diff options
Diffstat (limited to 'node_modules/hash-base/index.js')
-rw-r--r-- | node_modules/hash-base/index.js | 95 |
1 files changed, 0 insertions, 95 deletions
diff --git a/node_modules/hash-base/index.js b/node_modules/hash-base/index.js deleted file mode 100644 index bf788daa4..000000000 --- a/node_modules/hash-base/index.js +++ /dev/null @@ -1,95 +0,0 @@ -'use strict' -var Buffer = require('safe-buffer').Buffer -var Transform = require('stream').Transform -var inherits = require('inherits') - -function throwIfNotStringOrBuffer (val, prefix) { - if (!Buffer.isBuffer(val) && typeof val !== 'string') { - throw new TypeError(prefix + ' must be a string or a buffer') - } -} - -function HashBase (blockSize) { - Transform.call(this) - - this._block = Buffer.allocUnsafe(blockSize) - this._blockSize = blockSize - this._blockOffset = 0 - this._length = [0, 0, 0, 0] - - this._finalized = false -} - -inherits(HashBase, Transform) - -HashBase.prototype._transform = function (chunk, encoding, callback) { - var error = null - try { - this.update(chunk, encoding) - } catch (err) { - error = err - } - - callback(error) -} - -HashBase.prototype._flush = function (callback) { - var error = null - try { - this.push(this.digest()) - } catch (err) { - error = err - } - - callback(error) -} - -HashBase.prototype.update = function (data, encoding) { - throwIfNotStringOrBuffer(data, 'Data') - if (this._finalized) throw new Error('Digest already called') - if (!Buffer.isBuffer(data)) data = Buffer.from(data, encoding) - - // consume data - var block = this._block - var offset = 0 - while (this._blockOffset + data.length - offset >= this._blockSize) { - for (var i = this._blockOffset; i < this._blockSize;) block[i++] = data[offset++] - this._update() - this._blockOffset = 0 - } - while (offset < data.length) block[this._blockOffset++] = data[offset++] - - // update length - for (var j = 0, carry = data.length * 8; carry > 0; ++j) { - this._length[j] += carry - carry = (this._length[j] / 0x0100000000) | 0 - if (carry > 0) this._length[j] -= 0x0100000000 * carry - } - - return this -} - -HashBase.prototype._update = function () { - throw new Error('_update is not implemented') -} - -HashBase.prototype.digest = function (encoding) { - if (this._finalized) throw new Error('Digest already called') - this._finalized = true - - var digest = this._digest() - if (encoding !== undefined) digest = digest.toString(encoding) - - // reset state - this._block.fill(0) - this._blockOffset = 0 - for (var i = 0; i < 4; ++i) this._length[i] = 0 - - return digest -} - -HashBase.prototype._digest = function () { - throw new Error('_digest is not implemented') -} - -module.exports = HashBase |