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Code Issues Releases Wiki Activity

legacy/signing.c: Revert formatting of the workflow of streamed signing.

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This commit is contained in:
Andrew Kozlik 2019-10-11 11:03:14 +02:00
parent e688fa8775
commit 15d8f9def6
1 changed files with 40 additions and 18 deletions
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58
legacy/firmware/signing.c
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@ -118,6 +118,7 @@ enum {
#define PROGRESS_PRECISION 16
/*
clang-format off
Workflow of streamed signing
The STAGE_ constants describe the signing_stage when request is sent.
@ -131,20 +132,29 @@ Phase1 - check inputs, previous transactions, and outputs
=========================================================
foreach I (idx1):
Request I STAGE_REQUEST_1_INPUT Add I to segwit hash_prevouts, hash_sequence
Request I STAGE_REQUEST_1_INPUT
Add I to segwit hash_prevouts, hash_sequence
Add I to Decred decred_hash_prefix
Add I to TransactionChecksum (prevout and type)
if (Decred)
Return I
If not segwit, Calculate amount of I:
Request prevhash I, META STAGE_REQUEST_2_PREV_META foreach prevhash I
(idx2): Request prevhash I STAGE_REQUEST_2_PREV_INPUT foreach prevhash O (idx2):
Request prevhash O STAGE_REQUEST_2_PREV_OUTPUT Add amount of
prevhash O (which is amount of I) Request prevhash extra data (if applicable)
STAGE_REQUEST_2_PREV_EXTRADATA Calculate hash of streamed tx, compare to
prevhash I foreach O (idx1): Request O STAGE_REQUEST_3_OUTPUT Add O to Decred
decred_hash_prefix Add O to TransactionChecksum if (Decred) Return O Display
output Ask for confirmation
Request prevhash I, META STAGE_REQUEST_2_PREV_META
foreach prevhash I (idx2):
Request prevhash I STAGE_REQUEST_2_PREV_INPUT
foreach prevhash O (idx2):
Request prevhash O STAGE_REQUEST_2_PREV_OUTPUT
Add amount of prevhash O (which is amount of I)
Request prevhash extra data (if applicable) STAGE_REQUEST_2_PREV_EXTRADATA
Calculate hash of streamed tx, compare to prevhash I
foreach O (idx1):
Request O STAGE_REQUEST_3_OUTPUT
Add O to Decred decred_hash_prefix
Add O to TransactionChecksum
if (Decred)
Return O
Display output
Ask for confirmation
Check tx fee
Ask for confirmation
@ -157,17 +167,21 @@ if (Decred)
foreach I (idx1): // input to sign
if (idx1 is segwit)
Request I STAGE_REQUEST_SEGWIT_INPUT Return serialized input chunk
Request I STAGE_REQUEST_SEGWIT_INPUT
Return serialized input chunk
else
foreach I (idx2):
Request I STAGE_REQUEST_4_INPUT If idx1 == idx2 Fill scriptsig
Request I STAGE_REQUEST_4_INPUT
If idx1 == idx2
Fill scriptsig
Remember key for signing
Add I to StreamTransactionSign
Add I to TransactionChecksum
foreach O (idx2):
Request O STAGE_REQUEST_4_OUTPUT Add O to StreamTransactionSign Add
O to TransactionChecksum
Request O STAGE_REQUEST_4_OUTPUT
Add O to StreamTransactionSign
Add O to TransactionChecksum
Compare TransactionChecksum with checksum computed in Phase 1
If different:
@ -176,24 +190,32 @@ O to TransactionChecksum
Return signed chunk
foreach O (idx1):
Request O STAGE_REQUEST_5_OUTPUT Rewrite change address Return O
Request O STAGE_REQUEST_5_OUTPUT
Rewrite change address
Return O
Phase3: sign segwit inputs, check that nothing changed
===============================================
foreach I (idx1): // input to sign
Request I STAGE_REQUEST_SEGWIT_WITNESS Check amount Sign segwit prevhash,
sequence, amount, outputs Return witness
Request I STAGE_REQUEST_SEGWIT_WITNESS
Check amount
Sign segwit prevhash, sequence, amount, outputs
Return witness
Phase3: sign Decred inputs
==========================
foreach I (idx1): // input to sign STAGE_REQUEST_DECRED_WITNESS Request I Fill
scriptSig Compute hash_witness
foreach I (idx1): // input to sign STAGE_REQUEST_DECRED_WITNESS
Request I
Fill scriptSig
Compute hash_witness
Sign (hash_type || decred_hash_prefix || hash_witness)
Return witness
clang-format on
*/
void send_req_1_input(void) {