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cryptography-random/test/sources/common/CryptographyRandomTest.kt
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package dev.whyoleg.cryptography.random | ||
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import kotlin.math.* | ||
import kotlin.test.* | ||
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class CryptographyRandomTest { | ||
@Test | ||
fun testInt() { | ||
assertNotEquals(CryptographyRandom.nextInt(), CryptographyRandom.nextInt()) | ||
} | ||
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@Test | ||
fun test65536() { | ||
//WebCrypto specific test - improve it somehow? | ||
assertTrue(CryptographyRandom.nextBytes(65535).any { it != 0.toByte() }) | ||
assertTrue(CryptographyRandom.nextBytes(65536).any { it != 0.toByte() }) | ||
assertTrue(CryptographyRandom.nextBytes(65537).any { it != 0.toByte() }) | ||
} | ||
class DefaultRandomTest : CryptographyRandomTest(CryptographyRandom.Default) | ||
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abstract class CryptographyRandomTest(private val random: CryptographyRandom) { | ||
@Test | ||
fun testArray() { | ||
repeat(8) { n -> | ||
val size = 10.0.pow(n).toInt() | ||
val array = CryptographyRandom.nextBytes(size) | ||
assertTrue(array.any { it != 0.toByte() }) | ||
assertEquals(size, array.size) | ||
} | ||
fun testInt() { | ||
assertNotEquals(random.nextInt(), random.nextInt()) | ||
} | ||
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@Test | ||
fun testEmpty() { | ||
assertTrue(CryptographyRandom.nextBytes(0).isEmpty()) | ||
assertTrue(CryptographyRandom.nextBytes(ByteArray(0)).isEmpty()) | ||
assertTrue(random.nextBytes(0).isEmpty()) | ||
assertTrue(random.nextBytes(ByteArray(0)).isEmpty()) | ||
} | ||
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@Test | ||
fun testInPlace() { | ||
val bytes = ByteArray(10) { it.toByte() } | ||
bytes.copyOf().also { copy -> | ||
assertContentEquals(bytes, copy) | ||
assertFalse(bytes.contentEquals(CryptographyRandom.nextBytes(copy))) | ||
val inPlace = random.nextBytes(copy) | ||
assertContentEquals(inPlace, copy) | ||
assertFalse(bytes.contentEquals(inPlace)) | ||
assertFalse(bytes.contentEquals(copy)) | ||
} | ||
bytes.copyOf().also { copy -> | ||
assertContentEquals(bytes, CryptographyRandom.nextBytes(copy, 5, 5)) | ||
val inPlace = random.nextBytes(copy, 5, 5) | ||
assertContentEquals(inPlace, copy) | ||
assertContentEquals(bytes, inPlace) | ||
assertContentEquals(bytes, copy) | ||
} | ||
bytes.copyOf().also { copy -> | ||
assertFalse(bytes.contentEquals(CryptographyRandom.nextBytes(copy, 0, 5))) | ||
val inPlace = random.nextBytes(copy, 0, 5) | ||
assertContentEquals(inPlace, copy) | ||
assertFalse(bytes.contentEquals(inPlace)) | ||
assertFalse(bytes.contentEquals(copy)) | ||
} | ||
} | ||
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@Test | ||
fun testComposite() { | ||
fun targetValues(value: Int): List<Int> = buildList { | ||
fun addLocal(value: Int) { | ||
add(value) | ||
add(value + 1) | ||
add(value - 1) | ||
} | ||
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addLocal(value) | ||
(2..8).forEach { split -> | ||
val div = value / split | ||
val multi = value * split | ||
addLocal(value) | ||
addLocal(div) | ||
addLocal(multi) | ||
addLocal(multi - div) | ||
} | ||
} | ||
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val sizes = listOf( | ||
32, //min jdk native prng chunk | ||
256, //linux chunk | ||
512, | ||
4096, | ||
65536, //webcrypto chunk | max jdk native prng chunk | ||
1000000, // 1 MB | ||
1048576, // 1 MiB (via targetValues will test values up to 8 MiB) | ||
).flatMap(::targetValues).distinct().sorted() | ||
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sizes.forEach { size -> | ||
val bytes = random.nextBytes(size) | ||
val refillBytes = random.nextBytes(bytes.copyOf()) | ||
assertEquals(bytes.size, size) | ||
assertEquals(refillBytes.size, size) | ||
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var nonEmptyCount = 0 | ||
var changedCount = 0 | ||
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repeat(size) { | ||
val original = bytes[it] | ||
val changed = refillBytes[it] | ||
if (original != 0.toByte()) ++nonEmptyCount | ||
if (original != changed) ++changedCount | ||
} | ||
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val nonEmptyProb = 1.0 - nonEmptyCount.toDouble() / size | ||
val changedProb = 1.0 - changedCount.toDouble() / size | ||
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// empirical values | ||
val tolerance = when { | ||
size < 4 -> 0.7 | ||
size < 6 -> 0.5 | ||
size < 20 -> 0.3 | ||
size < 50 -> 0.2 | ||
size < 100 -> 0.1 | ||
size < 200 -> 0.05 | ||
size < 500 -> 0.03 | ||
size < 1000 -> 0.025 | ||
size < 5000 -> 0.02 | ||
size < 10000 -> 0.01 | ||
size < 100000 -> 0.0075 | ||
else -> 0.005 | ||
} | ||
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assertEquals(0.0, nonEmptyProb, tolerance, "size=$size EMPTY diff = $nonEmptyProb") | ||
assertEquals(0.0, changedProb, tolerance, "size=$size CHANGED diff = $changedProb") | ||
} | ||
} | ||
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} |