Missing file

Signed-off-by: laurentsimon <[email protected]>

Author: laurentsimon

model_signing/_manifest.py

@@ -0,0 +1,60 @@
+# Copyright Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing perepo_managerissions and
+# limitations under the License.
+
+from enum import Enum
+from pathlib import Path
+from typing import IO
+
+import in_toto_attestation.v1.resource_descriptor_pb2 as rdpb
+from in_toto_attestation.v1.statement import Statement
+
+class DigestAlgorithm(Enum):
+    SHA256_P1 = 1
+
+    def __str__(self):
+        return str(self.name).replace("_", "-").lower()
+    @staticmethod
+    def from_string(s: str):
+        return DigestAlgorithm[s.replace("-", "_")]
+
+class Hashed:
+    algorithm: DigestAlgorithm
+    digest: bytes
+    def __init__(self, algorithm_: DigestAlgorithm, digest_: bytes):
+        self.algorithm = algorithm_
+        self.digest = digest_
+
+class PathMetadata:
+    hashed: Hashed
+    path: str
+    def __init__(self, path_: str, hashed_: Hashed):
+        self.path = path_
+        self.hashed = hashed_
+
+class Manifest:
+    paths: PathMetadata
+    predicate_type: str
+    def __init__(self, paths: [PathMetadata]):
+        self.paths = paths
+        self.predicate_type = "https://github.com/google/model-transparency/manifest/v1"
+
+    def to_intoto_statement(self) -> Statement:
+        subjects: [rdpb.ResourceDescriptor] = []
+        for _, p in enumerate(self.paths):
+            sub = rdpb.ResourceDescriptor()
+            sub.download_location = p.path
+            sub.digest[str(p.hashed.algorithm)] = p.hashed.digest.hex()
+            subjects += [sub]
+        # See example at https://github.com/in-toto/attestation/blob/main/python/tests/test_statement.py.
+        return Statement(subjects, self.predicate_type, {})