store = this.Store as ITwoFactorCodeStore <TUser, TKey>;
if (store == null)
{
throw new InvalidOperationException(Messages.ITwoFactorCodeStoreNotImplemented);
}
return(store.SetTwoFactorAuthDataAsync(user, data));
}