PHASE 2 COMPLETE ON BETRUSTED: THE FULL POINT-LEVEL LIFT

(verify_accepts_iff_decompress, button-enforced)

Port of the risc0 decompress chain (identical v4 gen shape: same
instance naming, same RangeFrom+closure from_bytes extraction):

- source patch cee0e17: decompress step_2 negate-then-conditional-assign
  (the documented sqrt_ratio_i rewrite); extract.sh: decompress
  un-opaqued, re-extracted - the step_1/step_2 external axioms vanish
  from the template, decompress is transparent.
- Proofs/DecompressSpec.lean: dalek port, instance rename
  Shared0FieldElement51 -> SharedAFieldElement51.
- Proofs/FromBytesSpec.lean: the v4 closure-loader walk
  (range_from_index_spec + closure_call_spec; window/telescope math
  identical to dalek).
- Proofs/DecompressMain.lean: decompress_of_canonical (standard three)
  + verify_accepts_iff_decompress (corollary verbatim):

    accept  <=>  decompress(R) = [k]*(-A) + [s]*B   (as points).

check.sh: 4-tier Phase 3b; full-lift cone exactly [3 standard +
Signature + sha512_hash3 + to_bytes + Error + Error.new]. Full button
green fresh.

THE FULL POINT-LEVEL LIFT NOW HOLDS ON ALL FOUR PYRAMIDS.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
mrwulf 2026-07-06 01:53:39 +02:00
parent b64bff3ed4
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/- ──────────────────────────────────────────────────────────────────────────────
Proofs/DecompressMain.lean — phase 2, decompress step 3: THE CONSTRUCTIVE
DECOMPRESSION THEOREM.
`decompress_of_canonical`: for a valid on-curve point Q whose canonical
encoding is the bytes rb, the extracted `CompressedEdwardsY::decompress`
succeeds with `some P` — a valid on-curve point denoting exactly Q.
The chain: from_bytes recovers the y-residue (the sign bit at 2²⁵⁵ is
discarded — from_bytes_spec is exact below it); u = y²1 and
v = d·y²+1 are built by certified ops with ⟪EDWARDS_D⟫ = d
(edwards_d_spec + edD_char, cancelled by 121666 ≠ 0); Q's own
x-coordinate witnesses that u/v is a square (x_sq_of_onCurve), so
sqrt_ratio_i succeeds with the even-parity root; the sign bit — Q's
x-parity, extracted from byte 31 — selects between ±root, and the
parity-injectivity argument (enc_inj_coord, on-curve invariance of x²)
pins the selected root to edX Q. The result point {X, Y, 1, X·Y} is
ExtValid, on-curve, and denotes Q.
────────────────────────────────────────────────────────────────────────────── -/
import Proofs.FromBytesSpec
open Aeneas Aeneas.Std Result
open curve25519_dalek
set_option maxHeartbeats 8000000
set_option linter.unusedSimpArgs false
set_option maxRecDepth 8000
namespace CurveFieldProofs
open Aeneas.Std.WP
/-- ⟪EDWARDS_D⟫ is THE curve constant d. -/
theorem edwards_d_denote :
backend.serial.u64.constants.EDWARDS_D ⦃ D => Bnd D (2^52) ∧ ⟪D⟫ = edD ⦄ := by
apply spec_mono edwards_d_spec
intro D ⟨hb, hd⟩
refine ⟨hb, ?_⟩
have h121666 : (121666 : Fp) ≠ 0 := by
have h : ((121666 : ) : Fp) ≠ 0 := natCast_ne_zero_of_mod (by decide)
exact_mod_cast h
have hchar := edD_char
have : (121666 : Fp) * (⟪D⟫ - edD) = 0 := by linear_combination hd - hchar
rcases mul_eq_zero.mp this with h | h
· exact absurd h h121666
· linear_combination h
open ed25519_dalek in
/-- **THE CONSTRUCTIVE DECOMPRESSION THEOREM**: canonical encodings of
valid on-curve points decompress to them. -/
theorem decompress_of_canonical (Q : EdPoint) (hQv : ExtValid Q) (hQc : OnCurveExt Q)
(rb : Std.Array Std.U8 32#usize)
(b0 b1 b2 b3 b4 b5 b6 b7 b8 b9 b10 b11 b12 b13 b14 b15 b16 b17 b18 b19 b20 b21 b22 b23 b24 b25 b26 b27 b28 b29 b30 b31 : Std.U8)
(hbl : (↑rb : List Std.U8) = [b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, b12, b13, b14, b15, b16, b17, b18, b19, b20, b21, b22, b23, b24, b25, b26, b27, b28, b29, b30, b31])
(henc : bytesVal rb = (edY Q).val + ((edX Q).val % 2) * 2^255) :
edwards.CompressedEdwardsY.decompress rb ⦃ o =>
∃ Pt : EdPoint, o = some Pt ∧ ExtValid Pt ∧ OnCurveExt Pt ∧ edPt Pt = edPt Q ⦄ := by
haveI : NeZero P := ⟨by unfold P; norm_num⟩
unfold edwards.CompressedEdwardsY.decompress curve25519_dalek.edwards.decompress.step_1
-- as_bytes is the identity; parse y
simp only [edwards.CompressedEdwardsY.as_bytes, bind_tc_ok]
step with (from_bytes_spec rb b0 b1 b2 b3 b4 b5 b6 b7 b8 b9 b10 b11 b12 b13
b14 b15 b16 b17 b18 b19 b20 b21 b22 b23 b24 b25 b26 b27 b28 b29 b30 b31 hbl)
as ⟨Y, hbY, hYv⟩
-- the parsed field element denotes edY Q
have hyresid : (edY Q).val < 2^255 :=
lt_of_lt_of_le (ZMod.val_lt _) (by unfold P; norm_num)
have hparle : (edX Q).val % 2 ≤ 1 := Nat.le_of_lt_succ (Nat.mod_lt _ (by norm_num))
have hYval : feVal Y = (edY Q).val := by
rw [hYv, henc]
have : ((edY Q).val + (edX Q).val % 2 * 2^255) % 2^255 = (edY Q).val := by
rcases Nat.mod_two_eq_zero_or_one (edX Q).val with h | h <;> rw [h] <;> omega
exact this
have hYden : ⟪Y⟫ = edY Q := by
apply ZMod.val_injective
show (⟪Y⟫).val = (edY Q).val
unfold denote
rw [ZMod.val_natCast, hYval, Nat.mod_eq_of_lt (ZMod.val_lt _)]
-- Z = 1
step with one_spec as ⟨Z, hbZ, hZv⟩
-- YY = y², u = y² 1
step with (square_spec' Y (Bnd.mono hbY (by norm_num))) as ⟨YY, hbYY, hYY⟩
obtain ⟨yy0, yy1, yy2, yy3, yy4, hyyl⟩ := Fe.exists_limbs YY
obtain ⟨z0, z1, z2, z3, z4, hzl⟩ := Fe.exists_limbs Z
step with (sub_spec YY Z yy0 yy1 yy2 yy3 yy4 z0 z1 z2 z3 z4 hyyl hzl
(Bnd.mono hbYY (by norm_num)) (Bnd.mono hbZ (by norm_num))) as ⟨u, hbu, huv⟩
-- D, then v = d·y² + 1
step with edwards_d_denote as ⟨D, hbD, hDv⟩
step with (mul_spec' YY D (Bnd.mono hbYY (by norm_num)) (Bnd.mono hbD (by norm_num)))
as ⟨vd, hbvd, hvd⟩
step with (add_spec'' vd Z (Bnd.mono hbvd (by norm_num)) (Bnd.mono hbZ (by norm_num)))
as ⟨v, hbv, hvv⟩
-- interpreted u, v
have huval : ⟪u⟫ = (edY Q)^2 - 1 := by
rw [huv, hYY, hYden, hZv]
ring
have hvval : ⟪v⟫ = 1 + edD * (edY Q)^2 := by
rw [hvv, hvd, hYY, hYden, hDv, hZv]
ring
-- Q's x witnesses the square; v never vanishes
have hvne : ⟪v⟫ ≠ 0 := by rw [hvval]; exact one_add_d_y_sq_ne_zero _
have hwit : (edX Q) ^ 2 * ⟪v⟫ = ⟪u⟫ := by
rw [hvval, huval]
exact x_sq_of_onCurve hQc
-- the square root succeeds with the even-parity root
step with (sqrt_ratio_i_sq_spec u v (Bnd.mono hbu (by norm_num))
(Bnd.mono hbv (by norm_num)) hvne (edX Q) hwit) as ⟨sc, sr, hc1, hbr, hrsq, hrpar⟩
-- the validity Choice converts to true
simp only [core.convert.IntoFrom.into, Bool.Insts.CoreConvertFromChoice.from,
bind_tc_ok]
rw [show (sc.val != 0) = true from by simp [hc1]]
rw [if_pos rfl]
-- ── step_2: the sign select ──────────────────────────────────────────────
unfold curve25519_dalek.edwards.decompress.step_2
simp only [edwards.CompressedEdwardsY.as_bytes, bind_tc_ok]
step as ⟨t31, ht31⟩
simp [hbl] at ht31
step as ⟨sgn, hsgn⟩
simp only [subtle.Choice.Insts.CoreConvertFromU8.from, bind_tc_ok]
-- the sign bit is Q's x-parity
have hb31v : b31.val = (edY Q).val / 2^248 + ((edX Q).val % 2) * 2^7 := by
have hexp : bytesVal rb = b0.val + b1.val * 2^8 + b2.val * 2^16 + b3.val * 2^24 + b4.val * 2^32 + b5.val * 2^40 + b6.val * 2^48 + b7.val * 2^56 + b8.val * 2^64 + b9.val * 2^72 + b10.val * 2^80 + b11.val * 2^88 + b12.val * 2^96 + b13.val * 2^104 + b14.val * 2^112 + b15.val * 2^120 + b16.val * 2^128 + b17.val * 2^136 + b18.val * 2^144 + b19.val * 2^152 + b20.val * 2^160 + b21.val * 2^168 + b22.val * 2^176 + b23.val * 2^184 + b24.val * 2^192 + b25.val * 2^200 + b26.val * 2^208 + b27.val * 2^216 + b28.val * 2^224 + b29.val * 2^232 + b30.val * 2^240 + b31.val * 2^248 := by
simp only [bytesVal, hbl]
rw [henc] at hexp
have hB0 : b0.val < 256 := by scalar_tac
have hB1 : b1.val < 256 := by scalar_tac
have hB2 : b2.val < 256 := by scalar_tac
have hB3 : b3.val < 256 := by scalar_tac
have hB4 : b4.val < 256 := by scalar_tac
have hB5 : b5.val < 256 := by scalar_tac
have hB6 : b6.val < 256 := by scalar_tac
have hB7 : b7.val < 256 := by scalar_tac
have hB8 : b8.val < 256 := by scalar_tac
have hB9 : b9.val < 256 := by scalar_tac
have hB10 : b10.val < 256 := by scalar_tac
have hB11 : b11.val < 256 := by scalar_tac
have hB12 : b12.val < 256 := by scalar_tac
have hB13 : b13.val < 256 := by scalar_tac
have hB14 : b14.val < 256 := by scalar_tac
have hB15 : b15.val < 256 := by scalar_tac
have hB16 : b16.val < 256 := by scalar_tac
have hB17 : b17.val < 256 := by scalar_tac
have hB18 : b18.val < 256 := by scalar_tac
have hB19 : b19.val < 256 := by scalar_tac
have hB20 : b20.val < 256 := by scalar_tac
have hB21 : b21.val < 256 := by scalar_tac
have hB22 : b22.val < 256 := by scalar_tac
have hB23 : b23.val < 256 := by scalar_tac
have hB24 : b24.val < 256 := by scalar_tac
have hB25 : b25.val < 256 := by scalar_tac
have hB26 : b26.val < 256 := by scalar_tac
have hB27 : b27.val < 256 := by scalar_tac
have hB28 : b28.val < 256 := by scalar_tac
have hB29 : b29.val < 256 := by scalar_tac
have hB30 : b30.val < 256 := by scalar_tac
have hB31 : b31.val < 256 := by scalar_tac
omega
have hsgnv : sgn.val = (edX Q).val % 2 := by
rw [hsgn, ht31, nat_shr, hb31v]
have : (edY Q).val / 2^248 < 2^7 := by
have := hyresid
omega
omega
-- root, then select
obtain ⟨r0, r1, r2, r3, r4, hrl⟩ := Fe.exists_limbs sr
unfold SharedAFieldElement51.Insts.CoreOpsArithNegFieldElement51.neg
step with (neg_spec sr r0 r1 r2 r3 r4 hrl (Bnd.mono hbr (by norm_num)))
as ⟨Xn, hbXn, hXnv⟩
obtain ⟨n0, n1, n2, n3, n4, hnl⟩ := Fe.exists_limbs Xn
step with (fe_cond_assign_spec sr Xn sgn r0 r1 r2 r3 r4 n0 n1 n2 n3 n4 hrl hnl)
as ⟨X1, hX1l⟩
-- Bnd X1 first (needed by the T-multiply)
have hbX1 : Bnd X1 (2^52) := by
have hb1 : Bnd sr (2^52) := hbr
have hb2 : Bnd Xn (2^52) := hbXn
split at hX1l
· rw [Bnd_eq X1 r0 r1 r2 r3 r4 _ (by rw [hX1l])]
rw [Bnd_eq sr r0 r1 r2 r3 r4 _ hrl] at hb1
exact hb1
· rw [Bnd_eq X1 n0 n1 n2 n3 n4 _ (by rw [hX1l])]
rw [Bnd_eq Xn n0 n1 n2 n3 n4 _ hnl] at hb2
exact hb2
-- T = X1·Y
step with (mul_spec' X1 Y (Bnd.mono hbX1 (by norm_num)) (Bnd.mono hbY (by norm_num)))
as ⟨T, hbT, hTv⟩
try simp only [spec_ok]
-- ── the selected root IS edX Q ───────────────────────────────────────────
-- the root is on-curve (only x² appears in the equation)
have hrsq' : ⟪sr⟫ ^ 2 = (edX Q) ^ 2 := by
have h := hrsq
rw [hwit.symm] at h
have hcancel : (⟪sr⟫ ^ 2 - (edX Q) ^ 2) * ⟪v⟫ = 0 := by linear_combination h
rcases mul_eq_zero.mp hcancel with h' | h'
· linear_combination h'
· exact absurd h' hvne
have hronc : OnCurve ⟪sr⟫ (edY Q) := by
show -(⟪sr⟫^2) + (edY Q)^2 = 1 + edD * ⟪sr⟫^2 * (edY Q)^2
rw [hrsq']
exact hQc
have hX1den : ⟪X1⟫ = ⟪sr⟫ ⟪X1⟫ = -⟪sr⟫ := by
split at hX1l
· left
unfold denote
rw [feVal_eq X1 r0 r1 r2 r3 r4 (by rw [hX1l]),
feVal_eq sr r0 r1 r2 r3 r4 hrl]
· right
have : ⟪X1⟫ = ⟪Xn⟫ := by
unfold denote
rw [feVal_eq X1 n0 n1 n2 n3 n4 (by rw [hX1l]),
feVal_eq Xn n0 n1 n2 n3 n4 hnl]
rw [this, hXnv]
have hX1x : ⟪X1⟫ = edX Q := by
rcases Nat.mod_two_eq_zero_or_one (edX Q).val with hx | hx
· -- x has even parity: no flip (sgn = 0), root already matches by parity
have hs0 : sgn.val = 0 := by rw [hsgnv, hx]
have hkeep : ⟪X1⟫ = ⟪sr⟫ := by
split at hX1l
· unfold denote
rw [feVal_eq X1 r0 r1 r2 r3 r4 (by rw [hX1l]),
feVal_eq sr r0 r1 r2 r3 r4 hrl]
· exact absurd hs0 (by assumption)
rw [hkeep]
exact enc_inj_coord hronc hQc (by rw [hrpar, hx])
· -- x odd: the flip fires; root has odd parity (root even, nonzero)
have hs1 : sgn.val ≠ 0 := by rw [hsgnv, hx]; norm_num
have hflip : ⟪X1⟫ = -⟪sr⟫ := by
split at hX1l
· exact absurd (by assumption) hs1
· have : ⟪X1⟫ = ⟪Xn⟫ := by
unfold denote
rw [feVal_eq X1 n0 n1 n2 n3 n4 (by rw [hX1l]),
feVal_eq Xn n0 n1 n2 n3 n4 hnl]
rw [this, hXnv]
have hrnz : ⟪sr⟫ ≠ 0 := by
intro hz
rw [hz] at hrsq'
have hxz : edX Q = 0 := by
have := hrsq'.symm
have h2 : (edX Q)^2 = 0 := by linear_combination -hrsq'
exact pow_eq_zero_iff (n := 2) (by norm_num) |>.mp h2
rw [hxz] at hx
simp at hx
have hnegonc : OnCurve (-⟪sr⟫) (edY Q) := by
show -((-⟪sr⟫)^2) + (edY Q)^2 = 1 + edD * (-⟪sr⟫)^2 * (edY Q)^2
have : (-⟪sr⟫)^2 = ⟪sr⟫^2 := by ring
rw [this, hrsq']
exact hQc
have hnegpar : (-⟪sr⟫).val % 2 = 1 := by
rw [ZMod.neg_val, if_neg hrnz]
have hlt := ZMod.val_lt ⟪sr⟫
have hpodd : P % 2 = 1 := by unfold P; norm_num
have hpos : 0 < (⟪sr⟫).val := by
rcases Nat.eq_zero_or_pos (⟪sr⟫).val with h | h
· exact absurd ((ZMod.val_eq_zero _).mp h) hrnz
· exact h
omega
rw [hflip]
exact enc_inj_coord hnegonc hQc (by rw [hnegpar, hx])
-- ── assemble the point ───────────────────────────────────────────────────
refine ⟨_, rfl, ?_, ?_, ?_⟩
· -- ExtValid
refine ⟨?_, Bnd.mono hbY (by norm_num), Bnd.mono hbZ (by norm_num), ?_, ?_, ?_⟩
· exact hbX1
· exact Bnd.mono hbT (by norm_num)
· rw [hZv]; norm_num
· -- coherence X·Y = Z·T
show ⟪X1⟫ * ⟪Y⟫ = ⟪Z⟫ * ⟪T⟫
rw [hTv, hZv]
ring
· -- on-curve
show OnCurve (⟪X1⟫ / ⟪Z⟫) (⟪Y⟫ / ⟪Z⟫)
rw [hZv, div_one, div_one, hX1x, hYden]
exact hQc
· -- denotes Q
show (⟪X1⟫ / ⟪Z⟫, ⟪Y⟫ / ⟪Z⟫) = edPt Q
rw [hZv, div_one, div_one, hX1x, hYden]
rfl
open ed25519_dalek in
/-- **THE FULL POINT-LEVEL LIFT.** Under the point-equation premises, the
signature's R bytes DECOMPRESS to a valid on-curve point Pt, and the
verifier accepts **iff** Pt equals the recomputed [k]·(A) + [s]·B:
accept ⇔ decompress(R) = [k]·(A) + [s]·B (as points).
This is the constructive capstone of phase 2: byte comparison ↔
canonical-encoding equality ↔ point equality ↔ decompressed-point
equality, every link machine-checked over the extracted code. -/
theorem verify_accepts_iff_decompress
(key : verifying.VerifyingKey) (msg : Slice Std.U8) (sig : ed25519.Signature)
(val : signature.InternalSignature)
(er : curve25519_dalek.edwards.CompressedEdwardsY)
(e r1 : Std.Array Std.U8 32#usize)
(hparse : signature.InternalSignature.Insts.CoreConvertTryFromShared0SignatureError.try_from sig
= ok (core.result.Result.Ok val))
(hrec : verifying.recompute_r_sha512 key val msg = ok er)
(he : curve25519_dalek.edwards.CompressedEdwardsY.as_bytes er = ok e)
(hr1 : curve25519_dalek.edwards.CompressedEdwardsY.as_bytes val.R = ok r1)
(hkv : ExtValid key.point) (hkc : OnCurveExt key.point)
(t0 t1 t2 t3 t4 t5 t6 t7 t8 t9 t10 t11 t12 t13 t14 t15 t16 t17 t18 t19 t20 t21 t22 t23 t24 t25 t26 t27 t28 t29 t30 t31 : Std.U8)
(hsb : (↑val.s.bytes : List Std.U8) = [t0, t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11, t12, t13, t14, t15, t16, t17, t18, t19, t20, t21, t22, t23, t24, t25, t26, t27, t28, t29, t30, t31])
(Vs : ) (hVs : Vs = t0.val + t1.val * 2^8 + t2.val * 2^16 + t3.val * 2^24 + t4.val * 2^32 + t5.val * 2^40 + t6.val * 2^48 + t7.val * 2^56 + t8.val * 2^64 + t9.val * 2^72 + t10.val * 2^80 + t11.val * 2^88 + t12.val * 2^96 + t13.val * 2^104 + t14.val * 2^112 + t15.val * 2^120 + t16.val * 2^128 + t17.val * 2^136 + t18.val * 2^144 + t19.val * 2^152 + t20.val * 2^160 + t21.val * 2^168 + t22.val * 2^176 + t23.val * 2^184 + t24.val * 2^192 + t25.val * 2^200 + t26.val * 2^208 + t27.val * 2^216 + t28.val * 2^224 + t29.val * 2^232 + t30.val * 2^240 + t31.val * 2^248)
(hVslt : Vs < 2^253)
(Q : EdPoint) (hQv : ExtValid Q) (hQc : OnCurveExt Q)
(b0 b1 b2 b3 b4 b5 b6 b7 b8 b9 b10 b11 b12 b13 b14 b15 b16 b17 b18 b19 b20 b21 b22 b23 b24 b25 b26 b27 b28 b29 b30 b31 : Std.U8)
(hbl : (↑r1 : List Std.U8) = [b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, b12, b13, b14, b15, b16, b17, b18, b19, b20, b21, b22, b23, b24, b25, b26, b27, b28, b29, b30, b31])
(henc : bytesVal r1 = (edY Q).val + ((edX Q).val % 2) * 2^255) :
∃ (R' Pt : EdPoint), ExtValid R' ∧ OnCurveExt R' ∧
curve25519_dalek.edwards.CompressedEdwardsY.decompress r1 = ok (some Pt) ∧
ExtValid Pt ∧ OnCurveExt Pt ∧
(verifying.verify_sha512 key msg sig = ok (core.result.Result.Ok ())
↔ edPt Pt = edPt R') := by
obtain ⟨R', hRv, hRc, hiff⟩ := verify_accepts_iff_point_eq key msg sig val er e r1
hparse hrec he hr1 hkv hkc
t0 t1 t2 t3 t4 t5 t6 t7 t8 t9 t10 t11 t12 t13 t14 t15 t16 t17 t18 t19 t20 t21 t22 t23 t24 t25 t26 t27 t28 t29 t30 t31 hsb Vs hVs hVslt Q hQv hQc henc
obtain ⟨o, ho, Pt, hosome, hPv, hPc, hPQ⟩ := spec_imp_exists
(decompress_of_canonical Q hQv hQc r1 b0 b1 b2 b3 b4 b5 b6 b7 b8 b9 b10 b11 b12 b13 b14 b15 b16 b17 b18 b19 b20 b21 b22 b23 b24 b25 b26 b27 b28 b29 b30 b31 hbl henc)
refine ⟨R', Pt, hRv, hRc, ?_, hPv, hPc, ?_⟩
· rw [ho, hosome]
· rw [hiff, hPQ]
end CurveFieldProofs

