crypto: remove webcrypto EdDSA key checks and properties

As per WICG/webcrypto-secure-curves#24

Author: panva

lib/internal/crypto/cfrg.js

@@ -272,17 +272,6 @@ async function cfrgImportKey(
           'DataError');
       }
 
-      if (keyData.alg !== undefined) {
-        if (
-          (name === 'Ed25519' || name === 'Ed448') &&
-          keyData.alg !== 'EdDSA'
-        ) {
-          throw lazyDOMException(
-            'JWK "alg" does not match the requested algorithm',
-            'DataError');
-        }
-      }
-
       if (!isPublic && typeof keyData.x !== 'string') {
         throw lazyDOMException('Invalid JWK', 'DataError');
       }

lib/internal/crypto/webcrypto.js

@@ -475,7 +475,6 @@ async function exportKeyJWK(key) {
       // Fall through
     case 'Ed448':
       jwk.crv ||= key.algorithm.name;
-      jwk.alg = 'EdDSA';
       return jwk;
     case 'AES-CTR':
       // Fall through

test/parallel/test-webcrypto-export-import-cfrg.js

@@ -251,13 +251,8 @@ async function testImportJwk({ name, publicUsages, privateUsages }, extractable)
     assert.strictEqual(pvtJwk.crv, jwk.crv);
     assert.strictEqual(pvtJwk.d, jwk.d);
 
-    if (jwk.crv.startsWith('Ed')) {
-      assert.strictEqual(pubJwk.alg, 'EdDSA');
-      assert.strictEqual(pvtJwk.alg, 'EdDSA');
-    } else {
-      assert.strictEqual(pubJwk.alg, undefined);
-      assert.strictEqual(pvtJwk.alg, undefined);
-    }
+    assert.strictEqual(pubJwk.alg, undefined);
+    assert.strictEqual(pvtJwk.alg, undefined);
   } else {
     await assert.rejects(
       subtle.exportKey('jwk', publicKey), {
@@ -281,24 +276,23 @@ async function testImportJwk({ name, publicUsages, privateUsages }, extractable)
       { message: 'Invalid JWK "use" Parameter' });
   }
 
+  // https://github.com/WICG/webcrypto-secure-curves/pull/24
   if (name.startsWith('Ed')) {
-    await assert.rejects(
+    await assert.doesNotReject(
       subtle.importKey(
         'jwk',
         { kty: jwk.kty, x: jwk.x, crv: jwk.crv, alg: 'foo' },
         { name },
         extractable,
-        publicUsages),
-      { message: 'JWK "alg" does not match the requested algorithm' });
+        publicUsages));
 
-    await assert.rejects(
+    await assert.doesNotReject(
       subtle.importKey(
         'jwk',
         { ...jwk, alg: 'foo' },
         { name },
         extractable,
-        privateUsages),
-      { message: 'JWK "alg" does not match the requested algorithm' });
+        privateUsages));
   }
 
   for (const crv of [undefined, name === 'Ed25519' ? 'Ed448' : 'Ed25519']) {