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60 lines
1.7 KiB
60 lines
1.7 KiB
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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