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'use strict' var inherits = require('inherits') var Legacy = require('./legacy') var Base = require('cipher-base') var Buffer = require('safe-buffer').Buffer var md5 = require('create-hash/md5') var RIPEMD160 = require('ripemd160') var sha = require('sha.js') var ZEROS = Buffer.alloc(128) function Hmac (alg, key) { Base.call(this, 'digest') if (typeof key === 'string') { key = Buffer.from(key) } var blocksize = (alg === 'sha512' || alg === 'sha384') ? 128 : 64 this._alg = alg this._key = key if (key.length > blocksize) { var hash = alg === 'rmd160' ? new RIPEMD160() : sha(alg) key = hash.update(key).digest() } 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 = alg === 'rmd160' ? new RIPEMD160() : sha(alg) this._hash.update(ipad) } inherits(Hmac, Base) Hmac.prototype._update = function (data) { this._hash.update(data) } Hmac.prototype._final = function () { var h = this._hash.digest() var hash = this._alg === 'rmd160' ? new RIPEMD160() : sha(this._alg) return hash.update(this._opad).update(h).digest() } module.exports = function createHmac (alg, key) { alg = alg.toLowerCase() if (alg === 'rmd160' || alg === 'ripemd160') { return new Hmac('rmd160', key) } if (alg === 'md5') { return new Legacy(md5, key) } return new Hmac(alg, key) }