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mafintosh · Jun 21, 2017 · 3b99cd8 · 3b99cd8
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diff --git a/.gitignore b/.gitignore
@@ -0,0 +1 @@
+node_modules
diff --git a/LICENSE b/LICENSE
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2017 Mathias Buus
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/README.md b/README.md
@@ -0,0 +1,17 @@
+# xsalsa20
+
+WIP - nothing to see here
+
+```
+npm install xsalsa20
+```
+
+## Usage
+
+``` js
+var xsalsa20 = require('xsalsa20')
+```
+
+## License
+
+MIT
diff --git a/index.js b/index.js
@@ -0,0 +1,28 @@
+var fs = require('fs')
+var toUint8Array = require('base64-to-uint8array')
+
+var WASM = toUint8Array(fs.readFileSync(__dirname + '/xsalsa20.wasm', 'base64'))
+var mod
+var mem
+var rdy
+
+exports.WASM_SUPPORTED = typeof WebAssembly !== 'undefined'
+
+function ready (cb) {
+  if (!cb) cb = noop
+  if (!exports.WASM_SUPPORTED) return cb()
+  if (!rdy) rdy = WebAssembly.instantiate(WASM).then(setup)
+  return rdy.then(cb).catch(cb)
+}
+
+function noop () {}
+
+function setup (w) {
+  mod = w.instance.exports
+  mem = new Uint8Array(w.instance.exports.memory.buffer)
+}
+
+ready(function () {
+  mod.core_hsalsa20(0, 32, 48)
+  console.log(new Buffer(mem.slice(0, 32)))
+})
diff --git a/package.json b/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "xsalsa20",
+  "version": "0.0.0",
+  "description": "XSalsa20 implemented in Javascript and WebAssembly",
+  "main": "index.js",
+  "dependencies": {
+    "base64-to-uint8array": "^1.0.0"
+  },
+  "devDependencies": {},
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/mafintosh/xsalsa20.git"
+  },
+  "author": "Mathias Buus (@mafintosh)",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/mafintosh/xsalsa20/issues"
+  },
+  "homepage": "https://github.com/mafintosh/xsalsa20"
+}
diff --git a/xsalsa20.wasm b/xsalsa20.wasm
diff --git a/xsalsa20.wat b/xsalsa20.wat
@@ -0,0 +1,96 @@
+(module
+  (memory (export "memory") 10 10)
+
+  (func (export "core_hsalsa20") (param $out_ptr i32) (param $in_ptr i32) (param $key_ptr i32)
+    ;; uint32_t x0, x1, x2, x3, x4, x5, x6, x7, x8,
+    ;;          x9, x10, x11, x12, x13, x14,  x15;
+    ;; int      i;
+
+    (local $x0 i32)
+    (local $x1 i32)
+    (local $x2 i32)
+    (local $x3 i32)
+    (local $x4 i32)
+    (local $x5 i32)
+    (local $x6 i32)
+    (local $x7 i32)
+    (local $x8 i32)
+    (local $x9 i32)
+    (local $x10 i32)
+    (local $x11 i32)
+    (local $x12 i32)
+    (local $x13 i32)
+    (local $x14 i32)
+    (local $x15 i32)
+    (local $i i32)
+
+    (set_local $x0 (i32.const 0x61707865))
+    (set_local $x5 (i32.const 0x3320646e))
+    (set_local $x10 (i32.const 0x79622d32))
+    (set_local $x15 (i32.const 0x6b206574))
+
+    (set_local $x1 (i32.load (get_local $key_ptr)))
+    (set_local $x2 (i32.load (i32.add (get_local $key_ptr) (i32.const 4))))
+    (set_local $x3 (i32.load (i32.add (get_local $key_ptr) (i32.const 8))))
+    (set_local $x4 (i32.load (i32.add (get_local $key_ptr) (i32.const 12))))
+    (set_local $x11 (i32.load (i32.add (get_local $key_ptr) (i32.const 16))))
+    (set_local $x12 (i32.load (i32.add (get_local $key_ptr) (i32.const 20))))
+    (set_local $x13 (i32.load (i32.add (get_local $key_ptr) (i32.const 24))))
+    (set_local $x14 (i32.load (i32.add (get_local $key_ptr) (i32.const 28))))
+    (set_local $x6 (i32.load (get_local $in_ptr)))
+    (set_local $x7 (i32.load (i32.add (get_local $in_ptr) (i32.const 4))))
+    (set_local $x8 (i32.load (i32.add (get_local $in_ptr) (i32.const 8))))
+    (set_local $x9 (i32.load (i32.add (get_local $in_ptr) (i32.const 12))))
+
+    ;; rounds
+    (set_local $i (i32.const 20))
+    (block $end_loop
+      (loop $start_loop
+        (br_if $end_loop (i32.eq (get_local $i) (i32.const 0)))
+        (set_local $x4 (i32.xor (get_local $x4) (i32.rotl (i32.add (get_local $x0) (get_local $x12)) (i32.const 7))))
+        (set_local $x8 (i32.xor (get_local $x8) (i32.rotl (i32.add (get_local $x4) (get_local $x0)) (i32.const 9))))
+        (set_local $x12 (i32.xor (get_local $x12) (i32.rotl (i32.add (get_local $x8) (get_local $x4)) (i32.const 13))))
