2014-11-06, 20:56
Here’s some code to a) calculate a MD5 hash for a given file and b) to compare the hash with a MD5 provided in an external file. The scripts expects the MD5 file to have the same name, but MD5 extension. Credit goes to the friendly souls providing the original code, I just copied and pasted everything together.
The comparison is just visual, both MD5 hashes — the calculated and the provided one — are printed on the screen, it’s easily to extend it for an automated comparison.
# Reference: http://onlinemd5.com/
### Step A: Get the name of the file
# http://blogs.technet.com/b/heyscriptingguy/archive/2009/09/01/hey-scripting-guy-september-1.aspx
Function Get-FileName($initialDirectory)
{
[System.Reflection.Assembly]::LoadWithPartialName("System.windows.forms") |
Out-Null
$OpenFileDialog = New-Object System.Windows.Forms.OpenFileDialog
$OpenFileDialog.initialDirectory = $initialDirectory
$OpenFileDialog.filter = "All files (*.*)| *.*"
$OpenFileDialog.ShowDialog() | Out-Null
$OpenFileDialog.filename
} #end function Get-FileName
# *** Entry Point to Script ***
$file = Get-FileName -initialDirectory "H:\MD5"
### Step B: Create a file handle from this string and calculate the MD5 sum
$filehandle = Get-ChildItem $file
# write-host "file: " $file
# write-host "DirectoryName: " $filehandle.DirectoryName
write-host "Name: " $filehandle.Name
# write-host "pure Name: " $filehandle.BaseName
# http://stackoverflow.com/questions/10521061/how-to-get-an-md5-checksum-in-powershell
$md5 = New-Object -TypeName System.Security.Cryptography.MD5CryptoServiceProvider
$hash = [System.BitConverter]::ToString($md5.ComputeHash([System.IO.File]::ReadAllBytes($filehandle))).ToLower().Replace("-","")
write-host "Calculated Hashsum: " $hash
### Step C: Get the MD5 sum from the MD5 sum file matching the other filename
$md5handle = Get-ChildItem $($filehandle.DirectoryName + "\" + $filehandle.BaseName + ".md5")
$md5sum = [IO.File]::ReadAllText($md5handle)
write-host "Provided MD5 " $md5sum |
# Reference: http://onlinemd5.com/
### Step A: Get the name of the file
# http://blogs.technet.com/b/heyscriptingguy/archive/2009/09/01/hey-scripting-guy-september-1.aspx
Function Get-FileName($initialDirectory)
{
[System.Reflection.Assembly]::LoadWithPartialName("System.windows.forms") |
Out-Null
$OpenFileDialog = New-Object System.Windows.Forms.OpenFileDialog
$OpenFileDialog.initialDirectory = $initialDirectory
$OpenFileDialog.filter = "All files (*.*)| *.*"
$OpenFileDialog.ShowDialog() | Out-Null
$OpenFileDialog.filename
} #end function Get-FileName
# *** Entry Point to Script ***
$file = Get-FileName -initialDirectory "H:\MD5"
### Step B: Create a file handle from this string and calculate the MD5 sum
$filehandle = Get-ChildItem $file
# write-host "file: " $file
# write-host "DirectoryName: " $filehandle.DirectoryName
write-host "Name: " $filehandle.Name
# write-host "pure Name: " $filehandle.BaseName
# http://stackoverflow.com/questions/10521061/how-to-get-an-md5-checksum-in-powershell
$md5 = New-Object -TypeName System.Security.Cryptography.MD5CryptoServiceProvider
$hash = [System.BitConverter]::ToString($md5.ComputeHash([System.IO.File]::ReadAllBytes($filehandle))).ToLower().Replace("-","")
write-host "Calculated Hashsum: " $hash
### Step C: Get the MD5 sum from the MD5 sum file matching the other filename
$md5handle = Get-ChildItem $($filehandle.DirectoryName + "\" + $filehandle.BaseName + ".md5")
$md5sum = [IO.File]::ReadAllText($md5handle)
write-host "Provided MD5 " $md5sum
Uwe Ziegenhagen likes LaTeX and Python, sometimes even combined.
