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65b0d2316d
Pretty much as per the title, I'd welcome some feedback especially around the array/buffer handling in the two randomFill functions.
90 lines
2.4 KiB
TypeScript
90 lines
2.4 KiB
TypeScript
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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import {
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MAX_SIZE as kMaxUint32,
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} from "ext:deno_node/internal/crypto/_randomBytes.ts";
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import { Buffer } from "ext:deno_node/buffer.ts";
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const { core } = globalThis.__bootstrap;
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const { ops } = core;
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const kBufferMaxLength = 0x7fffffff;
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function assertOffset(offset: number, length: number) {
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if (offset > kMaxUint32 || offset < 0) {
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throw new TypeError("offset must be a uint32");
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}
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if (offset > kBufferMaxLength || offset > length) {
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throw new RangeError("offset out of range");
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}
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}
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function assertSize(size: number, offset: number, length: number) {
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if (size > kMaxUint32 || size < 0) {
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throw new TypeError("size must be a uint32");
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}
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if (size + offset > length || size > kBufferMaxLength) {
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throw new RangeError("buffer too small");
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}
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}
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export default function randomFill(
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buf: Buffer,
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cb: (err: Error | null, buf: Buffer) => void,
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): void;
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export default function randomFill(
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buf: Buffer,
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offset: number,
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cb: (err: Error | null, buf: Buffer) => void,
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): void;
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export default function randomFill(
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buf: Buffer,
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offset: number,
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size: number,
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cb: (err: Error | null, buf: Buffer) => void,
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): void;
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export default function randomFill(
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buf: Buffer,
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offset?: number | ((err: Error | null, buf: Buffer) => void),
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size?: number | ((err: Error | null, buf: Buffer) => void),
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cb?: (err: Error | null, buf: Buffer) => void,
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) {
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if (typeof offset === "function") {
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cb = offset;
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offset = 0;
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size = buf.length;
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} else if (typeof size === "function") {
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cb = size;
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size = buf.length - Number(offset as number);
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}
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assertOffset(offset as number, buf.length);
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assertSize(size as number, offset as number, buf.length);
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core.opAsync("op_node_generate_secret_async", Math.floor(size as number))
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.then(
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(randomData: Uint8Array) => {
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const randomBuf = Buffer.from(randomData.buffer);
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randomBuf.copy(buf, offset as number, 0, size as number);
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cb!(null, buf);
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},
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);
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}
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export function randomFillSync(buf: Buffer, offset = 0, size?: number) {
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assertOffset(offset, buf.length);
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if (size === undefined) size = buf.length - offset;
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assertSize(size, offset, buf.length);
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const bytes: Uint8Array = new Uint8Array(Math.floor(size));
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ops.op_node_generate_secret(bytes);
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const bytesBuf: Buffer = Buffer.from(bytes.buffer);
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bytesBuf.copy(buf, offset, 0, size);
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return buf;
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}
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