How to encrypt & encode a password with PowerShell v2?

Question

I'm trying to hit a web service using an SHA1 64 bit encoded password, but I'm not sure how to code this in powershell.

I tried using: PS C:\Program Files (x86)\PowerGUI> $password = "password not shown here"

PS C:\Program Files (x86)\PowerGUI> $bytes =  System.Text.Encoding]::Unicode.GetBytes($password)

PS C:\Program Files (x86)\PowerGUI> $encodedString = [Convert]::ToBase64CharArray($bytes)

But I got this back:

Cannot find an overload for "ToBase64CharArray" and the argument count: "1". At line:1 char:46 + $encodedString = [Convert]::ToBase64CharArray <<<< ($bytes) + CategoryInfo : NotSpecified: (:) [], MethodException + FullyQualifiedErrorId : MethodCountCouldNotFindBest

I'm new with powershell, so this may not even be the right code to use. I tried to modify an example I found online.

Any ideas how to do this only in powershell using SHA1 encryption and base64 encoding?

Okay, this works for the encoding, thanks to Jonathan for this part:

$str = "pwd"
$bytes = [System.Text.Encoding]::Unicode.GetBytes($str)
$encodedStr = [Convert]::ToBase64String($bytes)

# and the result:
Write-Host $encodedStr
cAB3AGQA

I noticed the function call :: is sensitive to whitespace. This works for the encryption piece.

$Sha1provider = New-Object System.Security.Cryptography.SHA1CryptoServiceProvider
$hashBytes = $Sha1provider.ComputeHash($bytes)
Write-Host $hashBytes
114 168 243 129 97 21 246 249 22 4 38 215 241 185 174 86 116 201 7 7

manojlds · Accepted Answer · 2011-11-04 18:52:03Z

1

The Convert.ToBase64CharArray method doesn't have an overload with just one argument.

http://msdn.microsoft.com/en-us/library/3d0e5t57.aspx

You probably want to do:

$encodedString = [Convert]::ToBase64String($bytes);
write-host $encodedString

Note that base64 encoding is not SHA1 encoding. Look here: http://blog.logiclabz.com/c/function-to-encrypt-string-in-c-net-using-sha1-algorithm.aspx

Also, you don't necessarily have to convert C# code to Powershell.

You can use Add-Type to include C# code in your scripts.

PS: And I think you know that encoding is not encryption? http://www.blesta.com/2009/07/26/encoding-vs-encryption/

edited Nov 4, 2011 at 18:52

answered Nov 4, 2011 at 18:41

manojlds

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