�PNG  IHDR��;���IDATx��ܻn�0���K�� �)(�pA��� ���7�LeG{�� �§㻢|��ذaÆ 6lذaÆ 6lذaÆ 6lom��$^�y���ذag�5bÆ 6lذaÆ 6lذa{���� 6lذaÆ �`����}H�Fkm�,�m����Ӫ���ô�ô!� �x�|'ܢ˟;�E:���9�&ᶒ�}�{�v]�n&�6� �h��_��t�ڠ͵-ҫ���Z;��Z$�.�P���k�ž)�!��o���>}l�eQfJ�T��u і���چ��\��X=8��Rن4`Vw�l�>����n�G�^��i�s��"ms�$�u��i��?w�bs[m�6�K4���O���.�4��%����/����b�C%��t ��M�ז� �-l�G6�mrz2���s�%�9��s@���-�k�9�=���)������k�B5����\��+͂�Zsٲ ��Rn��~G���R���C����� �wIcI��n7jJ���hۛNCS|���j0��8y�iHKֶۛ�k�Ɉ+;Sz������L/��F�*\��Ԕ�#"5��m�2��[S��������=�g��n�a�P�e�ғ�L�� lذaÆ 6l�^k��̱aÆ 6lذaÆ 6lذa;���� �_��ذaÆ 6lذaÆ 6lذaÆ ���R���IEND�B` var AuthCipher = require('./authCipher') var Buffer = require('safe-buffer').Buffer var MODES = require('./modes') var StreamCipher = require('./streamCipher') var Transform = require('cipher-base') var aes = require('./aes') var ebtk = require('evp_bytestokey') var inherits = require('inherits') function Decipher (mode, key, iv) { Transform.call(this) this._cache = new Splitter() this._last = void 0 this._cipher = new aes.AES(key) this._prev = Buffer.from(iv) this._mode = mode this._autopadding = true } inherits(Decipher, Transform) Decipher.prototype._update = function (data) { this._cache.add(data) var chunk var thing var out = [] while ((chunk = this._cache.get(this._autopadding))) { thing = this._mode.decrypt(this, chunk) out.push(thing) } return Buffer.concat(out) } Decipher.prototype._final = function () { var chunk = this._cache.flush() if (this._autopadding) { return unpad(this._mode.decrypt(this, chunk)) } else if (chunk) { throw new Error('data not multiple of block length') } } Decipher.prototype.setAutoPadding = function (setTo) { this._autopadding = !!setTo return this } function Splitter () { this.cache = Buffer.allocUnsafe(0) } Splitter.prototype.add = function (data) { this.cache = Buffer.concat([this.cache, data]) } Splitter.prototype.get = function (autoPadding) { var out if (autoPadding) { if (this.cache.length > 16) { out = this.cache.slice(0, 16) this.cache = this.cache.slice(16) return out } } else { if (this.cache.length >= 16) { out = this.cache.slice(0, 16) this.cache = this.cache.slice(16) return out } } return null } Splitter.prototype.flush = function () { if (this.cache.length) return this.cache } function unpad (last) { var padded = last[15] if (padded < 1 || padded > 16) { throw new Error('unable to decrypt data') } var i = -1 while (++i < padded) { if (last[(i + (16 - padded))] !== padded) { throw new Error('unable to decrypt data') } } if (padded === 16) return return last.slice(0, 16 - padded) } function createDecipheriv (suite, password, iv) { var config = MODES[suite.toLowerCase()] if (!config) throw new TypeError('invalid suite type') if (typeof iv === 'string') iv = Buffer.from(iv) if (config.mode !== 'GCM' && iv.length !== config.iv) throw new TypeError('invalid iv length ' + iv.length) if (typeof password === 'string') password = Buffer.from(password) if (password.length !== config.key / 8) throw new TypeError('invalid key length ' + password.length) if (config.type === 'stream') { return new StreamCipher(config.module, password, iv, true) } else if (config.type === 'auth') { return new AuthCipher(config.module, password, iv, true) } return new Decipher(config.module, password, iv) } function createDecipher (suite, password) { var config = MODES[suite.toLowerCase()] if (!config) throw new TypeError('invalid suite type') var keys = ebtk(password, false, config.key, config.iv) return createDecipheriv(suite, keys.key, keys.iv) } exports.createDecipher = createDecipher exports.createDecipheriv = createDecipheriv