md5

Using the HTML5 File API and any JavaScript crypto library, how can I generate an MD5 hash of the file? To read the file: var reader = new FileReader(); reader.onload = function(e) { var contents = e.target.result; // What goes here? }; reader.readAsBinaryString(data.files[0]); This goes there: var reader = new FileReader(); reader.onload = function(e) { var contents = e.target.result; // This goes here: var hash = CryptoJS.MD5(CryptoJS.enc.Latin1.parse(contents)); }; Be sure you include the CryptoJS library: <script src="http://crypto-js.googlecode.com/svn/tags/3.1.2/build/rollups/md5.js"><

I'm doing a bit of reading on hashing for passwords. I've seen that SHA-256 > MD5. This got me thinking about how an app may deal with changing from one hashing function to another. What happens if someone implements an app that hashes their passwords using MD5. They then decide that SHA-256 is the way to go. But of course the password hashes stored in the database are in MD5. What is the process for migrating the data in the database from one hashing function to another? Thomas Pornin It is not possible to "unhash" passwords (at least not in a general, efficient and reliable way -- you can

Is making system call to "md5sum file1" and "md5sum file2" and compare two return values enough in this case? Well, that will tell you whether they're definitely different or probably the same. It's possible for two files to have the same hash but not actually have the same data... just very unlikely. In your situation, what is the impact if you get a false positive (i.e. if you think they're the same, but they're not)? MD5 is probably good enough not to worry about collisions if they would only occur accidentally ... but if you've got security (or money) at stake and someone could plant a

Using Haskell, how can I compute the MD5 digest of a file without using external tools like md5sum ? Note: This question intentionally shows no effort as I answered it right away. One option is to use the pureMD5 package, for example if you want to compute the hash of the file foo.txt : import qualified Data.ByteString.Lazy as LB import Data.Digest.Pure.MD5 main :: IO () main = do fileContent <- LB.readFile "foo.txt" let md5Digest = md5 fileContent print md5Digest This code prints the the same MD5 sum as md5sum foo.txt . If you prefer a one-liner, you can use this one (the imports are the same

First, i should say that I am relatively new to programming so please be gentle with me if this is a naive or dumb question. Ok, so I am in the process of writing a small application, part of which will involve hashing user passwords. After researching the best way to do this, md5 appears as a suggestion, almost as many times as it appears in articles criticizing its use. The alternatives are the likes of SHA-1 etc which are stronger and less likely to be cracked. This makes perfect sense. To get to the point: Why is md5 still widely used for hashing Should I automatically discount md5 for