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node_modules/@noble/hashes/src/hmac.ts

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+import { hash as assertHash, bytes as assertBytes, exists as assertExists } from './_assert.js';
+import { Hash, CHash, Input, toBytes } from './utils.js';
+// HMAC (RFC 2104)
+export class HMAC<T extends Hash<T>> extends Hash<HMAC<T>> {
+  oHash: T;
+  iHash: T;
+  blockLen: number;
+  outputLen: number;
+  private finished = false;
+  private destroyed = false;
+
+  constructor(hash: CHash, _key: Input) {
+    super();
+    assertHash(hash);
+    const key = toBytes(_key);
+    this.iHash = hash.create() as T;
+    if (typeof this.iHash.update !== 'function')
+      throw new Error('Expected instance of class which extends utils.Hash');
+    this.blockLen = this.iHash.blockLen;
+    this.outputLen = this.iHash.outputLen;
+    const blockLen = this.blockLen;
+    const pad = new Uint8Array(blockLen);
+    // blockLen can be bigger than outputLen
+    pad.set(key.length > blockLen ? hash.create().update(key).digest() : key);
+    for (let i = 0; i < pad.length; i++) pad[i] ^= 0x36;
+    this.iHash.update(pad);
+    // By doing update (processing of first block) of outer hash here we can re-use it between multiple calls via clone
+    this.oHash = hash.create() as T;
+    // Undo internal XOR && apply outer XOR
+    for (let i = 0; i < pad.length; i++) pad[i] ^= 0x36 ^ 0x5c;
+    this.oHash.update(pad);
+    pad.fill(0);
+  }
+  update(buf: Input) {
+    assertExists(this);
+    this.iHash.update(buf);
+    return this;
+  }
+  digestInto(out: Uint8Array) {
+    assertExists(this);
+    assertBytes(out, this.outputLen);
+    this.finished = true;
+    this.iHash.digestInto(out);
+    this.oHash.update(out);
+    this.oHash.digestInto(out);
+    this.destroy();
+  }
+  digest() {
+    const out = new Uint8Array(this.oHash.outputLen);
+    this.digestInto(out);
+    return out;
+  }
+  _cloneInto(to?: HMAC<T>): HMAC<T> {
+    // Create new instance without calling constructor since key already in state and we don't know it.
+    to ||= Object.create(Object.getPrototypeOf(this), {});
+    const { oHash, iHash, finished, destroyed, blockLen, outputLen } = this;
+    to = to as this;
+    to.finished = finished;
+    to.destroyed = destroyed;
+    to.blockLen = blockLen;
+    to.outputLen = outputLen;
+    to.oHash = oHash._cloneInto(to.oHash);
+    to.iHash = iHash._cloneInto(to.iHash);
+    return to;
+  }
+  destroy() {
+    this.destroyed = true;
+    this.oHash.destroy();
+    this.iHash.destroy();
+  }
+}
+
+/**
+ * HMAC: RFC2104 message authentication code.
+ * @param hash - function that would be used e.g. sha256
+ * @param key - message key
+ * @param message - message data
+ */
+export const hmac = (hash: CHash, key: Input, message: Input): Uint8Array =>
+  new HMAC<any>(hash, key).update(message).digest();
+hmac.create = (hash: CHash, key: Input) => new HMAC<any>(hash, key);