52 lines
1.9 KiB
Plaintext
52 lines
1.9 KiB
Plaintext
import { sha256 } from "./crypto.js";
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//#region src/utils/buffer.ts
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/**
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* @module
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* Buffer utility.
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*/
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const equal = (a, b) => {
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if (a === b) return true;
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if (a.byteLength !== b.byteLength) return false;
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const va = new DataView(a);
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const vb = new DataView(b);
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let i = va.byteLength;
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while (i--) if (va.getUint8(i) !== vb.getUint8(i)) return false;
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return true;
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};
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const constantTimeEqualString = (a, b) => {
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const aLen = a.length;
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const bLen = b.length;
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const maxLen = Math.max(aLen, bLen);
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let out = aLen ^ bLen;
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for (let i = 0; i < maxLen; i++) {
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const aChar = i < aLen ? a.charCodeAt(i) : 0;
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const bChar = i < bLen ? b.charCodeAt(i) : 0;
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out |= aChar ^ bChar;
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}
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return out === 0;
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};
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const timingSafeEqualString = async (a, b, hashFunction) => {
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if (!hashFunction) hashFunction = sha256;
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const [sa, sb] = await Promise.all([hashFunction(a), hashFunction(b)]);
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if (sa == null || sb == null || typeof sa !== "string" || typeof sb !== "string") return false;
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const hashEqual = constantTimeEqualString(sa, sb);
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const originalEqual = constantTimeEqualString(a, b);
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return hashEqual && originalEqual;
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};
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const timingSafeEqual = async (a, b, hashFunction) => {
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if (typeof a === "string" && typeof b === "string") return timingSafeEqualString(a, b, hashFunction);
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if (!hashFunction) hashFunction = sha256;
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const [sa, sb] = await Promise.all([hashFunction(a), hashFunction(b)]);
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if (!sa || !sb || typeof sa !== "string" || typeof sb !== "string") return false;
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return timingSafeEqualString(sa, sb);
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};
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const bufferToString = (buffer) => {
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if (buffer instanceof ArrayBuffer) return new TextDecoder("utf-8").decode(buffer);
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return buffer;
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};
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const bufferToFormData = (arrayBuffer, contentType) => {
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return new Response(arrayBuffer, { headers: { "Content-Type": contentType.replace(/^[^;]+/, (mediaType) => mediaType.toLowerCase()) } }).formData();
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};
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//#endregion
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export { bufferToFormData, bufferToString, equal, timingSafeEqual };
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