mirror of
https://github.com/urbit/shrub.git
synced 2024-12-27 06:02:27 +03:00
145 lines
4.0 KiB
Plaintext
145 lines
4.0 KiB
Plaintext
:: BIP173: Bech32 Addresses
|
|
:: https://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki
|
|
::
|
|
:: Heavily copies:
|
|
:: https://github.com/bitcoinjs/bech32/blob/master/index.js
|
|
::
|
|
/- sur=bitcoin
|
|
/+ bcu=bitcoin-utils
|
|
=, sur
|
|
=, bcu
|
|
|%
|
|
++ prefixes
|
|
^- (map network tape)
|
|
(my [[%main "bc"] [%testnet "tb"] [%regtest "bcrt"] ~])
|
|
++ charset "qpzry9x8gf2tvdw0s3jn54khce6mua7l"
|
|
+$ raw-decoded [hrp=tape data=(list @) checksum=(list @)]
|
|
:: below is a port of: https://github.com/bitcoinjs/bech32/blob/master/index.js
|
|
::
|
|
++ polymod
|
|
|= values=(list @)
|
|
|^ ^- @
|
|
=/ gen=(list @ux)
|
|
~[0x3b6a.57b2 0x2650.8e6d 0x1ea1.19fa 0x3d42.33dd 0x2a14.62b3]
|
|
=/ chk=@ 1
|
|
|- ?~ values chk
|
|
=/ top (rsh [0 25] chk)
|
|
=. chk
|
|
(mix i.values (lsh [0 5] (dis chk 0x1ff.ffff)))
|
|
$(values t.values, chk (update-chk chk top gen))
|
|
::
|
|
++ update-chk
|
|
|= [chk=@ top=@ gen=(list @ux)]
|
|
=/ is (gulf 0 4)
|
|
|- ?~ is chk
|
|
?: =(1 (dis 1 (rsh [0 i.is] top)))
|
|
$(is t.is, chk (mix chk (snag i.is gen)))
|
|
$(is t.is)
|
|
--
|
|
::
|
|
++ expand-hrp
|
|
|= hrp=tape
|
|
^- (list @)
|
|
=/ front (turn hrp |=(p=@tD (rsh [0 5] p)))
|
|
=/ back (turn hrp |=(p=@tD (dis 31 p)))
|
|
(zing ~[front ~[0] back])
|
|
::
|
|
++ verify-checksum
|
|
|= [hrp=tape data-and-checksum=(list @)]
|
|
^- ?
|
|
%- |=(a=@ =(1 a))
|
|
%- polymod
|
|
(weld (expand-hrp hrp) data-and-checksum)
|
|
::
|
|
++ checksum
|
|
|= [hrp=tape data=(list @)]
|
|
^- (list @)
|
|
:: xor 1 with the polymod
|
|
::
|
|
=/ pmod=@
|
|
%+ mix 1
|
|
%- polymod
|
|
(zing ~[(expand-hrp hrp) data (reap 6 0)])
|
|
%+ turn (gulf 0 5)
|
|
|=(i=@ (dis 31 (rsh [0 (mul 5 (sub 5 i))] pmod)))
|
|
::
|
|
++ charset-to-value
|
|
|= c=@tD
|
|
^- (unit @)
|
|
(find ~[c] charset)
|
|
++ value-to-charset
|
|
|= value=@
|
|
^- (unit @tD)
|
|
?: (gth value 31) ~
|
|
`(snag value charset)
|
|
::
|
|
++ is-valid
|
|
|= [bech=tape last-1-pos=@] ^- ?
|
|
?& ?|(=((cass bech) bech) =((cuss bech) bech)) :: to upper or to lower is same as bech
|
|
(gte last-1-pos 1)
|
|
(lte (add last-1-pos 7) (lent bech))
|
|
(lte (lent bech) 90)
|
|
(levy bech |=(c=@tD (gte c 33)))
|
|
(levy bech |=(c=@tD (lte c 126)))
|
|
==
|
|
:: data should be 5bit words
|
|
::
|
|
++ encode-raw
|
|
|= [hrp=tape data=(list @)]
|
|
^- cord
|
|
=/ combined=(list @)
|
|
(weld data (checksum hrp data))
|
|
%- crip
|
|
(zing ~[hrp "1" (tape (murn combined value-to-charset))])
|
|
++ decode-raw
|
|
|= body=cord
|
|
^- (unit raw-decoded)
|
|
=/ bech (cass (trip body)) :: to lowercase
|
|
=/ pos (flop (fand "1" bech))
|
|
?~ pos ~
|
|
=/ last-1=@ i.pos
|
|
?. (is-valid bech last-1) :: check bech32 validity (not segwit validity or checksum)
|
|
~
|
|
=/ hrp (scag last-1 bech)
|
|
=/ encoded-data-and-checksum=(list @)
|
|
(slag +(last-1) bech)
|
|
=/ data-and-checksum=(list @)
|
|
%+ murn encoded-data-and-checksum
|
|
charset-to-value
|
|
?. =((lent encoded-data-and-checksum) (lent data-and-checksum)) :: ensure all were in CHARSET
|
|
~
|
|
?. (verify-checksum hrp data-and-checksum)
|
|
~
|
|
=/ checksum-pos (sub (lent data-and-checksum) 6)
|
|
`[hrp (scag checksum-pos data-and-checksum) (slag checksum-pos data-and-checksum)]
|
|
:: +from-address: BIP173 bech32 address encoding to hex
|
|
:: https://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki
|
|
:: expects to drop a leading 5-bit 0 (the witness version)
|
|
::
|
|
++ from-address
|
|
|= body=cord
|
|
^- hexb
|
|
~| "Invalid bech32 address"
|
|
=/ d=(unit raw-decoded) (decode-raw body)
|
|
?> ?=(^ d)
|
|
=/ bs=bits (from-atoms:bit 5 data.u.d)
|
|
=/ byt-len=@ (div (sub wid.bs 5) 8)
|
|
?> =(5^0b0 (take:bit 5 bs))
|
|
?> ?| =(20 byt-len)
|
|
=(32 byt-len)
|
|
==
|
|
[byt-len `@ux`dat:(take:bit (mul 8 byt-len) (drop:bit 5 bs))]
|
|
:: pubkey is the 33 byte ECC compressed public key
|
|
::
|
|
++ encode-pubkey
|
|
|= [=network pubkey=byts]
|
|
^- (unit cord)
|
|
?. =(33 wid.pubkey)
|
|
~|('pubkey must be a 33 byte ECC compressed public key' !!)
|
|
=/ prefix (~(get by prefixes) network)
|
|
?~ prefix ~
|
|
:- ~
|
|
%+ encode-raw u.prefix
|
|
[0v0 (to-atoms:bit 5 [160 `@ub`dat:(hash-160 pubkey)])]
|
|
--
|