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crypto: improve ccmp.

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This commit is contained in:
Christopher Jeffrey 2016-07-31 20:18:29 -07:00
parent 104458a483
commit 1d971b0de0
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GPG Key ID: 8962AB9DE6666BBD
1 changed files with 6 additions and 7 deletions
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13
lib/bcoin/crypto.js
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@ -400,8 +400,7 @@ crypto.hkdfExpand = function hkdfExpand(prk, info, len, alg) {
*/
crypto.ccmp = function ccmp(a, b) {
var res = 0;
var i;
var i, res;
if (!Buffer.isBuffer(a))
return false;
@ -409,13 +408,13 @@ crypto.ccmp = function ccmp(a, b) {
if (!Buffer.isBuffer(b))
return false;
// It's assumed the target length
// would be known to an attacker anyway.
if (a.length !== b.length)
return false;
if (b.length === 0)
return a.length === 0;
res = a.length ^ b.length;
for (i = 0; i < a.length; i++)
res |= a[i] ^ b[i];
res |= a[i] ^ b[i % b.length];
return res === 0;
};