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WIP: can partially sign txs
This commit is contained in:
timlucmiptev
ixv
parent
433d7d57c1
commit
39605a1087
@ -200,6 +200,7 @@ Native P2WPKH
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```
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### Signing the above
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Signing input index 1 (witness)
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```
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=ecc secp256k1:secp:crypto
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=h dat:(~(sighash unsigned-tx:btc utx) 1)
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@ -210,32 +211,36 @@ Native P2WPKH
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:: compress-point gives 0x2.5476.c2e8.3188.368d.a1ff.3e29.2e7a.cafc.db35.66bb.0ad2.53f6.2fc7.0f07.aeee.6357
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:: pubkey gives
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:: desired r of sig:
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:: 3609e17b84f6a7d30c80bfa610b5b4542f32a8a0d5447a12fb1366d7f01cc44a
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:: 0x3609.e17b.84f6.a7d3.0c80.bfa6.10b5.b454.2f32.a8a0.d544.7a12.fb13.66d7.f01c.c44a
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::
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:: desired s of sig:
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:: 573a954c4518331561406f90300e8f3358f51928d43c212a8caed02de67eebee
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```
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619c.3350.25c7.f401.2e55.6c2a.58b2.506e.30b8.511b.53ad.e95e.a316.fd8c.3286.feb9
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## cutting off the last 20 bytes (for bech32 address outputs):
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Signing input index 0 (non-witness)
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```
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`@ux`(end 3 2 0x14.6655)
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:: gives 0x6655
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=h2 dat:(~(sighash unsigned-tx:btc utx) 0)
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=privkey2 0xbbc2.7228.ddcb.9209.d7fd.6f36.b02f.7dfa.6252.af40.bb2f.1cbc.7a55.7da8.027f.f866
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`[@ r=@ux s=@ux]`(ecdsa-raw-sign:ecc (@uvI h2) privkey2)
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:: desired r;
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:: 0x8b9d.1dc2.6ba6.a9cb.6212.7b02.742f.a9d7.54cd.3beb.f337.f7a5.5d11.4c8e.5cdd.30be
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```
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### A sample legacy address-only transaction
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```
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=linput0 (input:tx:btcs [[32 0xeccf.7e30.3418.9b85.1985.d871.f913.84b8.ee35.7cd4.7c30.2473.6e56.76eb.2deb.b3f2] 1 0 [4 0xffff.ffff] [25 0x76.a914.0109.6677.6006.953d.5567.439e.5e39.f86a.0d27.3bee.88ac] ~ ~ 100.000.000])
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=loutput0 (output:tx:btcs [[%legacy 0c1runeksijzfVxyrpiyCY2LCBvYsSiFsCm] 99.900.000])
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=lutx (unsigned:tx:btcs [1 0x0 ~[linput0] ~[loutput0]])
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=lh dat:(~(sighash unsigned-tx:btc lutx) 0)
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=lprivkey 0x18e1.4a7b.6a30.7f42.6a94.f811.4701.e7c8.e774.e7f9.a47e.2c20.35db.29a2.0632.1725
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`[@ r=@ux s=@ux]`(ecdsa-raw-sign:ecc (@uvI lh) lprivkey)
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```
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0x970.7252.4438.d003.d23a.2f23.edb6.5aae.1bb3.e469
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### BIP143 Reference
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https://github.com/bitcoin/bips/blob/master/bip-0143.mediawiki#P2SHP2WPKH
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## more scratch
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7f5a997b83f51f793b8910be99508b00a136f922
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0x7f5a.997b.83f5.1f79.3b89.10be.9950.8b00.a136.f922
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db6b1b20aa0fd7b23880be2ecbd4a98130974cf4748fb66092ac4d3ceb1a547701000000
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0x46.c323.0000.0000
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bip143 hash preimage:
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0x100.0000.96b8.27c8.483d.4e9b.9671.2b67.13a7.b68d.6e80.03a7.81fe.ba36.c311.4347.0b4e.fd37.52b0.a642.eea2.fb7a.e638.c36f.6252.b675.0293.dbe5.74a8.0698.4b8e.4d85.4833.9a3b.ef51.e1b8.04cc.89d1.82d2.7965.5c3a.a89e.815b.1b30.9fe2.87d9.b2b5.5d57.b90e.c68a.0100.0000.1976.a914.1d0f.172a.0ecb.48ae.e1be.1f26.87d2.963a.e33f.71a1.88ac.0046.c323.0000.0000.ffff.ffff.863e.f3e1.a92a.fbfd.b97f.31ad.0fc7.683e.e943.e9ab.cf25.0159.0ff8.f655.1f47.e5e5.1100.0000.0100.0000
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86
lib/btc.hoon
86
lib/btc.hoon
@ -32,11 +32,16 @@
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==
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++ address-to-script-pubkey
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|= =address ^- ^buffer
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?. ?=(%bech32 -.address)
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~|("Only bech32 addresses supported right now" !!)
