93 lines
2.3 KiB
JavaScript
93 lines
2.3 KiB
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
var utils = require('./utils');
|
||
|
|
var assert = require('minimalistic-assert');
|
||
|
|
|
||
|
|
function BlockHash() {
|
||
|
|
this.pending = null;
|
||
|
|
this.pendingTotal = 0;
|
||
|
|
this.blockSize = this.constructor.blockSize;
|
||
|
|
this.outSize = this.constructor.outSize;
|
||
|
|
this.hmacStrength = this.constructor.hmacStrength;
|
||
|
|
this.padLength = this.constructor.padLength / 8;
|
||
|
|
this.endian = 'big';
|
||
|
|
|
||
|
|
this._delta8 = this.blockSize / 8;
|
||
|
|
this._delta32 = this.blockSize / 32;
|
||
|
|
}
|
||
|
|
exports.BlockHash = BlockHash;
|
||
|
|
|
||
|
|
BlockHash.prototype.update = function update(msg, enc) {
|
||
|
|
// Convert message to array, pad it, and join into 32bit blocks
|
||
|
|
msg = utils.toArray(msg, enc);
|
||
|
|
if (!this.pending)
|
||
|
|
this.pending = msg;
|
||
|
|
else
|
||
|
|
this.pending = this.pending.concat(msg);
|
||
|
|
this.pendingTotal += msg.length;
|
||
|
|
|
||
|
|
// Enough data, try updating
|
||
|
|
if (this.pending.length >= this._delta8) {
|
||
|
|
msg = this.pending;
|
||
|
|
|
||
|
|
// Process pending data in blocks
|
||
|
|
var r = msg.length % this._delta8;
|
||
|
|
this.pending = msg.slice(msg.length - r, msg.length);
|
||
|
|
if (this.pending.length === 0)
|
||
|
|
this.pending = null;
|
||
|
|
|
||
|
|
msg = utils.join32(msg, 0, msg.length - r, this.endian);
|
||
|
|
for (var i = 0; i < msg.length; i += this._delta32)
|
||
|
|
this._update(msg, i, i + this._delta32);
|
||
|
|
}
|
||
|
|
|
||
|
|
return this;
|
||
|
|
};
|
||
|
|
|
||
|
|
BlockHash.prototype.digest = function digest(enc) {
|
||
|
|
this.update(this._pad());
|
||
|
|
assert(this.pending === null);
|
||
|
|
|
||
|
|
return this._digest(enc);
|
||
|
|
};
|
||
|
|
|
||
|
|
BlockHash.prototype._pad = function pad() {
|
||
|
|
var len = this.pendingTotal;
|
||
|
|
var bytes = this._delta8;
|
||
|
|
var k = bytes - ((len + this.padLength) % bytes);
|
||
|
|
var res = new Array(k + this.padLength);
|
||
|
|
res[0] = 0x80;
|
||
|
|
for (var i = 1; i < k; i++)
|
||
|
|
res[i] = 0;
|
||
|
|
|
||
|
|
// Append length
|
||
|
|
len <<= 3;
|
||
|
|
if (this.endian === 'big') {
|
||
|
|
for (var t = 8; t < this.padLength; t++)
|
||
|
|
res[i++] = 0;
|
||
|
|
|
||
|
|
res[i++] = 0;
|
||
|
|
res[i++] = 0;
|
||
|
|
res[i++] = 0;
|
||
|
|
res[i++] = 0;
|
||
|
|
res[i++] = (len >>> 24) & 0xff;
|
||
|
|
res[i++] = (len >>> 16) & 0xff;
|
||
|
|
res[i++] = (len >>> 8) & 0xff;
|
||
|
|
res[i++] = len & 0xff;
|
||
|
|
} else {
|
||
|
|
res[i++] = len & 0xff;
|
||
|
|
res[i++] = (len >>> 8) & 0xff;
|
||
|
|
res[i++] = (len >>> 16) & 0xff;
|
||
|
|
res[i++] = (len >>> 24) & 0xff;
|
||
|
|
res[i++] = 0;
|
||
|
|
res[i++] = 0;
|
||
|
|
res[i++] = 0;
|
||
|
|
res[i++] = 0;
|
||
|
|
|
||
|
|
for (t = 8; t < this.padLength; t++)
|
||
|
|
res[i++] = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
return res;
|
||
|
|
};
|