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• How do I compare the md5sum of a file with the md5 file (that was available to download with the file)?

  - by user91583

  Images are available for a distro on http://livedistro.org/gnulinux/israel-remix-team-mint-12. I want to use the 32-bit version. I have downloaded the ISO file for the 32-bit version (customdist.iso). I have downloaded the md5 file for the ISO file (customdist.iso.md5). I want to calculate the md5sum of the ISO file and compare it to the md5 file. I can use the md5sum command to display within the terminal the calculated md5 for the ISO file. I have searched the web and can't find a way to compare the calculated md5 for the ISO file with the downloaded md5 file. So far, the closest I have come is the command md5sum -c customdist.iso.md5 from within the folder containing both the files, but this command gives the result: md5sum: customdist.iso.md5: no properly formatted MD5 checksum lines found Any ideas?

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• md5sum returns a different hash value than online hash generators

  - by Ravi

  On suse10, md5sum myname gives md5 hash as 49b0939cb2db9d21b038b7f7d453cd5d The file myname contains string "ravi" while some of the online md5 hash generators for the same string seem to give a different hash http://md5-encryption.com/ http://www.miraclesalad.com/webtools/md5.php They spit out the hash for "ravi" as 63dd3e154ca6d948fc380fa576343ba6 Why is there a difference in md5sum for the same string "ravi" ?

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• What is the fastest MD5 sum calculator?

  - by netvope

  I tested the speed of md5sum on a few Ubuntu 8.04 servers Pentium III 700 MHz: 52 MB/s Atom 1.6 GHz, 32-bit: 119 MB/s Core 2 (Yorkfield) 2.5GHz, 32-bit: 194 MB/s Core 2 (Yorkfield) 2.5GHz, 64-bit: 222 MB/s Then I downloaded a tool (by apt-get install) called md5deep and found that it's roughly 20% faster (as tested on the 32-bit Core 2 server). This makes me feel that the "vanilla" md5sum included in Ubuntu isn't the fastest one. Questions: Other than md5deep, are you aware of any MD5 calculators that are potentially faster than md5sum? (Answers for software from other OS are also welcomed.) If I want to compile md5sum myself, where can I download the source? What compiler options would you suggest for the Core 2 server? (note: gcc 4.2.4 in Ubuntu 8.04 does not seem to support -march=core2)

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• Alternate CD image downloaded last year gives different hash

  - by Oxwivi

  I had downloaded the alternate CD images through torrents some time last year, and now that I need it again I decided to check it's md5 hash. $ md5sum ubuntu-11.10-alternate-i386.iso b502888194367acdec4d79203e7a539c ubuntu-11.10-alternate-i386.iso Now the problem is, the reference hashes it's supposed to match to is completely different: 24da873c870d6a3dbfc17390dda52eb8 ubuntu-11.10-alternate-i386.iso Can I safely conclude the image I downloaded is corrupted? Reference UbuntuHashes - Community Ubuntu Documentation

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• md5sum repeatedly gives different checksum for same file on same machine

  - by Joel

  I have a very small and quite old hard drive disk, about 32G. On to this disk I have copied a largish tar file, about 5G. When I run md5sum to generate a checksum on this file I repeatedly get different results (on the same machine and the same file). This obviously should not happen. If I repeat the experiment with a much smaller file, as expected the checksum is the same each time. I can only assume that because the large file is spanning most of the disk, and it is an old drive, I am experiencing a lot of read errors on the hard drive - and it needs replacing? Could there be any other good reason for this? Something I can do to fix the problem other than buying a new disk? Update: sha1sum also produces inconsistent results.

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• Update failure: failed md5sum validation: sys.vgz

  - by NederWeb

  LS, I have ESXi 4, with all the 2009 updates installed. When i try to update the last firmware update, i receive the following error: Copy of /bootbank/sys.vgz to /tmp/stage/firmware/bank/sys.vgz failed md5sum validation (8:02:31:29.332 cpu1:1787979) warning 20-Jan-10 9:42:02 PM I updated the vmware-tools separatedly, which succeeded. I receive this message if i use the update GUI, but also when using the CLI tool. I haven't got a clue how to solve this, anyone any ideas? Or having similar problems?

