Payload checksum type is not fixed

[carpawell]

Object header has payload checksums (not a homomorphic one) and there is no restriction about hashing algorithm. However, in practice, it is fixed and there is no sense in using TZ hash in regular hashing.

Current Behavior

Hash is not fixed and our nodes' behavior is undefined if we meet such objects. E.g., it is impossible to search by such hashes: https://github.com/nspcc-dev/neofs-sdk-go/blob/256513c1b29bbb59326eecdc0ae669cc67e33155/object/search.go#L336-L341.

Expected Behavior

Objects hashing with any algo that is not sha256 should be prohibited.

Possible Solution

Add comments to this field.

Steps to Reproduce

Use your eyes, look at

neofs-api/object/types.proto

Lines 87 to 88 in 01229b4

	// Hash of payload bytes
	neo.fs.v2.refs.Checksum payload_hash = 6 [json_name = "payloadHash"];

.

Regression

No.