X25519.bits: def of bend-collections-laws-crypto@1.0.0.0
Import: import bend-collections-laws-crypto@1.0.0.0/spec/crypto/curve25519/x25519.bend as X25519
Lines 134-136 of bend-collections-laws-crypto@1.0.0.0/spec/crypto/curve25519/x25519.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/crypto/curve25519/x25519.bend&start_line=134&end_line=136

import Base
import bend-collections-laws-crypto@1.0.0.0/spec/lib/common.bend as C

# RFC 7748's `bits` (255 for X25519) as 8 * len(k) - 1 of the 32-byte scalar
def bits(k: List<&2, U32>) -> Nat:
  Nat.sub(Nat.mul(8n, C.length(U32, k)), 1n)

Uses (6):
  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.mul
  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/lib/common.bend&name=length