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/- ──────────────────────────────────────────────────────────────────────────────
Proofs/DecompressSpec.lean — phase 2, the constructive decompress chain,
part 1: the arithmetic ingredients of `sqrt_ratio_i`.
· `pow_p58_spec` — a^((p5)/8) via the pow22501 chain (Fermat-style,
the invert_spec pattern with exponent 2²⁵² 3);
· √1 — already certified (ConstSpecs.sqrt_m1_spec);
· `fe_ct_eq_spec` — the constant-time field comparison decides
denotational equality: to_bytes is CANONICAL
(to_bytes_spec), so byte equality is residue
equality in both directions.
Part 2 (sequel): the sqrt_ratio_i success-case walk, from_bytes, and
`decompress_of_canonical` — the constructive upgrade of the point-level
verification equation.
────────────────────────────────────────────────────────────────────────────── -/
import Proofs.PointEqSpec
import Proofs.InvertSpec
open Aeneas Aeneas.Std Result
open curve25519_dalek
set_option maxHeartbeats 4000000
set_option linter.unusedSimpArgs false
set_option exponentiation.threshold 600
namespace CurveFieldProofs
open Aeneas.Std.WP
/-- a^((p5)/8) = a^(2²⁵² 3): the pow22501 chain squared twice and folded
once more with a — the invert_spec pattern. -/
theorem pow_p58_spec (a : Fe) (hba : Bnd a (2^54)) :
field.FieldElement51.pow_p58 a ⦃ r => Bnd r (2^52) ∧ ⟪r⟫ = ⟪a⟫ ^ (2^252 - 3) ⦄ := by
unfold field.FieldElement51.pow_p58
let* ⟨ t19, t3, h1, h2, h3, h4 ⟩ ← pow22501_spec by bnd
let* ⟨ t20, t20_post1, t20_post2 ⟩ ← pow2k_spec' by bnd
let* ⟨ r, r_post1, r_post2 ⟩ ← mul_spec' by bnd
refine ⟨by bnd, ?_⟩
rw [r_post2, t20_post2, h3]
rw [← pow_mul, ← pow_succ']
congr 1
/- √1: `sqrt_m1_spec` (ConstSpecs.lean) already pins the SQRT_M1 constant:
Bnd s (2⁵²) ∧ ⟪s⟫·⟪s⟫ = 1 — reused as-is by the sqrt walk below. -/
/-- Byte-array value equality forces list equality (the converse of congr):
little-endian digits are unique. -/
theorem bytesVal_inj (sa sb : Std.Array Std.U8 32#usize)
(h : bytesVal sa = bytesVal sb) : (↑sa : List Std.U8) = (↑sb : List Std.U8) := by
obtain ⟨e0, e1, e2, e3, e4, e5, e6, e7, e8, e9, e10, e11, e12, e13, e14, e15,
e16, e17, e18, e19, e20, e21, e22, e23, e24, e25, e26, e27, e28, e29, e30, e31,
hel⟩ := Bytes32.exists_bytes sa
obtain ⟨r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, r13, r14, r15,
r16, r17, r18, r19, r20, r21, r22, r23, r24, r25, r26, r27, r28, r29, r30, r31,
hrl⟩ := Bytes32.exists_bytes sb
have hrq := (rangeEq_iff_bytesVal sa sb).mpr h
have hpt : ∀ j, j < 32 → sa.val[j]! = sb.val[j]! := fun j hj => hrq j (Nat.zero_le _) hj
have h0 : e0 = r0 := by simpa [hel, hrl] using hpt 0 (by norm_num)
have h1 : e1 = r1 := by simpa [hel, hrl] using hpt 1 (by norm_num)
have h2 : e2 = r2 := by simpa [hel, hrl] using hpt 2 (by norm_num)
have h3 : e3 = r3 := by simpa [hel, hrl] using hpt 3 (by norm_num)
have h4 : e4 = r4 := by simpa [hel, hrl] using hpt 4 (by norm_num)
have h5 : e5 = r5 := by simpa [hel, hrl] using hpt 5 (by norm_num)
have h6 : e6 = r6 := by simpa [hel, hrl] using hpt 6 (by norm_num)
have h7 : e7 = r7 := by simpa [hel, hrl] using hpt 7 (by norm_num)
have h8 : e8 = r8 := by simpa [hel, hrl] using hpt 8 (by norm_num)
have h9 : e9 = r9 := by simpa [hel, hrl] using hpt 9 (by norm_num)
have h10 : e10 = r10 := by simpa [hel, hrl] using hpt 10 (by norm_num)
have h11 : e11 = r11 := by simpa [hel, hrl] using hpt 11 (by norm_num)
have h12 : e12 = r12 := by simpa [hel, hrl] using hpt 12 (by norm_num)
have h13 : e13 = r13 := by simpa [hel, hrl] using hpt 13 (by norm_num)
have h14 : e14 = r14 := by simpa [hel, hrl] using hpt 14 (by norm_num)
have h15 : e15 = r15 := by simpa [hel, hrl] using hpt 15 (by norm_num)
have h16 : e16 = r16 := by simpa [hel, hrl] using hpt 16 (by norm_num)
have h17 : e17 = r17 := by simpa [hel, hrl] using hpt 17 (by norm_num)
have h18 : e18 = r18 := by simpa [hel, hrl] using hpt 18 (by norm_num)
have h19 : e19 = r19 := by simpa [hel, hrl] using hpt 19 (by norm_num)
have h20 : e20 = r20 := by simpa [hel, hrl] using hpt 20 (by norm_num)
have h21 : e21 = r21 := by simpa [hel, hrl] using hpt 21 (by norm_num)
have h22 : e22 = r22 := by simpa [hel, hrl] using hpt 22 (by norm_num)
have h23 : e23 = r23 := by simpa [hel, hrl] using hpt 23 (by norm_num)
have h24 : e24 = r24 := by simpa [hel, hrl] using hpt 24 (by norm_num)
have h25 : e25 = r25 := by simpa [hel, hrl] using hpt 25 (by norm_num)
have h26 : e26 = r26 := by simpa [hel, hrl] using hpt 26 (by norm_num)
have h27 : e27 = r27 := by simpa [hel, hrl] using hpt 27 (by norm_num)
have h28 : e28 = r28 := by simpa [hel, hrl] using hpt 28 (by norm_num)
have h29 : e29 = r29 := by simpa [hel, hrl] using hpt 29 (by norm_num)
have h30 : e30 = r30 := by simpa [hel, hrl] using hpt 30 (by norm_num)
have h31 : e31 = r31 := by simpa [hel, hrl] using hpt 31 (by norm_num)
rw [hel, hrl, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9, h10, h11, h12, h13,
h14, h15, h16, h17, h18, h19, h20, h21, h22, h23, h24, h25, h26, h27,
h28, h29, h30, h31]
/-- Lists determine `bytesVal`. -/
theorem bytesVal_congr {sa sb : Std.Array Std.U8 32#usize}
(h : (↑sa : List Std.U8) = ↑sb) : bytesVal sa = bytesVal sb := by
unfold bytesVal
rw [h]
/-- **The canonical-bytes bridge**: for canonical serializations, byte-list
equality IS denotational equality. -/
theorem bytes_eq_iff_denote {a b : Fe} {sa sb : Std.Array Std.U8 32#usize}
(hsa : bytesVal sa = feVal a % P) (hsb : bytesVal sb = feVal b % P) :
(↑sa : List Std.U8) = ↑sb ↔ ⟪a⟫ = ⟪b⟫ := by
haveI : NeZero P := ⟨by unfold P; norm_num⟩
have hmod : ⟪a⟫ = ⟪b⟫ ↔ feVal a % P = feVal b % P := by
unfold denote
rw [ZMod.natCast_eq_natCast_iff]
exact ⟨fun h => h, fun h => h⟩
constructor
· intro h
rw [hmod, ← hsa, ← hsb]
exact bytesVal_congr h
· intro h
apply bytesVal_inj
rw [hsa, hsb]
exact hmod.mp h
/-- **The constant-time field comparison decides denotational equality**:
to_bytes is canonical, so byte equality IS residue equality. -/
theorem fe_ct_eq_spec (a b : Fe) :
backend.serial.u64.field.FieldElement51.Insts.SubtleConstantTimeEq.ct_eq a b
⦃ c => (c.val = 0 c.val = 1) ∧ (c.val = 1 ↔ ⟪a⟫ = ⟪b⟫) ⦄ := by
unfold backend.serial.u64.field.FieldElement51.Insts.SubtleConstantTimeEq.ct_eq
step with (to_bytes_spec' a) as ⟨sa, hsa⟩
step as ⟨la, hla⟩
step with (to_bytes_spec' b) as ⟨sb, hsb⟩
step as ⟨lb, hlb⟩
simp only [Slice.Insts.SubtleConstantTimeEq.ct_eq]
try simp only [spec_ok]
have hlav : la.val = sa.val := by rw [hla]; rfl
have hlbv : lb.val = sb.val := by rw [hlb]; rfl
rw [hlav, hlbv]
have hbridge := bytes_eq_iff_denote hsa hsb
by_cases heq : (↑sa : List Std.U8) = ↑sb
· rw [if_pos heq]
exact ⟨Or.inr rfl, fun _ => hbridge.mp heq, fun _ => rfl⟩
· rw [if_neg heq]
refine ⟨Or.inl rfl, fun h01 => absurd h01 (by norm_num), fun hab => ?_⟩
exact absurd (hbridge.mpr hab) heq
/-- u64 constant-time assign keeps `self` iff the choice is 0 (rfl on the
FunsExternal model; restated locally — Proofs.Basic is a parallel root
that clashes with the ConstSpecs chain). -/
theorem u64_cond_assign (a b : Std.U64) (c : subtle.Choice) :
U64.Insts.SubtleConditionallySelectable.conditional_assign a b c
= ok (if c.val = 0 then a else b) := rfl
/-- **Limb-wise constant-time selection on field elements**: keeps `self`
iff the choice is 0 — the in-place flavor `sqrt_ratio_i` uses twice
(root flip and sign normalization). -/
theorem fe_cond_assign_spec (a b : Fe) (c : subtle.Choice)
(x0 x1 x2 x3 x4 y0 y1 y2 y3 y4 : U64)
(ha : (↑a : List U64) = [x0, x1, x2, x3, x4])
(hb : (↑b : List U64) = [y0, y1, y2, y3, y4]) :
backend.serial.u64.field.FieldElement51.Insts.SubtleConditionallySelectable.conditional_assign
a b c
⦃ r => (↑r : List U64)
= if c.val = 0 then [x0, x1, x2, x3, x4] else [y0, y1, y2, y3, y4] ⦄ := by
unfold backend.serial.u64.field.FieldElement51.Insts.SubtleConditionallySelectable.conditional_assign
step as ⟨i0, back0, hi0, hback0⟩
step as ⟨i1, hi1⟩
try simp only [u64_cond_assign, bind_tc_ok]
step as ⟨i3, back1, hi3, hback1⟩
try simp only [hback0] at *
step as ⟨i4, hi4⟩
try simp only [u64_cond_assign, bind_tc_ok]
step as ⟨i6, back2, hi6, hback2⟩
try simp only [hback1] at *
step as ⟨i7, hi7⟩
try simp only [u64_cond_assign, bind_tc_ok]
step as ⟨i9, back3, hi9, hback3⟩
try simp only [hback2] at *
step as ⟨i10, hi10⟩
try simp only [u64_cond_assign, bind_tc_ok]
step as ⟨i12, back4, hi12, hback4⟩
try simp only [hback3] at *
step as ⟨i13, hi13⟩
try simp only [u64_cond_assign, bind_tc_ok]
try simp only [spec_ok]
by_cases hc : c.val = 0
· simp only [hc, if_pos rfl] at *
simp_all [Array.set_val_eq, ha, hb]
· simp only [if_neg hc] at *
simp_all [Array.set_val_eq, ha, hb]
/-- **THE SQUARE-ROOT CORE** (pure 𝔽_p): if u/v is a square (witness x)
with v ≠ 0, the candidate r = (u·v³)·(u·v⁷)^((p5)/8) satisfies
v·r² = ±u — the algebraic heart of `sqrt_ratio_i`. The v-part of the
exponent collapses by Fermat; the residual x^((p1)/2) is ±1. -/
theorem sqrt_core (u v x : Fp) (hv : v ≠ 0) (hx : x ^ 2 * v = u) :
v * (u * v^3 * (u * v^7)^(2^252 - 3))^2 = u
v * (u * v^3 * (u * v^7)^(2^252 - 3))^2 = -u := by
haveI : Fact (Nat.Prime P) := ⟨P_prime⟩
by_cases hx0 : x = 0
· -- x = 0 forces u = 0 and the candidate is 0 = u
left
have hu : u = 0 := by rw [← hx, hx0]; ring
rw [hu]
ring
· set w : Fp := u * v^7 with hwdef
have hw : w = x^2 * v^8 := by rw [hwdef, ← hx]; ring
have hfer_v : v ^ (P - 1) = 1 := ZMod.pow_card_sub_one_eq_one hv
have hfer_x2 : (x ^ ((P-1)/2))^2 = 1 := by
rw [← pow_mul]
have he : (P-1)/2 * 2 = P - 1 := by unfold P; norm_num
rw [he]
exact ZMod.pow_card_sub_one_eq_one hx0
have hpm : x ^ ((P-1)/2) = 1 x ^ ((P-1)/2) = -1 := by
have hfac : (x ^ ((P-1)/2) - 1) * (x ^ ((P-1)/2) + 1) = 0 := by
linear_combination hfer_x2
rcases mul_eq_zero.mp hfac with h' | h'
· left; linear_combination h'
· right; linear_combination h'
have hkey : v * (u * v^3 * w^(2^252 - 3))^2 = u * x^((P-1)/2) := by
have h1 : v * (u * v^3 * w^(2^252-3))^2 = u * w * (w^(2^252-3))^2 := by
rw [hwdef]; ring
have h2 : (w^(2^252-3) : Fp)^2 = w^(2^253-6) := by
rw [← pow_mul]
norm_num
have h3 : (u * w * w^(2^253-6) : Fp) = u * w^(2^253-5) := by
have : (w * w^(2^253-6) : Fp) = w^(2^253-5) := by
rw [← pow_succ']
