code: function decrypt (ciphertext, key, nonce, algo) {
    if (!CRYPTO_FUNCTIONS[algo]) throw new Error(algo + ' is not available')
    return CRYPTO_FUNCTIONS[algo].decrypt({ ciphertext, nonce, key })
  }
docs: Symmetric private key decryption using secret (derived) key.
  @param {buffer|Uint8Array} ciphertext Data to be decrypted.
  @param {buffer|Uint8Array} key Secret key.
  @param {buffer|Uint8Array} nonce Nonce from key-object.
  @param {string=} algo Encryption algorithm.
  @return {buffer} Decrypted data.