providing user entropy

README.md

@@ -64,3 +64,12 @@ $ docker-compose up -d
 1. The `current.params` file is your initial challenge file.
 1. copy `current.params`, `withdraw.json` and `phase1radix*` to `./server/snark_files` folder.
 1. `mv withdraw.json circuit.json`
+
+
+## In case of WASM module changes
+1. go to `phase2` folder in [phase2-bn254](https://github.com/tornadocash/phase2-bn254) (ceremony branch for now) and run the following command:
+1. `wasm-pack build --release --target web -- --no-default-features --features wasm`
+1. it will generate wasm modules in `pkg` folder, then you need to copy it to this project
+1. `cp -r pkg/* <path_to_current_project>/lib/phase2 && cp pkg/phase2_bg.wasm <path_to_current_project>/static/_nuxt/lib/phase2/`
+
+Example: `wasm-pack build --release --target web -- --no-default-features --features wasm && cp -r pkg/* ../../trusted-setup-nuxt/lib/phase2 && cp pkg/phase2_bg.wasm ../../trusted-setup-nuxt/static/_nuxt/lib/phase2/`

lib/phase2/package.json

@@ -20,5 +20,5 @@
   "module": "phase2.js",
   "homepage": "https://github.com/ebfull/phase2",
   "types": "phase2.d.ts",
-  "sideEffects": "false"
+  "sideEffects": false
 }

lib/phase2/phase2.d.ts

@@ -2,9 +2,10 @@
 /* eslint-disable */
 /**
 * @param {Uint8Array} params 
+* @param {Uint8Array} entropy 
 * @returns {Uint8Array} 
 */
-export function contribute(params: Uint8Array): Uint8Array;
+export function contribute(params: Uint8Array, entropy: Uint8Array): Uint8Array;
 
 /**
 * If `module_or_path` is {RequestInfo}, makes a request and

lib/phase2/phase2.js

@@ -70,17 +70,20 @@ function getArrayU8FromWasm0(ptr, len) {
 }
 /**
 * @param {Uint8Array} params
+* @param {Uint8Array} entropy
 * @returns {Uint8Array}
 */
-export function contribute(params) {
+export function contribute(params, entropy) {
     var ptr0 = passArray8ToWasm0(params, wasm.__wbindgen_malloc);
     var len0 = WASM_VECTOR_LEN;
-    wasm.contribute(8, ptr0, len0);
+    var ptr1 = passArray8ToWasm0(entropy, wasm.__wbindgen_malloc);
+    var len1 = WASM_VECTOR_LEN;
+    wasm.contribute(8, ptr0, len0, ptr1, len1);
     var r0 = getInt32Memory0()[8 / 4 + 0];
     var r1 = getInt32Memory0()[8 / 4 + 1];
-    var v1 = getArrayU8FromWasm0(r0, r1).slice();
+    var v2 = getArrayU8FromWasm0(r0, r1).slice();
     wasm.__wbindgen_free(r0, r1 * 1);
-    return v1;
+    return v2;
 }
 
 let cachedTextEncoder = new TextEncoder('utf-8');

lib/phase2/phase2_bg.d.ts

@@ -1,7 +1,7 @@
 /* tslint:disable */
 /* eslint-disable */
 export const memory: WebAssembly.Memory;
-export function contribute(a: number, b: number, c: number): void;
+export function contribute(a: number, b: number, c: number, d: number, e: number): void;
 export function __wbindgen_malloc(a: number): number;
 export function __wbindgen_free(a: number, b: number): void;
 export function __wbindgen_realloc(a: number, b: number, c: number): number;

pages/make-contribution.vue

@@ -60,7 +60,7 @@
     <div class="buttons is-centered">
       <b-button
         v-if="!isContributeBtnSnown"
-        @click="makeContribution"
+        @click="getUserRandom"
         :disabled="isContributeBtnDisabled"
         type="is-primary"
         outlined
@@ -150,8 +150,22 @@ export default {
   },
   methods: {
     ...mapActions('user', ['makeTweet', 'logOut', 'getUserData']),
-    async makeContribution({ retry = 0 } = {}) {
+    getUserRandom() {
+      this.$buefy.dialog.prompt({
+        title: 'Contribution',
+        message: `Please provide a random input. The input, along with browser randomness, will be used as a source of entropy for your contribution.`,
+        inputAttrs: {
+          maxlength: 300
+        },
+        trapFocus: true,
+        onConfirm: (userInput) => {
+          this.makeContribution({ userInput })
+        }
+      })
+    },
+    async makeContribution({ userInput, retry = 0 } = {}) {
       try {
+        const contribute = await this.$contribute()
         this.isContributeBtnSnown = true
         this.status.msg = ''
         this.status.type = ''
@@ -162,12 +176,22 @@ export default {
         this.$root.$emit('enableLoading', 'Generating random contribution')
         await timeout(100) // allow UI to update before freezing in wasm
         console.log('Source params', data)
-        const contribute = await this.$contribute()
+
-        const result = contribute(data)
+        const encoder = new TextEncoder(userInput)
+        const entropyFromUser = encoder.encode(userInput)
+
+        const entropy = new Uint8Array(userInput.length)
+        const entropyFromBrowser = window.crypto.getRandomValues(entropy)
+        // suffle the browser and user random
+        for (let i = 0; i < entropyFromBrowser.length; i++) {
+          entropy[i] = entropyFromBrowser[i] + entropyFromUser[i]
+        }
+
+        console.log('entropy', entropy)
+        const result = contribute(data, entropy)
         console.log('Updated params', result)
 
         this.$root.$emit('enableLoading', 'Uploading and verifying your contribution')
-        console.log('this.user.name', this.userName, this.userHandle, this.userCompany)
         const formData = new FormData()
         formData.append('response', new Blob([result], { type: 'application/octet-stream' }))
         if (this.contributionType !== 'anonymous') {
@@ -202,7 +226,7 @@ export default {
           this.isContributeBtnSnown = false
         }
       } catch (e) {
-        console.error(e.message)
+        console.error(e)
         this.status.msg = e.message
         this.status.type = 'is-danger'
         this.isContributeBtnSnown = false