sigstore: fixup exc types

Signed-off-by: William Woodruff <william@trailofbits.com>

Author: woodruffw

sigstore/_cli.py

@@ -839,7 +839,7 @@ def _verify_identity(args: argparse.Namespace) -> None:
                 )
 
             print(f"OK: {file}")
-        except VerificationError as exc:
+        except Error as exc:
             _logger.error(f"FAIL: {file}")
             exc.log_and_exit(_logger, args.verbose >= 1)
 
@@ -896,7 +896,7 @@ def _verify_github(args: argparse.Namespace) -> None:
                     policy=policy_,
                 )
             print(f"OK: {file}")
-        except VerificationError as exc:
+        except Error as exc:
             _logger.error(f"FAIL: {file}")
             exc.log_and_exit(_logger, args.verbose >= 1)
 

sigstore/dsse.py

@@ -29,7 +29,7 @@
 from sigstore_protobuf_specs.io.intoto import Envelope as _Envelope
 from sigstore_protobuf_specs.io.intoto import Signature
 
-from sigstore.errors import VerificationError
+from sigstore.errors import Error, VerificationError
 from sigstore.hashes import Hashed
 
 _logger = logging.getLogger(__name__)
@@ -101,7 +101,7 @@ def __init__(self, contents: bytes) -> None:
         try:
             self._inner = _Statement.model_validate_json(contents)
         except ValidationError:
-            raise ValueError("malformed in-toto statement")
+            raise Error("malformed in-toto statement")
 
     def _matches_digest(self, digest: Hashed) -> bool:
         """
@@ -181,7 +181,7 @@ def build(self) -> Statement:
                 predicate=self._predicate,
             )
         except ValidationError as e:
-            raise ValueError(f"invalid statement: {e}")
+            raise Error(f"invalid statement: {e}")
 
         return Statement(stmt.model_dump_json(by_alias=True).encode())