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67 lines
1.8 KiB
Plaintext
67 lines
1.8 KiB
Plaintext
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+$ address ?([@uc [%bech32 @t]])
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+$ decoded-bech32 [hrp=tape data=(list @) checksum=(list @)]
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++ charset "qpzry9x8gf2tvdw0s3jn54khce6mua7l"
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++ polymod
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|= values=(list @)
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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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++ 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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%- polymod
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(weld (expand-hrp hrp) data-and-checksum)
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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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::
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++ decode-bech32
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|= bech=tape
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^- (unit decoded-bech32)
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:: TODO: error handling and checksum verify
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=. bech (cass bech) :: 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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=/ 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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=/ hrp (scag last-1 bech)
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?. =(1 (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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::
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++ decode-segwit
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|= segwit=tape
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^- (unit [witver=@ witprog=@ux])
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~
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--
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