norm_num
rw [mul_assoc, this]
rw [h1, h2, h3, hw]
have h4 : ((x^2 * v^8 : Fp))^(2^253-5) = x^(2^254-10) * v^(2^256-40) := by
rw [mul_pow, ← pow_mul, ← pow_mul]
norm_num
rw [h4]
have h5 : (v : Fp)^(2^256-40) = 1 := by
have he : (2^256 - 40 : ) = (P - 1) * 2 := by unfold P; norm_num
rw [he, pow_mul, hfer_v, one_pow]
have h6 : (2^254 - 10 : ) = (P-1)/2 := by unfold P; norm_num
rw [h5, h6]
ring
rcases hpm with h | h
· left; rw [hkey, h, mul_one]
· right; rw [hkey, h]; ring
/-- In 𝔽_p (p odd), an element equal to its own negative is zero. -/
theorem eq_neg_self_iff_zero (a : Fp) : a = -a ↔ a = 0 := by
constructor
· intro h
have h2 : (2 : Fp) * a = 0 := by linear_combination h
rcases mul_eq_zero.mp h2 with h' | h'
· exact absurd h' two_ne_zero_Fp
· exact h'
· intro h; rw [h]; ring
/-- 1 + √1 does not vanish (else 1 = 1, contradicting p odd). -/
theorem one_add_i_ne_zero {i : Fp} (hi : i * i = -1) : (1 : Fp) + i ≠ 0 := by
intro h
have him : i = -1 := by linear_combination h
rw [him] at hi
have : (2 : Fp) = 0 := by linear_combination hi
exact two_ne_zero_Fp this
/-- **THE SQUARE-ROOT WALK** (success case): if u/v is a square (witness x,
v ≠ 0), `sqrt_ratio_i` returns choice 1 and the even-parity root:
r² · v = u with r's canonical residue even. -/
theorem sqrt_ratio_i_sq_spec (u v : Fe) (hbu : Bnd u (2^54)) (hbv : Bnd v (2^54))
(hvne : ⟪v⟫ ≠ 0) (x : Fp) (hx : x ^ 2 * ⟪v⟫ = ⟪u⟫) :
field.FieldElement51.sqrt_ratio_i u v ⦃ cr =>
cr.1.val = 1 ∧ Bnd cr.2 (2^52) ∧
⟪cr.2⟫ ^ 2 * ⟪v⟫ = ⟪u⟫ ∧ (⟪cr.2⟫).val % 2 = 0 ⦄ := by
haveI : NeZero P := ⟨by unfold P; norm_num⟩
unfold field.FieldElement51.sqrt_ratio_i
-- the arithmetic chain: v³, v⁷, u·v³, u·v⁷, (u·v⁷)^((p5)/8), r, r², check
let* ⟨ fe, hbfe, hfe ⟩ ← square_spec' by bnd
let* ⟨ v3, hbv3, hv3 ⟩ ← mul_spec' by bnd
let* ⟨ fe1, hbfe1, hfe1 ⟩ ← square_spec' by bnd
let* ⟨ v7, hbv7, hv7 ⟩ ← mul_spec' by bnd
let* ⟨ fe2, hbfe2, hfe2 ⟩ ← mul_spec' by bnd
let* ⟨ fe3, hbfe3, hfe3 ⟩ ← mul_spec' by bnd
let* ⟨ fe4, hbfe4, hfe4 ⟩ ← pow_p58_spec by bnd
let* ⟨ r, hbr, hr ⟩ ← mul_spec' by bnd
let* ⟨ fe5, hbfe5, hfe5 ⟩ ← square_spec' by bnd
let* ⟨ check, hbcheck, hcheck ⟩ ← mul_spec' by bnd
-- √1
step with sqrt_m1_spec as ⟨im, hbim, him⟩
-- the three constant-time checks
step with (fe_ct_eq_spec check u) as ⟨correct, hc01, hciff⟩
-- u (needs u's limbs)
obtain ⟨u0, u1, u2, u3, u4, hul⟩ := Fe.exists_limbs u
unfold SharedAFieldElement51.Insts.CoreOpsArithNegFieldElement51.neg
step with (neg_spec u u0 u1 u2 u3 u4 hul (by bnd)) as ⟨fe6, hbfe6, hfe6⟩
step with (fe_ct_eq_spec check fe6) as ⟨flipped, hf01, hfiff⟩
let* ⟨ fe7, hbfe7, hfe7 ⟩ ← mul_spec' by bnd
step with (fe_ct_eq_spec check fe7) as ⟨flipped_i, hfi01, hfiiff⟩
-- r = √1 · r
let* ⟨ r_prime, hbrp, hrp ⟩ ← mul_spec' by bnd
-- the flip choice and the root flip
simp only [subtle.Choice.Insts.CoreOpsBitBitOrChoiceChoice.bitor, bind_tc_ok]
obtain ⟨rr0, rr1, rr2, rr3, rr4, hrl⟩ := Fe.exists_limbs r
obtain ⟨rp0, rp1, rp2, rp3, rp4, hrpl⟩ := Fe.exists_limbs r_prime
step with (fe_cond_assign_spec r r_prime _ rr0 rr1 rr2 rr3 rr4 rp0 rp1 rp2 rp3 rp4 hrl hrpl)
as ⟨r1, hr1l⟩
-- sign normalization
step with (is_negative_spec r1) as ⟨rneg, hrneg⟩
obtain ⟨q0, q1, q2, q3, q4, hq⟩ := Fe.exists_limbs r1
-- Bnd r1 (2^52): its list is one of the two bounded lists
have hbr1 : Bnd r1 (2^52) := by
have hb1 : Bnd r (2^52) := Bnd.mono hbr (by norm_num)
have hb2 : Bnd r_prime (2^52) := Bnd.mono hbrp (by norm_num)
split at hr1l
· rw [Bnd_eq r1 rr0 rr1 rr2 rr3 rr4 _ (by rw [hr1l])]
rw [Bnd_eq r rr0 rr1 rr2 rr3 rr4 _ hrl] at hb1
exact hb1
· rw [Bnd_eq r1 rp0 rp1 rp2 rp3 rp4 _ (by rw [hr1l])]
rw [Bnd_eq r_prime rp0 rp1 rp2 rp3 rp4 _ hrpl] at hb2
exact hb2
-- r1 and the parity select
step with (neg_spec r1 q0 q1 q2 q3 q4 hq (Bnd.mono hbr1 (by norm_num)))
as ⟨r_neg, hbrn, hrn⟩
obtain ⟨n0, n1, n2, n3, n4, hnl⟩ := Fe.exists_limbs r_neg
step with (fe_cond_assign_spec r1 r_neg _ q0 q1 q2 q3 q4 n0 n1 n2 n3 n4 hq hnl)
as ⟨r2, hr2l⟩
try simp only [spec_ok]
-- ── interpreted values ───────────────────────────────────────────────────
have hfe2v : ⟪fe2⟫ = ⟪u⟫ * ⟪v⟫^3 := by rw [hfe2, hv3, hfe]; ring
have hfe3v : ⟪fe3⟫ = ⟪u⟫ * ⟪v⟫^7 := by rw [hfe3, hv7, hfe1, hv3, hfe]; ring
have hrval : ⟪r⟫ = ⟪u⟫ * ⟪v⟫^3 * (⟪u⟫ * ⟪v⟫^7)^(2^252-3) := by
rw [hr, hfe2v, hfe4, hfe3v]
have hcheckv : ⟪check⟫ = ⟪v⟫ * ⟪r⟫^2 := by rw [hcheck, hfe5]; ring
have hcore := sqrt_core ⟪u⟫ ⟪v⟫ x hvne hx
rw [← hrval] at hcore
have hrpv : ⟪r_prime⟫ = ⟪im⟫ * ⟪r⟫ := hrp
-- denote transfer along the two selects
have hr1d : (flipped ||| flipped_i).val = 0 ∧ ⟪r1⟫ = ⟪r⟫
(flipped ||| flipped_i).val ≠ 0 ∧ ⟪r1⟫ = ⟪r_prime⟫ := by
split at hr1l
· left
refine ⟨by assumption, ?_⟩
unfold denote
rw [feVal_eq r1 rr0 rr1 rr2 rr3 rr4 (by rw [hr1l]),
feVal_eq r rr0 rr1 rr2 rr3 rr4 hrl]
· right
refine ⟨by assumption, ?_⟩
unfold denote
rw [feVal_eq r1 rp0 rp1 rp2 rp3 rp4 (by rw [hr1l]),
feVal_eq r_prime rp0 rp1 rp2 rp3 rp4 hrpl]
have hr2d : rneg.val = 0 ∧ ⟪r2⟫ = ⟪r1⟫ rneg.val ≠ 0 ∧ ⟪r2⟫ = ⟪r_neg⟫ := by
split at hr2l
· left
refine ⟨by assumption, ?_⟩
unfold denote
rw [feVal_eq r2 q0 q1 q2 q3 q4 (by rw [hr2l]),
feVal_eq r1 q0 q1 q2 q3 q4 hq]
· right
refine ⟨by assumption, ?_⟩
unfold denote
rw [feVal_eq r2 n0 n1 n2 n3 n4 (by rw [hr2l]),
feVal_eq r_neg n0 n1 n2 n3 n4 hnl]
-- ── choice values from the three checks ──────────────────────────────────
-- the value equation carried by r1 in every case: ⟪r1⟫²·⟪v⟫ = ⟪u⟫ and the
-- flip choice consistent with the branch taken
have hval1 : ⟪r1⟫ ^ 2 * ⟪v⟫ = ⟪u⟫ ∧ (correct ||| flipped).val = 1 := by
haveI : Fact (Nat.Prime P) := ⟨P_prime⟩
have hc01' := hc01
have hf01' := hf01
have hfi01' := hfi01
by_cases hu0 : ⟪u⟫ = 0
· -- u = 0: check = v·r² = ±0 = 0; every flag fires; r1 = im·r with r-part 0
have hchk0 : ⟪check⟫ = 0 := by
rcases hcore with h | h <;> rw [hcheckv]
· rw [show ⟪v⟫ * ⟪r⟫^2 = ⟪v⟫ * (⟪u⟫ * ⟪v⟫^3 * (⟪u⟫*⟪v⟫^7)^(2^252-3))^2 from by rw [hrval]]
rw [hrval] at h
rw [h, hu0]
· rw [hrval] at h ⊢
rw [h, hu0]
ring
have hr0 : ⟪v⟫ * ⟪r⟫^2 = 0 := by rw [← hcheckv]; exact hchk0
have hrz : ⟪r⟫ = 0 := by
rcases mul_eq_zero.mp hr0 with h | h
· exact absurd h hvne
· exact pow_eq_zero_iff (n := 2) (by norm_num) |>.mp h
have hcv : correct.val = 1 := hciff.mpr (by rw [hchk0, hu0])
have hor1 : (correct ||| flipped).val = 1 := by
rcases hf01 with h0 | h1
· have : flipped = 0#u8 := UScalar.eq_of_val_eq (by simp [h0])
rw [this]
have : correct = 1#u8 := UScalar.eq_of_val_eq (by simp [hcv])
rw [this]
rfl
· have : flipped = 1#u8 := UScalar.eq_of_val_eq (by simp [h1])
rw [this]
have : correct = 1#u8 := UScalar.eq_of_val_eq (by simp [hcv])
rw [this]
rfl
refine ⟨?_, hor1⟩
rcases hr1d with ⟨-, hd⟩ | ⟨-, hd⟩
· rw [hd, hrz, hu0]; ring
· rw [hd, hrpv, hrz, hu0]; ring
· -- u ≠ 0: the disjunct decides everything
rcases hcore with hA | hB
· -- v·r² = u: no flip, correct = 1
have hcv : correct.val = 1 := hciff.mpr (by rw [hcheckv]; exact hA)
have hfv : flipped.val = 0 := by
rcases hf01 with h | h
· exact h
· exfalso
have := hfiff.mp h
rw [hcheckv, hfe6] at this
rw [hA] at this
exact hu0 ((eq_neg_self_iff_zero ⟪u⟫).mp this)
have hfiv : flipped_i.val = 0 := by
rcases hfi01 with h | h
· exact h
· exfalso
have := hfiiff.mp h
rw [hcheckv, hfe7, hfe6] at this
rw [hA] at this
have hfac : ⟪u⟫ * (1 + ⟪im⟫) = 0 := by linear_combination this
rcases mul_eq_zero.mp hfac with h' | h'
· exact hu0 h'
· exact one_add_i_ne_zero (by rw [← sq]; rw [sq]; exact him) h'
have hflip0 : (flipped ||| flipped_i).val = 0 := by
have h1 : flipped = 0#u8 := UScalar.eq_of_val_eq (by simp [hfv])
have h2 : flipped_i = 0#u8 := UScalar.eq_of_val_eq (by simp [hfiv])
rw [h1, h2]
rfl
refine ⟨?_, ?_⟩
· rcases hr1d with ⟨-, hd⟩ | ⟨hne, -⟩
· rw [hd]; linear_combination hA
· exact absurd hflip0 hne
· have h1 : correct = 1#u8 := UScalar.eq_of_val_eq (by simp [hcv])
have h2 : flipped = 0#u8 := UScalar.eq_of_val_eq (by simp [hfv])
rw [h1, h2]
rfl
· -- v·r² = u: flip fires, r1 = im·r
have hfv : flipped.val = 1 := hfiff.mpr (by rw [hcheckv, hfe6]; exact hB)
have hflip1 : (flipped ||| flipped_i).val ≠ 0 := by
have h1 : flipped = 1#u8 := UScalar.eq_of_val_eq (by simp [hfv])
rw [h1]
rcases hfi01 with h | h
· have h2 : flipped_i = 0#u8 := UScalar.eq_of_val_eq (by simp [h])
rw [h2]
decide
· have h2 : flipped_i = 1#u8 := UScalar.eq_of_val_eq (by simp [h])
rw [h2]
decide
refine ⟨?_, ?_⟩
· rcases hr1d with ⟨h0, -⟩ | ⟨-, hd⟩
· exact absurd h0 hflip1
· rw [hd, hrpv]
have him2 : ⟪im⟫ ^ 2 = -1 := by rw [sq]; exact him
have : (⟪im⟫ * ⟪r⟫) ^ 2 * ⟪v⟫ = ⟪im⟫^2 * (⟪v⟫ * ⟪r⟫^2) := by ring
rw [this, him2, hB]
ring
· have h2 : flipped = 1#u8 := UScalar.eq_of_val_eq (by simp [hfv])
rw [h2]
rcases hc01 with h | h
· have h1 : correct = 0#u8 := UScalar.eq_of_val_eq (by simp [h])
rw [h1]
rfl
· have h1 : correct = 1#u8 := UScalar.eq_of_val_eq (by simp [h])
rw [h1]
rfl
obtain ⟨hval1', hwas⟩ := hval1
-- ── parity normalization and the final post ─────────────────────────────
haveI : NeZero P := ⟨by unfold P; norm_num⟩
have hrnegv : rneg.val = (⟪r1⟫).val % 2 := by
rw [hrneg]
unfold denote
rw [ZMod.val_natCast]
have hbr2 : Bnd r2 (2^52) := by
split at hr2l
· rw [Bnd_eq r2 q0 q1 q2 q3 q4 _ (by rw [hr2l])]
rw [Bnd_eq r1 q0 q1 q2 q3 q4 _ hq] at hbr1
exact hbr1
· have hb3 : Bnd r_neg (2^52) := hbrn
rw [Bnd_eq r2 n0 n1 n2 n3 n4 _ (by rw [hr2l])]
rw [Bnd_eq r_neg n0 n1 n2 n3 n4 _ hnl] at hb3
exact hb3
refine ⟨hwas, hbr2, ?_, ?_⟩
· -- the square equation survives the sign normalization
rcases hr2d with ⟨-, hd⟩ | ⟨-, hd⟩
· rw [hd]; exact hval1'
· rw [hd, hrn]
have : (-⟪r1⟫) ^ 2 * ⟪v⟫ = ⟪r1⟫ ^ 2 * ⟪v⟫ := by ring
rw [this]
exact hval1'
· -- even parity
rcases hr2d with ⟨h0, hd⟩ | ⟨hne, hd⟩
· rw [hd]
rw [hrnegv] at h0
exact h0
· rw [hd, hrn]
have hodd : rneg.val = 1 := by
have := hrnegv
omega
rw [hrnegv] at hodd
have hr1nz : ⟪r1⟫ ≠ 0 := by
intro hz
rw [hz] at hodd
simp at hodd
have hnegval : (-⟪r1⟫).val = P - (⟪r1⟫).val := by
rw [ZMod.neg_val, if_neg hr1nz]
rw [hnegval]
have hlt := ZMod.val_lt ⟪r1⟫
have hpodd : P % 2 = 1 := by unfold P; norm_num
have hpos : 0 < (⟪r1⟫).val := by
rcases Nat.eq_zero_or_pos (⟪r1⟫).val with h | h
· exact absurd ((ZMod.val_eq_zero _).mp h) hr1nz
· exact h
omega
end CurveFieldProofs

