How to translate this javascript code to vb.net - vb.net

Question

It's a simple code
var contentHash = CryptoJS.SHA512(JSON.stringify(requestBody)).toString(CryptoJS.enc.Hex);
Also it's actually simpler. I think requestBody is just an empty string.
https://bittrex.github.io/api/v3#topic-Authentication
What I tried is to do
Dim hasher = New System.Security.Cryptography.HMACSHA512(System.Text.Encoding.UTF8.GetBytes(""))
Dim contentHash = ExchangesClass.getString(hasher.ComputeHash(System.Text.Encoding.UTF8.GetBytes("")))
Where ExchangeClass.getString is
Public Shared Function getString(sigs As Byte()) As String
Dim list = New Generic.List(Of String)
For Each b In sigs
Dim chunk = b.ToString("x2")
list.Add(chunk)
Next
Dim result = String.Concat(list)
Dim result2 = BitConverter.ToString(sigs).Replace("-", "").ToLower()
Debug.Assert(result = result2)
Return result
End Function
But that's sort of weird. Why would anyone want a hash of an empty string. Unless I am missing something. I do not see where requestBody is. Perhaps because I use only read only API of bittrex

Answer 1

This code works
So
var contentHash = CryptoJS.SHA512(JSON.stringify(requestBody)).toString(CryptoJS.enc.Hex);
becomes
Protected Overridable Function computeSigNoHmac(content As String) As String
Dim hasher2 = New System.Security.Cryptography.SHA512Managed() 'create hashers based on those bytes
Dim hashbytes = hasher2.ComputeHash(System.Text.Encoding.UTF8.GetBytes(content)) 'compute the hash and get bytes
Dim sighash2 = BitConverter.ToString(hashbytes).Replace("-", "").ToLower() 'turn bytes into hex string (0-9a-f)
Return sighash2
End Function
Also, for completion,
var signature = CryptoJS.HmacSHA512(preSign, apiSecret).toString(CryptoJS.enc.Hex);
Becomes
Protected Overridable Function computeSig(content As String, secret As String) As String
Dim secretinBytes = System.Text.Encoding.UTF8.GetBytes(secret) 'Turn secret hex into bytes (0-9a-f)
Dim hasher2 = New System.Security.Cryptography.HMACSHA512(secretinBytes) 'create hashers based on those bytes
'Dim hasher3 = New System.Security.Cryptography.SHA512(secretinBytes) 'create hashers based on those bytes
Dim hashbytes = hasher2.ComputeHash(System.Text.Encoding.UTF8.GetBytes(content)) 'compute the hash and get bytes
Dim sighash2 = BitConverter.ToString(hashbytes).Replace("-", "").ToLower() 'turn bytes into hex string (0-9a-f)
Return sighash2
End Function