Get-Sha1HashFile.ps1

1. <# 
2. .SYNOPSIS 
3.     This script uses the SHA1 Crypto Provider to hash a file 
4. .DESCRIPTION 
5.     This script uses SHA1 Cryptoprovider to hash a file and print the hash. A second 
6.     hash is created of the same file, but with a space added. The file I picked is a 
7.     large text file I keep in c:\foo for uses like this! 
8. .NOTES 
9.     File Name  : Get-Sha1HashFile.ps1 
10.     Author     : Thomas Lee - tfl@psp.co.uk 
11.     Requires   : PowerShell Version 2.0 
12. .LINK 
13.     This script posted to: 
14.         http://www.pshscripts.blogspot.com 
15.     Posted to TechEd Sample Gallery at: 
16.  
17. .EXAMPLE 
18.     PSH [C:\foo]: .\Get-Sha1HashFile.ps1 
19.     Hashing     : C:\foo\gd.txt 
20.     Results in  : 760bb67356560232 
21.     Hashing     :  C:\foo\gd.txt + space 
22.     Results in  : 4f7b4902168bba7d 
23.      
24. #> 
25.  
26. # Create Input Data 
27. $file       = (ls c:\foo\*.txt | sort -descending length)[0] # get largest file 
28. $filestr    = Get-Content $file 
29. $filebytes1 = [System.Text.UnicodeEncoding]::Unicode.getbytes($files) 
30. $filebytes2 = [System.Text.UnicodeEncoding]::Unicode.getbytes($files+" ") 
31.  
32. # Create a New SHA1 Crypto Provider 
33. $sha = New-Object System.Security.Cryptography.SHA1CryptoServiceProvider 
34.  
35. # Now hash that 
36. $result1 = $sha.ComputeHash($filebytes1) 
37. "Hashing     : {0}" -f $file.FullName 
38. "Results in  : {0}" -f [system.BitConverter]::ToUint64($result1,0).tostring("x") 
39.  
40. $result2 = $sha.ComputeHash($filebytes2) 
41. "Hashing     : {0}" -f " $($file.FullName) + space" 
42. "Results in  : {0}" -f [system.BitConverter]::ToUint64($result2,0).tostring("x") 

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