You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
122 lines
3.3 KiB
122 lines
3.3 KiB
/*
|
|
Copyright 2018 0KIMS association.
|
|
|
|
This file is part of circom (Zero Knowledge Circuit Compiler).
|
|
|
|
circom is a free software: you can redistribute it and/or modify it
|
|
under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
circom is distributed in the hope that it will be useful, but WITHOUT
|
|
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
|
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
|
|
License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with circom. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
include "compconstant.circom";
|
|
include "poseidon.circom";
|
|
include "bitify.circom";
|
|
include "escalarmulany.circom";
|
|
include "escalarmulfix.circom";
|
|
|
|
template EdDSAPoseidonVerifier() {
|
|
signal input enabled;
|
|
signal input Ax;
|
|
signal input Ay;
|
|
|
|
signal input S;
|
|
signal input R8x;
|
|
signal input R8y;
|
|
|
|
signal input M;
|
|
|
|
var i;
|
|
|
|
// Ensure S<Subgroup Order
|
|
|
|
component snum2bits = Num2Bits(253);
|
|
snum2bits.in <== S;
|
|
|
|
component compConstant = CompConstant(2736030358979909402780800718157159386076813972158567259200215660948447373040);
|
|
|
|
for (i=0; i<253; i++) {
|
|
snum2bits.out[i] ==> compConstant.in[i];
|
|
}
|
|
compConstant.in[253] <== 0;
|
|
compConstant.out === 0;
|
|
|
|
// Calculate the h = H(R,A, msg)
|
|
|
|
component hash = Poseidon(5, 6, 8, 57);
|
|
|
|
hash.inputs[0] <== R8x;
|
|
hash.inputs[1] <== R8y;
|
|
hash.inputs[2] <== Ax;
|
|
hash.inputs[3] <== Ay;
|
|
hash.inputs[4] <== M;
|
|
|
|
component h2bits = Num2Bits_strict();
|
|
h2bits.in <== hash.out;
|
|
|
|
// Calculate second part of the right side: right2 = h*8*A
|
|
|
|
// Multiply by 8 by adding it 3 times. This also ensure that the result is in
|
|
// the subgroup.
|
|
component dbl1 = BabyDbl();
|
|
dbl1.x <== Ax;
|
|
dbl1.y <== Ay;
|
|
component dbl2 = BabyDbl();
|
|
dbl2.x <== dbl1.xout;
|
|
dbl2.y <== dbl1.yout;
|
|
component dbl3 = BabyDbl();
|
|
dbl3.x <== dbl2.xout;
|
|
dbl3.y <== dbl2.yout;
|
|
|
|
// We check that A is not zero.
|
|
component isZero = IsZero();
|
|
isZero.in <== dbl3.x;
|
|
isZero.out === 0;
|
|
|
|
component mulAny = EscalarMulAny(254);
|
|
for (i=0; i<254; i++) {
|
|
mulAny.e[i] <== h2bits.out[i];
|
|
}
|
|
mulAny.p[0] <== dbl3.xout;
|
|
mulAny.p[1] <== dbl3.yout;
|
|
|
|
|
|
// Compute the right side: right = R8 + right2
|
|
|
|
component addRight = BabyAdd();
|
|
addRight.x1 <== R8x;
|
|
addRight.y1 <== R8y;
|
|
addRight.x2 <== mulAny.out[0];
|
|
addRight.y2 <== mulAny.out[1];
|
|
|
|
// Calculate left side of equation left = S*B8
|
|
|
|
var BASE8 = [
|
|
17777552123799933955779906779655732241715742912184938656739573121738514868268,
|
|
2626589144620713026669568689430873010625803728049924121243784502389097019475
|
|
];
|
|
component mulFix = EscalarMulFix(253, BASE8);
|
|
for (i=0; i<253; i++) {
|
|
mulFix.e[i] <== snum2bits.out[i];
|
|
}
|
|
|
|
// Do the comparation left == right if enabled;
|
|
|
|
component eqCheckX = ForceEqualIfEnabled();
|
|
eqCheckX.enabled <== enabled;
|
|
eqCheckX.in[0] <== mulFix.out[0];
|
|
eqCheckX.in[1] <== addRight.xout;
|
|
|
|
component eqCheckY = ForceEqualIfEnabled();
|
|
eqCheckY.enabled <== enabled;
|
|
eqCheckY.in[0] <== mulFix.out[1];
|
|
eqCheckY.in[1] <== addRight.yout;
|
|
}
|