@alessiofrittoli/crypto-encoder

Crypto Encoder 🧮

Lightweight TypeScript encoder/decoder library

Table of Contents

• Getting started
• Base32
• Base64
• Encoder
• Development
  • Install depenendencies
  • Build the source code
  • ESLint
  • Jest
• Contributing
• Security
• Credits

---

Getting started

Run the following command to start using crypto-encoder in your projects:

npm i @alessiofrittoli/crypto-encoder

or using pnpm

pnpm i @alessiofrittoli/crypto-encoder

---

Supported input data types

This module supports different input data types and it uses the coerceToUint8Array utility function from @alessiofrittoli/crypto-buffer to convert it to a Uint8Array.

Here is the list of supported input data types (typed as CoerceToUint8ArrayInput):

• string
• Array<number> (array of bytes)
• DataView
• Buffer
• ArrayBuffer
• NodeJS.TypedArray
  • Uint8Array
  • Uint8ClampedArray
  • Uint16Array
  • Uint32Array
  • Int8Array
  • Int16Array
  • Int32Array
  • BigUint64Array
  • BigInt64Array
  • Float32Array
  • Float64Array

Base32

This module provides a Base32 utility class for encoding and decoding data according to various Base32 specifications.
It supports multiple Base32 variants and offers flexible options for encoding.

Overview

The Base32 class provides methods to encode and decode data using Base32, supporting multiple variants as defined by the following specifications:

• Base32 from RFC4648
• Base32hex from RFC4648
• Crockford's Base32

Variants

The following Base32 variants are supported:

• RFC3548 - Alias for RFC4648
• RFC4648 - The standard Base32 encoding.
• RFC4648-HEX - Base32 encoding with a hexadecimal-like alphabet.
• Crockford - A Base32 variant designed to be human-friendly.

API Reference

Static Properties

Base32.VARIANT

An object containing the available Base32 variants:

Base32.VARIANT = {
    RFC3548		: 'RFC3548',
    RFC4648		: 'RFC4648',
    RFC4648_HEX	: 'RFC4648-HEX',
    Crockford	: 'Crockford',
}

Static Methods

Base32.encode()

Encodes data to a Base32 string.

Parameters

Parameter	Type	Description
data	CoerceToUint8ArrayInput	The data to encode. See the list of supported input data types.
variant	Variant	The Base32 variant to use.
options	EncodeOptions	(Optional) Encoding options.
options.padding	boolean	If set, forcefully enable or disable padding. The default behavior is to follow the default of the selected variant.

Returns

Type: string

A Base32 encoded string.

Example usage

import { Base32 } from '@alessiofrittoli/crypto-encoder'
// or
import { Base32 } from '@alessiofrittoli/crypto-encoder/Base32'

console.log( Base32.encode( 'some value', 'RFC3548' ) )
// or
console.log( Base32.encode( 'some value', Base32.VARIANT.RFC3548 ) )
// Outputs: 'ONXW2ZJAOZQWY5LF'

---

Base32.decode()

Decodes a Base32 data.

Parameters

Parameter	Type	Description
data	CoerceToUint8ArrayInput	The Base32-encoded data. See the list of supported input data types.
variant	Variant	The Base32 variant used to encode the input.

Returns

Type: Uint8Array

An Uint8Array containing the decoded data.

Example usage

import { Base32 } from '@alessiofrittoli/crypto-encoder'
// or
import { Base32 } from '@alessiofrittoli/crypto-encoder/Base32'

const input		= 'ONXW2ZJAOZQWY5LF'
const decoded	= Base32.decode( input, 'RFC3548' )
// or
const decoded	= Base32.decode( input, Base32.VARIANT.RFC3548 )

console.log( Buffer.from( decoded ).toString() ) // Node.js
// or
console.log( new TextDecoder().decode( decoded ) ) // client-side
// or
console.log( Base32.toString( decoded ) ) // Node.js + client-side
// Outputs: 'some value'

---

Base64

This module provides a static Base64 utility class for encoding and decoding data to and from Base64/Base64url formats. It supports various input types and offers options for normalization between Base64 and Base64url formats.

Overview

The Base64 class provides static methods for:

• Encoding data to Base64/Base64url strings.
• Decoding Base64/Base64url strings to binary data.
• Normalizing strings between Base64 and Base64url formats.

The implementation is compatible with both browser and Node.js environments.

API Reference

Static Methods

Base64.encode()

Encodes data to a Base64 or Base64url string.

Parameters

Parameter	Type	Default	Description
data	CoerceToUint8ArrayInput	-	The data to encode. See the list of supported input data types.
normalize	boolean	true	Whether to normalize the output to Base64url.

Returns

Type: string

A Base64 or Base64url encoded string.

