def pb_okb

bend-collections-laws-crypto@1.0.0.0 · proofs/crypto/curve25519/pow.bend:113

import Base
import bend-collections-laws-crypto@1.0.0.0/src/crypto/curve25519/field.bend as F
import bend-collections-laws-crypto@1.0.0.0/proofs/crypto/curve25519/limbs.bend as LM
import bend-collections-laws-crypto@1.0.0.0/proofs/crypto/curve25519/mulw.bend as MW

113def pb_okb(+one: Nat, +h1: {one == 1n : Nat}, +b: Bool, +x: List<&2, U32>, +acc: List<&2, U32>, +hx: {LM.okb(32n, x, 255n) == True{} : Bool}, +ha: {LM.okb(32n, acc, 255n) == True{} : Bool}) -> {LM.okb(32n, F.pow_bit(b, x, acc), 255n) == True{} : Bool}:
114  match b:
115    case True{}:
116      MW.mul_okb(one, h1, F.sq(acc), x, MW.sq_okb(one, h1, acc, ha), hx)
117    case False{}:
118      MW.sq_okb(one, h1, acc, ha)