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oidc4vc.py
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oidc4vc.py
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import requests
from jwcrypto import jwk, jwt
import base64
import base58
import json
from datetime import datetime
import logging
import math
import hashlib
from random import randbytes
import x509_attestation
logging.basicConfig(level=logging.INFO)
"""
https://ec.europa.eu/digital-building-blocks/wikis/display/EBSIDOC/EBSI+DID+Method
VC/VP https://ec.europa.eu/digital-building-blocks/wikis/display/EBSIDOC/E-signing+and+e-sealing+Verifiable+Credentials+and+Verifiable+Presentations
DIDS method https://ec.europa.eu/digital-building-blocks/wikis/display/EBSIDOC/EBSI+DID+Method
supported signature: https://ec.europa.eu/digital-building-blocks/wikis/display/EBSIDOC/E-signing+and+e-sealing+Verifiable+Credentials+and+Verifiable+Presentations
"""
#issuer_did = 'did:jwk:' + base64.urlsafe_b64encode(json.dumps(issuer_public_key).replace(" ", "").encode()).decode()
def generate_key(curve):
"""
alg value https://www.rfc-editor.org/rfc/rfc7518#page-6
+--------------+-------------------------------+--------------------+
| "alg" Param | Digital Signature or MAC | Implementation |
| Value | Algorithm | Requirements |
+--------------+-------------------------------+--------------------+
| RS256 | RSASSA-PKCS1-v1_5 using | Recommended |
| | SHA-256 | |
| RS384 | RSASSA-PKCS1-v1_5 using | Optional |
| | SHA-384 | |
| RS512 | RSASSA-PKCS1-v1_5 using | Optional |
| | SHA-512 | |
| ES256 | ECDSA using P-256 and SHA-256 | Recommended+ |
| ES384 | ECDSA using P-384 and SHA-384 | Optional |
| ES512 | ECDSA using P-521 and SHA-512 | Optional |
+--------------+-------------------------------+--------------------+
"""
if curve in ['P-256', 'P-384', 'P-521', 'secp256k1']:
key = jwk.JWK.generate(kty='EC', crv=curve)
elif curve == 'RSA':
key = jwk.JWK.generate(kty='RSA', size=2048)
else:
raise Exception("Curve not supported")
return json.loads(key.export(private_key=True))
def alg(key):
key = json.loads(key) if isinstance(key, str) else key
if key['kty'] == 'EC':
if key['crv'] in ['secp256k1', 'P-256K']:
key['crv'] = 'secp256k1'
return 'ES256K'
elif key['crv'] == 'P-256':
return 'ES256'
elif key['crv'] == 'P-384':
return 'ES384'
elif key['crv'] == 'P-521':
return 'ES512'
else:
raise Exception("Curve not supported")
elif key['kty'] == 'RSA':
return 'RS256'
elif key['kty'] == 'OKP':
return 'EdDSA'
else:
raise Exception("Key type not supported")
def resolve_wallet_did_ebsi_v3(did) -> str:
a = did.split('did:key:z')[1]
b = base58.b58decode(a.encode())
try:
return b.split(b'\xd1\xd6\x03')[1].decode()
except Exception:
return
def generate_wallet_did_ebsiv3(key):
# json string, remove space, alphabetical ordered
if isinstance(key, str):
key = json.loads(pub_key)
if key["kty"] == "EC":
jwk = {
"crv": key["crv"], # seckp256k1 or P-256
"kty": "EC",
"x": key["x"],
"y": key["y"]
}
elif key["kty"] == "OKP":
jwk = {
"crv": "Ed25519", # pub_key["crv"], # Ed25519
"kty": "OKP",
"x": key["x"]
}
else:
logging.error("Curve not supported")
return
data = json.dumps(jwk).replace(" ", "").encode()
prefix = b'\xd1\xd6\x03'
return "did:key:z" + base58.b58encode(prefix + data).decode()
def pub_key(key):
key = json.loads(key) if isinstance(key, str) else key
Key = jwk.JWK(**key)
return Key.export_public(as_dict=True)
def sign_jwt_vc(vc, kid, issuer_key, nonce, iss, jti, sub):
"""
For issuer
https://jwcrypto.readthedocs.io/en/latest/jwk.html
https://openid.net/specs/openid-connect-core-1_0.html#StandardClaims
"""
issuer_key = json.loads(issuer_key) if isinstance(issuer_key, str) else issuer_key
vc = json.loads(vc) if isinstance(vc, str) else vc
signer_key = jwk.JWK(**issuer_key)
header = {
'typ':'JWT',
'kid': kid,
'alg': alg(issuer_key)
}
payload = {
'iss': iss,
'nonce': nonce,
'iat': math.floor(datetime.timestamp(datetime.now())),
'nbf': math.floor(datetime.timestamp(datetime.now())),
'exp': math.floor(datetime.timestamp(datetime.now())) + 365*24*60*60,
