From aa0305154fbac4a4536471acc9bbd34430e2ccd9 Mon Sep 17 00:00:00 2001
From: Christophe Diederichs <chris.d.itunes@gmail.com>
Date: Thu, 18 Jun 2020 14:09:12 +0200
Subject: [PATCH] move crypto_hash_sha256 to module to uncouple wasm
 dependencies

---
 crypto_hash.js     | 15 +++------------
 crypto_hash_256.js | 18 ++++++++++++++++++
 index.js           |  1 +
 3 files changed, 22 insertions(+), 12 deletions(-)
 create mode 100644 crypto_hash_256.js

diff --git a/crypto_hash.js b/crypto_hash.js
index 53c2c2b..77d29d2 100644
--- a/crypto_hash.js
+++ b/crypto_hash.js
@@ -1,18 +1,11 @@
-const sha256 = require('sha256-wasm')
 const sha512 = require('sha512-wasm')
 const assert = require('nanoassert')
 
-var crypto_hash_sha256_BYTES = 32
+if (new Uint16Array([1])[0] !== 1) throw new Error('Big endian architecture is not supported.')
+
 var crypto_hash_sha512_BYTES = 64
 var crypto_hash_BYTES = crypto_hash_sha512_BYTES
 
-function crypto_hash_sha256 (out, m, n) {
-  assert(out.byteLength === crypto_hash_sha256_BYTES, "out must be 'crypto_hash_sha256_BYTES' bytes long")
-
-  sha256().update(m.subarray(0, n)).digest(out)
-  return 0
-}
-
 function crypto_hash_sha512 (out, m, n) {
   assert(out.byteLength === crypto_hash_sha512_BYTES, "out must be 'crypto_hash_sha512_BYTES' bytes long")
 
@@ -26,8 +19,6 @@ function crypto_hash (out, m, n) {
 
 module.exports = {
   crypto_hash,
-  crypto_hash_sha256,
   crypto_hash_sha512,
-  crypto_hash_BYTES,
-  crypto_hash_sha256_BYTES
+  crypto_hash_BYTES
 }
diff --git a/crypto_hash_256.js b/crypto_hash_256.js
new file mode 100644
index 0000000..cbe0543
--- /dev/null
+++ b/crypto_hash_256.js
@@ -0,0 +1,18 @@
+const sha256 = require('sha256-wasm')
+const assert = require('nanoassert')
+
+if (new Uint16Array([1])[0] !== 1) throw new Error('Big endian architecture is not supported.')
+
+var crypto_hash_sha256_BYTES = 32
+
+function crypto_hash_sha256 (out, m, n) {
+  assert(out.byteLength === crypto_hash_sha256_BYTES, "out must be 'crypto_hash_sha256_BYTES' bytes long")
+
+  sha256().update(m.subarray(0, n)).digest(out)
+  return 0
+}
+
+module.exports = {
+  crypto_hash_sha256,
+  crypto_hash_sha256_BYTES
+}
diff --git a/index.js b/index.js
index 11292c6..1a9f228 100644
--- a/index.js
+++ b/index.js
@@ -23,6 +23,7 @@ sodium.sodium_malloc = function (n) {
 forward(require('./crypto_box'))
 forward(require('./crypto_generichash'))
 forward(require('./crypto_hash'))
+forward(require('./crypto_hash_sha256'))
 forward(require('./crypto_kdf'))
 forward(require('./crypto_kx'))
 forward(require('./crypto_aead'))