Pdec.dur: def of bend-collections-laws-crypto@1.0.0.0
Import: import bend-collections-laws-crypto@1.0.0.0/proofs/crypto/secp256k1/pdec.bend as Pdec
Lines 78-87 of bend-collections-laws-crypto@1.0.0.0/proofs/crypto/secp256k1/pdec.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-crypto@1.0.0.0/proofs/crypto/secp256k1/pdec.bend&start_line=78&end_line=87

import Base
import bend-collections-laws-crypto@1.0.0.0/proofs/crypto/secp256k1/sel.bend as SL
import bend-collections-laws-crypto@1.0.0.0/spec/crypto/secp256k1/field.bend as FS
import bend-collections-laws-crypto@1.0.0.0/src/crypto/secp256k1/point.bend as P
import bend-collections-laws-crypto@1.0.0.0/proofs/crypto/secp256k1/penc.bend as PE

def dur(+one: Nat, +h1: {one == 1n : Nat}, +x: List<&2, Nat>, +y: List<&2, Nat>, +hlx: {FS.limbs16(one, 16n, x) == True{} : Bool}, +hly: {FS.limbs16(one, 16n, y) == True{} : Bool}, a: Bool, bx: Bool, by: Bool, +hbx: {Nat.is_lt(FS.value(one, x), FS.prime(one)) == bx : Bool}, +hby: {Nat.is_lt(FS.value(one, y), FS.prime(one)) == by : Bool}) -> {PE.mpred(one, P.decode_u(x, y, Bool.and(Bool.and(a, Bool.and(bx, by)), P.on_curve(x, y)))) == True{} : Bool}:
  match a bx by:
    case True{} True{} True{}:
      dur_ok(one, h1, x, y, SL.red_of(one, x, hlx, hbx), SL.red_of(one, y, hly, hby), P.on_curve(x, y))
    case True{} True{} False{}:
      {==}
    case True{} False{} _:
      {==}
    case False{} _ _:
      {==}

Uses (13):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.is_lt
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/proofs/crypto/secp256k1/pdec.bend&name=dur_ok
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/proofs/crypto/secp256k1/penc.bend&name=mpred
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/proofs/crypto/secp256k1/sel.bend&name=red_of
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/crypto/secp256k1/field.bend&name=limbs16
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/crypto/secp256k1/field.bend&name=prime
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/crypto/secp256k1/field.bend&name=value
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/src/crypto/secp256k1/point.bend&name=decode_u
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/src/crypto/secp256k1/point.bend&name=on_curve