53 lines
1.0 KiB
JavaScript
53 lines
1.0 KiB
JavaScript
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'use strict';
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var inherits = require('inherits')
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var md5 = require('./md5')
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var rmd160 = require('ripemd160')
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var sha = require('sha.js')
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var Base = require('cipher-base')
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function HashNoConstructor(hash) {
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Base.call(this, 'digest')
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this._hash = hash
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this.buffers = []
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}
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inherits(HashNoConstructor, Base)
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HashNoConstructor.prototype._update = function (data) {
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this.buffers.push(data)
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}
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HashNoConstructor.prototype._final = function () {
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var buf = Buffer.concat(this.buffers)
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var r = this._hash(buf)
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this.buffers = null
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return r
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}
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function Hash(hash) {
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Base.call(this, 'digest')
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this._hash = hash
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}
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inherits(Hash, Base)
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Hash.prototype._update = function (data) {
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this._hash.update(data)
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}
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Hash.prototype._final = function () {
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return this._hash.digest()
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}
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module.exports = function createHash (alg) {
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alg = alg.toLowerCase()
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if ('md5' === alg) return new HashNoConstructor(md5)
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if ('rmd160' === alg || 'ripemd160' === alg) return new HashNoConstructor(rmd160)
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return new Hash(sha(alg))
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}
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