Method init

modules/crypt/etc/hmac.js:46–73

(key)

		this.hashLen = bitlen >> 3;	// in byte
	};
	init(key) {
		const h = this.h;
		if (key.byteLength > h.blockSize) {
			// truncate the key
			h.reset();
			h.write(key);
			key = new Uint8Array(h.close());
		}
		else {
			key = new Uint8Array(key);
		}

		this.ipad = new Uint8Array(h.blockSize);
		this.opad = new Uint8Array(h.blockSize);

		let l = key.length;
		if (l > h.blockSize)
			l = h.blockSize;
		let i = 0;
		for (; i < l; i++) {
			this.ipad[i] = key[i] ^ 0x36;
			this.opad[i] = key[i] ^ 0x5c;
		}
		this.ipad.fill(0x36, i);
		this.opad.fill(0x5c, i);
		h.reset();
		h.write(this.ipad.buffer);
	};
	update() {
		for (let i = 0; i < arguments.length; i++)
			this.h.write(arguments[i]);