Sha512.zero_count_if: def of bend-collections-laws-crypto@1.0.0.0
Import: import bend-collections-laws-crypto@1.0.0.0/spec/crypto/sha512.bend as Sha512
Lines 156-163 of bend-collections-laws-crypto@1.0.0.0/spec/crypto/sha512.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/crypto/sha512.bend&start_line=156&end_line=163

import Base

# The k zero bytes with n + 1 + k = 112 (mod 128): a remainder of 0..111 leaves
# room for the length in this block, one of 112..127 needs another block.
def zero_count_if(r: Nat, fits: Bool) -> Nat:
  match fits:
    case True{}:
      Nat.sub(111n, r)
    case False{}:
      Nat.sub(239n, r)

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.sub