@libp2p/aes-ctr/dist/src/cipher-mode.js

Streaming AES-CTR for node and browsers

import { InvalidKeyLengthError } from './errors.js';
const CIPHER_MODES = {
    16: 'aes-128-ctr',
    32: 'aes-256-ctr'
};
export function cipherMode(key) {
    if (key.length === 16 || key.length === 32) {
        return CIPHER_MODES[key.length];
    }
    const modes = Object.entries(CIPHER_MODES).map(([k, v]) => `${k} (${v})`).join(' / ');
    throw new InvalidKeyLengthError(`Invalid key length ${key.length} bytes. Must be ${modes}`);
}
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