PROOF.kb_fb_len: def of bend-osdev-crypto@0.1.0.0
Import: import bend-osdev-crypto@0.1.0.0/PROOF.bend as PROOF
Lines 673-684 of bend-osdev-crypto@0.1.0.0/PROOF.bend: https://jend.leeeet.dev/read.txt?path=bend-osdev-crypto@0.1.0.0/PROOF.bend&start_line=673&end_line=684

import Base
import bend-osdev-bytes@0.1.0.0/bytes.bend as B
import bend-osdev-crypto@0.1.0.0/kbkdf.bend as Kb

def kb_fb_len(~K: Data, ~compute: K -> B.Octets -> B.Octets, n: Nat, cur: List<&2, U32>, +k: K, +rlen: Nat, +fixed: B.Octets, +prev: B.Octets, +i: U32) -> {B.len(Kb.cr.kb.fb(~K, ~compute, n, cur, k, rlen, fixed, prev, i)) == n : Nat}:
  match n:
    case 0n:
      {==}
    case 1n+p:
      match cur:
        case Con{h, t}:
          %kb_fb_len(~K, ~compute, p, t, k, rlen, fixed, prev, i) : {B.len(Kb.cr.kb.fb(~K, ~compute, 1n+p, Con{h, t}, k, rlen, fixed, prev, i)) == 1n+_ : Nat}
          {==}
        case Nil{}:
          %kb_fb_len(~K, ~compute, p, Kb.cr.kb.tail(B.Octets.to_list(compute(k, B.Octets.append(prev, B.Octets.append(Kb.CrKbkdf.counter(rlen, U32.add(i, 1)), fixed))))), k, rlen, fixed, compute(k, B.Octets.append(prev, B.Octets.append(Kb.CrKbkdf.counter(rlen, U32.add(i, 1)), fixed))), U32.add(i, 1)) : {B.len(Kb.cr.kb.fb(~K, ~compute, 1n+p, Nil{}, k, rlen, fixed, prev, i)) == 1n+_ : Nat}
          {==}

Uses (11):
  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=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.add
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/bytes.bend&name=Octets
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/bytes.bend&name=Octets.append
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/bytes.bend&name=Octets.to_list
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/bytes.bend&name=len
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-crypto@0.1.0.0/kbkdf.bend&name=CrKbkdf.counter
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-crypto@0.1.0.0/kbkdf.bend&name=cr.kb.fb
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-crypto@0.1.0.0/kbkdf.bend&name=cr.kb.tail