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=/ hex=byts (to-hex:bech32 address)
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=/ hex=byts
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?- -.address
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%bech32
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(to-hex:bech32 address)
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%legacy
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=/ h=@ux (@ux +.address)
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[(met 3 h) h]
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==
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?. =(wid.hex 20)
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~|("Only 20-byte P2WPKH bech32 supported" !!)
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~|("Only 20-byte addresses supported" !!)
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(to-script-pubkey (from-byts:buffer hex))
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:: list of @ux that is big endian for hashing purposes
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:: used to preserve 0s when concatenating byte sequences
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@ -67,15 +72,14 @@
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%- to-byts (zing bs)
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--
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::
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:: TODO: current status
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:: - creates sighash for witness correctly
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:: - creates sighash for 1-input legacy correctly
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:: - don't know yet whether the sighash for multiple-input legacy is correct -- test w JS
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::
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++ unsigned-tx
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=, buffer
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|_ ut=unsigned:tx
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++ prevouts-buffer
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|= =input:tx ^- ^buffer
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%+ weld
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(from-byts tx-hash.input)
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(from-atom-le 4 witness-ver.input)
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::
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++ sequence-buffer
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|= =input:tx ^- ^buffer
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(from-byts sequence.input)
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@ -96,7 +100,8 @@
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(sighash-legacy input-index)
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::
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++ sighash-witness
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|= =input:tx ^- hash
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|= =input:tx
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|^ ^- hash
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=/ prevouts=byts
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%- concat-as-byts (turn inputs.ut prevouts-buffer)
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=/ sequences=byts
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@ -136,13 +141,62 @@
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n-locktime
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n-hashtype
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==
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::
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++ prevouts-buffer
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|= =input:tx ^- ^buffer
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%+ weld
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(from-byts tx-hash.input)
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(from-atom-le 4 witness-ver.input)
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--
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::
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++ sighash-legacy
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|= input-index=@ ^- hash
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:: TODO: turn each input
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:: make the script be 0x0
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:: at the end, use snap to replace ONLY the one at input-index with the real script
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[0 0x0]
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:: TODO: Not working--wrong sighash for multiple inputs (works for 1)
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|= index-to-sign=@
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|^ ^- hash
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=/ n-version=^buffer (from-atom-le 4 version.ut)
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=/ num-inputs=^buffer ~[(@ux (lent inputs.ut))]
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=/ prevouts=^buffer
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%- zing
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(turn inputs-with-index (cury prevouts-buffer index-to-sign))
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=/ num-outputs=^buffer ~[(@ux (lent outputs.ut))]
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=/ outputs=^buffer
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%- zing (turn outputs.ut outputs-buffer)
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=/ n-locktime=^buffer (from-atom-le 4 locktime.ut)
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=/ n-hashtype=^buffer (from-atom-le 4 1) :: we only support SIGHASH_ALL
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=/ struct=(list ^buffer)
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:~ v=n-version
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ni=num-inputs
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prev=prevouts
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no=num-outputs
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os=outputs
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lock=n-locktime
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hash-type=n-hashtype
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==
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:: ~& >>> struct
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(dsha256 (concat-as-byts struct))
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::
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++ inputs-with-index
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^- (list [@ input:tx])
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%+ turn (gulf 0 (dec (lent inputs.ut)))
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|= i=@ [i (snag i inputs.ut)]
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++ prevouts-buffer
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|= [index-to-sign=@ index=@ =input:tx]
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^- ^buffer
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%- zing
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:~ (from-byts tx-hash.input)
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(from-atom-le 4 tx-index.input)
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:: only insert script-pubkey if we're on the input index being signed
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?: =(index-to-sign index)
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(format-script-pubkey (from-byts script-pubkey.input))
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~[0x0]
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(from-byts sequence.input)
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==
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++ format-script-pubkey
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|= spk=^buffer ^- ^buffer
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?: =((^buffer ~[0x76 0xa9]) (scag 2 spk))
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[0x19 spk]
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spk
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--
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--
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::
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:: Converts a list of bits to a list of n-bit numbers
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@ -37,5 +37,3 @@
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++ op-checksig 172
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--
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--
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