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+# Sumchecker
+
+[![Travis CI](https://travis-ci.org/malept/sumchecker.svg?branch=master)](https://travis-ci.org/malept/sumchecker)
+[![AppVeyor CI](https://ci.appveyor.com/api/projects/status/wm4n2r11nlff8ify?svg=true)](https://ci.appveyor.com/project/malept/sumchecker)
+[![Code Coverage](https://codecov.io/gh/malept/sumchecker/branch/master/graph/badge.svg)](https://codecov.io/gh/malept/sumchecker)
+![Dependency Status](https://tidelift.com/badges/github/malept/sumchecker)
+
+
+Sumchecker is a pure Node.js solution to validating files specified in a checksum file, which are
+usually generated by programs such as [`sha256sum`](https://en.wikipedia.org/wiki/Sha256sum).
+
+## Usage
+
+```javascript
+const sumchecker = require('sumchecker');
+
+try {
+  await sumchecker(algorithm, checksumFilename, baseDir, filesToCheck);
+  console.log('All files validate!');
+} catch (error) {
+  console.error('An error occurred', error);
+}
+```
+
+Returns a [`Promise`]. The promise is resolved when all files specified in
+[`filesToCheck`](#filesToCheck) are validated. The promise is rejected otherwise.
+
+### Parameters
+
+#### `algorithm`
+
+`String` - The hash algorithm used in [`checksumFilename`](#checksumFilename). Corresponds to the
+algorithms allowed by [`crypto.createHash()`].
+
+#### `checksumFilename`
+
+`String` - The path to the checksum file.
+
+#### `baseDir`
+
+`String` - The base directory for the files specified in [`filesToCheck`](#filesToCheck).
+
+#### `filesToCheck`
+
+`Array` or `String` - one or more paths of the files that will be validated, relative to
+[`baseDir`](#baseDir).
+
+### Errors
+
+These are `sumchecker`-specific error classes that are passed to the promise's reject callback.
+
+#### `sumchecker.ChecksumMismatchError`
+
+When at least one of the files does not match its expected checksum.
+
+Properties:
+
+* `filename` (`String`) - a path to a file that did not match
+
+#### `sumchecker.ChecksumParseError`
+
+When the checksum file cannot be parsed (as in, it does not match the checksum file format).
+
+Properties:
+
+* `lineNumber` (`Number`) - the line number that could not be parsed
+* `line` (`String`) - the raw line data that could not be parsed, sans newline
+
+#### `sumchecker.NoChecksumFoundError`
+
+When at least one of the files specified to check is not listed in the checksum file.
+
+Properties:
+
+* `filename` (`String`) - a filename from [`filesToCheck`](#filesToCheck)
+
+## Support
+
+[Get supported sumchecker with the Tidelift Subscription](https://tidelift.com/subscription/pkg/npm-sumchecker?utm_source=npm-sumchecker&utm_medium=referral&utm_campaign=readme).
+
+## Security contact information
+
+To report a security vulnerability, please use the [Tidelift security
+contact](https://tidelift.com/security). Tidelift will coordinate the fix and disclosure.
+
+## Legal
+
+This library is copyrighted under the terms of the [Apache 2.0 License].
+
+[`crypto.createHash()`]: https://nodejs.org/dist/latest-v4.x/docs/api/crypto.html#crypto_crypto_createhash_algorithm
+[`Promise`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise
+[Apache 2.0 License]: http://www.apache.org/licenses/LICENSE-2.0