'jti': jti
}
if sub:
payload['sub'] = sub
payload['vc'] = vc
token = jwt.JWT(header=header, claims=payload, algs=[alg(issuer_key)])
token.make_signed_token(signer_key)
a = jwt.JWT.from_jose_token(token.serialize())
verif_key = jwk.JWK(**issuer_key)
a.validate(verif_key)
print("payload VC = ", json.dumps(payload, indent= 4))
return token.serialize()
def sign_jwt_vp(vc, audience, holder_vm, holder_did, nonce, vp_id, holder_key):
"""
For Wallet
Build and sign verifiable presentation as vp_token
Ascii is by default in the json string
"""
holder_key = json.loads(holder_key) if isinstance(holder_key, str) else holder_key
signer_key = jwk.JWK(**holder_key)
header = {
"typ":"JWT",
"alg": alg(holder_key),
"kid": holder_vm,
"jwk": pub_key(holder_key),
}
iat = round(datetime.timestamp(datetime.now()))
payload = {
"iat": iat,
"jti": vp_id,
"nbf": iat,
"aud": audience,
"exp": iat + 1000,
"sub": holder_did,
"iss": holder_did,
"vp": {
"@context": ["https://www.w3.org/2018/credentials/v1"],
"id": vp_id,
"type": ["VerifiablePresentation"],
"holder": holder_did,
"verifiableCredential": [vc]
},
"nonce": nonce
}
token = jwt.JWT(header=header, claims=payload, algs=[alg(holder_key)])
token.make_signed_token(signer_key)
return token.serialize()
def salt():
return base64.urlsafe_b64encode(randbytes(16)).decode().replace("=", "")
def hash(text):
m = hashlib.sha256()
m.update(text.encode())
return base64.urlsafe_b64encode(m.digest()).decode().replace("=", "")
def sign_sd_jwt(unsecured, issuer_key, issuer, subject_key, duration=365*24*60*60, x5c=False):
"""
https://www.ietf.org/archive/id/draft-ietf-oauth-sd-jwt-vc-01.html
GAIN POC https://gist.github.com/javereec/48007399d9876d71f523145da307a7a3
HAIP : https://openid.net/specs/openid4vc-high-assurance-interoperability-profile-sd-jwt-vc-1_0-00.html
"""
disclosed_claims = ['status', 'vct', 'iat', 'iss', 'exp', '_sd_alg', 'cnf']
issuer_key = json.loads(issuer_key) if isinstance(issuer_key, str) else issuer_key
subject_key = json.loads(subject_key) if isinstance(subject_key, str) else subject_key
payload = {
'iss': issuer,
'iat': math.ceil(datetime.timestamp(datetime.now())),
'exp': math.ceil(datetime.timestamp(datetime.now())) + duration,
"_sd_alg": "sha-256",
"cnf": {
"jwk": subject_key
},
}
payload['_sd'] = []
_disclosure = ""
disclosure_list = unsecured.get("disclosure", [])
if not disclosure_list:
logging.warning("disclosure is missing in sd-jwt")
for claim in [attribute for attribute in unsecured.keys()]:
if claim == "disclosure":
pass
# for attribute to disclose
elif claim in disclosure_list or claim in disclosed_claims:
payload[claim] = unsecured[claim]
# for undisclosed attribute
elif isinstance(unsecured[claim], str) or isinstance(unsecured[claim], bool) :
contents = json.dumps([salt(), claim, unsecured[claim]])
disclosure = base64.urlsafe_b64encode(contents.encode()).decode().replace("=", "")
_disclosure += "~" + disclosure
payload['_sd'].append(hash(disclosure))
# for nested json
elif isinstance(unsecured[claim], dict):
payload.update({claim: {'_sd': []}})
nested_disclosure_list = unsecured[claim].get("disclosure", [])
if not nested_disclosure_list:
logging.warning("disclosure is missing for %s", claim)
for nested_claim in [attribute for attribute in unsecured[claim].keys()]:
if nested_claim == 'disclosure':
pass
elif nested_claim in nested_disclosure_list:
payload[claim][nested_claim] = unsecured[claim][nested_claim]
else:
nested_contents = json.dumps([salt(), nested_claim, unsecured[claim][nested_claim]])
nested_disclosure = base64.urlsafe_b64encode(nested_contents.encode()).decode().replace("=", "")
_disclosure += "~" + nested_disclosure
payload[claim]['_sd'].append(hash(nested_disclosure))
if not payload[claim]['_sd']: del payload[claim]['_sd']
# for list
elif isinstance(unsecured[claim], list): # list
nb = len(unsecured[claim])
payload.update({claim: []})
for index in range(0, nb):
if isinstance(unsecured[claim][index], dict):
nested_disclosure_list = unsecured[claim][index].get("disclosure", [])
if not nested_disclosure_list:
