Fix salt derivation and KDF byte derivation

README.md

@@ -110,6 +110,10 @@ Keys could be associated with tags. Keyrings are used primarily to store keys in
 
 Using very strong Argon_v2id, and adjustable complexity. Allows storing password key derivation parameters (included in the generated symmetric keys) to re-derive keys later, allows multiple keys derivation. All structures meant to be stored are serializable.
 
+KDF convenience constructors accept salt bytes directly. When the provided salt is not exactly the Argon salt size, it is deterministically normalized with `Hash.Blake2b.deriveSaltFormBytes(...)` before the KDF is created; exact-size salts are used as is.
+
+`KDF.deriveFromBytes(source)` derives exactly the configured KDF key size. Create the KDF with the required key size first, for example through `KDF.createDefault(...)` or `Complexity.kdfForSizeInBytes(...)`.
+
 ## Unified keys hierarchy
 
 Allows the application code to use proper key abstraction and work with more key types in the future, e.g. `SigningKey`, `VerifyingKey`, `EncryptingKey` and `DecryptingKey`. Effective key generation and random byte sequence producers.
@@ -133,4 +137,4 @@ you need to obtain a license from https://8-rays.dev or [Sergey Chernov]. For op
 
 It will be moved to open source; we also guarantee that it will be moved to open source immediately if the software export restrictions will be lifted. We do not support such practices here at 8-rays.dev and assume open source must be open.
 
-[Sergey Chernov]: https://t.me/real_sergeych
+[Sergey Chernov]: https://t.me/real_sergeych