## API Module

The API-module contains interfaces and domain model value 
classes that provide the basic functionality to build an sdk-client.

### Service Architecture



```mermaid
classDiagram

  class CryptoService{
    + decryptString
    + decryptBytes 
    + encryptString
    + encryptBytes 
   }


   class CertificateValidator{
        + validatePublicKey
  }

  class MetadataValidator{
    + validateMetadataSchema
    + validateMetadataHashValues
  }

  class MetadataService{
    + createMetadata
  }

  class OAuthService{
   + authenticate
  }

  class Sender {
    + retrieveOAuthToken
    + validatePublicKey
    + encryptSubmissionData
    + encryptAttachment
    + MetadataService
    + createMetadata
  }

   class Subscriber {
    + retrieveOAuthToken
    + decryptSubmissionData
    + decryptAttachment
    + validateMetadataSchema
    + validateMetadataHashValues
  }

  class SenderClient{
    ClientFactory
  }
  
   class SubscriberClient{
    ClientFactory
  }


SenderClient  ..> ClientFactory : Uses
SubscriberClient  ..> ClientFactory : Uses
ClientFactory  ..> Sender : Creates
ClientFactory  ..> Subscriber : Creates

Sender ..> CertificateValidator : Uses

Sender ..> MetadataService : Uses
Sender ..> OAuthService : Uses
Sender ..> CryptoService : Uses


Subscriber ..> OAuthService : Uses
Subscriber ..> CryptoService : Uses
Subscriber ..> MetadataValidator : Uses

```