Function getKeyLength

lib/internal/crypto/webcrypto.js:299–336

({ name, length, hash })

}

function getKeyLength({ name, length, hash }) {
  switch (name) {
    case 'AES-CTR':
    case 'AES-CBC':
    case 'AES-GCM':
    case 'AES-OCB':
    case 'AES-KW':
      if (length !== 128 && length !== 192 && length !== 256)
        throw lazyDOMException('Invalid key length', 'OperationError');

      return length;
    case 'HMAC':
      if (length === undefined) {
        return getBlockSize(hash?.name);
      }

      if (typeof length === 'number' && length !== 0) {
        return length;
      }

      throw lazyDOMException('Invalid key length', 'OperationError');
    case 'KMAC128':
    case 'KMAC256':
      if (typeof length === 'number') {
        return length;
      }

      return name === 'KMAC128' ? 128 : 256;
    case 'HKDF':
    case 'PBKDF2':
    case 'Argon2d':
    case 'Argon2i':
    case 'Argon2id':
      return null;
    case 'ChaCha20-Poly1305':
      return 256;
  }
}

function deriveKey(
  algorithm,