From 0a79b2da1b94ad521964f4565d518e6fcb1febe2 Mon Sep 17 00:00:00 2001
From: Matteo Collina <hello@matteocollina.com>
Date: Thu, 13 Apr 2017 01:25:38 +0100
Subject: [PATCH] crypto: make LazyTransform compabile with Streams1

Makes LazyTransform writable by Streams1 by assigning .writable = true
before the actual classes are loaded.

Fixes: https://github.com/nodejs/node/issues/12269
PR-URL: https://github.com/nodejs/node/pull/12380
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
---
 lib/internal/streams/lazy_transform.js        |  2 ++
 .../test-crypto-lazy-transform-writable.js    | 34 +++++++++++++++++++
 2 files changed, 36 insertions(+)
 create mode 100644 test/parallel/test-crypto-lazy-transform-writable.js

diff --git a/lib/internal/streams/lazy_transform.js b/lib/internal/streams/lazy_transform.js
index bd68bef4b6dd17..9f2ec8b99c2344 100644
--- a/lib/internal/streams/lazy_transform.js
+++ b/lib/internal/streams/lazy_transform.js
@@ -10,6 +10,8 @@ module.exports = LazyTransform;
 
 function LazyTransform(options) {
   this._options = options;
+  this.writable = true;
+  this.readable = true;
 }
 util.inherits(LazyTransform, stream.Transform);
 
diff --git a/test/parallel/test-crypto-lazy-transform-writable.js b/test/parallel/test-crypto-lazy-transform-writable.js
new file mode 100644
index 00000000000000..2c4fbaf39a6738
--- /dev/null
+++ b/test/parallel/test-crypto-lazy-transform-writable.js
@@ -0,0 +1,34 @@
+'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+const crypto = require('crypto');
+const Stream = require('stream');
+const util = require('util');
+
+const hasher1 = crypto.createHash('sha256');
+const hasher2 = crypto.createHash('sha256');
+
+// Calculate the expected result.
+hasher1.write(Buffer.from('hello world'));
+hasher1.end();
+
+const expected = hasher1.read().toString('hex');
+
+function OldStream() {
+  Stream.call(this);
+
+  this.readable = true;
+}
+util.inherits(OldStream, Stream);
+
+const stream = new OldStream();
+
+stream.pipe(hasher2).on('finish', common.mustCall(function() {
+  const hash = hasher2.read().toString('hex');
+  assert.strictEqual(expected, hash);
+}));
+
+stream.emit('data', Buffer.from('hello'));
+stream.emit('data', Buffer.from(' world'));
+stream.emit('end');