Vb.net SHA512哈希的VB类型设置

我有以下生成sha512哈希的函数。哈希已成功生成，但在将生成的字符串传递给其他函数时导致此错误：

输入字符串的格式不正确

调试时，保存返回哈希（设置为字符串）的变量为空。我尝试在函数和调用代码中将类型更改为int、int64和byte（数组和标准变量），这会导致其他各种错误。如何正确更改数据类型以解决此问题

Function create_hash(ByVal password, ByVal salt)

Dim salty As String = password & salt

'convert salty password to binary to feed into hash function
Dim encText As New System.Text.UTF8Encoding()
Dim btText() As Byte
btText = encText.GetBytes(salty)


'Dim data(btText) As Byte
'create password hash
Dim result() As Byte
Dim shaM As New SHA512Managed()
result = shaM.ComputeHash(btText)

Dim return_result As String

For Each Item As Integer In result

    return_result = return_result & Item

Next



Return return_result
End Function

呼叫代码：

Dim i_h_pass As String
Dim i_pass As String = pass.Text
            'handle password generation (matching passwords checked at validation)
            Dim newHash = New hashing
            Dim salt As String = Convert.ToString(newHash.create_salt)
            i_h_pass = Convert.ToString(newHash.create_hash(i_pass, salt))

编辑：

create_salt函数也经过了检查-它工作正常，返回一个随机整数，作为字符串返回，用于convence

修复：

函数create_hash（ByVal密码，ByVal salt）

Dim返回\u结果为String=BitConverter.ToString（结果）

改变

Dim salty As String = password & salt

'convert salty password to binary to feed into hash function
Dim encText As New System.Text.UTF8Encoding()
Dim btText() As Byte
btText = encText.GetBytes(salty)


'Dim data(btText) As Byte
'create password hash
Dim result() As Byte
Dim shaM As New SHA512Managed()
result = shaM.ComputeHash(btText)

Dim return_result As String = BitConverter.ToString(result)
    Return return_result
End Function