def byte_rt
bend-collections-laws-crypto@1.0.0.0 · proofs/crypto/curve25519/xbits.bend:207
import bend-collections-laws-crypto@1.0.0.0/proofs/crypto/curve25519/xbits.bend as Xbits
import Base
import bend-collections-laws-crypto@1.0.0.0/proofs/lib/nat.bend as N
import bend-collections-laws-crypto@1.0.0.0/proofs/lib/u32.bend as U
207def byte_rt(+y: U32, +hy: {Nat.is_le(v(y), 255n) == True{} : Bool}) -> {U32.from_nat(v(y)) == y : U32}:
208 U.injective(U32.from_nat(v(y)), y, U.to_nat_from_nat(v(y), 8n, {==}, N.le_lt_succ(v(y), 255n, hy)))