View file

@ -0,0 +1,439 @@
/- ──────────────────────────────────────────────────────────────────────────────
Proofs/FromBytesSpec.lean — phase 2, decompress step 2: the byte parser.
`FieldElement51::from_bytes` loads five 64-bit little-endian windows at
byte offsets 0/6/12/19/24, shifts by 0/3/6/1/12, and masks to 51 bits —
the windows tile bits 0..254 exactly, so
feVal (from_bytes b) = bytesVal b mod 2²⁵⁵ (from_bytes_spec)
— the top bit is discarded, everything else is exact. This is the y-parse
of decompression: for a canonical encoding (y-residue + sign bit), the
parsed field element denotes exactly the y-residue.
Port delta (risc0/betrusted v4 gen): from_bytes takes RangeFrom subslices
(`bytes[k..]`) and feeds them to a local `load8` CLOSURE with literal
indices 0..7, instead of dalek's named `load8_at s offset`. Same
disjoint-OR loader math; the walk adds a subslice step per window.
────────────────────────────────────────────────────────────────────────────── -/
import Proofs.DecompressSpec
open Aeneas Aeneas.Std Result
open curve25519_dalek
set_option maxHeartbeats 8000000
set_option linter.unusedSimpArgs false
set_option maxRecDepth 8000
namespace CurveFieldProofs
open Aeneas.Std.WP
/-- Disjoint low-bits OR is addition (product-order-robust form). -/
theorem or_add_low {a b : } (k : ) (ha : a < 2^k) :
a ||| b * 2^k = a + b * 2^k := by
have hor := Nat.two_pow_add_eq_or_of_lt (b := a) (i := k) ha b
calc a ||| b * 2^k = a ||| 2^k * b := by rw [Nat.mul_comm b]
_ = 2^k * b ||| a := Nat.lor_comm _ _
_ = 2^k * b + a := hor.symm
_ = a + b * 2^k := by ring
/-- RangeFrom slice indexing yields the tail slice (the `step_simps` set
already reduces the Array.index wrapper to this form). -/
theorem range_from_index_spec (s : Slice Std.U8)
(r : core.ops.range.RangeFrom Std.Usize) (h : r.start.val ≤ s.length) :
core.slice.index.SliceIndexRangeFromUsizeSlice.index r s ⦃ s' =>
s'.val = s.val.drop r.start.val ⦄ := by
simp only [core.slice.index.SliceIndexRangeFromUsizeSlice.index]
split
· simp [spec_ok, Slice.drop]
· scalar_tac
/-- Generic 8-byte little-endian loader (closure form): given the eight bytes
at positions 0..7 of the subslice, the loaded word is their LE value. -/
theorem closure_call_spec (c : backend.serial.u64.field.FieldElement51.from_bytes.closure)
(s : Slice Std.U8)
(c0 c1 c2 c3 c4 c5 c6 c7 : Std.U8)
(hlen : 7 < s.length)
(h0 : s.val[(0:)]! = c0) (h1 : s.val[(1:)]! = c1)
(h2 : s.val[(2:)]! = c2) (h3 : s.val[(3:)]! = c3)
(h4 : s.val[(4:)]! = c4) (h5 : s.val[(5:)]! = c5)
(h6 : s.val[(6:)]! = c6) (h7 : s.val[(7:)]! = c7) :
backend.serial.u64.field.FieldElement51.from_bytes.closure.Insts.CoreOpsFunctionFnTupleSharedSliceU8U64.call
c s ⦃ w =>
w.val = c0.val + c1.val * 2^8 + c2.val * 2^16 + c3.val * 2^24
+ c4.val * 2^32 + c5.val * 2^40 + c6.val * 2^48 + c7.val * 2^56 ⦄ := by
unfold backend.serial.u64.field.FieldElement51.from_bytes.closure.Insts.CoreOpsFunctionFnTupleSharedSliceU8U64.call
step as ⟨x0, hx0⟩
rw [← getElem!_pos (↑s : List Std.U8) 0 (by scalar_tac)] at hx0
rw [h0] at hx0
step as ⟨w0, hw0⟩
have hw0v : w0.val = c0.val := by
rw [hw0, UScalar.cast_val_eq, hx0]
norm_num [UScalarTy.numBits]
scalar_tac
step as ⟨x1, hx1⟩
rw [← getElem!_pos (↑s : List Std.U8) 1 (by scalar_tac)] at hx1
rw [h1] at hx1
step as ⟨y1, hy1⟩
have hy1v : y1.val = c1.val := by
rw [hy1, UScalar.cast_val_eq, hx1]
norm_num [UScalarTy.numBits]
scalar_tac
step as ⟨t1, ht1⟩
have ht1v : t1.val = c1.val * 2^8 := by
rw [ht1]
simp only [Nat.shiftLeft_eq, hy1v]
rw [Nat.mod_eq_of_lt (show c1.val * 2^8 < U64.size by scalar_tac)]
step as ⟨w1, hw1⟩
have hw1v : w1.val = c0.val + c1.val * 2^8 := by
rw [hw1, UScalar.val_or, hw0v, ht1v]
rw [or_add_low 8 (by scalar_tac)]
try ring
clear hx1 hy1 hy1v ht1 ht1v hw0 hw0v
step as ⟨x2, hx2⟩
rw [← getElem!_pos (↑s : List Std.U8) 2 (by scalar_tac)] at hx2
rw [h2] at hx2
step as ⟨y2, hy2⟩
have hy2v : y2.val = c2.val := by
rw [hy2, UScalar.cast_val_eq, hx2]
norm_num [UScalarTy.numBits]
scalar_tac
step as ⟨t2, ht2⟩
have ht2v : t2.val = c2.val * 2^16 := by
rw [ht2]
simp only [Nat.shiftLeft_eq, hy2v]
rw [Nat.mod_eq_of_lt (show c2.val * 2^16 < U64.size by scalar_tac)]
step as ⟨w2, hw2⟩
have hw2v : w2.val = c0.val + c1.val * 2^8 + c2.val * 2^16 := by
rw [hw2, UScalar.val_or, hw1v, ht2v]
rw [or_add_low 16 (by scalar_tac)]
try ring
clear hx2 hy2 hy2v ht2 ht2v hw1 hw1v
step as ⟨x3, hx3⟩
rw [← getElem!_pos (↑s : List Std.U8) 3 (by scalar_tac)] at hx3
rw [h3] at hx3
step as ⟨y3, hy3⟩
have hy3v : y3.val = c3.val := by
rw [hy3, UScalar.cast_val_eq, hx3]
norm_num [UScalarTy.numBits]
scalar_tac
step as ⟨t3, ht3⟩
have ht3v : t3.val = c3.val * 2^24 := by
rw [ht3]
simp only [Nat.shiftLeft_eq, hy3v]
rw [Nat.mod_eq_of_lt (show c3.val * 2^24 < U64.size by scalar_tac)]
step as ⟨w3, hw3⟩
have hw3v : w3.val = c0.val + c1.val * 2^8 + c2.val * 2^16 + c3.val * 2^24 := by
rw [hw3, UScalar.val_or, hw2v, ht3v]
rw [or_add_low 24 (by scalar_tac)]
try ring
clear hx3 hy3 hy3v ht3 ht3v hw2 hw2v
step as ⟨x4, hx4⟩
rw [← getElem!_pos (↑s : List Std.U8) 4 (by scalar_tac)] at hx4
rw [h4] at hx4
step as ⟨y4, hy4⟩
have hy4v : y4.val = c4.val := by
rw [hy4, UScalar.cast_val_eq, hx4]
norm_num [UScalarTy.numBits]
scalar_tac
step as ⟨t4, ht4⟩
have ht4v : t4.val = c4.val * 2^32 := by
rw [ht4]
simp only [Nat.shiftLeft_eq, hy4v]
rw [Nat.mod_eq_of_lt (show c4.val * 2^32 < U64.size by scalar_tac)]
step as ⟨w4, hw4⟩
have hw4v : w4.val = c0.val + c1.val * 2^8 + c2.val * 2^16 + c3.val * 2^24 + c4.val * 2^32 := by
rw [hw4, UScalar.val_or, hw3v, ht4v]
rw [or_add_low 32 (by scalar_tac)]
try ring
clear hx4 hy4 hy4v ht4 ht4v hw3 hw3v
step as ⟨x5, hx5⟩
rw [← getElem!_pos (↑s : List Std.U8) 5 (by scalar_tac)] at hx5
rw [h5] at hx5
step as ⟨y5, hy5⟩
have hy5v : y5.val = c5.val := by
rw [hy5, UScalar.cast_val_eq, hx5]
norm_num [UScalarTy.numBits]
scalar_tac
step as ⟨t5, ht5⟩
have ht5v : t5.val = c5.val * 2^40 := by
rw [ht5]
simp only [Nat.shiftLeft_eq, hy5v]
rw [Nat.mod_eq_of_lt (show c5.val * 2^40 < U64.size by scalar_tac)]
step as ⟨w5, hw5⟩
have hw5v : w5.val = c0.val + c1.val * 2^8 + c2.val * 2^16 + c3.val * 2^24 + c4.val * 2^32 + c5.val * 2^40 := by
rw [hw5, UScalar.val_or, hw4v, ht5v]
rw [or_add_low 40 (by scalar_tac)]
try ring
clear hx5 hy5 hy5v ht5 ht5v hw4 hw4v
step as ⟨x6, hx6⟩
rw [← getElem!_pos (↑s : List Std.U8) 6 (by scalar_tac)] at hx6
rw [h6] at hx6
step as ⟨y6, hy6⟩
have hy6v : y6.val = c6.val := by
rw [hy6, UScalar.cast_val_eq, hx6]
norm_num [UScalarTy.numBits]
scalar_tac
step as ⟨t6, ht6⟩
have ht6v : t6.val = c6.val * 2^48 := by
rw [ht6]
simp only [Nat.shiftLeft_eq, hy6v]
rw [Nat.mod_eq_of_lt (show c6.val * 2^48 < U64.size by scalar_tac)]
step as ⟨w6, hw6⟩
have hw6v : w6.val = c0.val + c1.val * 2^8 + c2.val * 2^16 + c3.val * 2^24 + c4.val * 2^32 + c5.val * 2^40 + c6.val * 2^48 := by
rw [hw6, UScalar.val_or, hw5v, ht6v]
rw [or_add_low 48 (by scalar_tac)]
try ring
clear hx6 hy6 hy6v ht6 ht6v hw5 hw5v
step as ⟨x7, hx7⟩
rw [← getElem!_pos (↑s : List Std.U8) 7 (by scalar_tac)] at hx7
rw [h7] at hx7
step as ⟨y7, hy7⟩
have hy7v : y7.val = c7.val := by
rw [hy7, UScalar.cast_val_eq, hx7]
norm_num [UScalarTy.numBits]
scalar_tac
step as ⟨t7, ht7⟩
have ht7v : t7.val = c7.val * 2^56 := by
rw [ht7]
simp only [Nat.shiftLeft_eq, hy7v]
rw [Nat.mod_eq_of_lt (show c7.val * 2^56 < U64.size by scalar_tac)]
try simp only [spec_ok]
rw [UScalar.val_or, hw6v, ht7v]
rw [or_add_low 56 (by scalar_tac)]
try ring
/-- Extract a 64-bit window: with the value decomposed as low + 2^m·window
+ 2^m·2^64·high (window < 2^64, low < 2^m), division and mod recover the
window. -/
theorem window_extract (Lo M H : ) (m : ) (hL : Lo < 2^m) (hM : M < 2^64) :
(Lo + 2^m * M + 2^m * 2^64 * H) / 2^m % 2^64 = M := by
have h1 : (Lo + 2^m * M + 2^m * 2^64 * H) / 2^m = M + 2^64 * H := by
rw [show Lo + 2^m * M + 2^m * 2^64 * H = Lo + 2^m * (M + 2^64 * H) by ring]
rw [Nat.add_mul_div_left _ _ (Nat.two_pow_pos m), Nat.div_eq_of_lt hL]
omega
rw [h1]
omega
/-- Shift inside a 64-bit window: for sh + 51 ≤ 64,
((B/2^(8o)) mod 2^64 / 2^sh) mod 2^51 = (B / 2^(8o+sh)) mod 2^51. -/
theorem window_shift (B o sh : ) (hsh : sh + 51 ≤ 64) :
(B / 2^(8*o) % 2^64 / 2^sh) % 2^51 = B / 2^(8*o + sh) % 2^51 := by
have h1 : B / 2^(8*o) % 2^64 / 2^sh = B / 2^(8*o) / 2^sh % 2^(64 - sh) := by
