[Pkg-javascript-commits] [node-browserify-aes] 26/43: aes: inline SUB_MIX? lookups

[Bastien Roucariès]

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rouca pushed a commit to branch master
in repository node-browserify-aes.

commit 9cd250f5513be222ebcddb7d201f9162d8fe4fe0
Author: Daniel Cousens <github at dcousens.com>
Date:   Fri May 19 14:05:29 2017 +1000

    aes: inline SUB_MIX? lookups
---
 aes.js | 26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/aes.js b/aes.js
index 2f805de..4d60109 100644
--- a/aes.js
+++ b/aes.js
@@ -25,18 +25,23 @@ function scrubVec (v) {
 }
 
 function cryptBlock (M, keySchedule, SUB_MIX, SBOX, nRounds) {
+  var SUB_MIX0 = SUB_MIX[0]
+  var SUB_MIX1 = SUB_MIX[1]
+  var SUB_MIX2 = SUB_MIX[2]
+  var SUB_MIX3 = SUB_MIX[3]
+
   var s0 = M[0] ^ keySchedule[0]
   var s1 = M[1] ^ keySchedule[1]
   var s2 = M[2] ^ keySchedule[2]
   var s3 = M[3] ^ keySchedule[3]
+  var t0, t1, t2, t3
   var ksRow = 4
 
-  var t0, t1, t2, t3
   for (var round = 1; round < nRounds; round++) {
-    t0 = SUB_MIX[0][s0 >>> 24] ^ SUB_MIX[1][(s1 >>> 16) & 0xff] ^ SUB_MIX[2][(s2 >>> 8) & 0xff] ^ SUB_MIX[3][s3 & 0xff] ^ keySchedule[ksRow++]
-    t1 = SUB_MIX[0][s1 >>> 24] ^ SUB_MIX[1][(s2 >>> 16) & 0xff] ^ SUB_MIX[2][(s3 >>> 8) & 0xff] ^ SUB_MIX[3][s0 & 0xff] ^ keySchedule[ksRow++]
-    t2 = SUB_MIX[0][s2 >>> 24] ^ SUB_MIX[1][(s3 >>> 16) & 0xff] ^ SUB_MIX[2][(s0 >>> 8) & 0xff] ^ SUB_MIX[3][s1 & 0xff] ^ keySchedule[ksRow++]
-    t3 = SUB_MIX[0][s3 >>> 24] ^ SUB_MIX[1][(s0 >>> 16) & 0xff] ^ SUB_MIX[2][(s1 >>> 8) & 0xff] ^ SUB_MIX[3][s2 & 0xff] ^ keySchedule[ksRow++]
+    t0 = SUB_MIX0[s0 >>> 24] ^ SUB_MIX1[(s1 >>> 16) & 0xff] ^ SUB_MIX2[(s2 >>> 8) & 0xff] ^ SUB_MIX3[s3 & 0xff] ^ keySchedule[ksRow++]
+    t1 = SUB_MIX0[s1 >>> 24] ^ SUB_MIX1[(s2 >>> 16) & 0xff] ^ SUB_MIX2[(s3 >>> 8) & 0xff] ^ SUB_MIX3[s0 & 0xff] ^ keySchedule[ksRow++]
+    t2 = SUB_MIX0[s2 >>> 24] ^ SUB_MIX1[(s3 >>> 16) & 0xff] ^ SUB_MIX2[(s0 >>> 8) & 0xff] ^ SUB_MIX3[s1 & 0xff] ^ keySchedule[ksRow++]
+    t3 = SUB_MIX0[s3 >>> 24] ^ SUB_MIX1[(s0 >>> 16) & 0xff] ^ SUB_MIX2[(s1 >>> 8) & 0xff] ^ SUB_MIX3[s2 & 0xff] ^ keySchedule[ksRow++]
     s0 = t0
     s1 = t1
     s2 = t2
@@ -47,13 +52,12 @@ function cryptBlock (M, keySchedule, SUB_MIX, SBOX, nRounds) {
   t1 = ((SBOX[s1 >>> 24] << 24) | (SBOX[(s2 >>> 16) & 0xff] << 16) | (SBOX[(s3 >>> 8) & 0xff] << 8) | SBOX[s0 & 0xff]) ^ keySchedule[ksRow++]
   t2 = ((SBOX[s2 >>> 24] << 24) | (SBOX[(s3 >>> 16) & 0xff] << 16) | (SBOX[(s0 >>> 8) & 0xff] << 8) | SBOX[s1 & 0xff]) ^ keySchedule[ksRow++]
   t3 = ((SBOX[s3 >>> 24] << 24) | (SBOX[(s0 >>> 16) & 0xff] << 16) | (SBOX[(s1 >>> 8) & 0xff] << 8) | SBOX[s2 & 0xff]) ^ keySchedule[ksRow++]
+  t0 = t0 >>> 0
+  t1 = t1 >>> 0
+  t2 = t2 >>> 0
+  t3 = t3 >>> 0
 
-  return [
-    t0 >>> 0,
-    t1 >>> 0,
-    t2 >>> 0,
-    t3 >>> 0
-  ]
+  return [t0, t1, t2, t3]
 }
 
 // AES constants

-- 
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