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• md5sum of large files gives different results sometimes

  - by Emanuele

  I have an AMD quad core, 8 gb RAM, 1 SSD EXT2 (2 months old), 2 HDD EXT4, approximately 1 year old. I'm using Ubuntu 10.04 x86-64 and when I compute the md5sum of large files (9 GB) sometimes I get different values than the one stored on a reference file. Upon restarting and switching off the PC then I get the expected results no matter how many times I repeat it. But this is random. I've turn on ECC (the fastest possible settings) and the issue seems to be rarer, but I've run memtest86+ for 6+ hours without a glitch (and with ECC off!). Any idea? Should I update the BIOS of my motherboard (Asus EVO-something...don't remember it now)? I've tried all the rest apart this, but genuinely don't know what to do anymore... Any suggestion is appreciated!

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• Computing MD5SUM of large files in C#

  - by spkhaira

  I am using following code to compute MD5SUM of a file - byte[] b = System.IO.File.ReadAllBytes(file); string sum = BitConverter.ToString(new MD5CryptoServiceProvider().ComputeHash(b)); This works fine normally, but if I encounter a large file (~1GB) - e.g. an iso image or a DVD VOB file - I get an Out of Memory exception. Though, I am able to compute the MD5SUM in cygwin for the same file in about 10secs. Please suggest how can I get this to work for big files in my program. Thanks

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• md5sum via right click in ubuntu

  - by xain

  Is there an extension or script to calculate a file's md5 hash using the right click of the mouse in Ubuntu ?

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• md5sum or sha1sum of legitmate microsoft system files

  - by martyvis

  Is there a database or repository of the legitimate checksums for Microsoft system files? We think we have a 0day on DNS for Windows 2003 SP2 using IRC for command and control. (Latest McAfee does not see an issue). I want to compare our customer's dns.exe and associated DLLs with the real ones. (I will grab a fresh SP2 and hotfixed system to do this, but wonder how to do this in future without needed to do this.)

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• Fixing /etc/shadow with md5 passwords to sha512 passwords

  - by dr jimbob

  I recently upgraded an ubuntu server with many users to a recent version from a version from 2008. The server used to use md5 password hashes (e.g., the shadow passwords began with $1$) and now is configured to use sha512. I'd prefer to keep using sha512, but would like the old users to be able to partially login once with their old password and then be forced to update their password (even if its the same password) generating a sha512. Right now, the old md5-based passwords in /etc/shadow won't let the user login at all (and just appear to be incorrect passwords). This seems like plenty of people should have had to do this before; yet I can't see how to do it, looking in the common places like /etc/pam.d/common-password nad /etc/login.defs. Also users will be logging in via ssh; and I do not have everyone's contact info (email or otherwise); and some login fairly rarely. Any help? (Googling doesn't seem to give any good solutions).

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• Why does integrity check fail for the 12.04.1 Alternate ISO?

  - by mghg

  I have followed various recommendations from the Ubuntu Documentation to create a bootable Ubuntu USB flash drive using the 12.04.1 Alternate install ISO-file for 64-bit PC. But the integrity test of the USB stick has failed and I do not see why. These are the steps I have made: Download of the 12.04.1 Alternate install ISO-file for 64-bit PC (ubuntu-12.04.1-alternate-amd64.iso) from http://releases.ubuntu.com/12.04.1/, as well as the MD5, SHA-1 and SHA-256 hash files and related PGP signatures Verification of the data integrity of the ISO-file using the MD5, SHA-1 and SHA-256 hash files, after having verified the hash files using the related PGP signature files (see e.g. https://help.ubuntu.com/community/HowToSHA256SUM and https://help.ubuntu.com/community/VerifyIsoHowto) Creation of a bootable USB stick using Ubuntu's Startup Disk Creator program (see http://www.ubuntu.com/download/help/create-a-usb-stick-on-ubuntu) Boot of my computer using the newly made 12.04.1 Alternate install on USB stick Selection of the option "Check disc for defects" (see https://help.ubuntu.com/community/Installation/CDIntegrityCheck) Steps 1, 2, 3 and 4 went without any problem or error messages. However, step 5 ended with an error message entitled "Integrity test failed" and with the following content: The ./install/netboot/ubuntu-installer/amd64/pxelinux.cfg/default file failed the MD5 checksum verification. Your CD-ROM or this file may have been corrupted. I have experienced the same (might only be similar since I have no exact notes) error message in previous attempts using the 12.04 (i.e. not the maintenance release) Alternate install ISO-file. I have in these cases tried to install anyway and have so far not experienced any problems to my knowledge. Is failed integrity check described above a serious error? What is the solution? Or can it be ignored without further problems?