have hsplit : (2:)^64 = 2^sh * 2^(64 - sh) := by
rw [← pow_add]
congr 1
omega
rw [hsplit, Nat.mod_mul_right_div_self]
rw [h1, Nat.div_div_eq_div_mul, ← pow_add]
have h2 : B / 2^(8*o + sh) % 2^(64 - sh) % 2^51 = B / 2^(8*o + sh) % 2^51 := by
apply Nat.mod_mod_of_dvd
exact pow_dvd_pow 2 (by omega)
rw [h2]
/-- Base-2⁵¹ five-digit tiling: the masked digits reassemble the value
mod 2²⁵⁵. -/
theorem digits_tile (B : ) :
B % 2^51
+ (B / 2^51 % 2^51) * 2^51
+ (B / 2^102 % 2^51) * 2^102
+ (B / 2^153 % 2^51) * 2^153
+ (B / 2^204 % 2^51) * 2^204 = B % 2^255 := by
have e1 : B / 2^51 / 2^51 = B / 2^102 := by rw [Nat.div_div_eq_div_mul]; norm_num
have e2 : B / 2^102 / 2^51 = B / 2^153 := by rw [Nat.div_div_eq_div_mul]; norm_num
have e3 : B / 2^153 / 2^51 = B / 2^204 := by rw [Nat.div_div_eq_div_mul]; norm_num
have e4 : B / 2^204 / 2^51 = B / 2^255 := by rw [Nat.div_div_eq_div_mul]; norm_num
have d0 := Nat.div_add_mod B (2^51)
have d1 := Nat.div_add_mod (B / 2^51) (2^51)
have d2 := Nat.div_add_mod (B / 2^102) (2^51)
have d3 := Nat.div_add_mod (B / 2^153) (2^51)
have d4 := Nat.div_add_mod (B / 2^204) (2^51)
have dT := Nat.div_add_mod B (2^255)
omega
/-- **The byte parser is exact below bit 255**: for any 32 input bytes,
`from_bytes` succeeds with 51-bit limbs denoting `bytesVal b mod 2²⁵⁵`
(the sign bit is discarded, the rest is the little-endian value). -/
theorem from_bytes_spec (bytes : Std.Array Std.U8 32#usize)
(b0 b1 b2 b3 b4 b5 b6 b7 b8 b9 b10 b11 b12 b13 b14 b15 b16 b17 b18 b19 b20 b21 b22 b23 b24 b25 b26 b27 b28 b29 b30 b31 : Std.U8)
(hbl : (↑bytes : List Std.U8) = [b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, b12, b13, b14, b15, b16, b17, b18, b19, b20, b21, b22, b23, b24, b25, b26, b27, b28, b29, b30, b31]) :
backend.serial.u64.field.FieldElement51.from_bytes bytes ⦃ r =>
Bnd r (2^51) ∧ feVal r = bytesVal bytes % 2^255 ⦄ := by
unfold backend.serial.u64.field.FieldElement51.from_bytes
step as ⟨msk0, hmsk0⟩
step as ⟨mask, hmask⟩
have hmaskv : mask.val = 2251799813685247 := by
rw [hmask, hmsk0]
simp [Nat.shiftLeft_eq]
scalar_tac
-- window 0: bytes 0..7, shift 0
step with (range_from_index_spec bytes.to_slice { start := 0#usize } (by scalar_tac))
as ⟨s0, hs0v⟩
step with (closure_call_spec () s0 b0 b1 b2 b3 b4 b5 b6 b7
(by rw [Slice.length]; simp [hs0v, hbl, Array.to_slice])
(by simp [hs0v, hbl, Array.to_slice])
(by simp [hs0v, hbl, Array.to_slice])
(by simp [hs0v, hbl, Array.to_slice])
(by simp [hs0v, hbl, Array.to_slice])
(by simp [hs0v, hbl, Array.to_slice])
(by simp [hs0v, hbl, Array.to_slice])
(by simp [hs0v, hbl, Array.to_slice])
(by simp [hs0v, hbl, Array.to_slice])
) as ⟨w0, hw0⟩
step as ⟨l0, hl0⟩
have hl0v : l0.val = w0.val % 2^51 := by
rw [hl0, UScalar.val_and, hmaskv, nat_and_mask]
norm_num
-- window 1: bytes 6..13, shift 3
step with (range_from_index_spec bytes.to_slice { start := 6#usize } (by scalar_tac))
as ⟨s1, hs1v⟩
step with (closure_call_spec () s1 b6 b7 b8 b9 b10 b11 b12 b13
(by rw [Slice.length]; simp [hs1v, hbl, Array.to_slice])
(by simp [hs1v, hbl, Array.to_slice])
(by simp [hs1v, hbl, Array.to_slice])
(by simp [hs1v, hbl, Array.to_slice])
(by simp [hs1v, hbl, Array.to_slice])
(by simp [hs1v, hbl, Array.to_slice])
(by simp [hs1v, hbl, Array.to_slice])
(by simp [hs1v, hbl, Array.to_slice])
(by simp [hs1v, hbl, Array.to_slice])
) as ⟨w1, hw1⟩
step as ⟨sh1, hsh1⟩
step as ⟨l1, hl1⟩
have hl1v : l1.val = (w1.val / 2^3) % 2^51 := by
rw [hl1, UScalar.val_and, hmaskv, nat_and_mask, hsh1, nat_shr]
norm_num
-- window 2: bytes 12..19, shift 6
step with (range_from_index_spec bytes.to_slice { start := 12#usize } (by scalar_tac))
as ⟨s2, hs2v⟩
step with (closure_call_spec () s2 b12 b13 b14 b15 b16 b17 b18 b19
(by rw [Slice.length]; simp [hs2v, hbl, Array.to_slice])
(by simp [hs2v, hbl, Array.to_slice])
(by simp [hs2v, hbl, Array.to_slice])
(by simp [hs2v, hbl, Array.to_slice])
(by simp [hs2v, hbl, Array.to_slice])
(by simp [hs2v, hbl, Array.to_slice])
(by simp [hs2v, hbl, Array.to_slice])
(by simp [hs2v, hbl, Array.to_slice])
(by simp [hs2v, hbl, Array.to_slice])
) as ⟨w2, hw2⟩
step as ⟨sh2, hsh2⟩
step as ⟨l2, hl2⟩
have hl2v : l2.val = (w2.val / 2^6) % 2^51 := by
rw [hl2, UScalar.val_and, hmaskv, nat_and_mask, hsh2, nat_shr]
norm_num
-- window 3: bytes 19..26, shift 1
step with (range_from_index_spec bytes.to_slice { start := 19#usize } (by scalar_tac))
as ⟨s3, hs3v⟩
step with (closure_call_spec () s3 b19 b20 b21 b22 b23 b24 b25 b26
(by rw [Slice.length]; simp [hs3v, hbl, Array.to_slice])
(by simp [hs3v, hbl, Array.to_slice])
(by simp [hs3v, hbl, Array.to_slice])
(by simp [hs3v, hbl, Array.to_slice])
(by simp [hs3v, hbl, Array.to_slice])
(by simp [hs3v, hbl, Array.to_slice])
(by simp [hs3v, hbl, Array.to_slice])
(by simp [hs3v, hbl, Array.to_slice])
(by simp [hs3v, hbl, Array.to_slice])
) as ⟨w3, hw3⟩
step as ⟨sh3, hsh3⟩
step as ⟨l3, hl3⟩
have hl3v : l3.val = (w3.val / 2^1) % 2^51 := by
rw [hl3, UScalar.val_and, hmaskv, nat_and_mask, hsh3, nat_shr]
norm_num
-- window 4: bytes 24..31, shift 12
step with (range_from_index_spec bytes.to_slice { start := 24#usize } (by scalar_tac))
as ⟨s4, hs4v⟩
step with (closure_call_spec () s4 b24 b25 b26 b27 b28 b29 b30 b31
(by rw [Slice.length]; simp [hs4v, hbl, Array.to_slice])
(by simp [hs4v, hbl, Array.to_slice])
(by simp [hs4v, hbl, Array.to_slice])
(by simp [hs4v, hbl, Array.to_slice])
(by simp [hs4v, hbl, Array.to_slice])
(by simp [hs4v, hbl, Array.to_slice])
(by simp [hs4v, hbl, Array.to_slice])
(by simp [hs4v, hbl, Array.to_slice])
(by simp [hs4v, hbl, Array.to_slice])
) as ⟨w4, hw4⟩
step as ⟨sh4, hsh4⟩
step as ⟨l4, hl4⟩
have hl4v : l4.val = (w4.val / 2^12) % 2^51 := by
rw [hl4, UScalar.val_and, hmaskv, nat_and_mask, hsh4, nat_shr]
norm_num
try simp only [spec_ok]
constructor
· rw [Bnd_eq _ l0 l1 l2 l3 l4 _ rfl]
refine ⟨?_, ?_, ?_, ?_, ?_⟩ <;> · first
| (rw [hl0v]; exact Nat.mod_lt _ (by norm_num))
| (rw [hl1v]; exact Nat.mod_lt _ (by norm_num))
| (rw [hl2v]; exact Nat.mod_lt _ (by norm_num))
| (rw [hl3v]; exact Nat.mod_lt _ (by norm_num))
| (rw [hl4v]; exact Nat.mod_lt _ (by norm_num))
· rw [feVal_eq _ l0 l1 l2 l3 l4 rfl]
unfold limbsVal
have hB : bytesVal bytes = b0.val + b1.val * 2^8 + b2.val * 2^16 + b3.val * 2^24 + b4.val * 2^32 + b5.val * 2^40 + b6.val * 2^48 + b7.val * 2^56 + b8.val * 2^64 + b9.val * 2^72 + b10.val * 2^80 + b11.val * 2^88 + b12.val * 2^96 + b13.val * 2^104 + b14.val * 2^112 + b15.val * 2^120 + b16.val * 2^128 + b17.val * 2^136 + b18.val * 2^144 + b19.val * 2^152 + b20.val * 2^160 + b21.val * 2^168 + b22.val * 2^176 + b23.val * 2^184 + b24.val * 2^192 + b25.val * 2^200 + b26.val * 2^208 + b27.val * 2^216 + b28.val * 2^224 + b29.val * 2^232 + b30.val * 2^240 + b31.val * 2^248 := by
simp only [bytesVal, hbl]
have hwin0 : w0.val = bytesVal bytes / 2^0 % 2^64 := by
have hdecomp : (b0.val + b1.val * 2^8 + b2.val * 2^16 + b3.val * 2^24 + b4.val * 2^32 + b5.val * 2^40 + b6.val * 2^48 + b7.val * 2^56 + b8.val * 2^64 + b9.val * 2^72 + b10.val * 2^80 + b11.val * 2^88 + b12.val * 2^96 + b13.val * 2^104 + b14.val * 2^112 + b15.val * 2^120 + b16.val * 2^128 + b17.val * 2^136 + b18.val * 2^144 + b19.val * 2^152 + b20.val * 2^160 + b21.val * 2^168 + b22.val * 2^176 + b23.val * 2^184 + b24.val * 2^192 + b25.val * 2^200 + b26.val * 2^208 + b27.val * 2^216 + b28.val * 2^224 + b29.val * 2^232 + b30.val * 2^240 + b31.val * 2^248)
= (0) + 2^0 * (b0.val + b1.val * 2^8 + b2.val * 2^16 + b3.val * 2^24 + b4.val * 2^32 + b5.val * 2^40 + b6.val * 2^48 + b7.val * 2^56) + 2^0 * 2^64 * (b8.val + b9.val * 2^8 + b10.val * 2^16 + b11.val * 2^24 + b12.val * 2^32 + b13.val * 2^40 + b14.val * 2^48 + b15.val * 2^56 + b16.val * 2^64 + b17.val * 2^72 + b18.val * 2^80 + b19.val * 2^88 + b20.val * 2^96 + b21.val * 2^104 + b22.val * 2^112 + b23.val * 2^120 + b24.val * 2^128 + b25.val * 2^136 + b26.val * 2^144 + b27.val * 2^152 + b28.val * 2^160 + b29.val * 2^168 + b30.val * 2^176 + b31.val * 2^184) := by
ring
rw [hw0, hB, hdecomp]
exact (window_extract (0) (b0.val + b1.val * 2^8 + b2.val * 2^16 + b3.val * 2^24 + b4.val * 2^32 + b5.val * 2^40 + b6.val * 2^48 + b7.val * 2^56) (b8.val + b9.val * 2^8 + b10.val * 2^16 + b11.val * 2^24 + b12.val * 2^32 + b13.val * 2^40 + b14.val * 2^48 + b15.val * 2^56 + b16.val * 2^64 + b17.val * 2^72 + b18.val * 2^80 + b19.val * 2^88 + b20.val * 2^96 + b21.val * 2^104 + b22.val * 2^112 + b23.val * 2^120 + b24.val * 2^128 + b25.val * 2^136 + b26.val * 2^144 + b27.val * 2^152 + b28.val * 2^160 + b29.val * 2^168 + b30.val * 2^176 + b31.val * 2^184) 0
