mirror of
https://github.com/urbit/shrub.git
synced 2024-12-24 03:14:30 +03:00
333 lines
9.1 KiB
Plaintext
333 lines
9.1 KiB
Plaintext
/- *btc
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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 ^- hash
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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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:- 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 ^- hash
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=, ripemd:crypto
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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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?. ?=(%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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?. =(wid.hex 20)
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~|("Only 20-byte P2WPKH bech32 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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::
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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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++ 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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::
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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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::
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++ outputs-buffer
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|= =output:tx ^- ^buffer
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%+ weld
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(from-atom-le 8 value.output)
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(address-to-script-pubkey address.output)
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::
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++ sighash
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|= input-index=@ ^- hash
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?: (gte input-index (lent inputs.ut))
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~|("Input index out of range" !!)
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=/ =input:tx (snag input-index inputs.ut)
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?: =(1 witness-ver.input)
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(sighash-witness input)
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(sighash-legacy input)
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::
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++ sighash-witness
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|= =input:tx ^- 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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%- concat-as-byts
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(turn inputs.ut sequence-buffer)
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=/ outputs=byts
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%- concat-as-byts (turn outputs.ut outputs-buffer)
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:: Hash inputs in order, as per BIP143 examples
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::
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=/ n-version=^buffer (from-atom-le 4 version.ut)
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=/ hash-prevouts=^buffer
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%- from-byts (dsha256 prevouts)
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=/ hash-sequence=^buffer
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%- from-byts (dsha256 sequences)
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=/ outpoint=^buffer
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%+ weld (from-byts tx-hash.input)
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(from-atom-le 4 witness-ver.input)
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=/ script-code=^buffer
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%- to-script-pubkey
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(slag 2 (from-byts script-pubkey.input))
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=/ amount=^buffer
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(from-atom-le 8 value.input)
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=/ n-sequence=^buffer (sequence-buffer input)
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=/ hash-outputs=^buffer
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%- from-byts (dsha256 outputs)
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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)
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%- dsha256
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%- concat-as-byts
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:~ n-version
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hash-prevouts
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hash-sequence
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outpoint
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script-code
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amount
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n-sequence
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hash-outputs
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n-locktime
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n-hashtype
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==
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::
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++ sighash-legacy
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|= =input:tx ^- hash
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[0 0x0]
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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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:: 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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::
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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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?. =(0 (mod (lent bs) 8))
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~|("Invalid bech32 address: not 8bit" !!)
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[(div (lent bs) 8) (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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