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qwen/nodejs/node_modules/@noble/hashes/esm/hmac.js

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+/**
+ * HMAC: RFC2104 message authentication code.
+ * @module
+ */
+import { abytes, aexists, ahash, clean, Hash, toBytes } from "./utils.js";
+export class HMAC extends Hash {
+    constructor(hash, _key) {
+        super();
+        this.finished = false;
+        this.destroyed = false;
+        ahash(hash);
+        const key = toBytes(_key);
+        this.iHash = hash.create();
+        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();
+        // Undo internal XOR && apply outer XOR
+        for (let i = 0; i < pad.length; i++)
+            pad[i] ^= 0x36 ^ 0x5c;
+        this.oHash.update(pad);
+        clean(pad);
+    }
+    update(buf) {
+        aexists(this);
+        this.iHash.update(buf);
+        return this;
+    }
+    digestInto(out) {
+        aexists(this);
+        abytes(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) {
+        // Create new instance without calling constructor since key already in state and we don't know it.
+        to || (to = Object.create(Object.getPrototypeOf(this), {}));
+        const { oHash, iHash, finished, destroyed, blockLen, outputLen } = this;
+        to = to;
+        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;
+    }
+    clone() {
+        return this._cloneInto();
+    }
+    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
+ * @example
+ * import { hmac } from '@noble/hashes/hmac';
+ * import { sha256 } from '@noble/hashes/sha2';
+ * const mac1 = hmac(sha256, 'key', 'message');
+ */
+export const hmac = (hash, key, message) => new HMAC(hash, key).update(message).digest();
+hmac.create = (hash, key) => new HMAC(hash, key);
+//# sourceMappingURL=hmac.js.map