(by scalar_tac) (by scalar_tac)).symm
have hlimb0 : l0.val = bytesVal bytes / 2^0 % 2^51 := by
rw [hl0v, hwin0]
exact Nat.mod_mod_of_dvd _ (pow_dvd_pow 2 (by norm_num))
have hwin1 : w1.val = bytesVal bytes / 2^48 % 2^64 := by
have hdecomp : (b0.val + b1.val * 2^8 + b2.val * 2^16 + b3.val * 2^24 + b4.val * 2^32 + b5.val * 2^40 + b6.val * 2^48 + b7.val * 2^56 + b8.val * 2^64 + b9.val * 2^72 + b10.val * 2^80 + b11.val * 2^88 + b12.val * 2^96 + b13.val * 2^104 + b14.val * 2^112 + b15.val * 2^120 + b16.val * 2^128 + b17.val * 2^136 + b18.val * 2^144 + b19.val * 2^152 + b20.val * 2^160 + b21.val * 2^168 + b22.val * 2^176 + b23.val * 2^184 + b24.val * 2^192 + b25.val * 2^200 + b26.val * 2^208 + b27.val * 2^216 + b28.val * 2^224 + b29.val * 2^232 + b30.val * 2^240 + b31.val * 2^248)
= (b0.val + b1.val * 2^8 + b2.val * 2^16 + b3.val * 2^24 + b4.val * 2^32 + b5.val * 2^40) + 2^48 * (b6.val + b7.val * 2^8 + b8.val * 2^16 + b9.val * 2^24 + b10.val * 2^32 + b11.val * 2^40 + b12.val * 2^48 + b13.val * 2^56) + 2^48 * 2^64 * (b14.val + b15.val * 2^8 + b16.val * 2^16 + b17.val * 2^24 + b18.val * 2^32 + b19.val * 2^40 + b20.val * 2^48 + b21.val * 2^56 + b22.val * 2^64 + b23.val * 2^72 + b24.val * 2^80 + b25.val * 2^88 + b26.val * 2^96 + b27.val * 2^104 + b28.val * 2^112 + b29.val * 2^120 + b30.val * 2^128 + b31.val * 2^136) := by
ring
rw [hw1, hB, hdecomp]
exact (window_extract (b0.val + b1.val * 2^8 + b2.val * 2^16 + b3.val * 2^24 + b4.val * 2^32 + b5.val * 2^40) (b6.val + b7.val * 2^8 + b8.val * 2^16 + b9.val * 2^24 + b10.val * 2^32 + b11.val * 2^40 + b12.val * 2^48 + b13.val * 2^56) (b14.val + b15.val * 2^8 + b16.val * 2^16 + b17.val * 2^24 + b18.val * 2^32 + b19.val * 2^40 + b20.val * 2^48 + b21.val * 2^56 + b22.val * 2^64 + b23.val * 2^72 + b24.val * 2^80 + b25.val * 2^88 + b26.val * 2^96 + b27.val * 2^104 + b28.val * 2^112 + b29.val * 2^120 + b30.val * 2^128 + b31.val * 2^136) 48
(by scalar_tac) (by scalar_tac)).symm
have hlimb1 : l1.val = bytesVal bytes / 2^51 % 2^51 := by
rw [hl1v, hwin1]
have := window_shift (bytesVal bytes) 6 3 (by norm_num)
norm_num at this ⊢
rw [this]
have hwin2 : w2.val = bytesVal bytes / 2^96 % 2^64 := by
have hdecomp : (b0.val + b1.val * 2^8 + b2.val * 2^16 + b3.val * 2^24 + b4.val * 2^32 + b5.val * 2^40 + b6.val * 2^48 + b7.val * 2^56 + b8.val * 2^64 + b9.val * 2^72 + b10.val * 2^80 + b11.val * 2^88 + b12.val * 2^96 + b13.val * 2^104 + b14.val * 2^112 + b15.val * 2^120 + b16.val * 2^128 + b17.val * 2^136 + b18.val * 2^144 + b19.val * 2^152 + b20.val * 2^160 + b21.val * 2^168 + b22.val * 2^176 + b23.val * 2^184 + b24.val * 2^192 + b25.val * 2^200 + b26.val * 2^208 + b27.val * 2^216 + b28.val * 2^224 + b29.val * 2^232 + b30.val * 2^240 + b31.val * 2^248)
= (b0.val + b1.val * 2^8 + b2.val * 2^16 + b3.val * 2^24 + b4.val * 2^32 + b5.val * 2^40 + b6.val * 2^48 + b7.val * 2^56 + b8.val * 2^64 + b9.val * 2^72 + b10.val * 2^80 + b11.val * 2^88) + 2^96 * (b12.val + b13.val * 2^8 + b14.val * 2^16 + b15.val * 2^24 + b16.val * 2^32 + b17.val * 2^40 + b18.val * 2^48 + b19.val * 2^56) + 2^96 * 2^64 * (b20.val + b21.val * 2^8 + b22.val * 2^16 + b23.val * 2^24 + b24.val * 2^32 + b25.val * 2^40 + b26.val * 2^48 + b27.val * 2^56 + b28.val * 2^64 + b29.val * 2^72 + b30.val * 2^80 + b31.val * 2^88) := by
ring
rw [hw2, hB, hdecomp]
exact (window_extract (b0.val + b1.val * 2^8 + b2.val * 2^16 + b3.val * 2^24 + b4.val * 2^32 + b5.val * 2^40 + b6.val * 2^48 + b7.val * 2^56 + b8.val * 2^64 + b9.val * 2^72 + b10.val * 2^80 + b11.val * 2^88) (b12.val + b13.val * 2^8 + b14.val * 2^16 + b15.val * 2^24 + b16.val * 2^32 + b17.val * 2^40 + b18.val * 2^48 + b19.val * 2^56) (b20.val + b21.val * 2^8 + b22.val * 2^16 + b23.val * 2^24 + b24.val * 2^32 + b25.val * 2^40 + b26.val * 2^48 + b27.val * 2^56 + b28.val * 2^64 + b29.val * 2^72 + b30.val * 2^80 + b31.val * 2^88) 96
(by scalar_tac) (by scalar_tac)).symm
have hlimb2 : l2.val = bytesVal bytes / 2^102 % 2^51 := by
rw [hl2v, hwin2]
have := window_shift (bytesVal bytes) 12 6 (by norm_num)
norm_num at this ⊢
rw [this]
have hwin3 : w3.val = bytesVal bytes / 2^152 % 2^64 := by
have hdecomp : (b0.val + b1.val * 2^8 + b2.val * 2^16 + b3.val * 2^24 + b4.val * 2^32 + b5.val * 2^40 + b6.val * 2^48 + b7.val * 2^56 + b8.val * 2^64 + b9.val * 2^72 + b10.val * 2^80 + b11.val * 2^88 + b12.val * 2^96 + b13.val * 2^104 + b14.val * 2^112 + b15.val * 2^120 + b16.val * 2^128 + b17.val * 2^136 + b18.val * 2^144 + b19.val * 2^152 + b20.val * 2^160 + b21.val * 2^168 + b22.val * 2^176 + b23.val * 2^184 + b24.val * 2^192 + b25.val * 2^200 + b26.val * 2^208 + b27.val * 2^216 + b28.val * 2^224 + b29.val * 2^232 + b30.val * 2^240 + b31.val * 2^248)
= (b0.val + b1.val * 2^8 + b2.val * 2^16 + b3.val * 2^24 + b4.val * 2^32 + b5.val * 2^40 + b6.val * 2^48 + b7.val * 2^56 + b8.val * 2^64 + b9.val * 2^72 + b10.val * 2^80 + b11.val * 2^88 + b12.val * 2^96 + b13.val * 2^104 + b14.val * 2^112 + b15.val * 2^120 + b16.val * 2^128 + b17.val * 2^136 + b18.val * 2^144) + 2^152 * (b19.val + b20.val * 2^8 + b21.val * 2^16 + b22.val * 2^24 + b23.val * 2^32 + b24.val * 2^40 + b25.val * 2^48 + b26.val * 2^56) + 2^152 * 2^64 * (b27.val + b28.val * 2^8 + b29.val * 2^16 + b30.val * 2^24 + b31.val * 2^32) := by
ring
rw [hw3, hB, hdecomp]
exact (window_extract (b0.val + b1.val * 2^8 + b2.val * 2^16 + b3.val * 2^24 + b4.val * 2^32 + b5.val * 2^40 + b6.val * 2^48 + b7.val * 2^56 + b8.val * 2^64 + b9.val * 2^72 + b10.val * 2^80 + b11.val * 2^88 + b12.val * 2^96 + b13.val * 2^104 + b14.val * 2^112 + b15.val * 2^120 + b16.val * 2^128 + b17.val * 2^136 + b18.val * 2^144) (b19.val + b20.val * 2^8 + b21.val * 2^16 + b22.val * 2^24 + b23.val * 2^32 + b24.val * 2^40 + b25.val * 2^48 + b26.val * 2^56) (b27.val + b28.val * 2^8 + b29.val * 2^16 + b30.val * 2^24 + b31.val * 2^32) 152
(by scalar_tac) (by scalar_tac)).symm
have hlimb3 : l3.val = bytesVal bytes / 2^153 % 2^51 := by
rw [hl3v, hwin3]
have := window_shift (bytesVal bytes) 19 1 (by norm_num)
norm_num at this ⊢
rw [this]
have hwin4 : w4.val = bytesVal bytes / 2^192 % 2^64 := by
have hdecomp : (b0.val + b1.val * 2^8 + b2.val * 2^16 + b3.val * 2^24 + b4.val * 2^32 + b5.val * 2^40 + b6.val * 2^48 + b7.val * 2^56 + b8.val * 2^64 + b9.val * 2^72 + b10.val * 2^80 + b11.val * 2^88 + b12.val * 2^96 + b13.val * 2^104 + b14.val * 2^112 + b15.val * 2^120 + b16.val * 2^128 + b17.val * 2^136 + b18.val * 2^144 + b19.val * 2^152 + b20.val * 2^160 + b21.val * 2^168 + b22.val * 2^176 + b23.val * 2^184 + b24.val * 2^192 + b25.val * 2^200 + b26.val * 2^208 + b27.val * 2^216 + b28.val * 2^224 + b29.val * 2^232 + b30.val * 2^240 + b31.val * 2^248)
= (b0.val + b1.val * 2^8 + b2.val * 2^16 + b3.val * 2^24 + b4.val * 2^32 + b5.val * 2^40 + b6.val * 2^48 + b7.val * 2^56 + b8.val * 2^64 + b9.val * 2^72 + b10.val * 2^80 + b11.val * 2^88 + b12.val * 2^96 + b13.val * 2^104 + b14.val * 2^112 + b15.val * 2^120 + b16.val * 2^128 + b17.val * 2^136 + b18.val * 2^144 + b19.val * 2^152 + b20.val * 2^160 + b21.val * 2^168 + b22.val * 2^176 + b23.val * 2^184) + 2^192 * (b24.val + b25.val * 2^8 + b26.val * 2^16 + b27.val * 2^24 + b28.val * 2^32 + b29.val * 2^40 + b30.val * 2^48 + b31.val * 2^56) + 2^192 * 2^64 * 0 := by
ring
rw [hw4, hB, hdecomp]
exact (window_extract (b0.val + b1.val * 2^8 + b2.val * 2^16 + b3.val * 2^24 + b4.val * 2^32 + b5.val * 2^40 + b6.val * 2^48 + b7.val * 2^56 + b8.val * 2^64 + b9.val * 2^72 + b10.val * 2^80 + b11.val * 2^88 + b12.val * 2^96 + b13.val * 2^104 + b14.val * 2^112 + b15.val * 2^120 + b16.val * 2^128 + b17.val * 2^136 + b18.val * 2^144 + b19.val * 2^152 + b20.val * 2^160 + b21.val * 2^168 + b22.val * 2^176 + b23.val * 2^184) (b24.val + b25.val * 2^8 + b26.val * 2^16 + b27.val * 2^24 + b28.val * 2^32 + b29.val * 2^40 + b30.val * 2^48 + b31.val * 2^56) 0 192
(by scalar_tac) (by scalar_tac)).symm
have hlimb4 : l4.val = bytesVal bytes / 2^204 % 2^51 := by
rw [hl4v, hwin4]
have := window_shift (bytesVal bytes) 24 12 (by norm_num)
norm_num at this ⊢
rw [this]
have ht := digits_tile (bytesVal bytes)
norm_num at ht hlimb0 hlimb1 hlimb2 hlimb3 hlimb4 ⊢
omega
end CurveFieldProofs

