def do_test_signature(self, chain, display_chain, type):
merkle_tree_generator = MerkleTreeGenerator()
merkle_tree_generator.populate(get_test_data_generator())
_ = merkle_tree_generator.get_blockchain_data()
gen = merkle_tree_generator.get_proof_generator(
'8087c03e7b7bc9ca7b355de9d9d8165cc5c76307f337f0deb8a204d002c8e582', chain)
p1 = next(gen)
_ = next(gen)
p3 = next(gen)
p1_expected = {'type': ['MerkleProof2017', 'Extension'],
'merkleRoot': '0932f1d2e98219f7d7452801e2b64ebd9e5c005539db12d9b1ddabe7834d9044',
'targetHash': '6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b',
'proof': [{'right': 'd4735e3a265e16eee03f59718b9b5d03019c07d8b6c51f90da3a666eec13ab35'},
{'right': '4e07408562bedb8b60ce05c1decfe3ad16b72230967de01f640b7e4729b49fce'}],
'anchors': [
{'sourceId': '8087c03e7b7bc9ca7b355de9d9d8165cc5c76307f337f0deb8a204d002c8e582',
'type': type,
'chain': display_chain}]}
p3_expected = {'type': ['MerkleProof2017', 'Extension'],
'merkleRoot': '0932f1d2e98219f7d7452801e2b64ebd9e5c005539db12d9b1ddabe7834d9044',
'targetHash': '4e07408562bedb8b60ce05c1decfe3ad16b72230967de01f640b7e4729b49fce',
'proof': [{'left': '4295f72eeb1e3507b8461e240e3b8d18c1e7bd2f1122b11fc9ec40a65894031a'}],
'anchors': [{'sourceId': '8087c03e7b7bc9ca7b355de9d9d8165cc5c76307f337f0deb8a204d002c8e582',
'type': type,
'chain': display_chain}]}
self.assertEqual(p1, p1_expected)
self.assertEqual(p3, p3_expected)
def test_generate(self):
merkle_tree_generator = MerkleTreeGenerator()
merkle_tree_generator.populate(get_test_data_generator())
byte_array = merkle_tree_generator.get_blockchain_data()
self.assertEqual(
b2h(byte_array),
'0932f1d2e98219f7d7452801e2b64ebd9e5c005539db12d9b1ddabe7834d9044')
def test_proofs(self):
merkle_tree_generator = MerkleTreeGenerator()
merkle_tree_generator.populate(get_test_data_generator())
_ = merkle_tree_generator.get_blockchain_data()
gen = merkle_tree_generator.get_proof_generator(
'8087c03e7b7bc9ca7b355de9d9d8165cc5c76307f337f0deb8a204d002c8e582', Chain.mainnet)
p1 = next(gen)
_ = next(gen)
p3 = next(gen)
p1_expected = {'type': ['MerkleProof2017', 'Extension'],
'merkleRoot': '0932f1d2e98219f7d7452801e2b64ebd9e5c005539db12d9b1ddabe7834d9044',
'targetHash': '6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b',
'proof': [{'right': 'd4735e3a265e16eee03f59718b9b5d03019c07d8b6c51f90da3a666eec13ab35'},
{'right': '4e07408562bedb8b60ce05c1decfe3ad16b72230967de01f640b7e4729b49fce'}],
'anchors': [
{'sourceId': '8087c03e7b7bc9ca7b355de9d9d8165cc5c76307f337f0deb8a204d002c8e582',
'type': 'BTCOpReturn'}]}
p3_expected = {'type': ['MerkleProof2017', 'Extension'],
'merkleRoot': '0932f1d2e98219f7d7452801e2b64ebd9e5c005539db12d9b1ddabe7834d9044',
'targetHash': '4e07408562bedb8b60ce05c1decfe3ad16b72230967de01f640b7e4729b49fce',
'proof': [{'left': '4295f72eeb1e3507b8461e240e3b8d18c1e7bd2f1122b11fc9ec40a65894031a'}],
'anchors': [{'sourceId': '8087c03e7b7bc9ca7b355de9d9d8165cc5c76307f337f0deb8a204d002c8e582',
'type': 'BTCOpReturn'}]}
self.assertEqual(p1, p1_expected)
self.assertEqual(p3, p3_expected)
class SimplifiedCertificateBatchIssuer:
"""
Class to issue blockcerts without relying on filesystem usage.
Please note that it currently only supports anchoring to Ethereum.
