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refactor(poseidon-cipher): simplify nonce validation using Num2Bits #19

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Jan 22, 2025
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refactor(poseidon-cipher): simplify nonce validation using Num2Bits #19

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11 changes: 4 additions & 7 deletions packages/poseidon-cipher/src/poseidon-cipher.circom
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@ include "poseidon-constants-old.circom";
// we import this for util functions like Ark, Mix, Sigma
include "poseidon_old.circom";
include "comparators.circom";
include "bitify.circom";

// Poseidon decryption circuit
// param length: length of the input
Expand Down Expand Up @@ -107,13 +108,9 @@ template PoseidonDecryptIterations(length) {
signal output decrypted[decryptedLength];
signal output decryptedLast;

var two128 = 2 ** 128;

// nonce must be < 2^128
component lt = LessThan(252);
lt.in[0] <== nonce;
lt.in[1] <== two128;
lt.out === 1;
component n2b = Num2Bits(128);
n2b.in <== nonce;
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// calculate the number of iterations
// needed for the decryption
Expand All @@ -133,7 +130,7 @@ template PoseidonDecryptIterations(length) {
strategies[0].inputs[0] <== 0;
strategies[0].inputs[1] <== key[0];
strategies[0].inputs[2] <== key[1];
strategies[0].inputs[3] <== nonce + (length * two128);
strategies[0].inputs[3] <== nonce + (length << 128);

// loop for n iterations
for (var i = 0; i < n; i++) {
Expand Down
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