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denoland-deno/ext/node/polyfills/internal/crypto/_randomFill.ts
Levente Kurusa 65b0d2316d
refactor(node/crypto): port polyfill to Rust for randomInt, randomFill, randomFillSync (#18658)
Pretty much as per the title, I'd welcome some feedback especially
around the
array/buffer handling in the two randomFill functions.
2023-04-12 02:57:57 +02:00

90 lines
2.4 KiB
TypeScript

// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
import {
MAX_SIZE as kMaxUint32,
} from "ext:deno_node/internal/crypto/_randomBytes.ts";
import { Buffer } from "ext:deno_node/buffer.ts";
const { core } = globalThis.__bootstrap;
const { ops } = core;
const kBufferMaxLength = 0x7fffffff;
function assertOffset(offset: number, length: number) {
if (offset > kMaxUint32 || offset < 0) {
throw new TypeError("offset must be a uint32");
}
if (offset > kBufferMaxLength || offset > length) {
throw new RangeError("offset out of range");
}
}
function assertSize(size: number, offset: number, length: number) {
if (size > kMaxUint32 || size < 0) {
throw new TypeError("size must be a uint32");
}
if (size + offset > length || size > kBufferMaxLength) {
throw new RangeError("buffer too small");
}
}
export default function randomFill(
buf: Buffer,
cb: (err: Error | null, buf: Buffer) => void,
): void;
export default function randomFill(
buf: Buffer,
offset: number,
cb: (err: Error | null, buf: Buffer) => void,
): void;
export default function randomFill(
buf: Buffer,
offset: number,
size: number,
cb: (err: Error | null, buf: Buffer) => void,
): void;
export default function randomFill(
buf: Buffer,
offset?: number | ((err: Error | null, buf: Buffer) => void),
size?: number | ((err: Error | null, buf: Buffer) => void),
cb?: (err: Error | null, buf: Buffer) => void,
) {
if (typeof offset === "function") {
cb = offset;
offset = 0;
size = buf.length;
} else if (typeof size === "function") {
cb = size;
size = buf.length - Number(offset as number);
}
assertOffset(offset as number, buf.length);
assertSize(size as number, offset as number, buf.length);
core.opAsync("op_node_generate_secret_async", Math.floor(size as number))
.then(
(randomData: Uint8Array) => {
const randomBuf = Buffer.from(randomData.buffer);
randomBuf.copy(buf, offset as number, 0, size as number);
cb!(null, buf);
},
);
}
export function randomFillSync(buf: Buffer, offset = 0, size?: number) {
assertOffset(offset, buf.length);
if (size === undefined) size = buf.length - offset;
assertSize(size, offset, buf.length);
const bytes: Uint8Array = new Uint8Array(Math.floor(size));
ops.op_node_generate_secret(bytes);
const bytesBuf: Buffer = Buffer.from(bytes.buffer);
bytesBuf.copy(buf, offset, 0, size);
return buf;
}