Sha512.recurrence: 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 205-208 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=205&end_line=208

import Base
import bend-collections-laws-crypto@1.0.0.0/src/crypto/sha512/types.bend as T

# W[t] = sigma1(W[t-2]) + W[t-7] + sigma0(W[t-15]) + W[t-16]
def recurrence(+history: List<&2, T.Lane>) -> T.Lane:
  add(add(add(sigma1(previous(history, 2n)), previous(history, 7n)),
    sigma0(previous(history, 15n))), previous(history, 16n))

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/crypto/sha512.bend&name=add
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/crypto/sha512.bend&name=previous
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/crypto/sha512.bend&name=sigma0
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/crypto/sha512.bend&name=sigma1
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/src/crypto/sha512/types.bend&name=Lane