blake2b

blake2b

Blake2b (64-bit version) in pure Javascript

This module is based on @dcposch implementation of BLAKE2b, with some changes:

• This module requires you to pass in a out buffer, saving an allocation
• This module allows you to set the salt and personal parameters
• This module exports constants for the parameters in libsodium style

All credit goes to @dcposch for doing the hard work of porting the implementation from C to Javascript.

Usage

var blake2b = require('blake2b')

var output = new Uint8Array(64)
var input = Buffer.from('hello world')

blake2b(output, input)

API

var out = blake2b(out, input, [key], [salt], [personal], [noAssert = false])

Hash input and write result to out, optionally with key, salt and personal. Bypass input assertions by setting noAssert to true.

All parameters must be Uint8Array, Buffer or another object with a compatible API. All parameters must also fulfill the following constraints, or an AssertionError will be thrown (unless noAssert = true):

• out must within the byte ranges defined by the constants below.
• input can be any length, including 0
• key is optional, but must within the byte ranges defined by the constants below, if given. This value must be kept secret, and can be used to create prefix-MACs.
• salt is optional, but must be exactly SALTBYTES, if given. You can use this parameter as a kind of per user id, or local versioning scheme. This value is not required to be secret.
• personal is optional, but must be exactly PERSONALBYTES, if given. You can use this parameter as a kind of app id, or global versioning scheme. This value is not required to be secret.

var instance = blake2b.instance(outlen, [key], [salt], [personal], [noAssert = false])

Like the above method, but allows your to update the hash as you can access more data. noAssert will also disable asserts in .update and .final methods. Note that outlen should be a number, and that you pass the Buffer in the .final method

var instance = instance.update(input)

Update the hash with new input. Calling this method after .final will throw an error.

var out = instance.final(out)

Finalise the the hash and write the digest to out. out must be exactly equal to outlen given in the .instance method.

Constants

• blake2b.BYTES_MIN Minimum length of out
• blake2b.BYTES_MAX Maximum length of out
• blake2b.BYTES Recommended default length of out
• blake2b.KEYBYTES_MIN Minimum length of key
• blake2b.KEYBYTES_MAX Maximum length of key
• blake2b.KEYBYTES Recommended default length of key
• blake2b.SALTBYTES Required length of salt
• blake2b.PERSONALBYTES Required length of personal

Install

npm install blake2b

Test vectors

This repository includes test vectors with {outlen, out, input, key, salt, personal} objects for testing conformance against the spec and other implementations:

• Lines 2 - 257 are tests for hashing with no key, taken from BLAKE2 test vectors
• Lines 258 - 513 are tests for hashing with keys, taken from BLAKE2 test vectors
• Lines 514- 577 are tests for hashing with key, salt and personalisation, derived from the libsodium tests

License

ISC