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• Generate md5 and other checksums from properties menu (added "Digests" tab)

  - by Chuck

  I am trying to restore a function that I had on my last box. It added a tab in the properties menu of any file called "Digests". From there I could choose any/all of the hash formats, click hash and it would generate said checksums right there. What I am trying to find out is either the name of the package or acquire the location of it's installation. I have started a thread on UbuntuForums pertaining to this already

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• How do you verify that 2 copies of a VB 6 executable came from the same code base?

  - by Tim Visher

  I have a program under version control that has gone through multiple releases. A situation came up today where someone had somehow managed to point to an old copy of the program and thus was encountering bugs that have since been fixed. I'd like to go back and just delete all the old copies of the program (keeping them around is a company policy that dates from before version control was common and should no longer be necessary) but I need a way of verifying that I can generate the exact same executable that is better than saying "The old one came out of this commit so this one should be the same." My initial thought was to simply MD5 hash the executable, store the hash file in source control, and be done with it but I've come up against a problem which I can't even parse. It seems that every time the executable is generated (method: Open Project. File Make X.exe) it hashes differently. I've noticed that Visual Basic messes with files every time the project is opened in seemingly random ways but I didn't think that would make it into the executable, nor do I have any evidence that that is indeed what's happening. To try to guard against that I tried generating the executable multiple times within the same IDE session and checking the hashes but they continued to be different every time. So that's: Generate Executable Generate MD5 Checksum: md5sum X.exe > X.md5 Verify MD5 for current executable: md5sum -c X.md5 Generate New Executable Verify MD5 for new executable: md5sum -c X.md5 Fail verification because computed checksum doesn't match. I'm not understanding something about either MD5 or the way VB 6 is generating the executable but I'm also not married to the idea of using MD5. If there is a better way to verify that two executables are indeed the same then I'm all ears. Thanks in advance for your help!

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• Memcache key generation strategy

  - by Maxim Veksler

  Given function f1 which receives n String arguments, would be considered better random key generation strategy for memcache for the scenario described below ? Our Memcache client does internal md5sum hashing on the keys it gets public class MemcacheClient { public Object get(String key) { String md5 = Md5sum.md5(key) // Talk to memcached to get the Serialization... return memcached(md5); } } First option public static String f1(String s1, String s2, String s3, String s4) { String key = s1 + s2 + s3 + s4; return get(key); } Second option /** * Calculate hash from Strings * * @param objects vararg list of String's * * @return calculated md5sum hash */ public static String stringHash(Object... strings) { if(strings == null) throw new NullPointerException("D'oh! Can't calculate hash for null"); MD5 md5sum = new MD5(); // if(prevHash != null) // md5sum.Update(prevHash); for(int i = 0; i < strings.length; i++) { if(strings[i] != null) { md5sum.Update("_" + strings[i] + "_"); // Convert to String... } else { // If object is null, allow minimum entropy by hashing it's position md5sum.Update("_" + i + "_"); } } return md5sum.asHex(); } public static String f1(String s1, String s2, String s3, String s4) { String key = stringHash(s1, s2, s3, s4); return get(key); } Note that the possible problem with the second option is that we are doing second md5sum (in the memcache client) on an already md5sum'ed digest result. Thanks for reading, Maxim.

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• How to convert Windows filenames (from a checksums.md5) to *nix notation so I can use it on my shell with md5sum?

  - by Somebody still uses you MS-DOS

  I have some checksums.md5 verification files from an ntfs external drive, but using windows notation: \ instead of /, spaces between file names (not escaped), reserved shell characters (like (, &, ', to name a few). The checksums.md5 has a bunch of checksums and filenames: ;Created by program ;2010 f12f75c1f2d1a658dc32ca6ef9ef3ffc *My Windows & Files (2010)\[bak]\testing.wmv 53445e1a0821b790872e60bd7a166887 *My Windows Files' 2 (2012)\[bak]\testing.wmv 53445e1a0821b790872e60bd7a166887 *My Windows Files ˜nicóde (2012)\[bak]\testing.wmv ;Finished I want to use this checksums.md5 to verify the files that I've copied to my machine: but I'm on a Linux, so I need to convert the names inside checksums.md5 from Windows to Linux to use the md5sum utility from the shell. The first line in my example would become: f12f75c1f2d1a658dc32ca6ef9ef3ffc My\ Windows\ \&\ Files\ \(2010\)/\[bak\]/testing.wmv Is there some application for this (converting a file listing, from windows cmd notation, to linux shell notation) or will I need to create a bash script using sed that just "replaces" what is "wrong" with the filenames?

