Python, get base64-encoded MD5 hash of an image object -

i need base64-encoded md5 hash of object, object image stored file, fname.

i've tried this:

def get_md5(fname):     hash = hashlib.md5()     open(fname) f:         chunk in iter(lambda: f.read(4096), ""):             hash.update(chunk)     return hash.hexdigest().encode('base64').strip() 

however, don't think right because returns string many characters. understanding needs 24 characters long. get

njjim2rlowmzotyxymm3mdi5y2q1nzdjotq5ywrlytq= 

i've tried few other similar ways well, example, 1 not chunk loop thing. return same string.

(my later actions need base64-encoded md5 hash fail, , i'm thinking why.)

i able make work using digest() instead of hexdigest(). last line becomes:

return hash.digest().encode('base64').strip() 

the result 24 characters long, , accepted google cloud storage transfer, required base64-encoded md5 hash.