json-q
Version:
Retrieves values from JSON objects (and JavaScript objects) by css-selector-like query (includes attribute filters and array flattening).
28 lines • 668 B
JavaScript
var xor = require('../xor');
function getBlock(self) {
var out = self._cipher.encryptBlock(self._prev);
incr32(self._prev);
return out;
}
exports.encrypt = function (self, chunk) {
while (self._cache.length < chunk.length) {
self._cache = Buffer.concat([self._cache, getBlock(self)]);
}
var pad = self._cache.slice(0, chunk.length);
self._cache = self._cache.slice(chunk.length);
return xor(chunk, pad);
};
function incr32(iv) {
var len = iv.length;
var item;
while (len--) {
item = iv.readUInt8(len);
if (item === 255) {
iv.writeUInt8(0, len);
} else {
item++;
iv.writeUInt8(item, len);
break;
}
}
}