mirror of
https://github.com/urbit/shrub.git
synced 2024-12-20 17:32:11 +03:00
405 lines
10 KiB
Plaintext
405 lines
10 KiB
Plaintext
/- sur=btc
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/+ base64
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^?
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=< [sur .]
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=, sur
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|%
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++ xpub-type
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|= =xpub
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^- bipt
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=/ prefix=tape (scag 4 (trip xpub))
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?: =("xpub" prefix) %bip44
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?: =("ypub" prefix) %bip49
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?: =("zpub" prefix) %bip84
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~|("invalid xpub: {<xpub>}" !!)
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:: +flip-byts: flip endianness while preserving lead/trail zeroes
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::
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++ flip-byts
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|= b=btc-byts
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%- to-byts:buffer
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%- flop
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%- from-byts:buffer b
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:: big endian sha256: input and output are both MSB first (big endian)
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::
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++ sha256
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|= =byts ^- hash256
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:: if there are leading 0s, lshift by their amount after flip to little endian to preserve
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=/ pad=@ (sub wid.byts (met 3 dat.byts))
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=/ little-endian=@
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(lsh 3 pad (swp 3 dat.byts))
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%- hash256
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:- 32
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%+ swp 3
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(shay wid.byts little-endian)
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::
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++ dsha256
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|= =byts
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(sha256 (sha256 byts))
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::
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++ hash-160
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|= pubkey=@ux ^- hash160
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=, ripemd:crypto
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%- hash160
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:- 20
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%- ripemd-160
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%- sha256 [(met 3 pubkey) pubkey]
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::
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++ to-script-pubkey
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|= script=^buffer ^- ^buffer
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%- zing
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:~ ~[0x19 0x76 0xa9 0x14]
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script
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~[0x88 0xac]
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==
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++ address-to-script-pubkey
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|= =address ^- ^buffer
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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 addresses supported" !!)
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(to-script-pubkey (from-byts:buffer hex))
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:: arms to handle BIP174 PSBTs
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::
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++ psbt
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|%
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:: +create: make base64 cord of PSBT
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::
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++ create
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|= [=rawtx =txid inputs=(list in:^psbt) outputs=(list out:^psbt)]
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^- cord
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:: TODO
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:: make global map
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:: turn each input and output into a map (or ~)
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:: put the 0x0 separator between all
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:: parse to hex
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:: encode as base64!
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*cord
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::
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++ hd-path
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|= [pubkey=btc-byts =target:^psbt =hdkey]
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^- keyval:^psbt
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=/ k=btc-byts
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%- to-byts:buffer
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?- target
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%input
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[0x6 (from-byts:buffer pubkey)]
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::
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%output
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[0x2 (from-byts:buffer pubkey)]
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==
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=/ bip ?- bipt.hdkey
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%bip84 0x54
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%bip49 0x31
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%bip44 0x2c
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==
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=/ hdpath=^buffer
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%+ weld
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:~ bip 0x0 0x0 0x80
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0x0 0x0 0x0 0x80
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0x0 0x0 0x0 0x80
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`@ux`chyg.hdkey 0x0 0x0 0x0
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==
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(from-atom-le:buffer (met 3 idx.hdkey) idx.hdkey)
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:- k
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%- concat-as-byts:buffer
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:~ (from-byts:buffer fprint.hdkey)
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hdpath
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==
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::
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++ parse
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|= psbt-base64=cord
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^- (list map:^psbt)
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=/ todo=^buffer
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%+ slag 5 (to-buffer psbt-base64)
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=| acc=(list map:^psbt)
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=| m=map:^psbt
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|-
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?~ todo (snoc acc m)
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:: 0x0: map separator
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?: =(0x0 i.todo)
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$(acc (snoc acc m), m *map:^psbt, todo t.todo)
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=+ [kv rest]=(next-keyval todo)
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$(m (snoc m kv), todo rest)
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:: +get-txid: extract txid from a valid PSBT
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::
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++ get-txid
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|= psbt-base64=cord
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^- txid
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=/ tx=btc-byts
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%- raw-tx
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%+ slag 5
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(to-buffer psbt-base64)
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=/ hash=btc-byts
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%- flip-byts
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%- sha256
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%- sha256
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tx
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?> ?=(%32 -.hash)
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hash
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:: +raw-tx: extract hex transaction
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:: looks for key 0x0 in global map
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:: crashes if tx not in buffer
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::
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++ raw-tx
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|= b=^buffer
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|- ^- btc-byts
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?~ b !!
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?: =(0x0 i.b) !!
