HmacKeyAlgorithm constructor
      
      HmacKeyAlgorithm({ 
    
    
- KeyAlgorithm? hash,
- num? length,
- String? name,
Implementation
factory HmacKeyAlgorithm({
  _i3.KeyAlgorithm? hash,
  _i2.num? length,
  _i2.String? name,
}) =>
    HmacKeyAlgorithm._(
      hash: hash ?? _i6.undefined,
      length: length,
      name: name,
    );