mirror of
https://github.com/ilyakooo0/urbit.git
synced 2024-12-18 20:31:40 +03:00
178 lines
3.6 KiB
Plaintext
178 lines
3.6 KiB
Plaintext
:: lib/bitcoin-utils.hoon
|
|
:: Utilities for working with BTC data types and transactions
|
|
::
|
|
/- *bitcoin
|
|
~% %bitcoin-utils-lib ..part ~
|
|
|%
|
|
::
|
|
:: TODO: move this bit/byt stuff to zuse
|
|
:: bit/byte utilities
|
|
::
|
|
::
|
|
:: +blop: munge bit and byt sequences (cat, flip, take, drop)
|
|
::
|
|
++ blop
|
|
~/ %blop
|
|
|_ =bloq
|
|
+$ biyts [wid=@ud dat=@]
|
|
++ cat
|
|
|= bs=(list biyts)
|
|
^- biyts
|
|
:- (roll (turn bs |=(b=biyts -.b)) add)
|
|
(can bloq (flop bs))
|
|
:: +flip: flip endianness while preserving lead/trail zeroes
|
|
::
|
|
++ flip
|
|
|= b=biyts
|
|
^- biyts
|
|
[wid.b (rev bloq b)]
|
|
:: +take: take n bloqs from front
|
|
:: pads front with extra zeroes if n is longer than input
|
|
::
|
|
++ take
|
|
|= [n=@ b=biyts]
|
|
^- biyts
|
|
?: (gth n wid.b)
|
|
[n dat.b]
|
|
[n (rsh [bloq (sub wid.b n)] dat.b)]
|
|
:: +drop: drop n bloqs from front
|
|
:: returns 0^0 if n >= width
|
|
::
|
|
++ drop
|
|
|= [n=@ b=biyts]
|
|
^- biyts
|
|
?: (gte n wid.b)
|
|
0^0x0
|
|
=+ n-take=(sub wid.b n)
|
|
[n-take (end [bloq n-take] dat.b)]
|
|
--
|
|
++ byt ~(. blop 3)
|
|
::
|
|
++ bit
|
|
~/ %bit
|
|
=/ bl ~(. blop 0)
|
|
|%
|
|
++ cat cat:bl:bit
|
|
++ flip flip:bl:bit
|
|
++ take take:bl:bit
|
|
++ drop drop:bl:bit
|
|
++ from-atoms
|
|
|= [bitwidth=@ digits=(list @)]
|
|
^- bits
|
|
%- cat:bit
|
|
%+ turn digits
|
|
|= a=@
|
|
?> (lte (met 0 a) bitwidth)
|
|
[bitwidth `@ub`a]
|
|
:: +to-atoms: convert bits to atoms of bitwidth
|
|
::
|
|
++ to-atoms
|
|
|= [bitwidth=@ bs=bits]
|
|
^- (list @)
|
|
=| res=(list @)
|
|
?> =(0 (mod wid.bs bitwidth))
|
|
|-
|
|
?: =(0 wid.bs) res
|
|
%= $
|
|
res (snoc res dat:(take:bit bitwidth bs))
|
|
bs (drop:bit bitwidth bs)
|
|
==
|
|
--
|
|
:: big endian sha256: input and output are both MSB first (big endian)
|
|
::
|
|
++ sha256
|
|
~/ %sha256
|
|
|= =byts
|
|
^- hexb
|
|
%- flip:byt
|
|
[32 (shay (flip:byt byts))]
|
|
::
|
|
++ dsha256
|
|
~/ %dsha256
|
|
|= =byts
|
|
(sha256 (sha256 byts))
|
|
::
|
|
++ hash-160
|
|
~/ %hash-160
|
|
|= val=byts
|
|
^- hexb
|
|
=, ripemd:crypto
|
|
:- 20
|
|
%- ripemd-160
|
|
(sha256 val)
|
|
|
|
::
|
|
:: hxb: hex parsing utilities
|
|
::
|
|
++ hxb
|
|
~% %hxb ..blop ~
|
|
|%
|
|
++ from-cord
|
|
~/ %from-cord
|
|
|= h=@t
|
|
^- hexb
|
|
?: =('' h) 1^0x0
|
|
:: Add leading 00
|
|
::
|
|
=+ (lsh [3 2] h)
|
|
:: Group by 4-size block
|
|
::
|
|
=+ (rsh [3 2] -)
|
|
:: Parse hex to atom
|
|
::
|
|
=/ a (need (de:base16:mimes:html -))
|
|
[-.a `@ux`+.a]
|
|
::
|
|
++ to-cord
|
|
~/ %to-cord
|
|
|= =hexb
|
|
^- cord
|
|
(en:base16:mimes:html hexb)
|
|
--
|
|
::
|
|
:: +csiz: CompactSize integers (a Bitcoin-specific datatype)
|
|
:: https://btcinformation.org/en/developer-reference#compactsize-unsigned-integers
|
|
:: - encode: big endian to little endian
|
|
:: - decode: little endian to big endian
|
|
::
|
|
++ csiz
|
|
~% %csiz ..blop ~
|
|
|%
|
|
++ en
|
|
~/ %en
|
|
|= a=@
|
|
^- hexb
|
|
=/ l=@ (met 3 a)
|
|
?: =(l 0) 1^a
|
|
?: =(l 1) 1^a
|
|
?: =(l 2) (cat:byt ~[1^0xfd (flip:byt 2^a)])
|
|
?: (lte l 4) (cat:byt ~[1^0xfe (flip:byt 4^a)])
|
|
?: (lte l 8) (cat:byt ~[1^0xff (flip:byt 8^a)])
|
|
~|("Cannot encode CompactSize longer than 8 bytes" !!)
|
|
::
|
|
++ de
|
|
~/ %de
|
|
|= h=hexb
|
|
^- [n=hexb rest=hexb]
|
|
=/ s=@ux dat:(take:byt 1 h)
|
|
?: (lth s 0xfd) [1^s (drop:byt 1 h)]
|
|
~| "Invalid compact-size at start of {<h>}"
|
|
=/ len=bloq
|
|
?+ s !!
|
|
%0xfd 1
|
|
%0xfe 2
|
|
%0xff 3
|
|
==
|
|
:_ (drop:byt (add 1 (bex len)) h)
|
|
%- flip:byt
|
|
(take:byt (bex len) (drop:byt 1 h))
|
|
:: +dea: atom instead of hexb for parsed CompactSize
|
|
::
|
|
++ dea
|
|
|= h=hexb
|
|
^- [a=@ rest=hexb]
|
|
=> (de h)
|
|
[dat.n rest]
|
|
--
|
|
--
|