Our Hash code in Visual Basic.
Hash Class File:
Imports System.Numerics
Imports System.Globalization
Public Class Hashes
Public Function hashWord(msg As Char()) As String
' encoding eqn { Tn = (n-2)t1 + 2^n } - please use your own eqn
Dim hash = ""
Dim big_hash As BigInteger = 0
Dim n As Integer
Dim t1 As Integer
Dim x As BigInteger
For i As Integer = 0 To msg.Length - 1
' get unicode of this character as n
n = AscW(msg(i))
t1 = i + 1
' use recurrence series equation to hash
x = BigInteger.Add(BigInteger.Multiply(n - 2, t1), BigInteger.Pow(2, n))
If i = 0 Then
hash = x.ToString()
big_hash = x
Continue For
End If
' convert number from base 10 to base 2
Dim binary = ""
Dim remainder As BigInteger = 0
Do
big_hash = BigInteger.DivRem(big_hash, 2, remainder)
binary = remainder.ToString() + binary
Loop While big_hash.Equals(BigInteger.Zero) = False
' bitwise rotate left with the modulo of x
x = BigInteger.Remainder(x, binary.Length)
Dim slice_1 = binary.Substring(x).ToCharArray()
' keep as '1' to preserve hash size
slice_1(0) = "1"
Dim slice_2 As String = binary.Substring(0, x)
hash = String.Join("", slice_1) + slice_2
' convert number from base 2 to base 10
big_hash = 0 ' Not necessary; just stating the obvious
Dim j = 0
Do While j < hash.Length
big_hash = BigInteger.Add(BigInteger.Multiply(Integer.Parse(hash(j).ToString()), BigInteger.Pow(2, hash.Length - 1 - j)), big_hash)
j += 1
Loop
Next i
hash = big_hash.ToString("X")
hash = hash.ToUpper()
Return hash
End Function
End ClassMain Class:
Module Miscellaneous_Hashes
Sub Main()
Dim message = "merry xmas".ToCharArray()
Dim one_way = New Hashes()
Dim hashed = one_way.hashWord(message)
Console.WriteLine("Message is '" & String.Join("", message) & "';" &
Environment.NewLine & "Message hash is " + hashed)
End Sub
End ModuleTry it out!
Elegance (0.0)