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=+ nk=(next-keyval b)
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?: =(0x0 dat.key.kv.nk)
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val.kv.nk
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$(b rest.nk)
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:: +next-keyval: returns next key-val in a PSBT map
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:: input buffer head must be a map key length
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::
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++ next-keyval
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|= b=^buffer
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^- [kv=keyval:^psbt rest=^buffer]
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=+ klen=(snag 0 b)
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=+ k=(swag [1 klen] b)
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=+ vlen=(snag (add 1 klen) b)
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=+ v=(swag [(add 2 klen) vlen] b)
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=+ len=(add 2 (add klen vlen))
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?> ?=([^ ^] [k v])
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:_ (slag len b)
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:- (to-byts:buffer k)
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(to-byts:buffer v)
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::
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++ to-buffer
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|= psbt-base64=cord
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^- ^buffer
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~| "Invalid PSBT"
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=+ p=(de:base64 psbt-base64)
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?~ p !!
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=/ bigend=@ux (swp 3 q.u.p)
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(from-byts:buffer [(met 3 bigend) bigend])
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--
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:: buffer: byte buffer utilities
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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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::
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++ buffer
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|%
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++ from-byts
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|= =byts ^- ^buffer
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=/ b=(list @ux)
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(flop (rip 3 dat.byts))
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=/ pad=@ (sub wid.byts (lent b))
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(weld (reap pad 0x0) b)
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:: converts an atom to a little endian buffer with wid length (trailing 0s)
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:: atom 1 with wid=4 becomes ~[0x1 0x0 0x0 0x0]
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:: 0xff11 with wid=8 becomes ~[0x11 0xff 0x0 0x0 0x0 0x0 0x0 0x0]
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::
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++ from-atom-le
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|= [wid=@ a=@] ^- ^buffer
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=/ b=(list @ux) (rip 3 a)
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=/ pad=@ (sub wid (lent b))
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(weld b (reap pad 0x0))
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::
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++ to-byts
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|= b=^buffer ^- byts
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[(lent b) (rep 3 (flop b))]
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::
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++ concat-as-byts
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|= bs=(list ^buffer) ^- byts
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%- to-byts (zing bs)
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--
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:: Converts a list of bits to a list of n-bit numbers
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:: input-bits should be big-endian
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::
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++ bits
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|%
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:: rip atom a with num-bits. Preserve leading 0s, big endian
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:: returns a list of bits
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::
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++ zeros-brip
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|= [num-bits=@ a=@]
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^- (list @)
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=/ bits=(list @) (flop (rip 0 a))
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=/ pad=@ (sub num-bits (lent bits))
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(weld (reap pad 0) bits)
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:: converts from bit list to a list of atoms each with bitwidth d(est)
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::
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++ convert
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|= [d=@ bits=(list @)]
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^- (list @)
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=| ret=(list @)
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|- ?~ bits ret
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=/ dest-bits (scag d ((list @) bits))
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:: left-shift the "missing" number of bits
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=/ num=@
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%: lsh 0
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(sub d (lent dest-bits))
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(rep 0 (flop dest-bits))
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==
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$(ret (snoc ret num), bits (slag d ((list @) bits)))
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:: Converts e.g. ~[0 0 31 31 31 31 0 0] in base32 (5 bitwidth)
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:: to ~[0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0]
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::
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++ from-digits
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|= [bitwidth=@ digits=(list @)]
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^- (list @)
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%- zing
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%+ turn digits
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|= d=@ (zeros-brip bitwidth d)
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:: converts 40 bits: ~[0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0]
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:: to 0x3fff.fc00 when cast to hex
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::
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++ to-atom
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|= bits=(list @)
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^- @
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%+ rep 0
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%- flop bits
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--
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::
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++ bech32
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|%
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++ prefixes
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^- (map network tape)
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(my [[%main "bc"] [%testnet "tb"] ~])
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++ charset "qpzry9x8gf2tvdw0s3jn54khce6mua7l"
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+$ raw-decoded [hrp=tape data=(list @) checksum=(list @)]
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:: below is a port of: https://github.com/bitcoinjs/bech32/blob/master/index.js
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::
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++ polymod
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|= values=(list @)
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|^ ^- @
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=/ gen=(list @ux)
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~[0x3b6a.57b2 0x2650.8e6d 0x1ea1.19fa 0x3d42.33dd 0x2a14.62b3]
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=/ chk=@ 1
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|- ?~ values chk
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=/ top (rsh 0 25 chk)
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=. chk
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(mix i.values (lsh 0 5 (dis chk 0x1ff.ffff)))
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$(values t.values, chk (update-chk chk top gen))
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::
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++ update-chk
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|= [chk=@ top=@ gen=(list @ux)]
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=/ is (gulf 0 4)
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|- ?~ is chk
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?: =(1 (dis 1 (rsh 0 i.is top)))
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$(is t.is, chk (mix chk (snag i.is gen)))
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$(is t.is)
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--
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::
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++ expand-hrp
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|= hrp=tape
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^- (list @)
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=/ front (turn hrp |=(p=@tD (rsh 0 5 p)))
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=/ back (turn hrp |=(p=@tD (dis 31 p)))
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(zing ~[front ~[0] back])
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::
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++ verify-checksum
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|= [hrp=tape data-and-checksum=(list @)]
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^- ?
