Online MD5 Hash Generator

Should I expect these md5sums to be the same?

url = 'http://stackoverflow.com/opensearch.xml'shl = paste0('curl -s ', url, '|md5sum')shell(shl, intern = T)#"1dbeef7406e5054197382916ff72e29b *-"fl = 'temp.xml'download.file(url = url, destfile = fl, mode = 'wb')tools::md5sum(fl)#"96bdf6d80c0bb6e27620079e2f6f7237" 

If not, is comparing files like this generally possible?

Or is there another method to check that files are not corrupted during download if the source does not provide checksum?

UPDATE:

url = 'https://www.ncl.ucar.edu/Applications/Data/bin/latlon.bin'shl = paste0('curl -sL ', url, '|md5sum')shell(shl, intern = T)#"d41d8cd98f00b204e9800998ecf8427e *-"fl = 'temp'download.file(url = url, destfile = fl, mode = 'wb')tools::md5sum(fl)#"1a1eeb7a09418f047588148395096b91" 

It seems to return different md5 values if the file is .bin

I want to convert a string like "abc" to an MD5 hash. I want to do this in iOS and Swift. I have tried using the solutions below but they were not working for me:

Importing CommonCrypto in a Swift framework

How to use CC_MD5 method in swift language.

http://iosdeveloperzone.com/2014/10/03/using-commoncrypto-in-swift/

To be more clear, I want to achieve an output in Swift similar to this PHP code's output:

$str = "Hello";echo md5($str);

Output: 8b1a9953c4611296a827abf8c47804d7

Using C#, I want to create an MD5 hash of a text file. How can I accomplish this?

Update: Thanks to everyone for their help. I've finally settled upon the following code -

// Create an MD5 hash digest of a filepublic string MD5HashFile(string fn){                byte[] hash = MD5.Create().ComputeHash(File.ReadAllBytes(fn));    return BitConverter.ToString(hash).Replace("-", "");            }

I've tried to change multer/storage/disk.js file so I can storage a hash everytime I upload a file, but the fact is that I'm always getting the same hash even uploading different files.

This is what I've done.

DiskStorage.prototype._handleFile = function _handleFile (req, file, cb) {  var that = this  var hash = crypto.createHash('sha256')  that.getDestination(req, file, function (err, destination) {    if (err) return cb(err)    that.getFilename(req, file, function (err, filename) {      if (err) return cb(err)      var finalPath = path.join(destination, filename)      var outStream = fs.createWriteStream(finalPath)      file.stream.pipe(outStream)      outStream.on('error', cb)      outStream.on('data', function (chunk) {        hash.update(chunk)      })      outStream.on('finish', function () {        cb(null, {          destination: destination,          filename: filename,          path: finalPath,          size: outStream.bytesWritten,          hash: hash.digest('hex')        })      })    })  })}

It' s like this section isn't doing anything

outStream.on('data', function (chunk) {        hash.update(chunk)      })

I'm reading image files with FileReader().readAsArrayBuffer() and I'm using the md5 library to create a hash of the file. The readAsArrayBuffer() returns an ArrayBuffer.

const reader = new FileReader();reader.onload = (event) => {  // NEED TO CREATE TYPED ARRAY FROM  const binary = new Uint8Array(event.target.result);  const md5Hash = md5(binary);};reader.readAsArrayBuffer(imageFile);

From MDN ArrayBuffer

We get that:

The ArrayBuffer object is used to represent a generic, fixed-length raw binary data buffer.

It is an array of bytes, often refered to in other languages as a "byte array".

You cannot directly manipulate the contents of an ArrayBuffer; instead, you create one of the typed array objects or a DataView object which represents the buffer in a specific format, and use that to read and write the contents of the buffer.

Thus, I can't use directly into the md5 function, I need first to acreate on of the type array objects.

My options are:

• Int8Array
• Uint8Array
• Int16Array
• Int32Array

Which one of the above should I use in my code? And why?

More info: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray