def shr_ge_c

bend-collections-laws-crypto@1.0.0.0 · proofs/math/typed/w64sh.bend:182

import Base
import bend-collections-laws-crypto@1.0.0.0/spec/lib/common.bend as C
import bend-collections-laws-crypto@1.0.0.0/spec/math/w64.bend as SW
import bend-collections-laws-crypto@1.0.0.0/src/math/w64.bend as X
import bend-collections-laws-crypto@1.0.0.0/src/math/u64.bend as WU
import bend-collections-laws-crypto@1.0.0.0/proofs/lib/nat.bend as N

182def shr_ge_c(+l: U32, +h: U32, +k: Nat, +hge: {Nat.is_le(32n, k) == True{} : Bool}, +c: Bool, +hc: {Nat.is_le(64n, k) == c : Bool}) -> {SW.value(X.shr_ge(WU.U64{l, h}, k, c)) == C.high(k, val(l, h)) : Nat}:
183  match c:
184    case True{}:
185      zero64(l, h, k, hc)
186    case False{}:
187      shr_big(l, h, k, hge, N.not_le_lt(64n, k, hc))