CODEWITHSUNDEEP
windowspowershellcmd
Varun Kaushik
Varun Kaushik

Reputation: 3

Executing a command in PowerShell by setting an environment variable in cmd

I want to execute a function in PowerShell from Windows CMD. Basically the requirement is to calculate the hash of a string, since Windows batch/cmd does not provide the functionality to generate a hash of a string, I've to use PowerShell.

I don't want to run a PowerShell script or put the function in a ps script as by doing so I have to bypass the Windows PowerShell security policy.

Below is the code which I am running in Hash.cmd. The code, when executed in PowerShell, runs perfectly fine.

@echo off
powershell -Command "& { Function Get-Hash([String] $String) { $StringBuilder = New-Object System.Text.StringBuilder;   [System.Security.Cryptography.HashAlgorithm]::Create("sha1").ComputeHash([System.Text.Encoding]::UTF8.GetBytes($String))|%{  [Void]$StringBuilder.Append($_.ToString("x2")); }; $StringBuilder.ToString(); }; $res=Get-Hash "Hello world"; echo $res; }"

But this is resulting in error on CMD as below:

At line:1 char:153
+ ... lder;   [System.Security.Cryptography.HashAlgorithm]::Create(sha1).Co ...
+                                                                  ~
Missing ')' in method call.
At line:1 char:153
+ ... ;   [System.Security.Cryptography.HashAlgorithm]::Create(sha1).Comput ...
+                                                              ~~~~
Unexpected token 'sha1' in expression or statement.
At line:1 char:41
+ & { Function Get-Hash([String] $String) { $StringBuilder = New-Object ...
+                                         ~
Missing closing '}' in statement block or type definition.
At line:1 char:3
+ & { Function Get-Hash([String] $String) { $StringBuilder = New-Object ...
+   ~
Missing closing '}' in statement block or type definition.
At line:1 char:157
+ ...    [System.Security.Cryptography.HashAlgorithm]::Create(sha1).Compute ...
+                                                                 ~
Unexpected token ')' in expression or statement.
At line:1 char:262
+ ... etBytes($String))|{  [Void]$StringBuilder.Append($_.ToString(x2)); }; ...
+                                                                  ~
Missing ')' in method call.
At line:1 char:262
---- TRUNCATED-----

Upvotes: 0

Views: 1184

Answers (2)

Varun Kaushik
Varun Kaushik

Reputation: 3

The issue was that I was using % in place for Foreach-Object

Below is the correct cmd script

@echo off
powershell -command "& { Function Get-Hash([String] $String) { $StringBuilder =  New-Object System.Text.StringBuilder;   [System.Security.Cryptography.HashAlgorithm]::Create('sha1').ComputeHash([System.Text.Encoding]::UTF8.GetBytes($String)) | Foreach-object {  [Void]$StringBuilder.Append($_.ToString('x2')); }; $StringBuilder.ToString(); }; $hash=Get-Hash 'Hello World'; echo $hash; }"

Upvotes: 0

henrycarteruk
henrycarteruk

Reputation: 13237

You're having quoting issues because you're using double quotes within double quotes which breaks the quoting.

As the strings in your code that are double quoted don't require expansion (see about_quoting_rules), you can just change the double quotes "sha1" / "x2" / "Hello world" to single quotes eg 'sha1'

EDIT: Working code for me:

powershell -command "& { Function Get-Hash([String]$String) { $StringBuilder = New-Object System.Text.StringBuilder;   [System.Security.Cryptography.HashAlgorithm]::Create('sha1').ComputeHash([System.Text.Encoding]::UTF8.GetBytes($String))|%{  [Void]$StringBuilder.Append($_.ToString('X2')); }; $StringBuilder.ToString(); }; $res=Get-Hash 'Hello world'; echo $res; }"

Upvotes: 4

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