crypto: allow monkey patching of pseudoRandomBytes

Make `pseudoRandomBytes` and it's aliases `prng` and `rng`
configurable to allow monkey patching.

PR-URL: #24108
Refs: #22519
Refs: #23017
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Ujjwal Sharma <usharma1998@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Vladimir de Turckheim <vlad2t@hotmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/crypto.js

@@ -247,19 +247,25 @@ Object.defineProperties(exports, {
   // The ecosystem needs those to exist for backwards compatibility.
   prng: {
     enumerable: false,
+    configurable: true,
+    writable: true,
     value: pendingDeprecation ?
       deprecate(randomBytes, 'crypto.prng is deprecated.', 'DEP0115') :
       randomBytes
   },
   pseudoRandomBytes: {
     enumerable: false,
+    configurable: true,
+    writable: true,
     value: pendingDeprecation ?
       deprecate(randomBytes,
                 'crypto.pseudoRandomBytes is deprecated.', 'DEP0115') :
       randomBytes
   },
   rng: {
     enumerable: false,
+    configurable: true,
+    writable: true,
     value: pendingDeprecation ?
       deprecate(randomBytes, 'crypto.rng is deprecated.', 'DEP0115') :
       randomBytes

test/parallel/test-crypto-random.js

@@ -306,3 +306,12 @@ assert.throws(
     }
   );
 });
+
+
+['pseudoRandomBytes', 'prng', 'rng'].forEach((f) => {
+  const desc = Object.getOwnPropertyDescriptor(crypto, f);
+  assert.ok(desc);
+  assert.strictEqual(desc.configurable, true);
+  assert.strictEqual(desc.writable, true);
+  assert.strictEqual(desc.enumerable, false);
+});