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唐小鸭
6633c80151
* refactor(kms): share the DEK spec mapping and stop re-parsing opened envelopes
- generate_key_material is now the single spec->length mapping for every
backend that mints DEKs itself; the inline copies in the Static and Local
backends are gone, and ChaCha20 (32 bytes, same as AES_256) is accepted
uniformly instead of only by Static.
- The pub(crate) client decrypt of the Local, Vault KV2 and Vault Transit
backends returns (plaintext, master_key_id), so KmsBackend::decrypt no
longer re-parses the envelope it just opened (one JSON parse per SSE GET
instead of two, and unknown-field observability is no longer double-counted).
- Malformed-envelope parse failures now report CryptographicError("parse")
on all backends; Local was the last one mapping them to SerializationError.
- The four KmsBackend::generate_data_key adapters take fields out of
DataKeyInfo instead of cloning, dropping a redundant un-zeroized plaintext
DEK copy and a full ciphertext clone per call; a missing plaintext now
fails closed everywhere instead of returning an empty key on three of four
backends.
* test(kms): pin legacy header fallback, stored-AAD, and decrypt key-id contracts
- a_legacy_aws_kms_object_without_the_cipher_header_still_opens rebuilds the
true pre-internal-header shape (aws:kms mode + S3 key-id header, no
x-rustfs-* headers) and asserts the fallback normalizes the cipher and
re-projects it.
- a_rewritten_sse_c_context_header_fails_authentication is the SSE-C flank of
the stored-AAD tamper check; metadata_without_stored_context_bytes_still_opens
covers the derived-AAD path for both flavours and pins the seal side to the
canonical bytes (mutation-verified).
- data_key_spec_controls_the_length_of_the_generated_key requires every
backend in the matrix to honour all three specs, asserts the envelope
records the requested spec, and round-trips each blob.
- corrupt_ciphertext_fails_cleanly pins unparseable ciphertext to
CryptographicError instead of merely not-InternalError.
- Deleted the never-called assert_validation_error / assert_cryptographic_error
helpers.