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• Check if a program exists in bash

  - by ~rojanu

  I am trying to check if md5sum or digest exists on solaris and script is used on different machines. Here is the function in sh script which is called from a ksh script getMD5cmd () { PATH="${PATH}:/bin:/usr/bin:/usr/sfw/bin:/usr/local/bin:/usr/sbin/bin" if type -p md5sum;then MD5CMD=`type -p md5sum` elif type -p digest;then MD5CMD="`type -p digest` -a md5" fi echo "HERE ${MD5CMD}" } When I run scripts I get -p not found md5sum not found -p not found digest is /bin/digest HERE However, when I type it in a terminal, works as exptected Any Ideas? Thanks

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• How to correctly formalize the command line usage of GNU/Linux commands?

  - by Francesco Turco

  I'd like to write down a BNF-like formal grammar for describing the command line usage of some GNU/Linux tools. For example I can describe the usage of the cat command as: (cat-command) : 'cat' (arguments-list) (arguments-list) : (argument) (arguments-list) : (arguments-list) (argument) (argument) : (file) The problem is I can't write down a precise grammar for some commands such as md5sum. My first attempt at that would be the following: (md5sum-command) : 'md5sum' (arguments-list) (arguments-list) : (argument) (arguments-list) : (arguments-list) (argument) (argument) : (file) (argument) : '--check' But as you can see this grammar allows you to specify the --check argument as many times as you wish, which is incorrect as you should use it at most one time. How can I fix that? Also, what kind of formal grammars I should study for better treating this kind of problems? Thanks.

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• Mobile Safari SVG Problem

  - by md5sum

  I'm trying to get an SVG image to show up on my iPhone (or iPad) default browser, but I can't seem to get even just a rect to show up. Example at: http://www.invalidpage.com/svg/svgtest.html Source: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/html1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-us"> <head> <title>SVG iPhone Test</title> </head> <body> <div> <svg width="500" height="220"> <rect x="2" y="2" width="496" height="216" stroke="#000" stroke-width="2px" fill="transparent"></rect> </svg> </div> </body> </html>

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• hardy alternate cd customization and ubuntu-keyring-udeb

  - by gokul

  I have been trying to customize Ubuntu 8.04 (hardy heron) alternate install cd. I have followed the community documentation at https://help.ubuntu.com/community/InstallCDCustomization#Generating_a_new_ubuntu-keyring_.deb_to_sign_your_CD to rebuild the ubuntu-keyring packages. But when the media boots I get a warning: anna[7581]: WARNING **: bad md5sum. Though I have not been able to confirm that the message is for the ubunu-keyring-udeb package, the nearest debconf Adding [package] message is for ubuntu-keyring-udeb. This is followed by: INPUT critical retriever/cdrom/error. This message is already from syslog. I don't think dpkg.log will help in this case. I have tried modifying the md5sum file within the source package manually and signing it with my own public key, before building it. But that has not helped either. How do get the installer to work in this scenario? Alternatively, can I customize the contents of Ubuntu8.04 without signing anything?

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• Use MD5 to validate the exchanged files between Oracle and Customer

  - by Jie Chen

  Oracle Supports may ask customers to upload some data files (Database Dump, Trace Log, etc) for research. We often see the scenario that the uploaded huge files are corrupted and have to ask to re-upload. Then we may waste much time during this period. To avoid this, customers can tell Support the MD5 checksum of the upload files, requesting support to validate same if they have gotten the correct file in good format. MD5 on Linux We can use "md5sum" command directly. For example we calculate the file PrintManager.class MD5 checksum value. [jijichen@jclinux temp]$ md5sum PrintManager.class e0bf8c7623240ccd15ee17c0478427a1 PrintManager.class MD5 on Windows There are many freeware to calculate MD5 on internet. For example we can use WinMD5Free tool. You can download it from here. http://www.winmd5.com https://blogs.oracle.com/jiechen/resource/2013/winmd5free.zip

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• Script / App to unRAR files, and only delete the archives which were sucessfully expanded.

