imba/polyfills/crypto/esm/lib/browserify-aes/modes/cfb.js

Intuitive and powerful language for building webapps that fly

import xor from "../../buffer-xor";
function encryptStart(self, data, decrypt) {
    var len = data.length;
    var out = xor(data, self._cache);
    self._cache = self._cache.slice(len);
    self._prev = Buffer.concat([self._prev, decrypt ? data : out]);
    return out;
}
export const encrypt = function (self, data, decrypt) {
    var out = Buffer.allocUnsafe(0);
    var len;
    while (data.length) {
        if (self._cache.length === 0) {
            self._cache = self._cipher.encryptBlock(self._prev);
            self._prev = Buffer.allocUnsafe(0);
        }
        if (self._cache.length <= data.length) {
            len = self._cache.length;
            out = Buffer.concat([out, encryptStart(self, data.slice(0, len), decrypt)]);
            data = data.slice(len);
        }
        else {
            out = Buffer.concat([out, encryptStart(self, data, decrypt)]);
            break;
        }
    }
    return out;
};