Drop fnv-plus, handwrite fnv-hash

build/main.cjs

@@ -2,13 +2,8 @@
 
 Object.defineProperty(exports, '__esModule', { value: true });
 
-var fnv = require('fnv-plus');
 var ffjavascript = require('ffjavascript');
 
-function _interopDefaultLegacy (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }
-
-var fnv__default = /*#__PURE__*/_interopDefaultLegacy(fnv);
-
 /*
 
 Copyright 2020 0KIMS association.
@@ -44,7 +39,17 @@ function flatArray(a) {
 }
 
 function fnvHash(str) {
-    return fnv__default['default'].hash(str, 64).hex();
+    const uint64_max = BigInt(2) ** BigInt(64);
+    let hash = BigInt("0xCBF29CE484222325");
+    for (var i = 0; i < str.length; i++) {
+    hash ^= BigInt(str[i].charCodeAt());
+    hash *= BigInt(0x100000001B3);
+    hash %= uint64_max;
+    }
+    let shash = hash.toString(16);
+    let n = 16 - shash.length;
+    shash = '0'.repeat(n).concat(shash);
+    return shash;
 }
 
 /* globals WebAssembly */

js/utils.js

@@ -16,8 +16,6 @@ limitations under the License.
 
 */
 
-import fnv from "fnv-plus";
-
 export function flatArray(a) {
     var res = [];
     fillArray(res, a);
@@ -35,5 +33,15 @@ export function flatArray(a) {
 }
 
 export function fnvHash(str) {
-    return fnv.hash(str, 64).hex();
+    const uint64_max = BigInt(2) ** BigInt(64);
+    let hash = BigInt("0xCBF29CE484222325");
+    for (var i = 0; i < str.length; i++) {
+    hash ^= BigInt(str[i].charCodeAt());
+    hash *= BigInt(0x100000001B3);
+    hash %= uint64_max;
+    }
+    let shash = hash.toString(16);
+    let n = 16 - shash.length;
+    shash = '0'.repeat(n).concat(shash);
+    return shash;
 }

package.json

@@ -34,8 +34,7 @@
   },
   "homepage": "https://github.com/iden3/circom_runtime#readme",
   "dependencies": {
-    "ffjavascript": "0.2.39",
-    "fnv-plus": "^1.3.1"
+    "ffjavascript": "0.2.39"
   },
   "devDependencies": {
     "eslint": "^6.8.0",