@hackbg/miscreant-esm/src/providers/webcrypto/aes.dist.mjs

(ESM port) Misuse resistant symmetric encryption library providing AES-SIV (RFC 5297), AES-PMAC-SIV, and STREAM constructions

import Block from "../../internals/block.dist.mjs";
export default class WebCryptoAes {
  _crypto;
  _key;
  static async importKey(crypto, keyData) {
    if (keyData.length !== 16 && keyData.length !== 32) {
      throw new Error(`Miscreant: invalid key length: ${keyData.length} (expected 16 or 32 bytes)`);
    }
    const key = await crypto.subtle.importKey("raw", keyData, "AES-CBC", false, ["encrypt"]);
    return new WebCryptoAes(crypto, key);
  }
  _iv = new Block();
  _emptyPromise;
  constructor(_crypto, _key) {
    this._crypto = _crypto;
    this._key = _key;
    this._emptyPromise = Promise.resolve(this);
  }
  clear() {
    return this;
  }
  async encryptBlock(block) {
    const params = {
      name: "AES-CBC",
      iv: this._iv.data
    };
    const ctBlock = await this._crypto.subtle.encrypt(params, this._key, block.data);
    block.data.set(new Uint8Array(ctBlock, 0, Block.SIZE));
    return this._emptyPromise;
  }
}