Error: Private key must be less than the curve order about bip39

[MajorChump]

If anyone encounters this problem, in my case it was down to using an older version of the npm Buffer library (< 4).

npm install buffer fixed the issue be updating the library. Thanks for the help @dcousens, closing ticket.

[MajorChump]

Right think its something to do with the Uint8Array.slice() in HDNode.fromSeedBuffer

I don't know why but they're both returning full arrays of 64 elements instead of the 32. Thought it might be a bug in FF but its happening in chrome too. I guess the issue must be Meteor messing with typedarray methods or similar? Any thoughts? I'll dig into Meteor now see if I can see anything

var IL = I.slice(0, 32)
var IR = I.slice(32)

[dcousens]

I assume its something down to Buffer in the browser?

Potentially.
Can you console.log(mnemonicSeedHex) and show it here?

NOTE: this is your private key, if you have funds associated with it, don't publish it here.

[MajorChump]

Sure

Mnemonic: message foot patrol now film mansion spy wide bean latin unhappy toe
SeedHex: 364a3f598f18728aad44ddcac53b45cfd510cb67679e940366c0500b026de2d642acaaa8ee7777d76b0a1e40c730294f0bf6a649cd6791b13446adaf41ea9da1

(no funds empty wallets generated in the browser)

[dcousens]

Using

let bitcoin = require('bitcoinjs-lib')
let bip39 = require('bip39')

let mnemonic = 'message foot patrol now film mansion spy wide bean latin unhappy toe'
let seedHex = bip39.mnemonicToSeedHex(mnemonic)
let node = bitcoin.HDNode.fromSeedHex(seedHex)

console.log({
  mnemonic,
  seed: seedHex,
  node: node.toBase58()
})

{
  "mnemonic": "message foot patrol now film mansion spy wide bean latin unhappy toe",
  "seed": "364a3f598f18728aad44ddcac53b45cfd510cb67679e940366c0500b026de2d642acaaa8ee7777d76b0a1e40c730294f0bf6a649cd6791b13446adaf41ea9da1",
  "node": "xprv9s21ZrQH143K2SMXRvyZbVP6dEkPHmRb6cf7yDaco8v8eoKhXHqNy9SBtzTsg9QvEHedh6HU4Khxwb22dYiiS69W8Ny9X33PX5UMEhCR44o"
}

Could not reproduce Error: Private key must be less than the curve order.

Could you try and print out what the private key is before it reaches Error: Private key must be less than the curve order? You'll need to look through your node_modules and inject some code into ECPair.
This definitely looks to be a meteorjs issue.

Could not reproduce with browserify, too.