logos-storage/nim-groth16
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allow the user to set the masking coefficients and the toxic waste (useful for debugging purposes)

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Balazs Komuves 2024-01-16 12:37:27 +01:00
parent fbe637e8d4
commit 42e1728629
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4 changed files with 32 additions and 12 deletions
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8
groth16.nim
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@ -1,6 +1,12 @@
import groth16/bn128/types
import groth16/bn128
import groth16/files/zkey
import groth16/files/witness
import groth16/prover
import groth16/verifier
export bn128
export zkey
export witness
export prover
export verifier

2
groth16.nimble
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@ -6,4 +6,4 @@ license = "MIT OR Apache-2.0"
skipDirs = @["groth16/example"]
binDir = "build"
requires "https://github.com/mratsim/constantine"
requires "https://github.com/mratsim/constantine#5f7ba18f2ed351260015397c9eae079a6decaee1"

14
groth16/fake_setup.nim
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@ -20,14 +20,14 @@ import groth16/misc
#-------------------------------------------------------------------------------
type
ToxicWaste = object
alpha: Fr
beta: Fr
gamma: Fr
delta: Fr
tau: Fr
ToxicWaste* = object
alpha*: Fr
beta*: Fr
gamma*: Fr
delta*: Fr
tau*: Fr
proc randomToxicWaste(): ToxicWaste =
proc randomToxicWaste*(): ToxicWaste =
let a = randFr()
let b = randFr()
let c = randFr()

20
groth16/prover.nim
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@ -149,7 +149,12 @@ func computeSnarkjsScalarCoeffs( abc: ABC ): seq[Fr] =
# the prover
#
proc generateProof*( zkey: ZKey, wtns: Witness ): Proof =
type
Mask* = object
r*: Fr # masking coefficients
s*: Fr # for zero knowledge
proc generateProofWithMask*( zkey: ZKey, wtns: Witness, mask: Mask ): Proof =
assert( zkey.header.curve == wtns.curve )
let witness = wtns.values
@ -186,8 +191,8 @@ proc generateProof*( zkey: ZKey, wtns: Witness ): Proof =
zs[j-npubs-1] = witness[j]
# masking coeffs
let r : Fr = randFr()
let s : Fr = randFr()
let r = mask.r
let s = mask.s
var pi_a : G1
pi_a = spec.alpha1
@ -214,3 +219,12 @@ proc generateProof*( zkey: ZKey, wtns: Witness ): Proof =
return Proof( curve:"bn128", publicIO:pubIO, pi_a:pi_a, pi_b:pi_b, pi_c:pi_c )
#-------------------------------------------------------------------------------
proc generateProof*( zkey: ZKey, wtns: Witness ): Proof =
# masking coeffs
let r : Fr = randFr()
let s : Fr = randFr()
let mask = Mask(r: r, s: s)
return generateProofWithMask( zkey, wtns, mask )