var test = require('tape')
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var crypto = require('../')
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var randomBytesFunctions = {
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randomBytes: require('randombytes'),
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pseudoRandomBytes: crypto.pseudoRandomBytes
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}
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for (var randomBytesName in randomBytesFunctions) {
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// Both randomBytes and pseudoRandomBytes should provide the same interface
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var randomBytes = randomBytesFunctions[randomBytesName]
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test('get error message', function (t) {
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try {
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var b = randomBytes(10)
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t.ok(Buffer.isBuffer(b))
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t.end()
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} catch (err) {
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t.ok(/not supported/.test(err.message), '"not supported" is in error message')
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t.end()
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}
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})
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test(randomBytesName, function (t) {
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t.plan(5)
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t.equal(randomBytes(10).length, 10)
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t.ok(Buffer.isBuffer(randomBytes(10)))
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randomBytes(10, function (ex, bytes) {
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t.error(ex)
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t.equal(bytes.length, 10)
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t.ok(Buffer.isBuffer(bytes))
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t.end()
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})
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})
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test(randomBytesName + ' seem random', function (t) {
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var L = 1000
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var b = randomBytes(L)
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var mean = [].reduce.call(b, function (a, b) { return a + b }, 0) / L
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// test that the random numbers are plausably random.
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// Math.random() will pass this, but this will catch
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// terrible mistakes such as this blunder:
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// https://github.com/dominictarr/crypto-browserify/commit/3267955e1df7edd1680e52aeede9a89506ed2464#commitcomment-7916835
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// this doesn't check that the bytes are in a random *order*
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// but it's better than nothing.
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var expected = 256 / 2
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var smean = Math.sqrt(mean)
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// console.log doesn't work right on testling, *grumble grumble*
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console.log(JSON.stringify([expected - smean, mean, expected + smean]))
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t.ok(mean < expected + smean)
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t.ok(mean > expected - smean)
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t.end()
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})
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}
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