aaac7fed
 liuqimichale
add
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var test = require('tape')
var crypto = require('../')
var randomBytesFunctions = {
randomBytes: require('randombytes'),
pseudoRandomBytes: crypto.pseudoRandomBytes
}
for (var randomBytesName in randomBytesFunctions) {
// Both randomBytes and pseudoRandomBytes should provide the same interface
var randomBytes = randomBytesFunctions[randomBytesName]
test('get error message', function (t) {
try {
var b = randomBytes(10)
t.ok(Buffer.isBuffer(b))
t.end()
} catch (err) {
t.ok(/not supported/.test(err.message), '"not supported" is in error message')
t.end()
}
})
test(randomBytesName, function (t) {
t.plan(5)
t.equal(randomBytes(10).length, 10)
t.ok(Buffer.isBuffer(randomBytes(10)))
randomBytes(10, function (ex, bytes) {
t.error(ex)
t.equal(bytes.length, 10)
t.ok(Buffer.isBuffer(bytes))
t.end()
})
})
test(randomBytesName + ' seem random', function (t) {
var L = 1000
var b = randomBytes(L)
var mean = [].reduce.call(b, function (a, b) { return a + b }, 0) / L
// test that the random numbers are plausably random.
// Math.random() will pass this, but this will catch
// terrible mistakes such as this blunder:
// https://github.com/dominictarr/crypto-browserify/commit/3267955e1df7edd1680e52aeede9a89506ed2464#commitcomment-7916835
// this doesn't check that the bytes are in a random *order*
// but it's better than nothing.
var expected = 256 / 2
var smean = Math.sqrt(mean)
// console.log doesn't work right on testling, *grumble grumble*
console.log(JSON.stringify([expected - smean, mean, expected + smean]))
t.ok(mean < expected + smean)
t.ok(mean > expected - smean)
t.end()
})
}
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