https://github.com/andrewwhitehead/anoncreds-w3c-mapping
Python scripts for mapping between Anoncreds presentations and W3C credentials
https://github.com/andrewwhitehead/anoncreds-w3c-mapping
Last synced: about 1 month ago
JSON representation
Python scripts for mapping between Anoncreds presentations and W3C credentials
- Host: GitHub
- URL: https://github.com/andrewwhitehead/anoncreds-w3c-mapping
- Owner: andrewwhitehead
- Created: 2022-10-17T23:37:29.000Z (over 2 years ago)
- Default Branch: main
- Last Pushed: 2022-12-15T01:18:32.000Z (over 2 years ago)
- Last Synced: 2025-04-07T09:28:56.876Z (2 months ago)
- Language: Python
- Size: 109 KB
- Stars: 5
- Watchers: 1
- Forks: 3
- Open Issues: 5
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# AnonCreds to W3C Format Verifiable Credential and Presentation Converter
This repository contains prototype Python scripts that:
- Convert AnonCreds Verifiable Credentials into compliant W3C Format Verifiable Credentials and back, and
- Convert AnonCreds Presentations into compliant W3C Format Verifiable Presentations and back.
These scripts are preliminary work in a possible transition of using the W3C Verifiable Credential Data Model Standard
for AnonCreds verifiable credentials and presentations. As demonstrated by the back and forth nature of the
conversion and the absence of any cryptography library dependencies, nothing is being done to change the AnonCreds signatures
or to alter the semantics of the AnonCreds credentials and presentations. The same AnonCreds code that is currently
used in issuing, holding, proving and verifying AnonCreds continues to be used. The only change is the representation
(arrangement of the JSON) within the credential and presentation.
To run the generator with your own examples:
- Place your AnonCreds credentials JSON in the `credentials` folder, and your AnonCreds presentations in the `presentations` folder.
- Run the bash script `./generateAll`
- Look in the `W3COutput` folder to see all of the converted credentials and presentations.
To run the scripts directly, use:
- `python credential_to_w3c.py [> output.json]`
- `python presentation_to_w3c_vp.py [> output.json]`
## Notes
- Attributes are encoded as name-value pairs. This bypasses the need to define
a custom JSON-LD contexts for each credential schema, as without changing AnonCreds, there is not a way for the Issuer to say where the context can be found.
- The converter is not including the `encoded` values of the AnonCreds
verifiable credential attributes in the W3C formats, using instead a
flag `"encoding": "auto",`, and converting `raw` to `encoded` data on
the fly. The encoder matches [Aries RFC 0592 Indy Attachments section on
Encoding
Claims](https://github.com/hyperledger/aries-rfcs/tree/main/features/0592-indy-attachments#encoding-claims).
We think that the code for generating the encoded values should be moved into
AnonCreds and out of the hands of the Issuer.
Feedback, issues and pull requests welcome!