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Subwallets, Part 1: basic framework and subwallet generation

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Beginning with this commit, every MMGen wallet now has a two sets of associated
subwallets with “long“ and “short” seeds.

MMGen wallets and subwallets are functionally equivalent and externally
indistinguishable.  This has benefits, especially for real-world security, as
well as drawbacks.  For more information, see the `mmgen-subwalletgen` help
screen: https://github.com/mmgen/mmgen/wiki/subwalletgen-[MMGen-command-help]

This patch provides subwallet generation functionality and subseed display
utilities.  Support for transaction signing and address generation using a
subwallet's parent wallet will be added in a forthcoming patch.

Examples:

    # Create a bogus wallet in mnemonic format for testing purposes:
    $ echo $(yes bee | head -n24) > bogus.mmwords

    # List the wallet's first five subseed pairs:
    $ mmgen-tool list_subseeds 1-5 wallet=bogus.mmwords
    Parent Seed: DF449DA4 (256 bits)

     Long Subseeds     Short Subseeds
     -------------     --------------
      1L: FC9A8735       1S: 930E1AD5
      2L: 62B02F54       2S: DF14AB49
      3L: 9E884E99       3S: AD3ABD98
      4L: DB595AE1       4S: 3E885EC4
      5L: 36D5A0D1       5S: 30D66FF5

    # Generate the 5th short (128-bit) subwallet from the wallet:
    $ mmgen-subwalletgen bogus.mmwords 5S

    # Same as above, but output subwallet to mnemonic (seed phrase) format:
    $ mmgen-subwalletgen -o mn bogus.mmwords 5S
    ...
    Mnemonic data written to file '30D66FF5[128].mmwords'

    # View the subwallet's seed phrase:
    $ cat 30D66FF5[128].mmwords
    object capture field heart page observe road bond mother loser really army

    # Generate 10 addresses from the subwallet seed phrase:
    $ mmgen-addrgen 30D66FF5[128].mmwords 1-10
    ...
    Addresses written to file '30D66FF5[1-10].addrs'
This commit is contained in:
The MMGen Project 2019-05-12 12:29:35 +00:00
commit 7538a9460e
Signed by: mmgen
GPG key ID: 3F8B1861E32B7DA2
16 changed files with 527 additions and 11 deletions
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cmds/mmgen-subwalletgen Executable file
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#!/usr/bin/env python3
# mmgen = Multi-Mode GENerator, command-line Bitcoin cold storage solution
# Copyright (C)2013-2019 The MMGen Project <mmgen@tuta.io>
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program. If not, see <http://www.gnu.org/licenses/>.
"""
mmgen-subwalletgen: Generate a subwallet from an MMGen deterministic wallet
"""
from mmgen.main import launch
launch("subwalletgen")