View file

@ -70,6 +70,9 @@ PROOFS=(
SigApexSpec SigApexSpec
PointLiftSpec PointLiftSpec
PointEqSpec PointEqSpec
DecompressSpec
FromBytesSpec
DecompressMain
) )
# Fully-qualified certificate names; each must be axiom-clean. # Fully-qualified certificate names; each must be axiom-clean.
CERTS=( CERTS=(
@ -94,6 +97,12 @@ CERTS=(
ScalarProofs.from_bytes_mod_order_wide_spec ScalarProofs.from_bytes_mod_order_wide_spec
CurveFieldProofs.vartime_dsm_basepoint_spec CurveFieldProofs.vartime_dsm_basepoint_spec
CurveFieldProofs.enc_point_inj CurveFieldProofs.enc_point_inj
CurveFieldProofs.pow_p58_spec
CurveFieldProofs.fe_ct_eq_spec
CurveFieldProofs.sqrt_core
CurveFieldProofs.sqrt_ratio_i_sq_spec
CurveFieldProofs.from_bytes_spec
CurveFieldProofs.decompress_of_canonical
) )
# Imports needed so every certificate in CERTS is in scope for the audit. # Imports needed so every certificate in CERTS is in scope for the audit.
AUDIT_IMPORTS=( AUDIT_IMPORTS=(
@ -110,6 +119,9 @@ AUDIT_IMPORTS=(
Proofs.ScalarPackSpec Proofs.ScalarPackSpec
Proofs.PointLiftSpec Proofs.PointLiftSpec
Proofs.PointEqSpec Proofs.PointEqSpec
Proofs.DecompressSpec
Proofs.FromBytesSpec
Proofs.DecompressMain
) )
# ── Phase 0: resource + integrity guards ──────────────────────────────────── # ── Phase 0: resource + integrity guards ────────────────────────────────────
@ -201,15 +213,16 @@ lake env bash -c "
cd '$HERE' cd '$HERE'
ALLOWED='[propext, Classical.choice, Quot.sound, ed25519.Signature, verifying.sha512_hash3, ed25519.Signature.to_bytes, signature.error.Error, signature.error.Error.new]' ALLOWED='[propext, Classical.choice, Quot.sound, ed25519.Signature, verifying.sha512_hash3, ed25519.Signature.to_bytes, signature.error.Error, signature.error.Error.new]'
AUD=\$(mktemp '$HERE/.apex-XXXX.lean') AUD=\$(mktemp '$HERE/.apex-XXXX.lean')
{ echo 'import Proofs.SigApexSpec'; echo 'import Proofs.PointLiftSpec'; echo 'import Proofs.PointEqSpec'; echo '#print axioms CurveFieldProofs.verify_accepts_iff'; echo '#print axioms CurveFieldProofs.verify_accepts_iff_point'; echo '#print axioms CurveFieldProofs.verify_accepts_iff_point_eq'; } > \"\$AUD\" { echo 'import Proofs.SigApexSpec'; echo 'import Proofs.PointLiftSpec'; echo 'import Proofs.PointEqSpec'; echo 'import Proofs.DecompressMain'; echo '#print axioms CurveFieldProofs.verify_accepts_iff'; echo '#print axioms CurveFieldProofs.verify_accepts_iff_point'; echo '#print axioms CurveFieldProofs.verify_accepts_iff_point_eq'; echo '#print axioms CurveFieldProofs.verify_accepts_iff_decompress'; } > \"\$AUD\"
OUT=\$(LEAN_TIMEOUT=$TIMEOUT LEAN_MEM_MB=4096 '$HERE/lean-guard' \"\$AUD\" 2>&1) OUT=\$(LEAN_TIMEOUT=$TIMEOUT LEAN_MEM_MB=4096 '$HERE/lean-guard' \"\$AUD\" 2>&1)
echo \"\$OUT\" echo \"\$OUT\"
rm -f \"\$AUD\" rm -f \"\$AUD\"
FLAT=\$(echo \"\$OUT\" | tr '\\n' ' ' | tr -s ' ') FLAT=\$(echo \"\$OUT\" | tr '\\n' ' ' | tr -s ' ')
if echo \"\$FLAT\" | grep -qF \"'CurveFieldProofs.verify_accepts_iff' depends on axioms: \$ALLOWED\" \ if echo \"\$FLAT\" | grep -qF \"'CurveFieldProofs.verify_accepts_iff' depends on axioms: \$ALLOWED\" \
&& echo \"\$FLAT\" | grep -qF \"'CurveFieldProofs.verify_accepts_iff_point' depends on axioms: \$ALLOWED\" \ && echo \"\$FLAT\" | grep -qF \"'CurveFieldProofs.verify_accepts_iff_point' depends on axioms: \$ALLOWED\" \
&& echo \"\$FLAT\" | grep -qF \"'CurveFieldProofs.verify_accepts_iff_point_eq' depends on axioms: \$ALLOWED\"; then && echo \"\$FLAT\" | grep -qF \"'CurveFieldProofs.verify_accepts_iff_point_eq' depends on axioms: \$ALLOWED\" \
echo ' apex axiom cone = exactly the SHA-512 + wire-format boundary (no curve/scalar/backend axioms)' && echo \"\$FLAT\" | grep -qF \"'CurveFieldProofs.verify_accepts_iff_decompress' depends on axioms: \$ALLOWED\"; then
echo ' apex + full-lift axiom cones = exactly the SHA-512 + wire-format boundary (no curve/scalar/backend axioms)'
else else
echo 'APEX AUDIT FAILED: verify_accepts_iff cone is not the documented boundary'; exit 1 echo 'APEX AUDIT FAILED: verify_accepts_iff cone is not the documented boundary'; exit 1
fi fi

