arnaucube/gnark-plonky2-verifier
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get signature working

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This commit is contained in:
Jacob Jackson
2022-10-07 06:19:24 +00:00
parent d61e54c60e
commit 52dade9335
3 changed files with 205 additions and 101 deletions
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20
edwards_curve/eddsa25519.go
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@@ -4,7 +4,6 @@ package edwards_curve
// This file is little-endian
import (
"fmt"
"math/big"
"github.com/consensys/gnark/frontend"
"github.com/consensys/gnark/std/math/emulated"
@@ -13,10 +12,8 @@ import (
func H(api frontend.API, m []frontend.Variable) []frontend.Variable {
fmt.Println("sha input", m)
rawResult := sha512.Sha512(api, swapByteEndianness(m))
sResult := swapByteEndianness(rawResult[:])
fmt.Println("sha output", sResult)
return sResult
}
@@ -36,10 +33,10 @@ func bits_to_scalar(c *EdCurve, s []frontend.Variable) EdCoordinate {
elt := emulated.NewElement[Ed25519](0)
if len(elt.Limbs) != 4 { panic("bad length") }
i := 0
elt.Limbs[0] = c.api.FromBinary(s[i:i+64]...); i += 64
elt.Limbs[1] = c.api.FromBinary(s[i:i+64]...); i += 64
elt.Limbs[2] = c.api.FromBinary(s[i:i+64]...); i += 64
elt.Limbs[3] = c.api.FromBinary(s[i:i+64]...); i += 64
for k := 0; k < 4; k++ {
elt.Limbs[k] = c.api.FromBinary(s[i:i+64]...)
i += 64
}
if i != len(s) { panic("bad length") }
return elt
}
@@ -83,13 +80,8 @@ func CheckValid(c *EdCurve, s, m, pk []frontend.Variable) {
R := bits_to_element(c, s[:256])
A := bits_to_element(c, pk)
h := H(c.api, concat(s[:256], pk, m))
fmt.Println("h", h)
fmt.Println("g", dbg(c.g.X), dbg(c.g.Y))
fmt.Println("s last half", s[256:])
v1 := c.ScalarMulBinary(c.g, s[256:])
fmt.Println("v1", dbg(v1.X), dbg(v1.Y))
v2 := c.Add(R, c.ScalarMulBinary(A, h))
fmt.Println("v2", dbg(v2.X), dbg(v2.Y))
c.AssertIsEqual(v1, v2)
}
@@ -152,10 +144,6 @@ func toValue(s EdCoordinate) *big.Int {
return result
}
func dbg(s EdCoordinate) string {
return toValue(s).Text(16)
}
func _const(x int64) EdCoordinate {
return emulated.NewElement[Ed25519](big.NewInt(x))
}