Powershell functions to convert from byte array to hex or binary and vice versa.

ConvertTo-HexBinByteArr.ps1

$bits_in_a_byte = 8
$base2 = 2
$base16 = 16

Function ConvertTo-HexFromByteArray 
{
    param(
        [parameter(Mandatory=$true)]
        [Byte[]]
        $bytes
    )

    $hex = [System.Text.StringBuilder]::new($bytes.Length * $base2)

    ForEach($byte in $bytes)
    {
        # Default is two character format with just : X.
        $hex.AppendFormat("{0:x2}", $byte) | Out-Null
    }

    $hex.ToString()
}

Function ConvertTo-ByteArrayFromHex 
{
    param(
        [parameter(Mandatory=$true)]
        [String]
        $hex
    )

    $bytes = [byte[]]::new($hex.Length / $base2)

    for($i=0; $i -lt $hex.Length; $i+=$base2)
    {
        $bytes[$i/$base2] = [Convert]::ToByte($hex.Substring($i, $base2), $base16)
    }
    
    $bytes
}


Function ConvertTo-BinFromByteArray
{
    param(
        [parameter(Mandatory=$true)]
        [Byte[]]
        $bytes
    )
    
    ($bytes | %{ [Convert]::ToString($_,2).PadLeft($bits_in_a_byte,'0') }) -JOIN " "
}


Function ConvertTo-ByteArrayFromBin 
{
    param(
        [parameter(Mandatory=$true)]
        [String]
        $bin
    )

    $binStr = $bin -Replace '\s', ''
    $byteArrSize = $binStr.Length / $bits_in_a_byte
    $bytes = [byte[]]::new($byteArrSize)
    
    for($i=0; $i -lt $byteArrSize; $i++)
    {
        $bytes[$i] = [Convert]::ToByte($binStr.Substring($i*$bits_in_a_byte, $bits_in_a_byte), $base2);
    }
    
    $bytes
}