[Bug 1175759] New: Checksum validation in PowerShell is wrong

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1175759

Bug ID: 1175759
           Summary: Checksum validation in PowerShell is wrong
           Product: Fedora Documentation
           Version: devel
         Component: install-guide
          Assignee: [e-mail]
          Reporter: [e-mail]
        QA Contact: [e-mail]
                CC: [e-mail], [e-mail]

Description of problem:
I tried to use the info at
http://docs.fedoraproject.org/en-US/Fedora/21/html/Installation_Guide/sect-v...
and found that the commands did not work due to missing quotes and case
sensitivity.

Version-Release number of selected component (if applicable):
Fedora 21

How reproducible:
Every time for me.

Steps to Reproduce:
1. Download ISO
2. Download checksum file
3. Use code on
http://docs.fedoraproject.org/en-US/Fedora/21/html/Installation_Guide/sect-v...

Actual results:
PS D:\Downloads> $image = "Fedora-Live-Workstation-x86_64-21-5.iso"
PS D:\Downloads> $checksum_file = "Fedora-Workstation-21-x86_64-CHECKSUM.md5"
PS D:\Downloads> $sha256 = New-Object -TypeName
System.Security.Cryptography.sha256CryptoSer
viceProvider
PS D:\Downloads> $exepected_checksum = ((Get-Content $checksum_file |
Select-String -Pattern
 $image) -split " ")[0]
PS D:\Downloads> $download_checksum =
[System.BitConverter]::ToString($sha256.ComputeHash([S
ystem.IO.File]::ReadAllBytes($PWD$image)))
At line:1 char:109
+ ... adAllBytes($PWD$image)))
+                    ~
Missing ')' in method call.
At line:1 char:109
+ ... adAllBytes($PWD$image)))
+                    ~~~~~~~
Unexpected token '$image' in expression or statement.
At line:1 char:116
+ ... tes($PWD$image)))
+                    ~
Unexpected token ')' in expression or statement.
At line:1 char:117
+ ... es($PWD$image)))
+                    ~
Unexpected token ')' in expression or statement.
At line:1 char:118
+ ... s($PWD$image)))
+                    ~
Unexpected token ')' in expression or statement.
    + CategoryInfo          : ParserError: (:) [],
ParentContainsErrorRecordException
    + FullyQualifiedErrorId : MissingEndParenthesisInMethodCall

Expected results:
No errors in console

Additional info:
I fixed the code and made the output more readable. Below is what I think
should be posted on that page of the docs:

$image = "Fedora-Live-Workstation-x86_64-21-5.iso"
$checksum_file = "Fedora-Workstation-21-x86_64-CHECKSUM"
$sha256 = New-Object -TypeName
System.Security.Cryptography.sha256CryptoServiceProvider
$expected_checksum = ((Get-Content $checksum_file | Select-String -Pattern
$image) -split " ")[0].ToLower()
$download_checksum =
[System.BitConverter]::ToString($sha256.ComputeHash([System.IO.File]::ReadAllBytes("$PWD$image"))).ToLower()
-replace '-', ''
if ( "$download_checksum" -eq "$expected_checksum" ) {
  echo "Checksum test passed!"
} else {
  echo "Checksum test failed."
}
echo "Download Checksum: $download_checksum"
echo "Expected Checksum: $expected_checksum"