AesCbcParams

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AesCbcParams

The AesCbcParams object represents the object that should be passed as the algorithm parameter into the encrypt and decrypt operation when using the AES-CBC algorithm.

For more details, head to the MDN Web Crypto API documentation on AES-CBC.

Properties

PropertyTypeDescription
namestringShould be set to AES-CBC.
ivArrayBuffer, TypedArray, or DataViewThe initialization vector. Must be 16 bytes, unpredictable and cryptographically random. Yet, it doesn’t need to be secret and can be transmitted along with the ciphertext.

Example

JavaScript 
export default async function () {
  const plaintext = stringToArrayBuffer('Hello, World!');

  /**
   * Generate a symmetric key using the AES-CBC algorithm.
   */
  const key = await crypto.subtle.generateKey(
    {
      name: 'AES-CBC',
      length: 256,
    },
    true,
    ['encrypt', 'decrypt']
  );

  /**
   * Encrypt the plaintext using the AES-CBC key with
   * have generated.
   */
  const ciphertext = await crypto.subtle.encrypt(
    {
      name: 'AES-CBC',
      iv: crypto.getRandomValues(new Uint8Array(16)),
    },
    key,
    plaintext
  );
}

function stringToArrayBuffer(str) {
  const buf = new ArrayBuffer(str.length * 2); // 2 bytes for each char
  const bufView = new Uint16Array(buf);
  for (let i = 0, strLen = str.length; i < strLen; i++) {
    bufView[i] = str.charCodeAt(i);
  }
  return buf;
}