logging.warning("disclosure is missing for %s", claim)
else:
nested_disclosure_list = []
for index in range(0,nb):
if isinstance(unsecured[claim][index], dict):
pass
elif unsecured[claim][index] in nested_disclosure_list:
payload[claim].append(unsecured[claim][index])
else:
contents = json.dumps([salt(), unsecured[claim][index]])
nested_disclosure = base64.urlsafe_b64encode(contents.encode()).decode().replace("=", "")
_disclosure += "~" + nested_disclosure
payload[claim].append({"..." : hash(nested_disclosure)})
else:
logging.warning("type not supported")
if not payload['_sd']:
del payload['_sd']
del payload["_sd_alg"]
logging.info("sd-jwt payload = %s", payload)
signer_key = jwk.JWK(**issuer_key)
kid = issuer_key.get('kid') if issuer_key.get('kid') else signer_key.thumbprint()
header = {
'typ': "vc+sd-jwt",
'alg': alg(issuer_key)
}
if x5c:
header['x5c'] = x509_attestation.build_x509_san_dns(hostname=issuer)
else:
header['kid'] = kid
try:
if subject_key.get("use"): del subject_key['use']
except:
logging.error("error, subject_key = none")
if unsecured.get('status'): payload['status'] = unsecured['status']
token = jwt.JWT(header=header, claims=payload, algs=[alg(issuer_key)])
token.make_signed_token(signer_key)
return token.serialize() + _disclosure + "~"
def build_pre_authorized_code(key, wallet_did, issuer_did, issuer_vm, nonce):
key = json.loads(key) if isinstance(key, str) else key
key = jwk.JWK(**key)
header = {
"typ":"JWT",
"alg": alg(key),
"kid": issuer_vm,
}
payload = {
"iat": round(datetime.timestamp(datetime.now())),
"client_id": wallet_did,
"aud": issuer_did,
"exp": round(datetime.timestamp(datetime.now())) + 1000,
"sub": wallet_did,
"iss": issuer_did,
"nonce": nonce
}
token = jwt.JWT(header=header, claims=payload, algs=[alg(key)])
token.make_signed_token(key)
return token.serialize()
def resolve_did(vm) -> dict:
logging.info('vm = %s', vm)
try:
did = vm.split('#')[0]
except Exception:
logging.error("This verification method is not supported %s", vm)
return
# try did for ebsi v3
try:
jwk = resolve_wallet_did_ebsi_v3(did)
except Exception:
jwk = None
if jwk:
logging.info('wallet jwk EBSI-V3= %s', jwk)
return json.loads(jwk)
elif did.split(':')[1] == "jwk":
key = did.split(':')[2]
key += "=" * ((4 - len(key) % 4) % 4)
return json.loads(base64.urlsafe_b64decode(key))
elif did.split(':')[1] == "web":
logging.info("did:web")
did_document = resolve_did_web(did)
for verificationMethod in did_document:
if vm == verificationMethod['id'] or '#' + vm.split('#')[1] == verificationMethod['id']:
jwk = verificationMethod.get('publicKeyJwk')
logging.info('wallet jwk = %s', jwk)
return jwk
else:
url = 'https://unires:[email protected]/1.0/identifiers/' + did
try:
r = requests.get(url, timeout=5)
logging.info('Access to Talao Universal Resolver')
except Exception:
logging.error('cannot access to Talao Universal Resolver for %s', vm)
url = 'https://dev.uniresolver.io/1.0/identifiers/' + did
try:
r = requests.get(url, timeout=5)
logging.info('Access to Public Universal Resolver')
except Exception:
logging.warning('fails to access to both universal resolver')
return
did_document = r.json()
for verificationMethod in did_document['didDocument']['verificationMethod']:
if vm == verificationMethod['id'] or '#' + vm.split('#')[1] == verificationMethod['id']:
jwk = verificationMethod.get('publicKeyJwk')
if not jwk:
publicKeyBase58 = verificationMethod.get('publicKeyBase58')
logging.info('wallet publiccKeyBase48 = %s', publicKeyBase58)
return publicKeyBase58
else:
logging.info('wallet jwk = %s', jwk)
return jwk
def verif_token(token, nonce, aud=None):
"""
For issuer
raise exception if problem
https://jwcrypto.readthedocs.io/en/latest/jwt.html#jwcrypto.jwt.JWT.validate
"""
header = get_header_from_token(token)
payload = get_payload_from_token(token)
if nonce and payload.get('nonce') != nonce:
raise Exception("nonce is incorrect")
if aud and payload.get('aud') != aud:
raise Exception("aud is incorrect")
if header.get('jwk'):
if isinstance(header['jwk'], str):
header['jwk'] = json.loads(header['jwk'])
