feat: add entropy to sign

.changeset/witty-doors-play.md

@@ -0,0 +1,5 @@
+---
+"ox": patch
+---
+
+Added non-deterministic signature generation.

biome.json

@@ -1,13 +1,7 @@
 {
   "$schema": "https://biomejs.dev/schemas/1.5.3/schema.json",
   "files": {
-    "ignore": [
-      "contracts/generated.ts",
-      "contracts/lib",
-      "test/kzg",
-      "tsconfig.json",
-      "tsconfig.*.json"
-    ]
+    "ignore": ["contracts/", "test/kzg", "tsconfig.json", "tsconfig.*.json"]
   },
   "organizeImports": {
     "enabled": true

site/pages/guides/eip-1193.md

@@ -55,6 +55,7 @@ Event emitters for EIP-1193 Providers can be created using [`Provider.createEmit
 Useful for Wallets that distribute an EIP-1193 Provider (e.g. webpage injection via `window.ethereum`).
 
 ```ts twoslash
+// @noErrors
 import { Provider, RpcRequest, RpcResponse } from 'ox'
 
 // 1. Instantiate a Provider Emitter.

src/core/P256.ts

@@ -4,6 +4,7 @@ import type * as Errors from './Errors.js'
 import * as Hex from './Hex.js'
 import * as PublicKey from './PublicKey.js'
 import type * as Signature from './Signature.js'
+import * as Entropy from './internal/entropy.js'
 
 /** Re-export of noble/curves P256 utilities. */
 export const noble = secp256r1
@@ -150,7 +151,11 @@ export function sign(options: sign.Options): Signature.Signature {
   const { r, s, recovery } = secp256r1.sign(
     payload instanceof Uint8Array ? payload : Bytes.fromHex(payload),
     privateKey instanceof Uint8Array ? privateKey : Bytes.fromHex(privateKey),
-    ...(hash ? [{ prehash: true, lowS: true }] : []),
+    {
+      extraEntropy: Entropy.extraEntropy,
+      lowS: true,
+      ...(hash ? { prehash: true } : {}),
+    },
   )
   return {
     r,

src/core/Secp256k1.ts

@@ -5,6 +5,7 @@ import type * as Errors from './Errors.js'
 import * as Hex from './Hex.js'
 import * as PublicKey from './PublicKey.js'
 import type * as Signature from './Signature.js'
+import * as Entropy from './internal/entropy.js'
 import type { OneOf } from './internal/types.js'
 
 /** Re-export of noble/curves secp256k1 utilities. */
@@ -191,7 +192,11 @@ export function sign(options: sign.Options): Signature.Signature {
   const { r, s, recovery } = secp256k1.sign(
     Bytes.from(payload),
     Bytes.from(privateKey),
-    ...(hash ? [{ prehash: true, lowS: true }] : []),
+    {
+      extraEntropy: Entropy.extraEntropy,
+      lowS: true,
+      ...(hash ? { prehash: true } : {}),
+    },
   )
   return {
     r,

src/core/_test/P256.test.ts

@@ -79,12 +79,12 @@ describe('sign', () => {
       })
       expect(signature).toMatchInlineSnapshot(
         `
-    {
-      "r": 25696373395957984486324188498890325781005829812399813021478384321951480608605n,
-      "s": 71471412582193316356881596002626442093973157771381586232812188859587069632849n,
-      "yParity": 0,
-    }
-  `,
+        {
+          "r": 25696373395957984486324188498890325781005829812399813021478384321951480608605n,
+          "s": 44320676628162932405815850946781131436023797452754174109610070201481442411520n,
+          "yParity": 1,
+        }
+      `,
       )
       expect(
         P256.verify({
@@ -112,12 +112,12 @@ describe('sign', () => {
       })
       expect(signature).toMatchInlineSnapshot(
         `
-    {
-      "r": 109093915289726021639001379260733771573757231672849462488223442695417941697300n,
-      "s": 109093247477094054921870710630193648963091633971756441119531150894951521569389n,
-      "yParity": 1,
-    }
-  `,
+        {
+          "r": 109093915289726021639001379260733771573757231672849462488223442695417941697300n,
+          "s": 6698841733262193840826736319213924566905321252379319222891108166116990474980n,
+          "yParity": 0,
+        }
+      `,
       )
       expect(
         P256.verify({

src/core/internal/entropy.ts

@@ -0,0 +1,6 @@
+export let extraEntropy: boolean
+
+/** @internal */
+export function setExtraEntropy(entropy: boolean) {
+  extraEntropy = entropy
+}

test/setup.ts

@@ -1,6 +1,9 @@
 import { Caches } from 'ox'
 import { afterAll, beforeAll, beforeEach, vi } from 'vitest'
 import * as instances from './anvil.js'
+import * as Entropy from '../src/core/internal/entropy.js'
+
+Entropy.setExtraEntropy(false)
 
 beforeAll(() => {
   vi.mock('../src/core/internal/errors.ts', async () => ({