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101 changes: 101 additions & 0 deletions
101
secure-random/src/wasmJsMain/kotlin/org/kotlincrypto/SecureRandom.kt
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| /* | ||
| * Copyright (c) 2024 Matthew Nelson | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * https://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| **/ | ||
| @file:Suppress("ACTUAL_ANNOTATIONS_NOT_MATCH_EXPECT", "EXPECT_ACTUAL_CLASSIFIERS_ARE_IN_BETA_WARNING") | ||
|
|
||
| package org.kotlincrypto | ||
|
|
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| import org.khronos.webgl.Int8Array | ||
| import org.khronos.webgl.get | ||
| import org.khronos.webgl.set | ||
| import org.kotlincrypto.internal.commonNextBytesOf | ||
| import org.kotlincrypto.internal.ifNotNullOrEmpty | ||
|
|
||
| /** | ||
| * A cryptographically strong random number generator (RNG). | ||
| * */ | ||
| public actual class SecureRandom public actual constructor() { | ||
|
|
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| /** | ||
| * Returns a [ByteArray] of size [count], filled with | ||
| * securely generated random data. | ||
| * | ||
| * @throws [IllegalArgumentException] if [count] is negative. | ||
| * @throws [SecRandomCopyException] if [nextBytesCopyTo] failed. | ||
| * */ | ||
| public actual fun nextBytesOf(count: Int): ByteArray = commonNextBytesOf(count) | ||
|
|
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| /** | ||
| * Fills a [ByteArray] with securely generated random data. | ||
| * Does nothing if [bytes] is null or empty. | ||
| * | ||
| * - [docs-node](https://nodejs.org/api/crypto.html#cryptorandomfillsyncbuffer-offset-size) | ||
| * - [docs-browser](https://developer.mozilla.org/docs/Web/API/Crypto/getRandomValues) | ||
| * | ||
| * @throws [SecRandomCopyException] if procurement of securely random data failed. | ||
| * */ | ||
| public actual fun nextBytesCopyTo(bytes: ByteArray?) { | ||
| bytes.ifNotNullOrEmpty { | ||
| try { | ||
| val array = Int8Array(size) | ||
|
|
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| if (isNode) { | ||
| crypto.randomFillSync(array) | ||
| } else { | ||
| var offset = 0 | ||
| while (offset < size) { | ||
| val len = if (size > 65536) 65536 else size | ||
| crypto.getRandomValues(array.subarray(offset, offset + len)) | ||
| offset += len | ||
| } | ||
| } | ||
|
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| for (i in indices) { | ||
| this[i] = array[i] | ||
| array[i] = 0 | ||
| } | ||
| } catch (t: Throwable) { | ||
| throw SecRandomCopyException("Failed to obtain bytes", t) | ||
| } | ||
| } | ||
| } | ||
|
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| private companion object { | ||
| private val isNode: Boolean by lazy { isNodeJs() } | ||
| private val crypto: Crypto by lazy { if (isNode) cryptoNode() else cryptoBrowser() } | ||
| } | ||
| } | ||
|
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| private fun cryptoNode(): Crypto = js("eval('require')('crypto')") | ||
| private fun cryptoBrowser(): Crypto = js("(window ? (window.crypto ? window.crypto : window.msCrypto) : self.crypto)") | ||
|
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| private fun isNodeJs(): Boolean = js( | ||
| """ | ||
| (typeof process !== 'undefined' | ||
| && process.versions != null | ||
| && process.versions.node != null) || | ||
| (typeof window !== 'undefined' | ||
| && typeof window.process !== 'undefined' | ||
| && window.process.versions != null | ||
| && window.process.versions.node != null) | ||
| """ | ||
| ) | ||
|
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| private external class Crypto: JsAny { | ||
| // Browser | ||
| fun getRandomValues(array: Int8Array) | ||
| // Node.js | ||
| fun randomFillSync(array: Int8Array) | ||
| } |
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