ssikit_trustchain/main.py

import asyncio
import didkit
import json
from jinja2 import Environment, FileSystemLoader, select_autoescape
import idhub_ssikit


def issue_vc_test(vc_name):
    jwk_issuer = didkit.generate_ed25519_key()
    jwk_subject = didkit.generate_ed25519_key()

    did_issuer = didkit.key_to_did("key", jwk_issuer)
    did_subject = didkit.key_to_did("key", jwk_subject)

    env = Environment(
        loader=FileSystemLoader("vc_templates"),
        autoescape=select_autoescape()
    )
    unsigned_vc_template = env.get_template(f"{vc_name}.json")
    data_raw = open(f"vc_templates/{vc_name}--data.py").read()
    data = eval(data_raw)
    data["issuerDid"] = did_issuer
    data["subjectDid"] = did_subject
    signed_credential = idhub_ssikit.render_and_sign_credential(
        unsigned_vc_template,
        jwk_issuer,
        data
    )
    print(signed_credential)


def issue_vc_test_2():
    jwk_issuer = didkit.generate_ed25519_key()
    jwk_subject = didkit.generate_ed25519_key()

    did_issuer = didkit.key_to_did("key", jwk_issuer)
    did_subject = didkit.key_to_did("key", jwk_subject)

    env = Environment(
        loader=FileSystemLoader("vc_templates"),
        autoescape=select_autoescape()
    )
    unsigned_vc_template = env.get_template("membership-card.json")
    data = {
        "vc_id": "http://example.org/credentials/3731",
        "issuer_did": did_issuer,
        "subject_did": did_subject,
        "issuance_date": "2020-08-19T21:41:50Z",
        "validUntil": "2020-08-19T21:41:50Z",
        "membershipType": "lareputa"
    }
    signed_credential = idhub_ssikit.render_and_sign_credential(
        unsigned_vc_template,
        jwk_issuer,
        data
    )
    print(signed_credential)
    verification_result = idhub_ssikit.verify_credential(signed_credential)
    print(verification_result)
    def replace(s, position, character):
        return s[:position] + character + s[position+1:]
    signed_credential = replace(signed_credential, 2843, "k")
    verification_result = idhub_ssikit.verify_credential(signed_credential)
    print(verification_result)



def issue_and_sign_vp_test():
    """
    In this example execution two Verifiable Credentials associated with a single Holder are issued and then
    combined into a single Verifiable Presentation.
    The Verifiable Credentials are of two different models. The use-case is meant to mimic
        - Holder being a physical person,
        - Issuer A being "Pare Manel" foundation,
        - Issuer B being "EXO" foundation,
        - Verifier (not pictured) being "Som Connexio", which wants verifiable data of the Holder from both Issuers.
    """
    jwk_issuer = didkit.generate_ed25519_key()
    jwk_issuer2 = didkit.generate_ed25519_key()
    jwk_subject = didkit.generate_ed25519_key()

    did_issuer = didkit.key_to_did("key", jwk_issuer)
    did_issuer2 = didkit.key_to_did("key", jwk_issuer2)
    did_subject = didkit.key_to_did("key", jwk_subject)
    print(did_issuer)
    print(did_issuer2)
    print(did_subject)

    env = Environment(
        loader=FileSystemLoader("vc_templates"),
        autoescape=select_autoescape()
    )
    unsigned_vc_template = env.get_template("member.json")
    data = {
        "vc_id": "http://example.org/credentials/3731",
        "issuer_did": did_issuer,
        "subject_did": did_subject,
        "issuance_date": "2020-08-19T21:41:50Z",
        "subject_is_member_of": "Pangea"
    }
    signed_credential = idhub_ssikit.render_and_sign_credential(
        unsigned_vc_template,
        jwk_issuer,
        data
    )
    data2 = data
    data2["issuer_did"] = did_issuer2
    signed_credential2 = idhub_ssikit.render_and_sign_credential(
        unsigned_vc_template,
        jwk_issuer2,
        data2
    )
    signed_presentation = idhub_ssikit.issue_verifiable_presentation([signed_credential, signed_credential2], jwk_subject, did_subject)
    print("##############--- SIGNED PRESENTATION ---##############")
    print(signed_presentation)
    print("##############--- ------------------- ---##############")

    res = idhub_ssikit.verify_presentation(signed_presentation)
    print(res)