Serpent.sp.round_keys: def of bend-osdev-legacy-ciphers@0.1.0.0
Import: import bend-osdev-legacy-ciphers@0.1.0.0/serpent.bend as Serpent
Lines 326-337 of bend-osdev-legacy-ciphers@0.1.0.0/serpent.bend: https://jend.leeeet.dev/read.txt?path=bend-osdev-legacy-ciphers@0.1.0.0/serpent.bend&start_line=326&end_line=337

import Base
import bend-osdev-cipher-modes@0.1.0.0/cipher_modes.bend as M

# round key K_i = S_((3 - i) mod 8)(w_(4i) .. w_(4i+3)), as an XOR step, for
# n more round keys from i
def sp.round_keys(n: Nat, +i: Nat, ws: List<&2, U32>) -> List<&2, M.CmBlock>:
  match n:
    case 0n:
      Nil{}
    case 1n+p:
      match ws:
        case Con{a, Con{b, Con{c, Con{d, t}}}}:
          Con{sp.sop(sp.box(Nat.sub(35n, i)), False{}, M.CmBlock{a, b, c, d}), sp.round_keys(p, Nat.add(i, 1n), t)}
        case _:
          Nil{}

Uses (9):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  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.add
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.sub
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-cipher-modes@0.1.0.0/cipher_modes.bend&name=CmBlock
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-legacy-ciphers@0.1.0.0/serpent.bend&name=sp.box
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-legacy-ciphers@0.1.0.0/serpent.bend&name=sp.sop