Different Values for MD5 between Ruby and JavaScript -

i need able run md5 hash on same file clientside javascript app , on server ruby.

currently cannot both hashes identical.

on client, i'm using jquery file upload upload file s3 bucket. using crypto hash file in callback:

file =  data.files[0] filename = file.name; md5 = cryptojs.md5(cryptojs.enc.hex.parse(data.files[0].tostring())); 

this gives me: ee9cd5bf4272fc35bd57d184553bd25b

in ruby, it's module digest::md5 module used gem doing hashing:

digest::md5.file(file).to_s 

this gives me: 4d51c9a4d3fd076489d6c96614ebce61

i have no control on ruby side of things, why might checksum generated crypto different?

note can test locally, using same api:

path = 'path/to/file.jpg' digest::md5.file(f).hexdigest # 4d51c9a4d3fd076489d6c96614ebce61 

the file large jpg (~ 1.8meg)

update: in response @kxyz's answer, results using different encoders crypto-js are:

cryptojs.md5(cryptojs.enc.hex.parse(data.files[0].tostring())); // ee9cd5bf4272fc35bd57d184553bd25b  cryptojs.md5(cryptojs.enc.utf8.parse(data.files[0].tostring())); // 709d1d31dc47636e4f5ccbfd07601c19  cryptojs.md5(cryptojs.enc.latin1.parse(data.files[0].tostring())); // 709d1d31dc47636e4f5ccbfd07601c19 

i've checked both orginal file copied file downloaded s3 using bash md5 generated same hash both files:

4d51c9a4d3fd076489d6c96614ebce61 identical hash being generated ruby.

also checked hash using online hasher:

4d51c9a4d3fd076489d6c96614ebce61

you use cryptojs.enc.latin1 , in ruby don't define encoding digest::md5.file(file).to_s. sure use same encoding.

try

digest::md5.hexdigest('foobar') 

and

cryptojs.md5(cryptojs.enc.hex.parse('foobar'));