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%+ |=([a=@ b=@] =(a b))
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1
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%- polymod
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(weld (expand-hrp hrp) data-and-checksum)
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::
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++ checksum
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|= [hrp=tape data=(list @)]
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^- (list @)
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:: xor 1 with the polymod
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=/ pmod=@
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%+ mix 1
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%- polymod
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(zing ~[(expand-hrp hrp) data (reap 6 0)])
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%+ turn (gulf 0 5)
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|=(i=@ (dis 31 (rsh 0 (mul 5 (sub 5 i)) pmod)))
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::
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++ charset-to-value
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|= c=@tD
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^- (unit @)
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(find ~[c] charset)
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++ value-to-charset
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|= value=@
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^- (unit @tD)
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?: (gth value 31) ~
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`(snag value charset)
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::
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++ is-valid
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|= [bech=tape last-1-pos=@] ^- ?
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?& ?|(=((cass bech) bech) =((cuss bech) bech)) :: to upper or to lower is same as bech
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(gte last-1-pos 1)
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(lte (add last-1-pos 7) (lent bech))
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(lte (lent bech) 90)
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(levy bech |=(c=@tD (gte c 33)))
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(levy bech |=(c=@tD (lte c 126)))
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==
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:: data should be 5bit words
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::
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++ encode-raw
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|= [hrp=tape data=(list @)]
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^- bech32-address
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=/ combined=(list @)
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(weld data (checksum hrp data))
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:- %bech32
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%- crip
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(zing ~[hrp "1" (tape (murn combined value-to-charset))])
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++ decode-raw
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|= b=bech32-address
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^- (unit raw-decoded)
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=/ bech (cass (trip +.b)) :: to lowercase
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=/ pos (flop (fand "1" bech))
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?~ pos ~
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=/ last-1=@ i.pos
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?. (is-valid bech last-1) :: check bech32 validity (not segwit validity or checksum)
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~
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=/ hrp (scag last-1 bech)
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=/ encoded-data-and-checksum=(list @)
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(slag +(last-1) bech)
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=/ data-and-checksum=(list @)
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%+ murn encoded-data-and-checksum
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charset-to-value
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?. =((lent encoded-data-and-checksum) (lent data-and-checksum)) :: ensure all were in CHARSET
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~
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?. (verify-checksum hrp data-and-checksum)
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~
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=/ checksum-pos (sub (lent data-and-checksum) 6)
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`[hrp (scag checksum-pos data-and-checksum) (slag checksum-pos data-and-checksum)]
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:: goes from a bech32 address to hex. Returns byts to preserve leading 0s
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::
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++ to-hex
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|= b=bech32-address ^- hash
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=/ d=(unit raw-decoded) (decode-raw b)
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?~ d ~|("Invalid bech32 address" !!)
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=/ bs=(list @)
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(from-digits:bits 5 (slag 1 data.u.d))
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=/ byt-len=@ (div (lent bs) 8)
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?. =(0 (mod (lent bs) 8))
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~|("Invalid bech32 address: not 8bit" !!)
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?. ?|(?=(%20 byt-len) ?=(%32 byt-len))
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~|("Invalid bech32 address: must be 20 (P2WPKH) or 32 (P2WSH) bytes" !!)
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%- hash
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[byt-len (to-atom:bits bs)]
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:: pubkey is the 33 byte ECC compressed public key
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::
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++ encode-pubkey
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|= [=network pubkey=@ux]
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^- (unit bech32-address)
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?. =(33 (met 3 pubkey))
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~|('pubkey must be a 33 byte ECC compressed public key' !!)
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=/ prefix (~(get by prefixes) network)
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?~ prefix ~
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:- ~
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%+ encode-raw u.prefix
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[0 (convert:bits 5 (zeros-brip:bits 160 dat:(hash-160 pubkey)))]
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++ encode-hash-160
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|= [=network h160=byts]
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^- (unit bech32-address)
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=/ prefix (~(get by prefixes) network)
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?~ prefix ~
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:- ~
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%+ encode-raw u.prefix
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[0 (convert:bits 5 (zeros-brip:bits 160 dat.h160))]
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--
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::
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--
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