$$contextualString
$$contextualString : string
The derivation context/application information string property storage.
Trait DerivationContextTrait - Reusable implementation of `DerivationContextInterface`.
setContextualString(string  $contextualString) : $this
                        Setter for the derivation context/application information string property.
| string | $contextualString | The derivation context/application information string. | 
Validation errors.
The hash algorithm object.