encrypt

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Open source

encrypt

Caution

The experimental module k6/experimental/webcrypto has graduated, and its functionality is now available globally through the crypto object. The k6/experimental/webcrypto is deprecated and will be removed in the near future.

To migrate your scripts, remove the k6/experimental/webcrypto imports and use the crypto object instead.

The encrypt() method encrypts some data.

Usage

encrypt(algorithm, key, data)

Parameters

NameTypeDescription
algorithmAesCbcParams, AesCtrParams, or AesGcmParams objectDefines the algorithm to use and any extra-parameters.
keyCryptoKeyThe key to use for encryption.
dataArrayBuffer, TypedArray, or DataViewThe data to be encrypted (also known as “plaintext”).

Supported algorithms

AES-CBCAES-CTRAES-GCMRSA-OAEP
✅ AesCbcParams✅ AesCtrParams✅ AesGcmParams✅ RsaOaepParams

Return Value

A Promise that resolves to a new ArrayBuffer containing the encrypted data.

Throws

TypeDescription
InvalidAccessErrorRaised when the requested operation is not valid with the provided key. For instance when an invalid encryption algorithm is used, or a key not matching the selected algorithm is provided.
OperationErrorRaised when the operation failed for an operation-specific reason. For instance, if the algorithm size is invalid, or errors occurred during the process of decrypting the ciphertext.

Example

JavaScript 
import { crypto } from 'k6/experimental/webcrypto';

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 iv = crypto.getRandomValues(new Uint8Array(16));
  const ciphertext = await crypto.subtle.encrypt(
    {
      name: 'AES-CBC',
      iv: iv,
    },
    key,
    plaintext
  );

  /**
   * Decrypt the ciphertext using the same key to verify
   * that the resulting plaintext is the same as the original.
   */
  const deciphered = await crypto.subtle.decrypt(
    {
      name: 'AES-CBC',
      iv: iv,
    },
    key,
    ciphertext
  );

  console.log(
    'deciphered text == original plaintext: ',
    arrayBufferToHex(deciphered) === arrayBufferToHex(plaintext)
  );
}

function arrayBufferToHex(buffer) {
  return [...new Uint8Array(buffer)].map((x) => x.toString(16).padStart(2, '0')).join('');
}

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;
}