PowerShell 技能连载 - 获取文本的哈希值

在 PowerShell 5（以及 Get-FileHash 之前），要计算字符串和文件的哈希值，您需要借助原生的 .NET 方法。以下是一段为一个字符串创建 MD5 哈希的示例代码：

$Text = 'this is the text that you want to convert into a hash'

$Provider = New-Object -TypeName Security.Cryptography.MD5CryptoServiceProvider
$Encodiner = New-Object -TypeName Text.UTF8Encoding

$Bytes = $Encodiner.GetBytes($Text)
$hashBytes = $Provider.ComputeHash($Bytes)
$hash = [System.BitConverter]::ToString($hashBytes)

# remove dashes if needed
$hash -replace '-'

如果您需要计算一个文件内容的哈希值，要么使用 Get-Content 来读取文件，或者使用以下代码：

$Path = "C:\somefile.txt"

# use your current PowerShell host as a sample
$Path = Get-Process -Id $Pid | Select-Object -ExpandProperty Path

$Provider = New-Object -TypeName Security.Cryptography.MD5CryptoServiceProvider
$FileContent = [System.IO.File]::ReadAllBytes($Path)
$hashBytes = $Provider.ComputeHash($FileContent)
$hash = [System.BitConverter]::ToString($HashBytes)

$hash -replace '-'