下面是一个尝试验证SHA256指纹的漂亮打印示例。我使用PowerShell v4下载了gpg4win v3.0.3(需要Get-FileHash)。

从https://www.gpg4win.org/download.html下载包，打开PowerShell，从下载页面抓取散列，然后运行:

cd ${env:USERPROFILE}\Downloads
$file = "gpg4win-3.0.3.exe"

# Set $hash to the hash reference from the download page:
$hash = "477f56212ee60cc74e0c5e5cc526cec52a069abff485c89c2d57d1b4b6a54971"

# If you have an MD5 hash: # $hashAlgo="MD5"
$hashAlgo = "SHA256"

$computed_hash = (Get-FileHash -Algorithm $hashAlgo $file).Hash.ToUpper()
if ($computed_hash.CompareTo($hash.ToUpper()) -eq 0 ) {
    Write-Output "Hash matches for file $file" 
} 
else { 
    Write-Output ("Hash DOES NOT match for file {0}: `nOriginal hash: {1} `nComputed hash: {2}" -f ($file, $hash.ToUpper(), $computed_hash)) 
}

输出:

Hash matches for file gpg4win-3.0.3.exe

这个网站有一个例子:使用Powershell进行MD5校验和。它使用. net框架实例化MD5哈希算法的实例来计算哈希值。

下面是本文的代码，包含Stephen的注释:

param
(
  $file
)

$algo = [System.Security.Cryptography.HashAlgorithm]::Create("MD5")
$stream = New-Object System.IO.FileStream($Path, [System.IO.FileMode]::Open,
    [System.IO.FileAccess]::Read)

$md5StringBuilder = New-Object System.Text.StringBuilder
$algo.ComputeHash($stream) | % { [void] $md5StringBuilder.Append($_.ToString("x2")) }
$md5StringBuilder.ToString()

$stream.Dispose()

右击菜单选项示例:

[HKEY_CLASSES_ROOT\*\shell\SHA1 PS check\command]
@="C:\\Windows\\system32\\WindowsPowerShell\\v1.0\\powershell.exe -NoExit -Command Get-FileHash -Algorithm SHA1 '%1'"

如果从Microsoft下载文件校验和完整性验证器(FCIV)，这将变成一行程序。

我从这里下载了FCIV: 文件校验和完整性验证工具的可用性和说明

执行如下命令。我有十份文件要检查。

Get-ChildItem WTAM*.tar | % {.\fciv $_.Name}

团队! 看看我的哈希计算函数。

Function Get-StringHash {
<#
    .DESCRIPTION
        Get string persistant hash.        
#>
    [OutputType([string])]
    [CmdletBinding()]
    Param(
        [Parameter( Mandatory = $True, Position = 0, HelpMessage = "String to calculate hash." )]
        [string] $String,
        [Parameter( Mandatory = $false, Position = 0, HelpMessage = "String encoding." )]
        [ValidateSet( 'UTF8' )]
        [string] $StringEncoding = 'UTF8',
        [Parameter( Mandatory = $false, Position = 2, HelpMessage = "Hash algoritm." )]
        [ValidateSet( 'md5', 'sha256', 'sha512' )]
        [string] $Algoritm = 'sha256'
    )
    try {
        #region functions
        #endregion

        $Result = $null

        switch ( $Algoritm ) {
            'md5' {  
                $HashProvider = New-Object -TypeName System.Security.Cryptography.MD5CryptoServiceProvider
            }
            'sha256' {  
                $HashProvider = New-Object -TypeName System.Security.Cryptography.SHA256CryptoServiceProvider
            }
            'sha512' {  
                $HashProvider = New-Object -TypeName System.Security.Cryptography.SHA512CryptoServiceProvider
            }
            Default {}
        }

        switch ( $StringEncoding ) {
            'UTF8' {  
                $Encoding = New-Object -TypeName System.Text.UTF8Encoding
            }
            Default {}
        }
        
        
        $Result = [System.BitConverter]::ToString( $HashProvider.ComputeHash( $Encoding.GetBytes( $String ) )).replace('-','')

    }
    catch {
        Get-ErrorReporting -Trap $_
    }

    return $Result
}

$String   = 'Some text'
$Algoritm = 'MD5'

$Hash = Get-StringHash -String $String -Algoritm $Algoritm

write-host "$String has $Algoritm hash $hash"

PowerShell One-Liners(字符串到散列)

MD5

([System.BitConverter]::ToString((New-Object -TypeName System.Security.Cryptography.MD5CryptoServiceProvider).ComputeHash((New-Object -TypeName System.Text.UTF8Encoding).GetBytes("Hello, World!")))).Replace("-","")

SHA1

([System.BitConverter]::ToString((New-Object -TypeName System.Security.Cryptography.SHA1CryptoServiceProvider).ComputeHash((New-Object -TypeName System.Text.UTF8Encoding).GetBytes("Hello, World!")))).Replace("-","")

SHA256

([System.BitConverter]::ToString((New-Object -TypeName System.Security.Cryptography.SHA256CryptoServiceProvider).ComputeHash((New-Object -TypeName System.Text.UTF8Encoding).GetBytes("Hello, World!")))).Replace("-","")

SHA384

([System.BitConverter]::ToString((New-Object -TypeName System.Security.Cryptography.SHA384CryptoServiceProvider).ComputeHash((New-Object -TypeName System.Text.UTF8Encoding).GetBytes("Hello, World!")))).Replace("-","")

SHA512

([System.BitConverter]::ToString((New-Object -TypeName System.Security.Cryptography.SHA512CryptoServiceProvider).ComputeHash((New-Object -TypeName System.Text.UTF8Encoding).GetBytes("Hello, World!")))).Replace("-","")