siphash: add siphash32 and siphash64.

lib/crypto/siphash.js

@@ -16,14 +16,15 @@
 const native = require('../native').binding;
 
 /**
- * Javascript siphash implementation. Used for compact block relay.
+ * Javascript siphash 2-4 implementation.
- * @alias module:crypto/siphash.siphash24
+ * @private
  * @param {Buffer} data
  * @param {Buffer} key - 128 bit key.
+ * @param {Number} shift
  * @returns {Array} [hi, lo]
  */
 
-function siphash24(data, key, shift) {
+function _siphash(data, key, shift) {
   const blocks = Math.floor(data.length / 8);
   const c0 = U64(0x736f6d65, 0x70736575);
   const c1 = U64(0x646f7261, 0x6e646f6d);
@@ -85,30 +86,50 @@ function siphash24(data, key, shift) {
   return [v0.hi, v0.lo];
 }
 
-function sipround(v0, v1, v2, v3) {
+/**
-  v0.iadd(v1);
+ * Javascript siphash 2-4 implementation (64 bit ints).
-  v1.irotl(13);
+ * @private
-  v1.ixor(v0);
+ * @param {Number} hi
+ * @param {Number} lo
+ * @param {Buffer} key - 128 bit key.
+ * @returns {Array} [hi, lo]
+ */
 
-  v0.irotl(32);
+function _siphash64(hi, lo, key) {
+  const c0 = U64(0x736f6d65, 0x70736575);
+  const c1 = U64(0x646f7261, 0x6e646f6d);
+  const c2 = U64(0x6c796765, 0x6e657261);
+  const c3 = U64(0x74656462, 0x79746573);
+  const f0 = U64(hi, lo);
+  const f1 = U64(0, 0xff);
+  const k0 = U64.fromRaw(key, 0);
+  const k1 = U64.fromRaw(key, 8);
 
-  v2.iadd(v3);
+  // Init
-  v3.irotl(16);
+  const v0 = c0.ixor(k0);
-  v3.ixor(v2);
+  const v1 = c1.ixor(k1);
+  const v2 = c2.ixor(k0);
+  const v3 = c3.ixor(k1);
 
-  v0.iadd(v3);
+  // Finalization
-  v3.irotl(21);
+  v3.ixor(f0);
-  v3.ixor(v0);
+  sipround(v0, v1, v2, v3);
+  sipround(v0, v1, v2, v3);
+  v0.ixor(f0);
+  v2.ixor(f1);
+  sipround(v0, v1, v2, v3);
+  sipround(v0, v1, v2, v3);
+  sipround(v0, v1, v2, v3);
+  sipround(v0, v1, v2, v3);
+  v0.ixor(v1);
+  v0.ixor(v2);
+  v0.ixor(v3);
 
-  v2.iadd(v1);
+  return [v0.hi, v0.lo];
-  v1.irotl(17);
-  v1.ixor(v2);
-
-  v2.irotl(32);
 }
 
 /**
- * Javascript siphash implementation (shift=56).
+ * Javascript siphash 2-4 implementation (shift=56).
  * @alias module:crypto/siphash.siphash
  * @param {Buffer} data
  * @param {Buffer} key - 128 bit key.
@@ -116,11 +137,11 @@ function sipround(v0, v1, v2, v3) {
  */
 
 function siphash(data, key) {
-  return siphash24(data, key, 56);
+  return _siphash(data, key, 56);
 }
 
 /**
- * Javascript siphash implementation (shift=59).
+ * Javascript siphash 2-4 implementation (shift=59).
  * @alias module:crypto/siphash.siphash256
  * @param {Buffer} data
  * @param {Buffer} key - 128 bit key.
@@ -128,12 +149,39 @@ function siphash(data, key) {
  */
 
 function siphash256(data, key) {
-  return siphash24(data, key, 59);
+  return _siphash(data, key, 59);
+}
+
+/**
+ * Javascript siphash 2-4 implementation (32 bit ints).
+ * @alias module:crypto/siphash.siphash32
+ * @param {Number} num
+ * @param {Buffer} key - 128 bit key.
+ * @returns {Number}
+ */
+
+function siphash32(num, key) {
+  return _siphash64(0, num, key)[1];
+}
+
+/**
+ * Javascript siphash 2-4 implementation (64 bit ints).
+ * @alias module:crypto/siphash.siphash64
+ * @param {Number} hi
+ * @param {Number} lo
+ * @param {Buffer} key - 128 bit key.
+ * @returns {Array} [hi, lo]
+ */
+
+function siphash64(hi, lo, key) {
+  return _siphash64(hi, lo, key);
 }
 
 if (native) {
   siphash = native.siphash;
   siphash256 = native.siphash256;
+  siphash32 = native.siphash32;
+  siphash64 = native.siphash64;
 }
 
 /*
@@ -217,6 +265,32 @@ U64.fromRaw = function fromRaw(data, off) {
   return new U64(hi, lo);
 };
 
+/*
+ * Helpers
+ */
+
+function sipround(v0, v1, v2, v3) {
+  v0.iadd(v1);
+  v1.irotl(13);
+  v1.ixor(v0);
+
+  v0.irotl(32);
+
+  v2.iadd(v3);
+  v3.irotl(16);
+  v3.ixor(v2);
+
+  v0.iadd(v3);
+  v3.irotl(21);
+  v3.ixor(v0);
+
+  v2.iadd(v1);
+  v1.irotl(17);
+  v1.ixor(v2);
+
+  v2.irotl(32);
+}
+
 /*
  * Expose
  */
@@ -224,5 +298,7 @@ U64.fromRaw = function fromRaw(data, off) {
 exports = siphash;
 exports.siphash = siphash;
 exports.siphash256 = siphash256;
+exports.siphash32 = siphash32;
+exports.siphash64 = siphash64;
 
 module.exports = exports;