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initial working demo, basic elements styles, new go method to get lim…
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…its of number of shares and threshold
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@lucasmenendez
lucasmenendez committed Apr 6, 2024
1 parent 7cd17a8 commit 29828b6
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Showing 4 changed files with 176 additions and 43 deletions.
44 changes: 31 additions & 13 deletions cmd/webassembly/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -16,20 +16,33 @@ const (
jsClassName = "GoSSS"
jsHideMethod = "hide"
jsRecoverMethod = "recover"
jsLimitsMethod = "limits"
// required number of arguments for each method
hidedNArgs = 3 // msg, nshares, minshares
recoverdNArgs = 1 // shares
limitsNArgs = 1 // msg
)

func wasmError(err error) js.Value {
return js.Global().Call("throwError", js.ValueOf(err.Error()))
func wasmResult(data interface{}, err error) js.Value {
response := map[string]interface{}{}
if data != nil {
response["data"] = data
}
if err != nil {
response["error"] = err.Error()
}
result, err := json.Marshal(response)
if err != nil {
return js.ValueOf(fmt.Sprintf(`{"error": "%s"}`, err.Error()))
}
return js.ValueOf(string(result))
}

func main() {
gosssClass := js.ValueOf(map[string]interface{}{})
gosssClass.Set(jsHideMethod, js.FuncOf(func(this js.Value, p []js.Value) interface{} {
if len(p) != hidedNArgs {
return wasmError(fmt.Errorf("invalid number of arguments"))
return wasmResult(nil, fmt.Errorf("invalid number of arguments"))
}
msg := p[0].String()
nshares := p[1].Int()
Expand All @@ -40,30 +53,35 @@ func main() {
Min: minshares,
})
if err != nil {
return wasmError(err)
return wasmResult(nil, err)
}
jsonShares, err := json.Marshal(shares)
if err != nil {
return wasmError(err)
}
return string(jsonShares)
return wasmResult(shares, nil)
}))

gosssClass.Set(jsRecoverMethod, js.FuncOf(func(this js.Value, p []js.Value) interface{} {
if len(p) != recoverdNArgs {
return wasmError(fmt.Errorf("invalid number of arguments"))
return wasmResult(nil, fmt.Errorf("invalid number of arguments"))
}
// recover the shares from the json string
var shares []string
if err := json.Unmarshal([]byte(p[0].String()), &shares); err != nil {
return wasmError(err)
return wasmResult(nil, err)
}
// recover the message
msg, err := gosss.RecoverMessage(shares, nil)
if err != nil {
return wasmError(err)
return wasmResult(nil, err)
}
return wasmResult(msg, nil)
}))

gosssClass.Set(jsLimitsMethod, js.FuncOf(func(this js.Value, p []js.Value) interface{} {
if len(p) != limitsNArgs {
return wasmResult(nil, fmt.Errorf("invalid number of arguments"))
}
return string(msg)
// recover the message
minShares, maxShares, minMin, maxMin := gosss.ConfigLimits([]byte(p[0].String()))
return wasmResult([]int{minShares, maxShares, minMin, maxMin}, nil)
}))

js.Global().Set(jsClassName, gosssClass)
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17 changes: 17 additions & 0 deletions config.go
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,23 @@ var DefaultPrime, _ = new(big.Int).SetString("2188824287183927522224640574525727
// using 2 bytes (255^2)
const maxShares = 65536

// ConfigLimits returns the limits for the number of shares and minimum shares
// to recover the original message based on the message size. It returns the
// minimum number of shares, the maximum number of shares, the minimum number
// of shares to recover the secret, and the maximum number of shares to recover
// the secret. The message is divided into parts based on the size of the prime
// number used as finite field, the number of parts is used to calculate the
// limits.
func ConfigLimits(message []byte) (int, int, int, int) {
c := &Config{Prime: DefaultPrime}
secrets := encodeMessage(message, c.maxSecretPartSize())
nSecrets := len(secrets)
minShares := nSecrets * 3
minMin := nSecrets * 2
maxMin := maxShares - nSecrets
return minShares, maxShares, minMin, maxMin
}

