将VB转换为c#

我有一个用VB编写的加密类，我正试图翻译成c#。在VB代码中，有一段代码:

    ' Allocate byte array to hold our salt.
    Dim salt() As Byte = New Byte(saltLen - 1) {}
    ' Populate salt with cryptographically strong bytes.
    Dim rng As RNGCryptoServiceProvider = New RNGCryptoServiceProvider()
    rng.GetNonZeroBytes(salt)
    ' Split salt length (always one byte) into four two-bit pieces and
    ' store these pieces in the first four bytes of the salt array.
    salt(0) = ((salt(0) And &HFC) Or (saltLen And &H3))
    salt(1) = ((salt(1) And &HF3) Or (saltLen And &HC))
    salt(2) = ((salt(2) And &HCF) Or (saltLen And &H30))
    salt(3) = ((salt(3) And &H3F) Or (saltLen And &HC0))

我把它翻译成c#，最后得到如下代码:

    // Allocate byte array to hold our salt.
    byte[] salt = new byte[saltLen];
    // Populate salt with cryptographically strong bytes.
    RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
    rng.GetNonZeroBytes(salt);
    // Split salt length (always one byte) into four two-bit pieces and
    // store these pieces in the first four bytes of the salt array.
    salt[0] = ((salt[0] & 0xfc) | (saltLen & 0x3));
    salt[1] = ((salt[1] & 0xf3) | (saltLen & 0xc));
    salt[2] = ((salt[2] & 0xcf) | (saltLen & 0x30));
    salt[3] = ((salt[3] & 0x3f) | (saltLen & 0xc0));

当我尝试编译这个时，我在分配给salt[]的4个中的每一个都得到一个错误-代码块中的最后4行。错误是:

错误255不能隐式地将类型'int'转换为'byte'。一个显式的存在转换(您是否缺少强制类型转换?)

请原谅我的无知-我是一个相对的c#新手，我尝试了以下，但仍然得到错误:

    salt[0] = ((salt[0] & 0xfc as byte) | (saltLen & 0x3 as byte));
    salt[0] = ((salt[0] & (byte)0xfc) | (saltLen & (byte)0x3));

我不太确定这段代码在做什么，这可能解释了为什么我无法找出如何修复它。

salt[0] = (byte)((salt[0] & 0xfc) | (saltLen & 0x3));
salt[1] = (byte)((salt[1] & 0xf3) | (saltLen & 0xc));
salt[2] = (byte)((salt[2] & 0xcf) | (saltLen & 0x30));
salt[3] = (byte)((salt[3] & 0x3f) | (saltLen & 0xc0));