+        (set_local $x0 (i32.xor (get_local $x0) (i32.rotl (i32.add (get_local $x12) (get_local $x8)) (i32.const 18))))
+        (set_local $x9 (i32.xor (get_local $x9) (i32.rotl (i32.add (get_local $x5) (get_local $x1)) (i32.const 7))))
+        (set_local $x13 (i32.xor (get_local $x13) (i32.rotl (i32.add (get_local $x9) (get_local $x5)) (i32.const 9))))
+        (set_local $x1 (i32.xor (get_local $x1) (i32.rotl (i32.add (get_local $x13) (get_local $x9)) (i32.const 13))))
+        (set_local $x5 (i32.xor (get_local $x5) (i32.rotl (i32.add (get_local $x1) (get_local $x13)) (i32.const 18))))
+        (set_local $x14 (i32.xor (get_local $x14) (i32.rotl (i32.add (get_local $x10) (get_local $x6)) (i32.const 7))))
+        (set_local $x2 (i32.xor (get_local $x2) (i32.rotl (i32.add (get_local $x14) (get_local $x10)) (i32.const 9))))
+        (set_local $x6 (i32.xor (get_local $x6) (i32.rotl (i32.add (get_local $x2) (get_local $x14)) (i32.const 13))))
+        (set_local $x10 (i32.xor (get_local $x10) (i32.rotl (i32.add (get_local $x6) (get_local $x2)) (i32.const 18))))
+        (set_local $x3 (i32.xor (get_local $x3) (i32.rotl (i32.add (get_local $x15) (get_local $x11)) (i32.const 7))))
+        (set_local $x7 (i32.xor (get_local $x7) (i32.rotl (i32.add (get_local $x3) (get_local $x15)) (i32.const 9))))
+        (set_local $x11 (i32.xor (get_local $x11) (i32.rotl (i32.add (get_local $x7) (get_local $x3)) (i32.const 13))))
+        (set_local $x15 (i32.xor (get_local $x15) (i32.rotl (i32.add (get_local $x11) (get_local $x7)) (i32.const 18))))
+        (set_local $x1 (i32.xor (get_local $x1) (i32.rotl (i32.add (get_local $x0) (get_local $x3)) (i32.const 7))))
+        (set_local $x2 (i32.xor (get_local $x2) (i32.rotl (i32.add (get_local $x1) (get_local $x0)) (i32.const 9))))
+        (set_local $x3 (i32.xor (get_local $x3) (i32.rotl (i32.add (get_local $x2) (get_local $x1)) (i32.const 13))))
+        (set_local $x0 (i32.xor (get_local $x0) (i32.rotl (i32.add (get_local $x3) (get_local $x2)) (i32.const 18))))
+        (set_local $x6 (i32.xor (get_local $x6) (i32.rotl (i32.add (get_local $x5) (get_local $x4)) (i32.const 7))))
+        (set_local $x7 (i32.xor (get_local $x7) (i32.rotl (i32.add (get_local $x6) (get_local $x5)) (i32.const 9))))
+        (set_local $x4 (i32.xor (get_local $x4) (i32.rotl (i32.add (get_local $x7) (get_local $x6)) (i32.const 13))))
+        (set_local $x5 (i32.xor (get_local $x5) (i32.rotl (i32.add (get_local $x4) (get_local $x7)) (i32.const 18))))
+        (set_local $x11 (i32.xor (get_local $x11) (i32.rotl (i32.add (get_local $x10) (get_local $x9)) (i32.const 7))))
+        (set_local $x8 (i32.xor (get_local $x8) (i32.rotl (i32.add (get_local $x11) (get_local $x10)) (i32.const 9))))
+        (set_local $x9 (i32.xor (get_local $x9) (i32.rotl (i32.add (get_local $x8) (get_local $x11)) (i32.const 13))))
+        (set_local $x10 (i32.xor (get_local $x10) (i32.rotl (i32.add (get_local $x9) (get_local $x8)) (i32.const 18))))
+        (set_local $x12 (i32.xor (get_local $x12) (i32.rotl (i32.add (get_local $x15) (get_local $x14)) (i32.const 7))))
+        (set_local $x13 (i32.xor (get_local $x13) (i32.rotl (i32.add (get_local $x12) (get_local $x15)) (i32.const 9))))
+        (set_local $x14 (i32.xor (get_local $x14) (i32.rotl (i32.add (get_local $x13) (get_local $x12)) (i32.const 13))))
+        (set_local $x15 (i32.xor (get_local $x15) (i32.rotl (i32.add (get_local $x14) (get_local $x13)) (i32.const 18))))
+        (set_local $i (i32.sub (get_local $i) (i32.const 2)))
+        (br $start_loop)
+      )
+    )
+
+    (i32.store (get_local $out_ptr) (get_local $x0))
+    (i32.store (i32.add (get_local $out_ptr) (i32.const 4)) (get_local $x5))
+    (i32.store (i32.add (get_local $out_ptr) (i32.const 8)) (get_local $x10))
+    (i32.store (i32.add (get_local $out_ptr) (i32.const 12)) (get_local $x15))
+    (i32.store (i32.add (get_local $out_ptr) (i32.const 16)) (get_local $x6))
+    (i32.store (i32.add (get_local $out_ptr) (i32.const 20)) (get_local $x7))
+    (i32.store (i32.add (get_local $out_ptr) (i32.const 24)) (get_local $x8))
+    (i32.store (i32.add (get_local $out_ptr) (i32.const 28)) (get_local $x9))
+  )
+)