curl -X POST https://upload.box.com/api/2.0/files/upload_sessions/F971964745A5CD0C001BBE4E58196BFD/commit \
     -H 'Authorization: Bearer <ACCESS_TOKEN>'
     -H "Digest: sha=fpRyg5eVQletdZqEKaFlqwBXJzM=" \
     -H 'Content-Type: application/json" '
     -d '{
       "parts": [
         {
           "part_id": "BFDF5379",
           "offset": 0,
           "size": 8388608,
	   "sha1": "134b65991ed521fcfe4724b7d814ab8ded5185dc"
         },
		     {
           "part_id": "E8A3ED8E",
           "offset": 8388608,
           "size": 1611392,
	   "sha1": "234b65934ed521fcfe3424b7d814ab8ded5185dc"
         }
       ],
       "attributes": {
         "content_modified_at": "2017-04-08T00:58:08Z"
       }
     }'

//Creates the file hash
byte[] digestBytes = digest.digest();
//Base64 encoding of the hash
String digestStr = Base64.encode(digestBytes);

//Commit the upload session. If there is a failure, abort the commit.
BoxFile.Info fileInfo = session.commit(digestStr, parts, null, null, null);

import hashlib

sha1 = hashlib.sha1()
# sha1 should have been updated with all the bytes of the file

file_atributes = {
    'description': 'A file uploaded via Chunked Upload',
}

upload_session = client.upload_session('11493C07ED3EABB6E59874D3A1EF3581')
uploaded_file = upload_session.commit(sha1.digest(), file_atributes=file_atributes)
print('Successfully uploaded file {0} with description {1}'.format(uploaded_file.id, uploaded_file.description))

// Finalize upload session 93D9A837B45F
client.files.commitUploadSession(
	'93D9A837B45F',
	fileHash.digest('base64'),
	{description: 'A file I uploaded in chunks!'},
	callback
);