@cumulus/checksum

Checksum

The @cumulus/checksum library provides checksum functionality used by Cumulus packages and tasks. Currently the supported input includes file streams, and supported checksum algorithms include cksum and the algorithms available to the crypto package, as documented here.

Usage

const fs = require('fs');
const { generateChecksumFromStream } = require('@cumulus/checksum');

const stream = fs.createReadStream('myDataFile.hdf');
const myCksum = generateChecksumFromStream('cksum', stream);

API

checksum

• checksum
  • .generateChecksumFromStream(algorithm, stream, [options]) ⇒ Promise.<(number|string)>
  • .validateChecksumFromStream(algorithm, stream, expectedSum, [options]) ⇒ Promise.<boolean>

checksum.generateChecksumFromStream(algorithm, stream, [options]) ⇒ Promise.<(number|string)>

Create file checksum from readable stream

Kind: static method of checksum
Returns: Promise.<(number|string)> - the file checksum

Param	Type	Description
algorithm	string	Checksum algorithm type
stream	stream.Readable	A readable file stream
[options]	Object	Checksum options, see crypto.createHash()

checksum.validateChecksumFromStream(algorithm, stream, expectedSum, [options]) ⇒ Promise.<boolean>

Validate expected checksum against calculated checksum

Kind: static method of checksum
Returns: Promise.<boolean> - whether expectedSum === calculatedSum

Param	Type	Description
algorithm	string	Checksum algorithm
stream	stream.Readable	A readable file stream
expectedSum	number | string	expected checksum
[options]	Object	Checksum options

About Cumulus

Cumulus is a cloud-based data ingest, archive, distribution and management prototype for NASA's future Earth science data streams.

Cumulus Documentation

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