我想计算一些内容的MD5校验和。如何在PowerShell中做到这一点?
当前回答
这里有两行,只需在第2行中更改“hello”:
PS C:\> [Reflection.Assembly]::LoadWithPartialName("System.Web")
PS C:\> [System.Web.Security.FormsAuthentication]::HashPasswordForStoringInConfigFile("hello", "MD5")
其他回答
正如已接受的答案中所述,Get-FileHash很容易用于文件,但也可以用于字符串:
$s = "asdf"
Get-FileHash -InputStream ([System.IO.MemoryStream]::New([System.Text.Encoding]::ASCII.GetBytes($s)))
网上有很多使用ComputeHash()的例子。我的测试显示,在网络连接上运行时速度非常慢。下面的片段对我来说运行得更快,但你的里程可能会有所不同:
$md5 = [System.Security.Cryptography.MD5]::Create("MD5")
$fd = [System.IO.File]::OpenRead($file)
$buf = New-Object byte[] (1024*1024*8) # 8 MB buffer
while (($read_len = $fd.Read($buf,0,$buf.length)) -eq $buf.length){
$total += $buf.length
$md5.TransformBlock($buf,$offset,$buf.length,$buf,$offset)
Write-Progress -Activity "Hashing File" `
-Status $file -percentComplete ($total/$fd.length * 100)
}
# Finalize the last read
$md5.TransformFinalBlock($buf, 0, $read_len)
$hash = $md5.Hash
# Convert hash bytes to a hexadecimal formatted string
$hash | foreach { $hash_txt += $_.ToString("x2") }
Write-Host $hash_txt
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
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("-","")
如果你正在使用PowerShell社区扩展,有一个Get-Hash命令可以很容易地做到这一点:
C:\PS> "hello world" | Get-Hash -Algorithm MD5
Algorithm: MD5
Path :
HashString : E42B054623B3799CB71F0883900F2764
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