feat(reset): ResetDevice.dice_only selects the dice-only derivation - #122
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feat(reset): ResetDevice.dice_only selects the dice-only derivation#122BitHighlander wants to merge 2 commits into
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dice_entropy alone is now the MIXED mode: the device commits its own 32-byte
draw as 24 BIP-39 words before the rolls are entered, then derives
seed = SHA256d("KK\x01SM" || draw || SHA256("KK\x01D" || rolls)). With
dice_only the derivation is seed = SHA256(rolls) and the draw is discarded,
matching Coldcard's Dice-Rolls-Only byte for byte.
The mode is a host-side selection so a wallet can explain what is coming --
99 rolls, and for MIXED 24 words to copy down -- before the ceremony starts.
The device still shows a consent screen naming the mode the host chose, so a
host cannot select dice-only silently. In both modes the host's EntropyAck is
consumed and its bytes dropped; the wire flow is otherwise unchanged.
dice_only without dice_entropy is rejected with a SyntaxError.
Reports that ResetDevice.dice_only, the on-device consent screen and the tagged MIXED derivation are implemented. Needed because nanopb skips unknown fields: a host that sends dice_only to older firmware gets the older ceremony and a different wallet, with no error. Hosts and the test suite gate on this bit rather than on a version.
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One field.
dice_entropyalone becomes the MIXED mode (device draw shown as 24 words before rolling,seed = SHA256d("KK\x01SM" || draw || SHA256("KK\x01D" || rolls))); withdice_onlythe derivation isseed = SHA256(rolls), Coldcard's Dice-Rolls-Only byte for byte. Host-side selection so a wallet can explain what is coming; the device shows a consent screen naming the mode.dice_onlywithoutdice_entropyis refused.Firmware unit: BitHighlander/keepkey-firmware
audit/715-dice-only. Host tests: keepkey/python-keepkeyfeat/dice-modes.A twin of this commit on the products' current pin (
feat/dice-only-field-7.14.3, off8545cd5b6) is what the firmware unit pins, because the products lack.optionsfor the EIP-712 streaming fields between8545cd5b6and this branch's base. It retires when the products advance toup/release-protocol.Draft: not to be merged until the firmware unit is accepted on both products.