39 lines
1.2 KiB
TypeScript
39 lines
1.2 KiB
TypeScript
/**
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* An **HMAC** enables verification that a given key was used
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* to authenticate a payload.
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*
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* See: [[link-wiki-hmac]]
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*
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* @_subsection: api/crypto:HMAC [about-hmac]
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*/
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import { createHmac } from "./crypto.js";
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import { getBytes, hexlify } from "../utils/index.js";
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import type { BytesLike } from "../utils/index.js";
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let locked = false;
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const _computeHmac = function(algorithm: "sha256" | "sha512", key: Uint8Array, data: Uint8Array): BytesLike {
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return createHmac(algorithm, key).update(data).digest();
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}
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let __computeHmac = _computeHmac;
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/**
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* Return the HMAC for %%data%% using the %%key%% key with the underlying
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* %%algo%% used for compression.
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*/
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export function computeHmac(algorithm: "sha256" | "sha512", _key: BytesLike, _data: BytesLike): string {
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const key = getBytes(_key, "key");
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const data = getBytes(_data, "data");
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return hexlify(__computeHmac(algorithm, key, data));
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}
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computeHmac._ = _computeHmac;
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computeHmac.lock = function() { locked = true; }
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computeHmac.register = function(func: (algorithm: "sha256" | "sha512", key: Uint8Array, data: Uint8Array) => BytesLike) {
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if (locked) { throw new Error("computeHmac is locked"); }
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__computeHmac = func;
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}
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Object.freeze(computeHmac);
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