Serpent.sp.lt3: 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 177-181 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=177&end_line=181

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

# X1 = X1 xor X0 xor X2 (its own inverse)
def sp.lt3(s: M.CmBlock) -> M.CmBlock:
  match s:
    case M.CmBlock{+x0, x1, +x2, x3}:
      M.CmBlock{x0, U32.xor(x1, U32.xor(x0, x2)), x2, x3}

Uses (2):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.xor
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-cipher-modes@0.1.0.0/cipher_modes.bend&name=CmBlock