Ensure text encoding/decoding is performed.

Author: dlongley

lib/DidJwkDriver.js

@@ -172,7 +172,7 @@ export class DidJwkDriver {
     let jwkJson;
     let jwk;
     try {
-      jwkJson = base64url.decode(encodedJwk);
+      jwkJson = new TextDecoder().decode(base64url.decode(encodedJwk));
     } catch(e) {
       const error = new Error(
         `Could not decode base64url-encoded JWK from "${encodedJwk}".`);
@@ -220,7 +220,9 @@ export class DidJwkDriver {
     did, jwk, verificationMethodType = 'JsonWebKey'
   } = {}) {
     if(did === undefined) {
-      did = `did:jwk:${base64url.encode(JSON.stringify(jwk))}`;
+      const encoded = base64url.encode(
+        new TextEncoder().encode(JSON.stringify(jwk)));
+      did = `did:jwk:${encoded}`;
     } else if(typeof did !== 'string') {
       throw new TypeError('"did" must be a string.');
     }