38 lines
1.2 KiB
TypeScript
38 lines
1.2 KiB
TypeScript
import config from "./config.ts";
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import { hex } from "../deps.ts";
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export const hasKey = !!config.signKey;
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const encoder = new TextEncoder();
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let _signKey: CryptoKey | undefined = undefined;
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async function getKey(): Promise<CryptoKey> {
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if (_signKey === undefined) {
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if (!config.signKey) throw new Error("Signature requested but no key configured");
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_signKey = await crypto.subtle.importKey(
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"raw",
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hex.decode(new TextEncoder().encode(config.signKey)),
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{ name: "HMAC", hash: "SHA-256" },
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false,
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["sign", "verify"],
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);
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}
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return _signKey;
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}
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export async function sign(input: string): Promise<string> {
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const key = await getKey();
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const inputData = encoder.encode(input);
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const sig = await crypto.subtle.sign("HMAC", key, inputData);
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return new TextDecoder().decode(hex.encode(new Uint8Array(sig)));
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}
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export async function verify(input: string, signature: string): Promise<boolean> {
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const key = await getKey();
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const signatureData = hex.decode(encoder.encode(signature));
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const inputData = encoder.encode(input);
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return await crypto.subtle.verify("HMAC", key, signatureData, inputData);
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}
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