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@cumulus/checksum

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@cumulus/checksum

Cumulus checksum utilities

  • 1.23.1
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  • npm
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174
increased by35.94%
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@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)>

Create file checksum from readable stream

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

ParamTypeDescription
algorithmstringChecksum algorithm type
streamstream.ReadableA readable file stream
[options]ObjectChecksum 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

ParamTypeDescription
algorithmstringChecksum algorithm
streamstream.ReadableA readable file stream
expectedSumnumber | stringexpected checksum
[options]ObjectChecksum 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


Generated automatically using npm run build-docs

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Package last updated on 26 May 2020

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