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bip151: 32 bit sequence and 64 bit iv.

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This commit is contained in:
Christopher Jeffrey 2016-07-27 04:06:05 -07:00
parent db0552874b
commit 6a2615d3cc
No known key found for this signature in database
GPG Key ID: 8962AB9DE6666BBD
1 changed files with 6 additions and 12 deletions
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18
lib/bcoin/bip151.js
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@ -70,9 +70,8 @@ function BIP151Stream(cipher, key) {
this.chacha = new chachapoly.ChaCha20();
this.aead = new chachapoly.AEAD();
this.tag = null;
this.seqHi = 0;
this.seqLo = 0;
this.iv = new Buffer(12);
this.seq = 0;
this.iv = new Buffer(8);
this.iv.fill(0);
this.highWaterMark = 1024 * (1 << 20);
@ -106,8 +105,7 @@ BIP151Stream.prototype.init = function init(publicKey) {
this.k2 = utils.hkdfExpand(this.prk, INFO_KEY2, 32, 'sha256');
this.sid = utils.hkdfExpand(this.prk, INFO_SID, 32, 'sha256');
this.seqHi = 0;
this.seqLo = 0;
this.seq = 0;
this.update();
@ -163,11 +161,8 @@ BIP151Stream.prototype.rekey = function rekey() {
BIP151Stream.prototype.sequence = function sequence() {
// Wrap sequence number a la openssh.
if (++this.seqLo === 0x100000000) {
this.seqLo = 0;
if (++this.seqHi === 0x100000000)
this.seqHi = 0;
}
if (++this.seq === 0x100000000)
this.seq = 0;
this.update();
@ -183,8 +178,7 @@ BIP151Stream.prototype.sequence = function sequence() {
*/
BIP151Stream.prototype.update = function update() {
this.iv.writeUInt32LE(this.seqLo, 0, true);
this.iv.writeUInt32LE(this.seqHi, 4, true);
this.iv.writeUInt32LE(this.seq, 4, true);
return this.iv;
};