Example

import { Base64 } from '@alessiofrittoli/crypto-encoder'
// or
import { Base64 } from '@alessiofrittoli/crypto-encoder/Base64'

const data		= 'Hello, World!'
const base64	= Base64.encode( data, false )
const base64url	= Base64.encode( data )

console.log( base64 ) // Outputs: 'SGVsbG8sIFdvcmxkIQ=='
console.log( base64url ) // Outputs: 'SGVsbG8sIFdvcmxkIQ'

---

Base64.decode()

Decodes a Base64 or Base64url string.

Parameters

Parameter	Type	Description
data	CoerceToUint8ArrayInput	The Base64 or Base64url encoded data. See the list of supported input data types.

Returns

Type: Buffer | Uint8Array

A Buffer containing the decoded data.

Example

import { Base64 } from '@alessiofrittoli/crypto-encoder'
// or
import { Base64 } from '@alessiofrittoli/crypto-encoder/Base64'

const base64	= 'SGVsbG8sIFdvcmxkIQ=='
const base64url	= 'SGVsbG8sIFdvcmxkIQ'

console.log( Base64.toString( Base64.decode( base64 ) ) )
// or
console.log( Base64.toString( Base64.decode( base64url ) ) )
// Outputs: 'Hello, World!'

---

Encoder

The Encoder class provides static methods for encoding and decoding data using various encoding schemes, including custom ones like base32.

API Reference

Types

Encoding

Represents the encoding types supported by the Encoder class. Includes all standard BufferEncoding types as well as the custom base32 encoding.

Static Properties

Encoder.SUPPORTED_ENCODINGS

Type: Encoding[]

A list of all encodings supported by the Encoder class. Includes standard BufferEncoding types and the custom base32 encoding.

Static Methods

Encoder.encode()

Encodes the provided data using the specified encoding scheme.

Parameters

Parameter	Type	Default	Description
data	CoerceToUint8ArrayInput	-	The data to encode. See the list of supported input data types.
encoding	Encoding	utf8	(Optional) The output encoding.
inputEncoding	Encoding	-	(Optional) The encoding of the input data.

Returns

Type: string

The encoded data as a string.

Behavior

• If encoding is base32, uses the Base32 class with the RFC3548 standard.
• If encoding is base64 or base64url, uses the Base64 class.
• Otherwise, falls back to Buffer (if available) or the binaryToString function for encoding.

Example

import { Encoder } from '@alessiofrittoli/crypto-encoder'
// or
import { Encoder } from '@alessiofrittoli/crypto-encoder/Encoder'

const data = 'Hello, world!'
const buffer = Buffer.from( data )
const bytes = [
    72, 101, 108, 108, 111,
    44,  32, 119, 111, 114,
    108, 100,  33
]

console.log( Encoder.encode( data, 'hex' ) )
console.log( Encoder.encode( data, 'base32' ) )
console.log( Encoder.encode( data, 'base64' ) )
console.log( Encoder.encode( buffer ) )
console.log( Encoder.encode( bytes ) )

---

Encoder.decode()

Decodes the provided data using the specified encoding scheme.

Parameters

Parameter	Type	Description
data	CoerceToUint8ArrayInput	The input data to decode. See the list of supported input data types.
encoding	Encoding	The encoding of the input data.

Returns

Type: Buffer | Uint8Array

A Buffer containing the decoded data.

Behavior

• If encoding is base32, uses the Base32 class with the RFC3548 standard.
• If encoding is base64 or base64url, uses the Base64 class.
• Otherwise, falls back to Buffer (if available) or coerces the input data to a Uint8Array.

Example

import { Encoder } from '@alessiofrittoli/crypto-encoder'
// or
import { Encoder } from '@alessiofrittoli/crypto-encoder/Encoder'

const decoded = Encoder.decode( 'JBSWY3DPFQQHO33SNRSCC===', 'base32' )
console.log( Encoder.toString( decoded ) ) // Outputs: 'Hello, world!'

---

Development

Install depenendencies

npm install

or using pnpm

pnpm i

Build the source code

Run the following command to test and build code for distribution.

pnpm build

ESLint

warnings / errors check.

pnpm lint

Jest

Run all the defined test suites by running the following:

# Run tests and watch file changes.
pnpm test:watch

# Run tests in a CI environment.
pnpm test:ci

• See package.json file scripts for more info.

Run tests with coverage.

An HTTP server is then started to serve coverage files from ./coverage folder.

⚠️ You may see a blank page the first time you run this command. Simply refresh the browser to see the updates.

test:coverage:serve

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Contributing

Contributions are truly welcome!

Please refer to the Contributing Doc for more information on how to start contributing to this project.

Help keep this project up to date with GitHub Sponsor.

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Security

If you believe you have found a security vulnerability, we encourage you to responsibly disclose this and NOT open a public issue. We will investigate all legitimate reports. Email [e-mail] to disclose any security vulnerabilities.

Made with ☕

Alessio Frittoli https://alessiofrittoli.it | [e-mail]