Do you like my content and would like to thank me for it? Consider making a small donation to my local fablab, the Dingfabrik Köln. Details on how to donate can be found here Spenden für die Dingfabrik.
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Schlagwörter:
Powershell,
MD5 Category:
Powershell |
Kommentare deaktiviert für Using Powershell to calculate/compare MD5 hashes
2014-11-13, 09:13
Following up on an article a few days ago here’s a script that creates a MD5 file.
# Uwe Ziegenhagen, 12.11.2014
# Reference: http://onlinemd5.com/
### Step A: Get the name of the file
# http://blogs.technet.com/b/heyscriptingguy/archive/2009/09/01/hey-scripting-guy-september-1.aspx
Function Get-FileName($initialDirectory)
{
[System.Reflection.Assembly]::LoadWithPartialName("System.windows.forms") | Out-Null
$OpenFileDialog = New-Object System.Windows.Forms.OpenFileDialog
$OpenFileDialog.initialDirectory = $initialDirectory
$OpenFileDialog.filter = "All files (*.*)| *.*"
$OpenFileDialog.ShowDialog() | Out-Null
$OpenFileDialog.filename
} #end function Get-FileName
# *** Entry Point to Script ***
$file = Get-FileName -initialDirectory "C:\"
# write-host "file: " $file
### Step B: Create a file handle from this string and calculate the MD5 sum
$filehandle = Get-ChildItem $file
write-host "Filename: " $filehandle.Name
# http://stackoverflow.com/questions/10521061/how-to-get-an-md5-checksum-in-powershell
$md5 = New-Object -TypeName System.Security.Cryptography.MD5CryptoServiceProvider
$hash = [System.BitConverter]::ToString($md5.ComputeHash([System.IO.File]::ReadAllBytes($filehandle))).ToLower().Replace("-","")
write-host "Calculated Hashsum: " $hash
### Step C: Write the MD5 sum from the MD5 sum file matching the other filename
$hash | out-file -FilePath $($filehandle.DirectoryName + "\" + $filehandle.BaseName + ".md5") |
# Uwe Ziegenhagen, 12.11.2014
# Reference: http://onlinemd5.com/
### Step A: Get the name of the file
# http://blogs.technet.com/b/heyscriptingguy/archive/2009/09/01/hey-scripting-guy-september-1.aspx
Function Get-FileName($initialDirectory)
{
[System.Reflection.Assembly]::LoadWithPartialName("System.windows.forms") | Out-Null
$OpenFileDialog = New-Object System.Windows.Forms.OpenFileDialog
$OpenFileDialog.initialDirectory = $initialDirectory
$OpenFileDialog.filter = "All files (*.*)| *.*"
$OpenFileDialog.ShowDialog() | Out-Null
$OpenFileDialog.filename
} #end function Get-FileName
# *** Entry Point to Script ***
$file = Get-FileName -initialDirectory "C:\"
# write-host "file: " $file
### Step B: Create a file handle from this string and calculate the MD5 sum
$filehandle = Get-ChildItem $file
write-host "Filename: " $filehandle.Name
# http://stackoverflow.com/questions/10521061/how-to-get-an-md5-checksum-in-powershell
$md5 = New-Object -TypeName System.Security.Cryptography.MD5CryptoServiceProvider
$hash = [System.BitConverter]::ToString($md5.ComputeHash([System.IO.File]::ReadAllBytes($filehandle))).ToLower().Replace("-","")
write-host "Calculated Hashsum: " $hash
### Step C: Write the MD5 sum from the MD5 sum file matching the other filename
$hash | out-file -FilePath $($filehandle.DirectoryName + "\" + $filehandle.BaseName + ".md5")
Uwe Ziegenhagen likes LaTeX and Python, sometimes even combined.
