fix: throw proper error when runtime doesn't support OKP

closes #48

Author: panva

lib/jwk/key/okp.js

@@ -5,6 +5,7 @@ const {
   THUMBPRINT_MATERIAL, JWK_MEMBERS, PUBLIC_MEMBERS,
   PRIVATE_MEMBERS, KEY_MANAGEMENT_DECRYPT, KEY_MANAGEMENT_ENCRYPT, OKP_CURVES
 } = require('../../help/consts')
+const { edDSASupported } = require('../../help/runtime_support')
 const errors = require('../../errors')
 
 const Key = require('./base')
@@ -99,6 +100,10 @@ class OKPKey extends Key {
   }
 
   static async generate (crv = 'Ed25519', privat = true) {
+    if (!edDSASupported) {
+      throw new errors.JOSENotSupported('OKP keys are not supported in your Node.js runtime version')
+    }
+
     if (!OKP_CURVES.has(crv)) {
       throw new errors.JOSENotSupported(`unsupported OKP key curve: ${crv}`)
     }
@@ -109,6 +114,10 @@ class OKPKey extends Key {
   }
 
   static generateSync (crv = 'Ed25519', privat = true) {
+    if (!edDSASupported) {
+      throw new errors.JOSENotSupported('OKP keys are not supported in your Node.js runtime version')
+    }
+
     if (!OKP_CURVES.has(crv)) {
       throw new errors.JOSENotSupported(`unsupported OKP key curve: ${crv}`)
     }

test/jwk/generate.test.js

@@ -151,17 +151,31 @@ test('fails to generate unsupported kty', async t => {
   }, { instanceOf: errors.JOSENotSupported, message: 'unsupported key type: foo' })
 })
 
-test('fails to generate unsupported OKP crv', async t => {
-  await t.throwsAsync(() => {
-    return generate('OKP', 'foo')
-  }, { instanceOf: errors.JOSENotSupported, message: 'unsupported OKP key curve: foo' })
-})
+if (edDSASupported) {
+  test('fails to generate unsupported OKP crv', async t => {
+    await t.throwsAsync(() => {
+      return generate('OKP', 'foo')
+    }, { instanceOf: errors.JOSENotSupported, message: 'unsupported OKP key curve: foo' })
+  })
 
-test('fails to generateSync unsupported OKP crv', async t => {
-  await t.throws(() => {
-    return generateSync('OKP', 'foo')
-  }, { instanceOf: errors.JOSENotSupported, message: 'unsupported OKP key curve: foo' })
-})
+  test('fails to generateSync unsupported OKP crv', async t => {
+    await t.throws(() => {
+      return generateSync('OKP', 'foo')
+    }, { instanceOf: errors.JOSENotSupported, message: 'unsupported OKP key curve: foo' })
+  })
+} else {
+  test('fails to generate OKP when not supported', async t => {
+    await t.throwsAsync(() => {
+      return generate('OKP')
+    }, { instanceOf: errors.JOSENotSupported, message: 'OKP keys are not supported in your Node.js runtime version' })
+  })
+
+  test('fails to generateSync OKP when not supported', async t => {
+    await t.throws(() => {
+      return generateSync('OKP')
+    }, { instanceOf: errors.JOSENotSupported, message: 'OKP keys are not supported in your Node.js runtime version' })
+  })
+}
 
 test('fails to generateSync unsupported EC crv', t => {
   t.throws(() => {