View file

@ -5,9 +5,11 @@
# roots: crate::field, crate::backend::serial::u64::field, # roots: crate::field, crate::backend::serial::u64::field,
# crate::backend::serial::curve_models, crate::edwards # crate::backend::serial::curve_models, crate::edwards
# (same widening the reference solution used for its Tier-1 addition-law # (same widening the reference solution used for its Tier-1 addition-law
# theorem; scalar-mul backends and decompress internals stay opaque — # theorem; scalar-mul backends stay opaque — upstream Aeneas cannot
# upstream Aeneas cannot translate them; they are modeled/axiomatized in # translate them; they are modeled/axiomatized in
# gen/CurveField/FunsExternal.lean OUTSIDE every certificate's cone). # gen/CurveField/FunsExternal.lean OUTSIDE every certificate's cone.
# decompress IS extracted since the phase-2 full lift — the source's
# step_2 uses the documented negate-then-conditional-assign rewrite).
# #
# Rust --charon--> CurveField.llbc --aeneas--> gen/CurveField/*.lean # Rust --charon--> CurveField.llbc --aeneas--> gen/CurveField/*.lean
# #
@ -54,7 +56,6 @@ charon cargo --preset=aeneas \
--opaque 'crate::backend::serial::scalar_mul::pippenger' \ --opaque 'crate::backend::serial::scalar_mul::pippenger' \
--opaque 'crate::backend::vector' \ --opaque 'crate::backend::vector' \
--opaque 'crate::backend::get_selected_backend' \ --opaque 'crate::backend::get_selected_backend' \
--opaque 'crate::edwards::decompress' \
--opaque 'crate::edwards::_::sum' \ --opaque 'crate::edwards::_::sum' \
--opaque 'crate::edwards::_::from_slice' \ --opaque 'crate::edwards::_::from_slice' \
--dest-file "$HERE/CurveField.llbc" \ --dest-file "$HERE/CurveField.llbc" \

File diff suppressed because it is too large Load diff

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@ -269,25 +269,8 @@ axiom
(backend.serial.curve_models.AffineNielsPoint × (backend.serial.curve_models.AffineNielsPoint ×
backend.serial.curve_models.AffineNielsPoint) backend.serial.curve_models.AffineNielsPoint)
/-- [curve25519_dalek::edwards::decompress::step_2]:
Source: 'curve25519-dalek/src/edwards.rs', lines 223:4-240:5 -/
axiom edwards.decompress.step_2
:
edwards.CompressedEdwardsY → backend.serial.u64.field.FieldElement51 →
backend.serial.u64.field.FieldElement51 →
backend.serial.u64.field.FieldElement51 → Result edwards.EdwardsPoint
/-- [curve25519_dalek::edwards::decompress::step_1]:
Source: 'curve25519-dalek/src/edwards.rs', lines 209:4-220:5 -/
axiom edwards.decompress.step_1
:
edwards.CompressedEdwardsY → Result (subtle.Choice ×
backend.serial.u64.field.FieldElement51 ×
backend.serial.u64.field.FieldElement51 ×
backend.serial.u64.field.FieldElement51)
/-- [curve25519_dalek::edwards::{curve25519_dalek::edwards::CompressedEdwardsY}::from_slice]: /-- [curve25519_dalek::edwards::{curve25519_dalek::edwards::CompressedEdwardsY}::from_slice]:
Source: 'curve25519-dalek/src/edwards.rs', lines 404:4-406:5 Source: 'curve25519-dalek/src/edwards.rs', lines 409:4-411:5
Visibility: public -/ Visibility: public -/
axiom edwards.CompressedEdwardsY.from_slice axiom edwards.CompressedEdwardsY.from_slice
: :
@ -295,7 +278,7 @@ axiom edwards.CompressedEdwardsY.from_slice
core.array.TryFromSliceError) core.array.TryFromSliceError)
/-- [curve25519_dalek::edwards::{impl subtle::ConditionallySelectable for curve25519_dalek::edwards::EdwardsPoint}::conditional_swap]: /-- [curve25519_dalek::edwards::{impl subtle::ConditionallySelectable for curve25519_dalek::edwards::EdwardsPoint}::conditional_swap]:
Source: 'curve25519-dalek/src/edwards.rs', lines 467:0-476:1 Source: 'curve25519-dalek/src/edwards.rs', lines 472:0-481:1
Visibility: public -/ Visibility: public -/
axiom edwards.EdwardsPoint.Insts.SubtleConditionallySelectable.conditional_swap axiom edwards.EdwardsPoint.Insts.SubtleConditionallySelectable.conditional_swap
: :
@ -303,7 +286,7 @@ axiom edwards.EdwardsPoint.Insts.SubtleConditionallySelectable.conditional_swap
(edwards.EdwardsPoint × edwards.EdwardsPoint) (edwards.EdwardsPoint × edwards.EdwardsPoint)
/-- [curve25519_dalek::edwards::{impl subtle::ConditionallySelectable for curve25519_dalek::edwards::EdwardsPoint}::conditional_assign]: /-- [curve25519_dalek::edwards::{impl subtle::ConditionallySelectable for curve25519_dalek::edwards::EdwardsPoint}::conditional_assign]:
Source: 'curve25519-dalek/src/edwards.rs', lines 467:0-476:1 Source: 'curve25519-dalek/src/edwards.rs', lines 472:0-481:1
Visibility: public -/ Visibility: public -/
axiom axiom
edwards.EdwardsPoint.Insts.SubtleConditionallySelectable.conditional_assign edwards.EdwardsPoint.Insts.SubtleConditionallySelectable.conditional_assign
@ -312,13 +295,13 @@ axiom
edwards.EdwardsPoint edwards.EdwardsPoint
/-- [curve25519_dalek::edwards::{impl core::cmp::Eq for curve25519_dalek::edwards::EdwardsPoint}::assert_fields_are_eq]: /-- [curve25519_dalek::edwards::{impl core::cmp::Eq for curve25519_dalek::edwards::EdwardsPoint}::assert_fields_are_eq]:
Source: 'curve25519-dalek/src/edwards.rs', lines 501:0-501:27 Source: 'curve25519-dalek/src/edwards.rs', lines 506:0-506:27
Visibility: public -/ Visibility: public -/
axiom edwards.EdwardsPoint.Insts.CoreCmpEq.assert_fields_are_eq axiom edwards.EdwardsPoint.Insts.CoreCmpEq.assert_fields_are_eq
: edwards.EdwardsPoint → Result Unit : edwards.EdwardsPoint → Result Unit
/-- [curve25519_dalek::edwards::{impl core::iter::traits::accum::Sum<T> for curve25519_dalek::edwards::EdwardsPoint}::sum]: /-- [curve25519_dalek::edwards::{impl core::iter::traits::accum::Sum<T> for curve25519_dalek::edwards::EdwardsPoint}::sum]:
Source: 'curve25519-dalek/src/edwards.rs', lines 671:4-676:5 Source: 'curve25519-dalek/src/edwards.rs', lines 676:4-681:5
Visibility: public -/ Visibility: public -/
axiom edwards.EdwardsPoint.Insts.CoreIterTraitsAccumSum.sum axiom edwards.EdwardsPoint.Insts.CoreIterTraitsAccumSum.sum
{T : Type} {I : Type} (coreborrowBorrowTEdwardsPointInst : core.borrow.Borrow {T : Type} {I : Type} (coreborrowBorrowTEdwardsPointInst : core.borrow.Borrow

View file

@ -128,7 +128,7 @@ structure scalar.Scalar where
def backend.serial.u64.field.FieldElement51 := Array Std.U64 5#usize def backend.serial.u64.field.FieldElement51 := Array Std.U64 5#usize
/-- [curve25519_dalek::edwards::EdwardsPoint] /-- [curve25519_dalek::edwards::EdwardsPoint]
Source: 'curve25519-dalek/src/edwards.rs', lines 371:0-376:1 Source: 'curve25519-dalek/src/edwards.rs', lines 376:0-381:1
Visibility: public -/ Visibility: public -/
structure edwards.EdwardsPoint where structure edwards.EdwardsPoint where
X : backend.serial.u64.field.FieldElement51 X : backend.serial.u64.field.FieldElement51
@ -198,7 +198,7 @@ def backend.serial.u64.scalar.Scalar52 := Array Std.U64 5#usize
def backend.serial.u64.field.FieldElement51.from_bytes.closure := Unit def backend.serial.u64.field.FieldElement51.from_bytes.closure := Unit
/-- [curve25519_dalek::edwards::CompressedEdwardsY] /-- [curve25519_dalek::edwards::CompressedEdwardsY]
Source: 'curve25519-dalek/src/edwards.rs', lines 165:0-165:44 Source: 'curve25519-dalek/src/edwards.rs', lines 164:0-164:44
Visibility: public -/ Visibility: public -/
@[reducible] @[reducible]
def edwards.CompressedEdwardsY := Array Std.U8 32#usize def edwards.CompressedEdwardsY := Array Std.U8 32#usize

View file

@ -39,7 +39,7 @@ axiom
F) F)
/-- [curve25519_dalek::edwards::{curve25519_dalek::edwards::CompressedEdwardsY}::as_bytes]: /-- [curve25519_dalek::edwards::{curve25519_dalek::edwards::CompressedEdwardsY}::as_bytes]:
Source: 'curve25519-dalek/src/edwards.rs', lines 181:4-181:45 Source: 'curve25519-dalek/src/edwards.rs', lines 180:4-180:45
Name pattern: [curve25519_dalek::edwards::{curve25519_dalek::edwards::CompressedEdwardsY}::as_bytes] Name pattern: [curve25519_dalek::edwards::{curve25519_dalek::edwards::CompressedEdwardsY}::as_bytes]
Visibility: public -/ Visibility: public -/
@[rust_fun @[rust_fun
@ -50,7 +50,7 @@ axiom curve25519_dalek.edwards.CompressedEdwardsY.as_bytes
32#usize) 32#usize)
/-- [curve25519_dalek::edwards::{curve25519_dalek::edwards::EdwardsPoint}::compress]: /-- [curve25519_dalek::edwards::{curve25519_dalek::edwards::EdwardsPoint}::compress]:
Source: 'curve25519-dalek/src/edwards.rs', lines 566:4-566:48 Source: 'curve25519-dalek/src/edwards.rs', lines 571:4-571:48
Name pattern: [curve25519_dalek::edwards::{curve25519_dalek::edwards::EdwardsPoint}::compress] Name pattern: [curve25519_dalek::edwards::{curve25519_dalek::edwards::EdwardsPoint}::compress]
Visibility: public -/ Visibility: public -/
@[rust_fun @[rust_fun
@ -61,7 +61,7 @@ axiom curve25519_dalek.edwards.EdwardsPoint.compress
curve25519_dalek.edwards.CompressedEdwardsY curve25519_dalek.edwards.CompressedEdwardsY
/-- [curve25519_dalek::edwards::{impl core::ops::arith::Neg<curve25519_dalek::edwards::EdwardsPoint> for curve25519_dalek::edwards::EdwardsPoint}::neg]: /-- [curve25519_dalek::edwards::{impl core::ops::arith::Neg<curve25519_dalek::edwards::EdwardsPoint> for curve25519_dalek::edwards::EdwardsPoint}::neg]:
Source: 'curve25519-dalek/src/edwards.rs', lines 699:4-699:32 Source: 'curve25519-dalek/src/edwards.rs', lines 704:4-704:32
Name pattern: [curve25519_dalek::edwards::{core::ops::arith::Neg<curve25519_dalek::edwards::EdwardsPoint, curve25519_dalek::edwards::EdwardsPoint>}::neg] Name pattern: [curve25519_dalek::edwards::{core::ops::arith::Neg<curve25519_dalek::edwards::EdwardsPoint, curve25519_dalek::edwards::EdwardsPoint>}::neg]
Visibility: public -/ Visibility: public -/
@[rust_fun @[rust_fun
@ -73,7 +73,7 @@ axiom
curve25519_dalek.edwards.EdwardsPoint curve25519_dalek.edwards.EdwardsPoint
/-- [curve25519_dalek::edwards::{curve25519_dalek::edwards::EdwardsPoint}::vartime_double_scalar_mul_basepoint]: /-- [curve25519_dalek::edwards::{curve25519_dalek::edwards::EdwardsPoint}::vartime_double_scalar_mul_basepoint]:
Source: 'curve25519-dalek/src/edwards.rs', lines 902:4-906:21 Source: 'curve25519-dalek/src/edwards.rs', lines 907:4-911:21
Name pattern: [curve25519_dalek::edwards::{curve25519_dalek::edwards::EdwardsPoint}::vartime_double_scalar_mul_basepoint] Name pattern: [curve25519_dalek::edwards::{curve25519_dalek::edwards::EdwardsPoint}::vartime_double_scalar_mul_basepoint]
Visibility: public -/ Visibility: public -/
@[rust_fun @[rust_fun

View file

@ -14,14 +14,14 @@ set_option maxHeartbeats 1000000
set_option maxRecDepth 2048 set_option maxRecDepth 2048
/-- [curve25519_dalek::edwards::CompressedEdwardsY] /-- [curve25519_dalek::edwards::CompressedEdwardsY]
Source: 'curve25519-dalek/src/edwards.rs', lines 165:0-165:29 Source: 'curve25519-dalek/src/edwards.rs', lines 164:0-164:29
Name pattern: [curve25519_dalek::edwards::CompressedEdwardsY] Name pattern: [curve25519_dalek::edwards::CompressedEdwardsY]
Visibility: public -/ Visibility: public -/
@[rust_type "curve25519_dalek::edwards::CompressedEdwardsY"] @[rust_type "curve25519_dalek::edwards::CompressedEdwardsY"]
axiom curve25519_dalek.edwards.CompressedEdwardsY : Type axiom curve25519_dalek.edwards.CompressedEdwardsY : Type
/-- [curve25519_dalek::edwards::EdwardsPoint] /-- [curve25519_dalek::edwards::EdwardsPoint]
Source: 'curve25519-dalek/src/edwards.rs', lines 371:0-371:23 Source: 'curve25519-dalek/src/edwards.rs', lines 376:0-376:23
Name pattern: [curve25519_dalek::edwards::EdwardsPoint] Name pattern: [curve25519_dalek::edwards::EdwardsPoint]
Visibility: public -/ Visibility: public -/
@[rust_type "curve25519_dalek::edwards::EdwardsPoint"] @[rust_type "curve25519_dalek::edwards::EdwardsPoint"]