Vb.net visualbasic中SHA-1散列函数的语法解释

上面是VB.NET的SHA1哈希函数

Function getSHA1Hash(ByVal strToHash As String) As String
        Dim sha1Obj As New Security.Cryptography.SHA1CryptoServiceProvider
        Dim bytesToHash() As Byte = System.Text.Encoding.ASCII.GetBytes(strToHash)
        bytesToHash = sha1Obj.ComputeHash(bytesToHash)
        Dim strResult As String = ""
        For Each b As Byte In bytesToHash
            strResult += b.ToString("x2")
        Next
        Return strResult
End Function

请有人解释一下上面的代码（visualbasic.NET），特别是下面的几行-

bytesToHash = sha1Obj.ComputeHash(bytesToHash)
For Each b As Byte In bytesToHash
strResult += b.ToString("x2")

---

SHA1创建一个表示strToHash值的哈希（字节数组）。foreach只是将这个字节数组转换成字符串。

创建一个包含哈希的字节数组

bytesToHash = sha1Obj.ComputeHash(bytesToHash)

循环遍历刚刚创建的每个字节

For Each b As Byte In bytesToHash

将每个字节的十六进制值附加到字符串

strResult += b.ToString("x2")

ToString的十六进制格式见此：