Online MD5 Hash Generator

How can I open an image in PIL, then print the md5 hash of the image without saving it to a file and reading the file?

I did my research but couldn't find any thing on the net.

There are sites explaining the algorithm but no one is solving it by example.

and the built in classes i can't see what they do and how.

I have an API route that proxies a file upload from the browser/client to AWS S3.

This API route attempts to stream the file as it is uploaded to avoid buffering the entire contents of the file in memory on the server.

However, the route also attempts to calculate an MD5 checksum of the file's body. As each part of the file is chunked, the hash.update() method is invoked w/ the chunk.

http://nodejs.org/api/crypto.html#crypto_hash_update_data_input_encoding

var crypto = require('crypto');var hash = crypto.createHash('md5');function write (chunk) {  // invoked many times as file is uploaded  hash.update(chunk);}function done() {  // will hash buffer all chunks in memory at this point?  hash.digest('hex');}

Will the instance of Hash buffer all the contents of the file in order to perform the hash calculation (thus defeating the goal of avoiding buffering the entire file's contents in memory)? Or can an MD5 hash be calculated incrementally, without ever having the entire input available to perform the calculation?

I have the md5 and sha256 hash of a file, I would like to calculate the size of the file from the hash value.

Is there any way to get the size of a file with md5 or sha256 hash of that file available with us ?

I have 2 string (hash), one md5 and one sha256.

sha256 = 85dc1d69a90a50347ce0608fe09e41bee9d03a61f704a0736474cd003fa38533

and

md5 = c228ed03a1980ce58852b63df5bf6022

i can convert this sha256 to this md5 but i cant convert this md5 to this sha256 .

What should I do ? how can i to convert this md5 to this sha256 ?