'use strict'
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function oldBrowser () {
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throw new Error('secure random number generation not supported by this browser\nuse chrome, FireFox or Internet Explorer 11')
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}
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var safeBuffer = require('safe-buffer')
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var randombytes = require('randombytes')
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var Buffer = safeBuffer.Buffer
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var kBufferMaxLength = safeBuffer.kMaxLength
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var crypto = global.crypto || global.msCrypto
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var kMaxUint32 = Math.pow(2, 32) - 1
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function assertOffset (offset, length) {
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if (typeof offset !== 'number' || offset !== offset) { // eslint-disable-line no-self-compare
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throw new TypeError('offset must be a number')
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}
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if (offset > kMaxUint32 || offset < 0) {
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throw new TypeError('offset must be a uint32')
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}
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if (offset > kBufferMaxLength || offset > length) {
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throw new RangeError('offset out of range')
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}
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}
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function assertSize (size, offset, length) {
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if (typeof size !== 'number' || size !== size) { // eslint-disable-line no-self-compare
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throw new TypeError('size must be a number')
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}
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if (size > kMaxUint32 || size < 0) {
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throw new TypeError('size must be a uint32')
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}
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if (size + offset > length || size > kBufferMaxLength) {
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throw new RangeError('buffer too small')
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}
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}
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if ((crypto && crypto.getRandomValues) || !process.browser) {
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exports.randomFill = randomFill
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exports.randomFillSync = randomFillSync
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} else {
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exports.randomFill = oldBrowser
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exports.randomFillSync = oldBrowser
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}
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function randomFill (buf, offset, size, cb) {
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if (!Buffer.isBuffer(buf) && !(buf instanceof global.Uint8Array)) {
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throw new TypeError('"buf" argument must be a Buffer or Uint8Array')
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}
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if (typeof offset === 'function') {
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cb = offset
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offset = 0
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size = buf.length
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} else if (typeof size === 'function') {
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cb = size
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size = buf.length - offset
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} else if (typeof cb !== 'function') {
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throw new TypeError('"cb" argument must be a function')
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}
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assertOffset(offset, buf.length)
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assertSize(size, offset, buf.length)
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return actualFill(buf, offset, size, cb)
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}
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function actualFill (buf, offset, size, cb) {
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if (process.browser) {
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var ourBuf = buf.buffer
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var uint = new Uint8Array(ourBuf, offset, size)
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crypto.getRandomValues(uint)
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if (cb) {
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process.nextTick(function () {
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cb(null, buf)
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})
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return
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}
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return buf
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}
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if (cb) {
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randombytes(size, function (err, bytes) {
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if (err) {
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return cb(err)
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}
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bytes.copy(buf, offset)
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cb(null, buf)
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})
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return
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}
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var bytes = randombytes(size)
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bytes.copy(buf, offset)
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return buf
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}
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function randomFillSync (buf, offset, size) {
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if (typeof offset === 'undefined') {
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offset = 0
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}
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if (!Buffer.isBuffer(buf) && !(buf instanceof global.Uint8Array)) {
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throw new TypeError('"buf" argument must be a Buffer or Uint8Array')
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}
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assertOffset(offset, buf.length)
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if (size === undefined) size = buf.length - offset
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assertSize(size, offset, buf.length)
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return actualFill(buf, offset, size)
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}
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