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use blst_p1_add_or_double instead of blst_p1_add

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blst exposes two add functions: one that works for the corner case
of doubling, and one that isn't. It seems safer to use the one that
works, even if it is highly improbable in these cases that doubling
would occur.

Signed-off-by: Csaba Kiraly <csaba.kiraly@gmail.com>
This commit is contained in:
Csaba Kiraly 2021-09-27 10:15:00 +02:00 committed by Dmitriy Ryajov
parent 6ff0031293
commit 355d0d2ab8
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GPG Key ID: DA8C680CE7C657A4
1 changed files with 11 additions and 8 deletions
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19
dagger/storageproofs/bls.nim
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@ -185,9 +185,9 @@ proc generateAuthenticatorNaive(i: int64, s: int64, t: TauZero, ubase: openArray
for j in 0 ..< s:
var prod: blst_p1
prod.blst_p1_mult(t.u[j], fromBytesBE(getSector(f, i, j, s)), 255)
sum.blst_p1_add(sum, prod)
sum.blst_p1_add_or_double(sum, prod)
blst_p1_add(result, hashNameI(t.name, i), sum)
blst_p1_add_or_double(result, hashNameI(t.name, i), sum)
result.blst_p1_mult(result, ssk.key, 255)
proc generateAuthenticatorOpt(i: int64, s: int64, t: TauZero, ubase: openArray[blst_scalar], f: File, ssk: SecretKey): blst_p1 =
@ -205,11 +205,14 @@ proc generateAuthenticatorOpt(i: int64, s: int64, t: TauZero, ubase: openArray[b
result.blst_p1_from_affine(BLS12_381_G1)
result.blst_p1_mult(result, sums, 255)
result.blst_p1_add(result, hashNameI(t.name, i))
result.blst_p1_add_or_double(result, hashNameI(t.name, i))
result.blst_p1_mult(result, ssk.key, 255)
proc generateAuthenticator(i: int64, s: int64, t: TauZero, ubase: openArray[blst_scalar], f: File, ssk: SecretKey): blst_p1 =
generateAuthenticatorOpt(i, s, t, ubase, f, ssk)
# let a = generateAuthenticatorNaive(i, s, t, ubase, f, ssk)
let b = generateAuthenticatorOpt(i, s, t, ubase, f, ssk)
# doAssert(a.blst_p1_is_equal(b).bool)
return b
proc st*(ssk: SecretKey, filename: string): (Tau, seq[blst_p1]) =
let file = open(filename)
@ -279,7 +282,7 @@ proc generateProof*(q: openArray[QElement], authenticators: openArray[blst_p1],
for qelem in q:
var prod: blst_p1
prod.blst_p1_mult(authenticators[qelem.I], qelem.V, 255)
sigma.blst_p1_add(sigma, prod)
sigma.blst_p1_add_or_double(sigma, prod)
file.close()
return (mu, sigma)
@ -329,7 +332,7 @@ proc verifyProof*(tau: Tau, q: openArray[QElement], mus: openArray[blst_scalar],
for qelem in q :
var prod: blst_p1
prod.blst_p1_mult(hashNameI(tau.t.name, qelem.I), qelem.V, 255)
first.blst_p1_add(first, prod)
first.blst_p1_add_or_double(first, prod)
doAssert(blst_p1_on_curve(first).bool)
let us = tau.t.u
@ -337,11 +340,11 @@ proc verifyProof*(tau: Tau, q: openArray[QElement], mus: openArray[blst_scalar],
for j in 0 ..< len(us) :
var prod: blst_p1
prod.blst_p1_mult(us[j], mus[j], 255)
second.blst_p1_add(second, prod)
second.blst_p1_add_or_double(second, prod)
doAssert(blst_p1_on_curve(second).bool)
var sum: blst_p1
sum.blst_p1_add(first, second)
sum.blst_p1_add_or_double(first, second)
var g{.noInit.}: blst_p2
g.blst_p2_from_affine(BLS12_381_G2)