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def des.e

bend-osdev-legacy-ciphers@0.1.0.0 · des.bend:231

import bend-osdev-legacy-ciphers@0.1.0.0/des.bend as Des
import Base
import bend-osdev-legacy-ciphers@0.1.0.0/legacy_ciphers.bend as L

231# group i of E(R): bits 4i .. 4i + 5 of R (bit 0 is bit 32), the top six bits
232# of R rotated left by n = 4i - 1 (mod 32)
233def des.e(+r: U32, +n: Nat) -> U32:
234  U32.and(63, U32.shrn(L.lc.rotl(r, n), 26n))

Uses (5)

Used by (1)