"""
def __init__(self, config: 'AttrDict', unsigned_certs: dict):
# 1- Prepare config and unsigned certs (These come from my latest changes in cert-tools
self.config = config
self.config.original_chain = self.config.chain
self.config.chain = Chain.parse_from_chain(self.config.chain)
self.path_to_secret = os.path.join(config.usb_name, config.key_file)
self.unsigned_certs = unsigned_certs
self.cert_generator = self._create_cert_generator()
# 2- Calculate Merkle Tree and Root
self.merkle_tree_generator = MerkleTreeGenerator()
self.merkle_tree_generator.populate(self.cert_generator)
self.merkle_root = self.merkle_tree_generator.get_blockchain_data()
def issue(self) -> Tuple[str, Dict]:
"""Anchor the merkle root in a blockchain transaction and add the tx id and merkle proof to each cert."""
tx_id = self._broadcast_transaction()
signed_certs = self._add_proof_to_certs(tx_id)
return tx_id, signed_certs
def _add_proof_to_certs(self, tx_id) -> Dict:
"""Add merkle proof to the JSON of the certificates."""
proof_generator = self.merkle_tree_generator.get_proof_generator(
tx_id, self.config.chain)
signed_certs = copy.deepcopy(self.unsigned_certs)
for _, cert in signed_certs.items():
proof = next(proof_generator)
cert['signature'] = proof
return signed_certs
def _broadcast_transaction(self) -> str:
"""Broadcast the tx used to anchor a merkle root to a given blockchain."""
self.transaction_handler = SimplifiedEthereumTransactionHandler(
chain=self.config.original_chain.split('_')[1],
path_to_secret=self.path_to_secret,
private_key=self.config.get('eth_private_key'),
recommended_max_cost=self.config.gas_price * self.config.gas_limit,
account_from=self.config.get('eth_public_key')
or self.config.issuing_address,
)
tx_id = self.transaction_handler.issue_transaction(self.merkle_root)
return tx_id
def _create_cert_generator(self) -> Generator:
"""Return a generator of jsonld-normalized unsigned certs."""
for uid, cert in self.unsigned_certs.items():
normalized = normalize_jsonld(cert, detect_unmapped_fields=False)
yield normalized.encode('utf-8')
def test_generate(self):
merkle_tree_generator = MerkleTreeGenerator()
merkle_tree_generator.populate(get_test_data_generator())
byte_array = merkle_tree_generator.get_blockchain_data()
self.assertEqual(b2h(byte_array), '0932f1d2e98219f7d7452801e2b64ebd9e5c005539db12d9b1ddabe7834d9044')
def do_test_signature(self, chain, display_chain, type):
self.maxDiff = None
app_config = mock.Mock()
app_config.issuing_method = "transaction"
merkle_tree_generator = MerkleTreeGenerator()
merkle_tree_generator.populate(get_test_data_generator())
_ = merkle_tree_generator.get_blockchain_data()
gen = merkle_tree_generator.get_proof_generator(
'8087c03e7b7bc9ca7b355de9d9d8165cc5c76307f337f0deb8a204d002c8e582',
'http://example.com', chain)
p1 = next(gen)
_ = next(gen)
p3 = next(gen)
p1_json_proof = {
'path': [{
'right':
'd4735e3a265e16eee03f59718b9b5d03019c07d8b6c51f90da3a666eec13ab35'
}, {
'right':
'4e07408562bedb8b60ce05c1decfe3ad16b72230967de01f640b7e4729b49fce'
}],
'merkleRoot':
'0932f1d2e98219f7d7452801e2b64ebd9e5c005539db12d9b1ddabe7834d9044',
'targetHash':
'6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b',
'anchors': [
helpers.tx_to_blink(
chain,
'8087c03e7b7bc9ca7b355de9d9d8165cc5c76307f337f0deb8a204d002c8e582'
)
]
}
mp2019 = MerkleProof2019()
proof_value = mp2019.encode(p1_json_proof)
p1_expected = {
"type": "MerkleProof2019",
"created": p1['created'],
"proofValue": proof_value.decode('utf8'),
"proofPurpose": "assertionMethod",
"verificationMethod": "http://example.com"
}
p3_json_proof = {
'path': [{
'left':
'4295f72eeb1e3507b8461e240e3b8d18c1e7bd2f1122b11fc9ec40a65894031a'
}],
'merkleRoot':
'0932f1d2e98219f7d7452801e2b64ebd9e5c005539db12d9b1ddabe7834d9044',
'targetHash':
'4e07408562bedb8b60ce05c1decfe3ad16b72230967de01f640b7e4729b49fce',
'anchors': [
helpers.tx_to_blink(
chain,
'8087c03e7b7bc9ca7b355de9d9d8165cc5c76307f337f0deb8a204d002c8e582'
)
]
}
mp2019 = MerkleProof2019()
proof_value = mp2019.encode(p3_json_proof)
p3_expected = {
"type": "MerkleProof2019",
"created": p3['created'],
"proofValue": proof_value.decode('utf8'),
"proofPurpose": "assertionMethod",
"verificationMethod": "http://example.com"
}
self.assertEqual(p1, p1_expected)
self.assertEqual(p3, p3_expected)