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fix decode base64 bug #1

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fix decode base64 bug #1

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20 changes: 5 additions & 15 deletions circuits/jwt.circom
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,7 @@ include "./jwt_type_regex.circom";
include "./ascii.circom";
include "./timestamp.circom";

template JWTVerify(max_msg_bytes, max_json_bytes, n, k) {
template JWTVerify(max_msg_bytes, max_body_bytes,max_json_bytes, n, k) {
signal input message[max_msg_bytes];
signal input modulus[k]; // rsa pubkey
signal input signature[k];
Expand Down Expand Up @@ -66,21 +66,11 @@ template JWTVerify(max_msg_bytes, max_json_bytes, n, k) {

// decode to JSON format
component message_b64 = Base64Decode(max_json_bytes);
component eqs[max_msg_bytes];
signal int[max_msg_bytes];
signal body[max_body_bytes] <== VarShiftLeft(max_msg_bytes, max_body_bytes)(message, period_idx + 1);

for (var i = 0; i < max_msg_bytes - 1; i++) {
eqs[i] = GreaterEqThan(15);
eqs[i].in[0] <== i;
eqs[i].in[1] <== period_idx;

var i_plus_one = eqs[i].out;
var i_normal = 1 - eqs[i].out;

int[i] <== (message[i] * i_normal);
message_b64.in[i] <== (message[i + 1] * (i_plus_one)) + int[i];
for (var i = 0; i < max_body_bytes; i++) {
message_b64.in[i] <== body[i];
}
message_b64.in[max_msg_bytes - 1] <== 0;

/************************** JWT REGEXES *****************************/

Expand Down Expand Up @@ -142,4 +132,4 @@ template JWTVerify(max_msg_bytes, max_json_bytes, n, k) {
less_exp_time.out === 1;
}

component main { public [ modulus, time ] } = JWTVerify(1024, 766, 121, 17);
component main { public [ modulus, time ] } = JWTVerify(1024, 900, 673, 121, 17);
6 changes: 4 additions & 2 deletions scripts/generate_input.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -106,7 +106,8 @@ function AsciiArrayToString(arr: Buffer) {
function findDomain(msg: string) {
let domain_idx;
let domain;
var s = Buffer.from(msg, "base64");
const allParts = msg.split(".");
var s = Buffer.from(allParts[1], "base64");
var json = AsciiArrayToString(s);
const email_regex = /([-a-zA-Z._+]+)@([-a-zA-Z]+).([a-zA-Z]+)/;
const match = json.match(email_regex);
Expand All @@ -120,7 +121,8 @@ function findDomain(msg: string) {
}

function findTimestampInJSON(msg: string) {
var s = Buffer.from(msg, "base64");
const allParts = msg.split(".");
var s = Buffer.from(allParts[1], "base64");
var json = AsciiArrayToString(s);
let time_index = json.indexOf(`"exp":`) + 6;
let timestamp = json.substring(time_index, time_index + 10);
Expand Down