Blake2b.rotr_split: def of bend-collections-laws-crypto@1.0.0.0
Import: import bend-collections-laws-crypto@1.0.0.0/spec/crypto/blake/blake2b.bend as Blake2b
Lines 36-40 of bend-collections-laws-crypto@1.0.0.0/spec/crypto/blake/blake2b.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/crypto/blake/blake2b.bend&start_line=36&end_line=40

import Base
import bend-collections-laws-crypto@1.0.0.0/src/crypto/blake/blake2b/types.bend as T

# n > 32 rotates the swapped halves by n - 32.
def rotr_split(lo: U32, hi: U32, +n: Nat, small: Bool) -> T.Lane:
  match small:
    case True{}: rotr_small(lo,hi,n)
    case False{}: rotr_small(hi,lo,Nat.sub(n,32n))

Uses (6):
  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
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/crypto/blake/blake2b.bend&name=rotr_small
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/src/crypto/blake/blake2b/types.bend&name=Lane