| 1 | import { Buffer } from "node:buffer";
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| 2 | import { createHmac, timingSafeEqual } from "node:crypto";
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| 3 | function s2b(str, encoding) {
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| 4 | return Buffer.from(str, encoding);
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| 5 | }
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| 6 | function safeCompare(a, b) {
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| 7 | if (a.length !== b.length) {
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| 8 | return false;
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| 9 | }
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| 10 | return timingSafeEqual(a, b);
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| 11 | }
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| 12 | export default function validateSignature(body, channelSecret, signature) {
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| 13 | return safeCompare(createHmac("SHA256", channelSecret).update(body).digest(), s2b(signature, "base64"));
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| 14 | }
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| 15 | |
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