// Config struct defines the configuration for the Shamir Secret Sharing
// algorithm. It includes the number of shares to generate, the minimum number
// of shares to recover the secret, and the prime number to use as finite field.
Expand Down
105 changes: 105 additions & 0 deletions web/app.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,105 @@
import { createApp } from 'https://unpkg.com/vue@3/dist/vue.esm-browser.prod.js'

const app = createApp({
data() {
return {
config: {
minShares: 0,
maxShares: 0,
minMin: 0,
maxMin: 0,
},
message: "",
sharesCount: 0,
threshold: 0,
shares: "",
currentTab: "hide",
hide_result: "",
recovered_message: "",
}
},
async created() {
await this.setupWebAssembly();
},
template: `
<div>
<button class="button" @click="currentTab = 'hide'">Hide</button>
<button class="button" @click="currentTab = 'recover'">Recover</button>
<div v-show="currentTab === 'hide'">
<h3>Hide a message</h3>
<textarea class="textarea" v-model="message" placeholder="Enter your message" rows="6"></textarea>
<div v-show="message !== ''">
<label class="label">Shares <small>({{ config.minShares }} - {{ config.maxShares }})</small></label>
<input v-model="sharesCount" type="number" class="input" :min="config.minShares" :max="config.maxShares" :step="config.minShares">
</div>
<div v-show="message !== ''">
<label class="label">Threshold <small>({{ config.minMin }} - {{ sharesCount - 1 }})</small></label>
<input v-model="threshold" type="number" class="input" :min="config.minMin" :max="sharesCount - 1">
</div>
<button class="button is-secondary" :class="{'is-disabled': message == ''}" @click="hideMessage">Hide</button>
<textarea class="textarea" readonly v-model="hide_result" placeholder="Resulting secret parts" rows="6"></textarea>
</div>
<div v-show="currentTab === 'recover'">
<h3>Recover a message</h3>
<textarea class="textarea" v-model="shares" placeholder="Enter shares" rows="6"></textarea>
<button class="button is-secondary" :class="{'is-disabled': message == ''}" @click="recoverMessage">Recover</button>
<textarea class="textarea" readonly v-model="recovered_message" placeholder="Recovered message" rows="6"></textarea>
</div>
</div>
`,
methods: {
async setupWebAssembly() {
const go = new Go();
const result = await WebAssembly.instantiateStreaming(fetch("gosss.wasm"), go.importObject);
go.run(result.instance);
},
getConfig() {
const rawResult = GoSSS.limits(this.message);
const result = JSON.parse(rawResult);
if (!result.error) {
this.config = {
minShares: result.data[0],
maxShares: result.data[1],
minMin: result.data[2],
maxMin: result.data[3],
}
if (this.sharesCount < this.config.minShares) this.sharesCount = this.config.minShares;
if (this.sharesCount > this.config.maxShares) this.sharesCount = this.config.maxShares;
if (this.threshold < this.config.minMin) this.threshold = this.config.minMin;
if (this.threshold > this.sharesCount - 1) this.threshold = this.sharesCount - 1;
} else {
alert(`Error getting configuration: ${result.error}`);
}
},
hideMessage() {
const rawResult = GoSSS.hide(this.message, this.sharesCount, this.threshold);
const result = JSON.parse(rawResult);
if (!result.error) {
this.hide_result = result.data.join("\n");
} else {
alert(`Error hiding message: ${result.error}`);
}
},
recoverMessage() {
const shares = JSON.stringify(this.shares.split("\n"));
const rawResult = GoSSS.recover(shares);
const result = JSON.parse(rawResult);
if (!result.error) {
this.recovered_message = window.atob(result.data);
} else {
alert(`Error recovering message: ${result.error}`);
}
}
},
watch: {
message() {
this.getConfig();
}
},
components: {

}
});

app.mount('#app');
53 changes: 23 additions & 30 deletions web/index.html
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Original file line number Diff line number Diff line change
@@ -1,30 +1,23 @@
<html>
<head>
<title>Go Shamir Secret Sharing demo</title>
</head>
<body>
<script src="wasm_exec.js"></script>
<script>
function throwError(e) {
console.error(e);
}

function hide(message, sharesCount, threshold) {
let rawshares = GoSSS.hide(message, sharesCount, threshold);
return JSON.parse(rawshares);
}

function recover(shares) {
let message = GoSSS.recover(JSON.stringify(shares));
return message;
}

(async function() {
const go = new Go();
const result = await WebAssembly.instantiateStreaming(fetch("gosss.wasm"), go.importObject);
go.run(result.instance);
})()
</script>
</body>
</html>

<!DOCTYPE html>
<html data-theme="light">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Title and favicon (SVG emoji)-->
<title>Shamir Secret Sharing Demo</title>
<link rel="icon"
href="data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 100 100%22><text y=%22.9em%22 font-size=%2290%22>🔐</text></svg>">
<!-- Siimple.css assets -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/siimple/siimple.css" />
</head>
<body>
<!-- App slot -->
<div id="app"></div>
<!-- Import Go WebAssembly engine -->
<script src="wasm_exec.js"></script>
<!-- Import app -->
<script type="module" src="app.js"></script>
</body>
</html>

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