Imports System.Security.Cryptography
Imports Microsoft.VisualBasic
Imports Konscious.Security.Cryptography
Imports System.Threading.Tasks
Imports System.Web.Script.Services
Imports System.Web.Services
Imports System.Management

Public Class VERAG_VARIABLES
    Public Shared errornumb As Integer = 0
    Public Shared Function GetCpuSpeed() As UInteger
        Dim managementObject = New ManagementObject("Win32_Processor.DeviceID='CPU0'")
        Dim speed As UInteger = CUInt(managementObject("CurrentClockSpeed"))
        managementObject.Dispose()
        Return speed
    End Function
    Public Shared Function GetMaxCpuSpeed() As UInteger
        Dim managementObject = New ManagementObject("Win32_Processor.DeviceID='CPU0'")
        Dim speed As UInteger = CUInt(managementObject("MaxClockSpeed"))
        managementObject.Dispose()
        Return speed
    End Function
    Shared Function getiterationnumber() As Integer
        If HttpContext.Current.Request.ServerVariables("SERVER_NAME") = "localhost" Then
            Return RandomInteger(Math.Pow(2, 2), (0.35 * GetCpuSpeed()))
        Else
            Return RandomInteger(Math.Pow(2, 5), (0.34 * GetCpuSpeed()))
        End If
    End Function

    Shared Sub initerrorcount()
        errornumb = 0
    End Sub
    Shared Sub seterrorcount(var As Integer)
        errornumb = var
    End Sub
    Shared Function geterrornumb() As String
        Return Environment.NewLine + "Error:" + Space(1) + VERAG_PROG_ALLGEMEIN.cCryptography3.Encrypt(errornumb.ToString) + Space(1)
    End Function
    Shared Function getErrorcodeindez(Errorcode As String) As String
        Return VERAG_PROG_ALLGEMEIN.cCryptography3.Decrypt(Errorcode)
    End Function
    Public Shared Function GenerateSalt(ByVal nSalt As Integer) As Byte()
        Dim saltBytes = New Byte(nSalt) {}
        Using provider = New RNGCryptoServiceProvider()
            provider.GetNonZeroBytes(saltBytes)
        End Using
        Return saltBytes
        'Convert.ToBase64String(saltBytes)
    End Function

    Public Shared Function HashPassword(password As String, salt As Byte(), nIterations As Integer, nHash As Integer) As Byte()
        'Dim Argon As Argon2id = New Argon2id(Encoding.UTF8.GetBytes(password))

        If HttpContext.Current.Request.ServerVariables("SERVER_NAME") = "localhost" Then
            Dim Argon As Argon2id = New Argon2id(Encoding.UTF8.GetBytes(VERAG_PROG_ALLGEMEIN.cCryptography3.Encrypt(password)))
            Argon.Salt = salt
            Argon.DegreeOfParallelism = 8
            Argon.Iterations = nIterations * VERAG_VARIABLES.RandomInteger(2, 3)
            Argon.MemorySize = (((nIterations * 19.98 - (nIterations * 10.23) / 14 * 2) / 4.058) + 1 * 190)
            'Argon.MemorySize = Encoding.UTF8.GetBytes(VERAG_PROG_ALLGEMEIN.cCryptography3.Encrypt(password)).Length
            Return Argon.GetBytes(nHash)
        Else
            Dim Argon As Argon2id = New Argon2id(Encoding.UTF8.GetBytes(VERAG_PROG_ALLGEMEIN.cCryptography3.Encrypt(password)))
            Argon.Salt = salt
            Argon.DegreeOfParallelism = 10
            Argon.Iterations = nIterations * VERAG_VARIABLES.RandomInteger(2, 3)
            Argon.MemorySize = (((nIterations * 20.98 - (nIterations * 10.23) / 14 * 2) / 4.058) + 1 * 190)
            'Argon.MemorySize = Encoding.UTF8.GetBytes(VERAG_PROG_ALLGEMEIN.cCryptography3.Encrypt(password)).Length
            Return Argon.GetBytes(nHash)
        End If
    End Function
    Public Shared Async Function HashPasswordAsync(password As String, salt As Byte(), nIterations As Integer, nHash As Integer) As Task(Of Byte())
        'Dim Argon As Argon2id = New Argon2id(Encoding.UTF8.GetBytes(password))

        If HttpContext.Current.Request.ServerVariables("SERVER_NAME") = "localhost" Then
            Dim Argon As Argon2id = New Argon2id(Encoding.UTF8.GetBytes(VERAG_PROG_ALLGEMEIN.cCryptography3.Encrypt(password)))
            Argon.Salt = salt
            Argon.DegreeOfParallelism = 8
            Argon.Iterations = nIterations * VERAG_VARIABLES.RandomInteger(2, 3)
            Argon.MemorySize = (((nIterations * 19.98 - (nIterations * 10.23) / 14 * 2) / 4.058) + 1 * 190)
            Return Await Argon.GetBytesAsync(nHash)
        Else
            Dim Argon As Argon2id = New Argon2id(Encoding.UTF8.GetBytes(VERAG_PROG_ALLGEMEIN.cCryptography3.Encrypt(password)))
            Argon.Salt = salt
            Argon.DegreeOfParallelism = 10
            Argon.Iterations = nIterations * VERAG_VARIABLES.RandomInteger(2, 3)
            Argon.MemorySize = (((nIterations * 21.98 - (nIterations * 10.23) / 14 * 2) / 4.058) + 1 * 190)
            Return Await Argon.GetBytesAsync(nHash)
        End If
    End Function

    Public Shared Function Verifyhash(ByVal passw As String, salt As Byte(), ByVal hash As Byte(), ByVal nIterations As Integer, ByVal nHash As Integer) As Boolean
        Dim newHash As Byte() = HashPassword(passw, salt, nIterations, nHash)
        Return hash.SequenceEqual(newHash)
    End Function
    Public Shared Async Function VerifyhashAsync(ByVal passw As String, salt As Byte(), ByVal hash As Byte(), ByVal nIterations As Integer, ByVal nHash As Integer) As Task(Of Boolean)
        Dim newHash As Byte() = Await HashPasswordAsync(passw, salt, nIterations, nHash)
        Return hash.SequenceEqual(newHash)
    End Function
    Public Shared Function RandomInteger(ByVal min As Integer, ByVal max As Integer) As Integer
        Dim rand As New RNGCryptoServiceProvider()
        Dim one_byte() As Byte = {0}
        rand.GetBytes(one_byte)
        Return min + (max - min) * (one_byte(0) / 255)
    End Function


End Class