Can you use OpenSSL to generate an md5 or sha hash on a directory of files?

Posted by Kieveli on Super User See other posts from Super User or by Kieveli
Published on 2009-11-19T18:38:37Z Indexed on 2010/05/27 8:22 UTC
Read the original article Hit count: 292

Filed under:

hash

|

md5

|

openssl

|

SHA

I'm interested in storing an indicator of file / directory integrity between two archived copies of directories. It's around 1TB of data stored recursively on hard drives. Is there a way using OpenSSL to generate a single hash for all the files that can be used as a comparison between two copies of the data, or at a later point to verify the data has not changed?

© Super User or respective owner

Related posts about hash

Problem with hash function: hash(1) == hash(1.0)

as seen on Stack Overflow - Search for 'Stack Overflow'
I have an instance of dict with ints, floats, strings as keys, but the problem is when there are a as int and b as float, and float(a) == b, then their hash values are the same, and thats what I do NOT want to get because I need unique hash vales for this cases in order to get corresponding values… >>> More
Hash table vs Hash list vs Hash tree?

as seen on Stack Overflow - Search for 'Stack Overflow'
What property makes Hash table, Hash list and Hash tree different from each other? Which one is used when? When is table superior than tree. >>> More
Constructing a hash table/hash function.

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I would like to construct a hash table that looks up keys in sequences (strings) of bytes ranging from 1 to 15 bytes. I would like to store an integer value, so I imagine an array for hashing would suffice. I'm having difficulty conceptualizing how to construct a hash function such that given… >>> More
Hash of unique value = unique hash?

as seen on Stack Overflow - Search for 'Stack Overflow'
Theoretically does hashing a unique value yield a unique value? Let's say I have a DB table with 2 columns: id and code. id is an auto-incrementing int and code is a varchar. If I do ... $code = sha1($id); ... and then store $code into the same row as $id. Will my code column be unique as well… >>> More
EMERGENCY - Major Problems After Perl Module Installed via WHM

as seen on Stack Overflow - Search for 'Stack Overflow'
I attempted to install the perl module Net::Twitter::Role::API::Lists using WHM and after doing so my whole site came down. It seems that something that was updated with the install isn't functioning correctly and since our website it written in Perl none of our site scripts will run. In almost 8… >>> More

Related posts about md5

Getting Oracle's MD5 to match PHP's MD5

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi all, I'm trying to compare an MD5 checksum generated by PHP to one generated by Oracle 10g. However it seems I'm comparing apples to oranges. Here's what I did to test the comparison: //md5 tests //php md5 print md5('testingthemd5function'); print '<br/><br/>'; //oracle… >>> More
Python: How to display the calculated MD5 value in my browser?

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, I was given this Python code that would calculate an MD5 value for any phrase: import md5 md5.new("Nobody inspects the spammish repetition").digest() (The phrase here is: "Nobody inspects the spammish repetition") What I want to do is display this value in my browser. How do I do it in… >>> More
How are hash functions like MD5 unique?

as seen on Stack Overflow - Search for 'Stack Overflow'
Im aware that MD5 has had some collisions but this is more of a high level question about hashing functions. If MD5 hashes any arbitrary string into a 32-digit hex value, then according to the Pigeonhole Principle surely this can not be unique as there are more unique arbitrary strings than there… >>> More
Converting a md5 hash byte array to a string

as seen on Stack Overflow - Search for 'Stack Overflow'
How can I convert the hashed result, which a byte array, to a string? byte[] bytePassword = Encoding.UTF8.GetBytes(password); using (MD5 md5 = MD5.Create()) { byte[] byteHashedPassword = md5.ComputeHash(bytePassword); } So I need to convert… >>> More
How do I compare the md5sum of a file with the md5 file (that was available to download with the file)?

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
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… >>> More