Powershell的：含有功能哈希表与参数

Question

被称为我有这样的字典：

function HashHandlerSHA256 
{ 
    param($Path, $Checksum) 

    $csp = new-object -TypeName System.Security.Cryptography.SHA256CryptoServiceProvider 
    $ComputedHash = $csp.ComputeHash([System.IO.File]::ReadAllBytes($Path)) 
    $ComputedHash = [System.BitConverter]::ToString($ComputedHash).Replace("-", "").ToLower() 

    $result = $ComputedHash.CompareTo($Checksum) 

    return $result -eq 0 
} 

$HashHandler = @{"SHA256" = HashHandlerSHA256} 

含有验证算法和功能被调用以进行验证。这些函数应该都具有相同的参数和返回类型。

现在，当我有：

$Checksums = @{"SHA256" = "..."} 

我想打电话，这取决于算法和值我拥有正确的功能。在这种情况下，我会有一个有效的sha256散列。

现在我想做的事：

function Validate 
{ 
    param($Path, $Checksums) 

    foreach($Hash in $Checksums) { 
     $Type = $Hash.Name 
     $Value = $Hash.Value 

     if ($HashHandler.ContainsKey($Type)) { 
      $Handler = $HashHandler.Get_Item($Type) 
      if (-Not ($Handler -Path $Path -Checksum $Value)) { 
       return $FALSE 
      } 
     } 
    } 

    return $TRUE 
} 

我得到的errormessage的是：

At C:\Users\username\Desktop\hashtest.ps1:27 char:23 
+    if (-Not ($Handler -Path $Path -Checksum $Value)) { 
+        ~~~~~ 
Unexpected token '-Path' in expression or statement. 

我是比较新的PowerShell的。我知道如何使用参数调用函数，但是当存储在一个变量中时，我没有设法解决这个问题，当在网上搜索时，我没有得到我需要的答案。

感谢您的帮助。

Answer 1

如果我理解你想是这样的

function HashHandlerSHA256 
{ 
    param($Path, $Checksum) 

    $csp = new-object -TypeName System.Security.Cryptography.SHA256CryptoServiceProvider 
    $ComputedHash = $csp.ComputeHash([System.IO.File]::ReadAllBytes($Path)) 
    $ComputedHash = [System.BitConverter]::ToString($ComputedHash).Replace("-", "").ToLower() 
    $result = $ComputedHash.CompareTo($Checksum) 

    return $result -eq 0 
} 

function Validate 
{ 
    param($Path, $Checksums) 

     foreach($Hashkey in $Checksums.Keys) 
     { 
      $Value = $Checksums[$Hashkey] 

      if ($script:HashHandler.ContainsKey($Hashkey)) 
      { 
       if (-Not (&$script:HashHandler[$Hashkey] -Path $Path -Checksum $Value)) { return $false} 
      } 
     } 

    return $TRUE 
} 


#add here your couples of algo/function 
$script:HashHandler = @{"SHA256" = 'HashHandlerSHA256'} 

#checksum to test 
$Checksums=@{} 
$Checksums["SHA256"]= 'd6a0a09fb1a7971b497674675d5b5621d865d6020e384137548de9c4ac6d4994' 
$Checksums["MD5"]= 'xxxx' 

#test list checksum and algo 
Validate -Path "c:\temp\hello.csv" -Checksums $Checksums 

的其他解决方案

$file="C:\temp\exludevalue.txt" 
$Checksums=@{} 
$Checksums["SHA256"]= 'd6a0a09fb1a7971b497674675d5b5621d865d6020e384137548de9c4ac6d4994' 
$Checksums["MD5k"]= '11A8D99F80F9B29FCF6A995D2F17B2E3' 

$Checksums.Keys | 
%{ 
    if ($(gcm Get-FileHash).Parameters.Algorithm.Attributes.ValidValues -contains $_) 
    { 
     $algocalc=(Get-FileHash -path $file -Algorithm $_).Hash; 
    } 
    else 
    { 
     $algocalc='ALGO NOT FOUNDED' 
    } 

    new-object psobject -Property @{ 
         Algo=$_ 
         OldValue=$Checksums[$_] 
         CalculedValue=$algocalc 
         ResultComparison= $algocalc -eq $Checksums[$_] 
         } 
}