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bip151: use 64 bit sequence numbers for now.

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This commit is contained in:
Christopher Jeffrey 2016-07-27 01:08:50 -07:00
parent 6720ecc2c8
commit 208394596e
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GPG Key ID: 8962AB9DE6666BBD
1 changed files with 12 additions and 8 deletions
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20
lib/bcoin/bip151.js
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@ -70,7 +70,8 @@ function BIP151Stream(cipher, key) {
this.chacha = new chachapoly.ChaCha20();
this.aead = new chachapoly.AEAD();
this.tag = null;
this.seq = 0;
this.seqHi = 0;
this.seqLo = 0;
this.highWaterMark = 1024 * (1 << 20);
this.processed = 0;
@ -106,7 +107,8 @@ 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.seq = 0;
this.seqHi = 0;
this.seqLo = 0;
this.chacha.init(this.k1, this.iv());
this.aead.init(this.k2, this.iv());
@ -153,17 +155,18 @@ BIP151Stream.prototype.rekey = function rekey() {
/**
* Increment packet sequence number and update IVs
* (note, sequence number overflows after 2^32-1).
* (note, sequence number overflows after 2^64-1).
* The IV will be updated without reinitializing
* cipher state.
*/
BIP151Stream.prototype.sequence = function sequence() {
this.seq++;
// Wrap sequence number a la openssh.
if (this.seq === 0x100000000)
this.seq = 0;
if (++this.seqLo === 0x100000000) {
this.seqLo = 0;
if (++this.seqHi === 0x100000000)
this.seqHi = 0;
}
// State of the ciphers is
// unaltered aside from the iv.
@ -178,7 +181,8 @@ BIP151Stream.prototype.sequence = function sequence() {
BIP151Stream.prototype.iv = function iv() {
var p = bcoin.writer();
p.writeU64(this.seq);
p.writeU32(this.seqLo);
p.writeU32(this.seqHi);
p.writeU32(0);
return p.render();
};