  - by Jeremy

  I have a cron job which runs a script to unrar all files in a certain directory (/rared for argument's sake) and place the expanded files in /unrared. I would like to change this script so that it deletes the original rar archives from /rared only if they successfully extracted. This does not mean that unrar has reported that they have been fully extracted, because I have had data corruption during decompression before. Ideally (pie-in-the-sky, just to give you an idea of what I'm shooting for,) the unrar program would include this functionality, comparing an expected md5sum value with the actual md5sum value and only deleting the archive if they match. I don't mind scripting this entire process if I have to, but there must be a better way than unraring twice and comparing md5sums.

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• vmware vmdk disk problem

  - by dmtr

  I have a VMware ESXi 4 server and 2 storage servers (mounted via nfs). Between the storage servers (Fedora 14) is a drbd cluster (dual primary) and ocfs2 filesystem; also every server has a local partition with an ext4 filesystem, both are mounted via nfs on the esxi server. When I tried to copy a virtual machine (naturally it was powered off) from the ext4 partition to the ocfs2 partition, the vmdk total file size is different, but the md5sum is the same. On the ext4 partition: # ls -la total 28492228 -rw------- 1 root root 42949672960 Jan 14 14:46 disk-flat.vmdk # md5sum disk-flat.vmdk 0eaebe3138beb32f54ea5de6dfe5a987 On the ocfs2 partition: # ls -la total 13974660 -rw------- 1 root root 42949672960 Jan 14 16:16 disk-flat.vmdk # md5sum disk-flat.vmdk 0eaebe3138beb32f54ea5de6dfe5a987 When I power on the virtual machine from the ocfs2 partition it dosn't work. I have a windows on the virtual machine and it freez?s after the windows logo. From the ext4 partition the virtual machine workes. I tested with linux (created and installed on ext4 partition and then copied to the ocfs2) and the same problem appears. When I create a virtual machine directly from ocfs2 partition, there are no problems. I tried to copy via vSphere client, and I have the same problem. Any suggestions?

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• vmware vmdk disk problem

  - by dmtr

  Hello, I have a vmware esxi 4 server and 2 storage servers (mount as nfs). Between the storage servers (fedora 14) is made drbd cluster (dual primary) and ocfs2 filesystem, also every server has local partition with ext4 filesystem, both are mounted as nfs on esxi server. When i tried to copy a virtual machine (naturally it power off) files from ext4 partition to ocfs2 partition, vmdk total file size is different, but md5sum is the same. on ext4 partition: # ls -la total 28492228 -rw------- 1 root root 42949672960 Jan 14 14:46 disk-flat.vmdk # md5sum disk-flat.vmdk 0eaebe3138beb32f54ea5de6dfe5a987 on ocfs2 partition: # ls -la total 13974660 -rw------- 1 root root 42949672960 Jan 14 16:16 disk-flat.vmdk # md5sum disk-flat.vmdk 0eaebe3138beb32f54ea5de6dfe5a987 When i power on the virtual machine from ocfs2 partition it dosn't work. I have a windows on the virtual machine and it freez?s after windows logo. From ext4 partition the virtual machine is worked. Test with linux (create and install on ext4 partition and copy) the same problem appears. When i create a virtual machine directly from ocfs2 partition, there are no problems. I tried to copy via vSphere client, and i have the same problem. Any suggestions ?

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• Strange rsync behaviour

  - by Stewie

  So, I start with comparing two directories: [root@135759 ]# rsync -av test1/ test2/ building file list ... done sent 128 bytes received 20 bytes 296.00 bytes/sec total size is 6 speedup is 0.04 They both are in sync Now, let me create a file in test1 and copy it to test2 [root@135759 ]# touch test1/hello4.php [root@135759 ]# scp test1/hello4.php test2/hello4.php I verify that those are same: [root@135759 test2]# md5sum test1/hello4.php d41d8cd98f00b204e9800998ecf8427e hello4.php [root@135759 test1]# md5sum test2/hello4.php d41d8cd98f00b204e9800998ecf8427e hello4.php Thus, running rsync will show me 0 files. Why is the output not right ? [root@135759 ]# rsync -avn test1/ test2/ building file list ... done hello4.php sent 116 bytes received 24 bytes 280.00 bytes/sec total size is 6 speedup is 0.04

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