dict_key = header['jwk']
elif header.get('kid'):
dict_key = resolve_did(header['kid'])
if not dict_key:
raise Exception("Cannot get public key with kid")
elif payload.get('sub_jwk'):
dict_key = payload['sub_jwk']
else:
raise Exception("Cannot resolve public key")
a = jwt.JWT.from_jose_token(token)
issuer_key = jwk.JWK(**dict_key)
a.validate(issuer_key)
return True
def get_payload_from_token(token) -> dict:
payload = token.split('.')[1]
payload += "=" * ((4 - len(payload) % 4) % 4) # solve the padding issue of the base64 python lib
return json.loads(base64.urlsafe_b64decode(payload).decode())
def get_header_from_token(token):
header = token.split('.')[0]
header += "=" * ((4 - len(header) % 4) % 4) # solve the padding issue of the base64 python lib
return json.loads(base64.urlsafe_b64decode(header).decode())
def build_proof_of_key_ownership(key, kid, aud, signer_did, nonce, jwk=False):
key = json.loads(key) if isinstance(key, str) else key
signer_key = jwk.JWK(**key)
header = {
'typ': 'openid4vci-proof+jwt',
'alg': alg(key),
}
if jwk:
header['jwk'] = signer_key.export(private_key=False, as_dict=True)
else:
header['kid'] = kid
payload = {
'iss': signer_did, # client id of the clent making the credential request
'nonce': nonce,
'iat': datetime.timestamp(datetime.now()),
'aud': aud # Credential Issuer URL
}
token = jwt.JWT(header=header, claims=payload, algs=[alg(key)])
token.make_signed_token(signer_key)
return token.serialize()
def thumbprint(key):
key = json.loads(key) if isinstance(key, str) else key
if key['crv'] == 'P-256K':
key['crv'] = 'secp256k1'
signer_key = jwk.JWK(**key)
a = signer_key.thumbprint()
a += "=" * ((4 - len(a) % 4) % 4)
return base64.urlsafe_b64decode(a).hex()
def thumbprint_str(key):
key = json.loads(key) if isinstance(key, str) else key
if key['crv'] == 'P-256K':
key['crv'] = 'secp256k1'
signer_key = jwk.JWK(**key)
return signer_key.thumbprint()
def verification_method(did, key): # = kid
key = json.loads(key) if isinstance(key, str) else key
signer_key = jwk.JWK(**key)
thumb_print = signer_key.thumbprint()
return did + '#' + thumb_print
def resolve_did_web(did) -> str:
"""
get DID document for the did:web
"""
if did.split(':')[1] != 'web':
return
url = 'https://' + did.split(':')[2]
i = 3
try:
while did.split(':')[i]:
url = url + '/' + did.split(':')[i]
i += 1
except Exception:
pass
url = url + '/did.json'
r = requests.get(url)
if 399 < r.status_code < 500:
logging.warning('return API code = %s', r.status_code)
return "{'error': 'did:web not found on server'}"
return r.json()
def did_resolve_lp(did):
#for legal person did:ebsi and did:web
#API v3 Get DID document with EBSI API
#https://api-pilot.ebsi.eu/docs/apis/did-registry/latest#/operations/get-did-registry-v3-identifier
if did.split(':')[1] == 'ebsi':
url = 'https://api-pilot.ebsi.eu/did-registry/v3/identifiers/' + did
try:
r = requests.get(url)
except Exception:
logging.error('cannot access to EBSI API')
return "{'error': 'cannot access to EBSI registry'}"
logging.info("DID Document = %s", r.json())
return r.json()
else:
url = 'https://unires:[email protected]/1.0/identifiers/' + did
try:
r = requests.get(url, timeout=10)
logging.info('Access to Talao Universal Resolver')
except Exception:
logging.error('cannot access to Talao Universal Resolver API')
return "{'error': 'cannot access to Talao Universal Resolver API'}"
logging.info("DID Document = %s", r.json())
return r.json().get('didDocument')
def get_issuer_registry_data(did):
"""
API v3
https://api-pilot.ebsi.eu/docs/apis/trusted-issuers-registry/latest#/operations/get-trusted-issuers-registry-v3-issuers-issuer
"""
try:
url = 'https://api-pilot.ebsi.eu/trusted-issuers-registry/v3/issuers/' + did
r = requests.get(url)
except Exception:
logging.error('cannot access API')
return
if 399 < r.status_code < 500:
logging.warning('return API code = %s', r.status_code)
return
try:
body = r.json()['attributes'][0]['body']
return base64.urlsafe_b64decode(body).decode()
except Exception:
logging.error('registry data in invalid format')
return