def rc_p58

bend-collections-laws-crypto@1.0.0.0 · proofs/crypto/curve25519/rel.bend:67

import Base
import bend-collections-laws-crypto@1.0.0.0/spec/crypto/curve25519/field.bend as FS
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/lib/word.bend as WD
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/pow.bend as PW
import bend-collections-laws-crypto@1.0.0.0/proofs/crypto/curve25519/cong.bend as G

67def rc_p58(+one: Nat, +h1: {one == 1n : Nat}, +pp: Nat, +hP: {Nat.add(1n+pp, 19n) == WD.sc(255n, one) : Nat}, +x: List<&2, U32>, +a: Nat, +ox: {LM.okb(32n, x, 255n) == True{} : Bool}, +cx: G.ceq(pp, FS.value(x), a)) -> G.ceq(pp, FS.value(F.pow_p58(x)), FS.fpow(1n+pp, a, Nat.div(Nat.sub(1n+pp, 5n), 8n))):
68  +P = {1n+pp : Nat}
69  +k = Nat.div(Nat.sub(P, 5n), 8n)
70  +e = G.c_trans(pp, FS.value(F.pow_p58(x)), Nat.pow(FS.value(x), k), FS.fpow(P, a, k), PW.p58_val(one, h1, pp, hP, x, ox), G.c_trans(pp, Nat.pow(FS.value(x), k), Nat.pow(a, k), FS.fpow(P, a, k), G.c_pow(pp, FS.value(x), a, k, cx), G.c_sym(pp, Nat.mod(Nat.pow(a, k), P), Nat.pow(a, k), G.c_mod(pp, Nat.pow(a, k)))))
71  e