Function decryptImpl

lib/internal/crypto/webcrypto.js:1303–1326

(algorithm, key, data)

}

function decryptImpl(algorithm, key, data) {
  const prefix = prepareSubtleMethod(this, 'decrypt', arguments.length, 3);
  let i = 0;
  algorithm = convertSubtleArgument(
    prefix, 'AlgorithmIdentifier', algorithm, i++);
  key = convertSubtleArgument(prefix, 'CryptoKey', key, i++);
  data = convertSubtleArgument(prefix, 'BufferSource', data, i++);

  const normalizedAlgorithm = normalizeAlgorithm(algorithm, 'decrypt');

  if (normalizedAlgorithm.name !== getCryptoKeyAlgorithm(key).name)
    throw lazyDOMException('Key algorithm mismatch', 'InvalidAccessError');

  if (!hasCryptoKeyUsage(key, 'decrypt'))
    throw lazyDOMException(
      'Unable to use this key to decrypt', 'InvalidAccessError');

  return cipherOrWrap(
    kWebCryptoCipherDecrypt,
    normalizedAlgorithm,
    key,
    data,
  );
}

// Implements https://wicg.github.io/webcrypto-modern-algos/#SubtleCrypto-method-getPublicKey
function getPublicKey(key, keyUsages) {