base-x-native

This is a fork of https://github.com/cryptocoinjs/base-x that uses a native module written in Rust to do computations: base encoding / decoding of any given alphabet using bitcoin style leading zero compression.

Rust module: https://github.com/OrKoN/base-x-rs

Many thanks to dignifiedquire for cleaning up this module and making it really fast.

Benchmark: Rust version vs JS version

Example

Base58

var BASE58 = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
var bs58 = require('base-x-native')(BASE58)

var decoded = bs58.decode('5Kd3NBUAdUnhyzenEwVLy9pBKxSwXvE9FMPyR4UKZvpe6E3AgLr')

console.log(decoded)
// => <Buffer 80 ed db dc 11 68 f1 da ea db d3 e4 4c 1e 3f 8f 5a 28 4c 20 29 f7 8a d2 6a f9 85 83 a4 99 de 5b 19>

console.log(bs58.encode(decoded))
// => 5Kd3NBUAdUnhyzenEwVLy9pBKxSwXvE9FMPyR4UKZvpe6E3AgLr

Alphabets

See below for a list of commonly recognized alphabets, and their respective base.

Base | Alphabet ------------- | ------------- 11 | 0123456789a 16 | 0123456789abcdef 32 | 0123456789ABCDEFGHJKMNPQRSTVWXYZ 36 | 0123456789abcdefghijklmnopqrstuvwxyz 58 | 123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz 62 | 0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ 64 | ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/ 66 | ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.!~

How it works

It encodes octet arrays by doing long divisions on all significant digits in the array, creating a representation of that number in the new base. Then for every leading zero in the input (not significant as a number) it will encode as a single leader character. This is the first in the alphabet and will decode as 8 bits. The other characters depend upon the base. For example, a base58 alphabet packs roughly 5.858 bits per character.

This means the encoded string 000f (using a 0-f alphabet) will actually decode to 4 bytes unlike a typical hex codec which uniformly packs 4 bits into each character.

While unusual, this does mean that no padding is required and it works for bases like 43. If you need standard hex encoding or base64 encoding you probably don't want this.

The algorithm used to convert the base of the number is roughly this:

significant =  12345
base = 16
digits = []
while significant > base:
  significant, remainder = divmod(significant, base)
  digits.append(remainder)
digits.append(significant)
assert list(reversed(digits)) == [3,0,3,9]
assert hex(12345) == '0x3039'

Of course the input is actually an array of digits already :)

License

This library is free and open-source software released under the MIT license.