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extendSigners.md

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Extending Credential signing

To implement your own signature suite for signing and verifying credentials, build a signer-class extending Signer and implement the containing methods. The class itself and sample implementations could be found in credentials/credential_signer.dart.

buildProof - Method

  • the parameter data is the data, that should be signed. It is expected, that your method could work with the following datatypes:
    • List<int> representing hashed data
    • String
    • Map<String, dynamic> representing a json-Object
  • the method should return a proof-object (json object = Map<String, dynamic>) according to Linked Data Proof data model

verifyProof - Method

  • for data parameter there are same expectations as in buildProof-method. This is the data that was signed without its proof section.

use your signers

  • the credential and presentation signing functions (signCredential and buildPresentation) allows you to give them your signer as parameter. Then this one is used exclusively. Per default one of the implemented signers is selected according to the did the credential/presentation should be signed with.
  • the credential and presentation verification function (verifyCredential and verifyPresentation) expect a function that could select a signer according to the signature type as optional parameter. This function should expect the signature type (String) as parameter and return a Signer-Object.