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feat: add SHA-256 contentAddress to identity document #9

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Merged
litzki-systems merged 2 commits into from
Jun 23, 2026
+8 −4
Merged

feat: add SHA-256 contentAddress to identity document #9

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bb10d6a
feat: add SHA-256 contentAddress to identity document
claude Jun 23, 2026
aa48221
refactor: eliminate duplicate signing path in generate_identity_document
claude Jun 23, 2026
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12 changes: 8 additions & 4 deletions sovp/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
from __future__ import annotations

import base64
import hashlib
import jcs
import uuid
from datetime import datetime, timezone, timedelta
Expand All @@ -13,7 +14,7 @@
# Per draft Section 4: integrity_proof is excluded because the signature
# cannot cover itself. Per draft V02 item 10: vendor extension objects
# (e.g. scan) MUST NOT be included in the signed scope.
_OUT_OF_SCOPE_KEYS = frozenset({"integrity_proof", "scan"})
_OUT_OF_SCOPE_KEYS = frozenset({"integrity_proof", "scan", "contentAddress"})
from cryptography.hazmat.primitives.asymmetric import ed25519
from cryptography.hazmat.primitives import serialization
from cryptography.exceptions import InvalidSignature
Expand Down Expand Up @@ -177,13 +178,16 @@ def generate_identity_document(
},
}

priv_bytes = base64.b64decode(private_key_b64)
private_key = ed25519.Ed25519PrivateKey.from_private_bytes(priv_bytes)
canonical_data = jcs.canonicalize(non_proof)
signature = base64.b64encode(private_key.sign(canonical_data)).decode("utf-8")
signature = sign_identity(private_key_b64, non_proof)
digest = hashlib.sha256(canonical_data).hexdigest()

document = {
**non_proof,
"contentAddress": {
"alg": "sha256",
"digest": digest,
},
"integrity_proof": {
"signature": signature,
"created": created,
Expand Down