tornado-packages/circomlib
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Support mutiply by point 0 in scalarmulany

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Jordi Baylina 2019-09-05 17:10:20 +02:00
parent ebbeaebc73
commit 024188b638
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GPG Key ID: 7480C80C1BE43112
2 changed files with 11 additions and 7 deletions
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16
circuits/escalarmulany.circom
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@ -19,6 +19,7 @@
include "montgomery.circom"; include "montgomery.circom";
include "babyjub.circom"; include "babyjub.circom";
include "comparators.circom";
template Multiplexor2() { template Multiplexor2() {
signal input sel; signal input sel;
@ -138,6 +139,8 @@ template EscalarMulAny(n) {
component doublers[nsegments-1]; component doublers[nsegments-1];
component m2e[nsegments-1]; component m2e[nsegments-1];
component adders[nsegments-1]; component adders[nsegments-1];
component zeropoint = IsZero();
zeropoint.in <== p[0];
var s; var s;
var i; var i;
@ -154,8 +157,9 @@ template EscalarMulAny(n) {
} }
if (s==0) { if (s==0) {
p[0] ==> segments[s].p[0]; // force G8 point if input point is zero
p[1] ==> segments[s].p[1]; segments[s].p[0] <== p[0] + (5299619240641551281634865583518297030282874472190772894086521144482721001553 - p[0])*zeropoint.out;
segments[s].p[1] <== p[1] + (16950150798460657717958625567821834550301663161624707787222815936182638968203 - p[1])*zeropoint.out;
} else { } else {
doublers[s-1] = MontgomeryDouble(); doublers[s-1] = MontgomeryDouble();
m2e[s-1] = Montgomery2Edwards(); m2e[s-1] = Montgomery2Edwards();
@ -183,10 +187,10 @@ template EscalarMulAny(n) {
} }
if (nsegments == 1) { if (nsegments == 1) {
segments[0].out[0] ==> out[0]; segments[0].out[0]*(1-zeropoint.out) ==> out[0];
segments[0].out[1] ==> out[1]; segments[0].out[1]+(1-segments[0].out[1])*zeropoint.out ==> out[1];
} else { } else {
adders[nsegments-2].xout ==> out[0]; adders[nsegments-2].xout*(1-zeropoint.out) ==> out[0];
adders[nsegments-2].yout ==> out[1]; adders[nsegments-2].yout+(1-adders[nsegments-2].yout)*zeropoint.out ==> out[1];
} }
} }

2
circuits/escalarmulfix.circom
View File

@ -246,7 +246,7 @@ template EscalarMulFix(n, BASE) {
var s; var s;
var i; var i;
var nseg; var nseg;
var nWindows var nWindows;
for (s=0; s<nsegments; s++) { for (s=0; s<nsegments; s++) {