Do you like my content and would like to thank me for it? Consider making a small donation to my local fablab, the Dingfabrik Köln. Details on how to donate can be found here Spenden für die Dingfabrik.
More Posts - Website
Schlagwörter:
Powershell,
MD5 Category:
Allgemein |
Kommentare deaktiviert für Using Powershell to create MD5 files
2014-11-06, 22:19
Here some Python code to calculate the MD5 hash for a given file:
# from http://www.pythoncentral.io/hashing-files-with-python/
import hashlib
hasher = hashlib.md5()
with open('e:/Mappe1.xlsx', 'rb') as afile:
buf = afile.read()
hasher.update(buf)
print(hasher.hexdigest()) |
# from http://www.pythoncentral.io/hashing-files-with-python/
import hashlib
hasher = hashlib.md5()
with open('e:/Mappe1.xlsx', 'rb') as afile:
buf = afile.read()
hasher.update(buf)
print(hasher.hexdigest())
Here the final script that provides the same functionality as the Powershell script I posted earlier today:
# http://www.pythoncentral.io/hashing-files-with-python/
import hashlib
import os
import codecs
hasher = hashlib.md5()
def calcHash(filename):
print("Filename: " + filename)
with open(filename, 'rb') as afile:
buf = afile.read()
hasher.update(buf)
print("Calculated: " + hasher.hexdigest())
md5file = (os.path.splitext(filename)[0]) + ".md5"
givenMD5 = codecs.open(md5file, "r", "utf-8-sig")
print("Provided: " + str(givenMD5.read()).lower())
calcHash("e:/Mappe1.xlsx") |
# http://www.pythoncentral.io/hashing-files-with-python/
import hashlib
import os
import codecs
hasher = hashlib.md5()
def calcHash(filename):
print("Filename: " + filename)
with open(filename, 'rb') as afile:
buf = afile.read()
hasher.update(buf)
print("Calculated: " + hasher.hexdigest())
md5file = (os.path.splitext(filename)[0]) + ".md5"
givenMD5 = codecs.open(md5file, "r", "utf-8-sig")
print("Provided: " + str(givenMD5.read()).lower())
calcHash("e:/Mappe1.xlsx")
Uwe Ziegenhagen likes LaTeX and Python, sometimes even combined.
Do you like my content and would like to thank me for it? Consider making a small donation to my local fablab, the Dingfabrik Köln. Details on how to donate can be found here Spenden für die Dingfabrik.
More Posts - Website
2014-11-15, 00:23
Here’s the probably last part of this series, the missing piece showing the calculation of MD5 files with Python:
# http://www.pythoncentral.io/hashing-files-with-python/
import hashlib
import os
import codecs
hasher = hashlib.md5()
def calcHash(filename):
print("Filename: " + filename)
with open(filename, 'rb') as afile:
buf = afile.read()
hasher.update(buf)
print("Calculated: " + hasher.hexdigest())
md5file = (os.path.splitext(filename)[0]) + ".md5"
writeMD5 = codecs.open(md5file, "wb", "utf-8-sig")
writeMD5.write(hasher.hexdigest())
calcHash("e:/arara.log") |
# http://www.pythoncentral.io/hashing-files-with-python/
import hashlib
import os
import codecs
hasher = hashlib.md5()
def calcHash(filename):
print("Filename: " + filename)
with open(filename, 'rb') as afile:
buf = afile.read()
hasher.update(buf)
print("Calculated: " + hasher.hexdigest())
md5file = (os.path.splitext(filename)[0]) + ".md5"
writeMD5 = codecs.open(md5file, "wb", "utf-8-sig")
writeMD5.write(hasher.hexdigest())
calcHash("e:/arara.log")
Uwe Ziegenhagen likes LaTeX and Python, sometimes even combined.
Do you like my content and would like to thank me for it? Consider making a small donation to my local fablab, the Dingfabrik Köln. Details on how to donate can be found here Spenden für die Dingfabrik.
More Posts - Website
