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'use strict' var inherits = require('inherits') var Buffer = require('safe-buffer').Buffer var Base = require('cipher-base') var ZEROS = Buffer.alloc(128) var blocksize = 64 function Hmac (alg, key) { Base.call(this, 'digest') if (typeof key === 'string') { key = Buffer.from(key) } this._alg = alg this._key = key if (key.length > blocksize) { key = alg(key) } else if (key.length < blocksize) { key = Buffer.concat([key, ZEROS], blocksize) } var ipad = this._ipad = Buffer.allocUnsafe(blocksize) var opad = this._opad = Buffer.allocUnsafe(blocksize) for (var i = 0; i < blocksize; i++) { ipad[i] = key[i] ^ 0x36 opad[i] = key[i] ^ 0x5C } this._hash = [ipad] } inherits(Hmac, Base) Hmac.prototype._update = function (data) { this._hash.push(data) } Hmac.prototype._final = function () { var h = this._alg(Buffer.concat(this._hash)) return this._alg(Buffer.concat([this._opad, h])) } module.exports = Hmac