9 lines
388 B
Plaintext
9 lines
388 B
Plaintext
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import { createHmac } from 'node:crypto';
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import { concat, uint64be } from '../lib/buffer_utils.js';
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export default function cbcTag(aad, iv, ciphertext, macSize, macKey, keySize) {
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const macData = concat(aad, iv, ciphertext, uint64be(aad.length << 3));
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const hmac = createHmac(`sha${macSize}`, macKey);
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hmac.update(macData);
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return hmac.digest().slice(0, keySize >> 3);
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}
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