From 2a7c858662bf5ff6cc2d850ccd052b9809c3bbe2 Mon Sep 17 00:00:00 2001
From: Trent Larson <trent@trentlarson.com>
Date: Mon, 9 Jan 2023 19:08:41 -0700
Subject: [PATCH] refactor: use our own SimpleSigner since library version is
 deprecated

---
 package-lock.json        |  7 ++--
 package.json             |  1 +
 src/libs/crypto/index.ts | 81 +++++++++++++++-------------------------
 3 files changed, 36 insertions(+), 53 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index cbbedcc..793ed30 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -26,6 +26,7 @@
         "class-transformer": "^0.5.1",
         "core-js": "^3.26.1",
         "dexie": "^3.2.2",
+        "did-jwt": "^6.9.0",
         "ethereum-cryptography": "^1.1.2",
         "ethereumjs-util": "^7.1.5",
         "ethr-did-resolver": "^8.0.0",
@@ -12186,9 +12187,9 @@
       }
     },
     "node_modules/did-jwt": {
-      "version": "6.10.1",
-      "resolved": "https://registry.npmjs.org/did-jwt/-/did-jwt-6.10.1.tgz",
-      "integrity": "sha512-YJOvkuPKKX364ooAFNxZPcz/KBLRwLhRABQVQlVEqOjygsCkplNFB3UL97UqZ7Y3cAG6Jh5jKoAC4xFSm+h0qw==",
+      "version": "6.9.0",
+      "resolved": "https://registry.npmjs.org/did-jwt/-/did-jwt-6.9.0.tgz",
+      "integrity": "sha512-kZ8pakovM2VkG0pia6x0SA9/1rl9dOUti4i2FL3xg7arJDWW7dACJxX+6gQK7iR/DvXrfFo8F784ejHVbw9ryA==",
       "dependencies": {
         "@stablelib/ed25519": "^1.0.2",
         "@stablelib/random": "^1.0.1",
diff --git a/package.json b/package.json
index 178ca01..e6a9fb7 100644
--- a/package.json
+++ b/package.json
@@ -26,6 +26,7 @@
     "class-transformer": "^0.5.1",
     "core-js": "^3.26.1",
     "dexie": "^3.2.2",
+    "did-jwt": "^6.9.0",
     "ethereum-cryptography": "^1.1.2",
     "ethereumjs-util": "^7.1.5",
     "ethr-did-resolver": "^8.0.0",
diff --git a/src/libs/crypto/index.ts b/src/libs/crypto/index.ts
index eb4e6b8..a760295 100644
--- a/src/libs/crypto/index.ts
+++ b/src/libs/crypto/index.ts
@@ -5,44 +5,8 @@ import { entropyToMnemonic } from "ethereum-cryptography/bip39";
 import { wordlist } from "ethereum-cryptography/bip39/wordlists/english";
 import { HDNode } from "@ethersproject/hdnode";
 import * as didJwt from "did-jwt";
-import { Signer } from "did-jwt";
 import * as u8a from "uint8arrays";
 
-export function hexToBytes(s: string): Uint8Array {
-  const input = s.startsWith("0x") ? s.substring(2) : s;
-  return u8a.fromString(input.toLowerCase(), "base16");
-}
-
-export function fromJose(signature: string): {
-  r: string;
-  s: string;
-  recoveryParam?: number;
-} {
-  const signatureBytes: Uint8Array = base64ToBytes(signature);
-  if (signatureBytes.length < 64 || signatureBytes.length > 65) {
-    throw new TypeError(
-      `Wrong size for signature. Expected 64 or 65 bytes, but got ${signatureBytes.length}`
-    );
-  }
-  const r = bytesToHex(signatureBytes.slice(0, 32));
-  const s = bytesToHex(signatureBytes.slice(32, 64));
-  const recoveryParam =
-    signatureBytes.length === 65 ? signatureBytes[64] : undefined;
-  return { r, s, recoveryParam };
-}
-
-export function bytesToHex(b: Uint8Array): string {
-  return u8a.toString(b, "base16");
-}
-
-export function base64ToBytes(s: string): Uint8Array {
-  const inputBase64Url = s
-    .replace(/\+/g, "-")
-    .replace(/\//g, "_")
-    .replace(/=/g, "");
-  return u8a.fromString(inputBase64Url, "base64url");
-}
-
 /**
  *
  *
@@ -117,12 +81,8 @@ export const createIdentifier = (): string => {
 export const accessToken = async (identifier: IIdentifier) => {
   const did: string = identifier.did;
   const privateKeyHex: string = identifier.keys[0].privateKeyHex as string;
-  //const input = privateKeyHex.startsWith("0x")
-  //  ? privateKeyHex.substring(2)
-  //  : privateKeyHex;
-  //const privateKeyBytes = u8a.fromString(input.toLowerCase(), "base16");
 
-  const signer = didJwt.SimpleSigner(privateKeyHex);
+  const signer = SimpleSigner(privateKeyHex);
 
   const nowEpoch = Math.floor(Date.now() / 1000);
   const endEpoch = nowEpoch + 60; // add one minute
@@ -138,17 +98,14 @@ export const accessToken = async (identifier: IIdentifier) => {
 };
 
 export const sign = async (privateKeyHex: string) => {
-  //const input = privateKeyHex.startsWith("0x")
-  //  ? privateKeyHex.substring(2)
-  //  : privateKeyHex;
-  //  const privateKeyBytes = u8a.fromString(input.toLowerCase(), "base16");
-
-  const signer = didJwt.SimpleSigner(privateKeyHex);
+  const signer = SimpleSigner(privateKeyHex);
 
   return signer;
 };
 
 /**
+ *  Copied out of did-jwt since it's deprecated in that library.
+ *
  *  The SimpleSigner returns a configured function for signing data.
  *
  *  @example
@@ -160,10 +117,34 @@ export const sign = async (privateKeyHex: string) => {
  *  @param    {String}         hexPrivateKey    a hex encoded private key
  *  @return   {Function}                     a configured signer function
  */
-export const SimpleSigner = async (hexPrivateKey: string): Promise<Signer> => {
-  const signer = didJwt.ES256KSigner(hexToBytes(hexPrivateKey), true);
+export function SimpleSigner(hexPrivateKey: string): didJwt.Signer {
+  const signer = didJwt.ES256KSigner(didJwt.hexToBytes(hexPrivateKey), true);
   return async (data) => {
     const signature = (await signer(data)) as string;
     return fromJose(signature);
   };
-};
+}
+
+// from did-jwt/util; see SimpleSigner above
+export function fromJose(signature: string): {
+  r: string;
+  s: string;
+  recoveryParam?: number;
+} {
+  const signatureBytes: Uint8Array = didJwt.base64ToBytes(signature);
+  if (signatureBytes.length < 64 || signatureBytes.length > 65) {
+    throw new TypeError(
+      `Wrong size for signature. Expected 64 or 65 bytes, but got ${signatureBytes.length}`
+    );
+  }
+  const r = bytesToHex(signatureBytes.slice(0, 32));
+  const s = bytesToHex(signatureBytes.slice(32, 64));
+  const recoveryParam =
+    signatureBytes.length === 65 ? signatureBytes[64] : undefined;
+  return { r, s, recoveryParam };
+}
+
+// from did-jwt/util; see SimpleSigner above
+export function bytesToHex(b: Uint8Array): string {
+  return u8a.toString(b, "base16");
+}