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feat(circom): fully constrain is_valid_merkle_branch_out. #172

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merged 3 commits into from
Jun 29, 2023
Merged

feat(circom): fully constrain is_valid_merkle_branch_out. #172

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904f6dc
feat(circom): fully constraint is_valid_merkle_branch_out
stefan-nikolov96 Jun 27, 2023
8faa323
feat(circom): Add additional test for pow template
stefan-nikolov96 Jun 28, 2023
51d937c
fix(circom): Constrain index remainder by idx2Bits
stefan-nikolov96 Jun 29, 2023
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9 changes: 7 additions & 2 deletions beacon-light-client/circom/circuits/is_valid_merkle_branch_out.circom
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,10 @@ pragma circom 2.1.5;

include "hash_two.circom";
include "../../../node_modules/circomlib/circuits/comparators.circom";
include "../../../node_modules/circomlib/circuits/bitify.circom";

include "utils/arrays.circom";
include "utils/numerical.circom";

template IsValidMerkleBranchOut(N) {
signal input branch[N][256];
Expand All @@ -14,12 +17,14 @@ template IsValidMerkleBranchOut(N) {

component hashers[N];
component isZero[N];

component idx2Bits;
idx2Bits = Num2Bits(N+1);
idx2Bits.in <== index;
for(var i = 0; i < N; i++) {
hashers[i] = HashTwo();
isZero[i] = IsZero();

isZero[i].in <-- (index \ (2**i)) % 2;
isZero[i].in <== idx2Bits.out[i];

var current[256];

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4 changes: 4 additions & 0 deletions beacon-light-client/circom/test/pow/data/case05/input.json
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@@ -0,0 +1,4 @@
{
"base": "10",
"power": "0"
}
3 changes: 3 additions & 0 deletions beacon-light-client/circom/test/pow/data/case05/output.json
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@@ -0,0 +1,3 @@
{
"out": "1"
}