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Implement crypto byte array newtypes in term of a shared type (#3684)

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Introduces `CryptoBytes` type defined as:

```rust
pub struct CryptoBytes<const N: usize, Tag = ()>(pub [u8; N], PhantomData<fn() -> Tag>);
```

The type implements a bunch of methods and traits which are typically
expected from a byte array newtype
(NOTE: some of the methods and trait implementations IMO are a bit
redundant, but I decided to maintain them all to not change too much
stuff in this PR)

It also introduces two (generic) typical consumers of `CryptoBytes`:
`PublicBytes` and `SignatureBytes`.

```rust
pub struct PublicTag;
pub PublicBytes<const N: usize, CryptoTag> = CryptoBytes<N, (PublicTag, CryptoTag)>;

pub struct SignatureTag;
pub SignatureBytes<const N: usize, CryptoTag> = CryptoBytes<N, (SignatureTag, CryptoTag)>;
```

Both of them use a tag to differentiate the two types at a higher level.
Downstream specializations will further specialize using a dedicated
crypto tag. For example in ECDSA:


```rust
pub struct EcdsaTag;

pub type Public = PublicBytes<PUBLIC_KEY_SERIALIZED_SIZE, EcdsaTag>;
pub type Signature = PublicBytes<PUBLIC_KEY_SERIALIZED_SIZE, EcdsaTag>;
```

Overall we have a cleaner and most importantly **consistent** code for
all the types involved

All these details are opaque to the end user which can use `Public` and
`Signature` for the cryptos as before
This commit is contained in:
Davide Galassi
2024-03-19 16:47:42 +01:00
committed by GitHub
parent 5fd72a1f5e
commit 1e9fd23776
29 changed files with 492 additions and 1163 deletions
Download Patch File Download Diff File Expand all files Collapse all files
substrate/frame/support/test/tests/pallet_ui/storage_ensure_span_are_ok_on_wrong_gen.stderr
+6 -6
View File
@@ -13,8 +13,8 @@ error[E0277]: the trait bound `Bar: WrapperTypeDecode` is not satisfied
|
= help: the following other types implement trait `WrapperTypeDecode`:
Box<T>
Rc<T>
frame_support::sp_runtime::sp_application_crypto::sp_core::Bytes
Rc<T>
Arc<T>
= note: required for `Bar` to implement `Decode`
= note: required for `Bar` to implement `FullCodec`
@@ -65,8 +65,8 @@ error[E0277]: the trait bound `Bar: WrapperTypeEncode` is not satisfied
bytes::bytes::Bytes
Cow<'a, T>
parity_scale_codec::Ref<'a, T, U>
Rc<T>
frame_support::sp_runtime::sp_application_crypto::sp_core::Bytes
Rc<T>
Arc<T>
Vec<T>
and $N others
@@ -106,8 +106,8 @@ error[E0277]: the trait bound `Bar: WrapperTypeDecode` is not satisfied
|
= help: the following other types implement trait `WrapperTypeDecode`:
Box<T>
Rc<T>
frame_support::sp_runtime::sp_application_crypto::sp_core::Bytes
Rc<T>
Arc<T>
= note: required for `Bar` to implement `Decode`
= note: required for `Bar` to implement `FullCodec`
@@ -148,8 +148,8 @@ error[E0277]: the trait bound `Bar: WrapperTypeEncode` is not satisfied
bytes::bytes::Bytes
Cow<'a, T>
parity_scale_codec::Ref<'a, T, U>
Rc<T>
frame_support::sp_runtime::sp_application_crypto::sp_core::Bytes
Rc<T>
Arc<T>
Vec<T>
and $N others
@@ -168,8 +168,8 @@ error[E0277]: the trait bound `Bar: WrapperTypeDecode` is not satisfied
|
= help: the following other types implement trait `WrapperTypeDecode`:
Box<T>
Rc<T>
frame_support::sp_runtime::sp_application_crypto::sp_core::Bytes
Rc<T>
Arc<T>
= note: required for `Bar` to implement `Decode`
= note: required for `Bar` to implement `FullCodec`
@@ -210,8 +210,8 @@ error[E0277]: the trait bound `Bar: WrapperTypeEncode` is not satisfied
bytes::bytes::Bytes
Cow<'a, T>
parity_scale_codec::Ref<'a, T, U>
Rc<T>
frame_support::sp_runtime::sp_application_crypto::sp_core::Bytes
Rc<T>
Arc<T>
Vec<T>
and $N others
substrate/frame/support/test/tests/pallet_ui/storage_ensure_span_are_ok_on_wrong_gen_unnamed.stderr
+6 -6
View File
@@ -13,8 +13,8 @@ error[E0277]: the trait bound `Bar: WrapperTypeDecode` is not satisfied
|
= help: the following other types implement trait `WrapperTypeDecode`:
Box<T>
Rc<T>
frame_support::sp_runtime::sp_application_crypto::sp_core::Bytes
Rc<T>
Arc<T>
= note: required for `Bar` to implement `Decode`
= note: required for `Bar` to implement `FullCodec`
@@ -65,8 +65,8 @@ error[E0277]: the trait bound `Bar: WrapperTypeEncode` is not satisfied
bytes::bytes::Bytes
Cow<'a, T>
parity_scale_codec::Ref<'a, T, U>
Rc<T>
frame_support::sp_runtime::sp_application_crypto::sp_core::Bytes
Rc<T>
Arc<T>
Vec<T>
and $N others
@@ -106,8 +106,8 @@ error[E0277]: the trait bound `Bar: WrapperTypeDecode` is not satisfied
|
= help: the following other types implement trait `WrapperTypeDecode`:
Box<T>
Rc<T>
frame_support::sp_runtime::sp_application_crypto::sp_core::Bytes
Rc<T>
Arc<T>
= note: required for `Bar` to implement `Decode`
= note: required for `Bar` to implement `FullCodec`
@@ -148,8 +148,8 @@ error[E0277]: the trait bound `Bar: WrapperTypeEncode` is not satisfied
bytes::bytes::Bytes
Cow<'a, T>
parity_scale_codec::Ref<'a, T, U>
Rc<T>
frame_support::sp_runtime::sp_application_crypto::sp_core::Bytes
Rc<T>
Arc<T>
Vec<T>
and $N others
@@ -168,8 +168,8 @@ error[E0277]: the trait bound `Bar: WrapperTypeDecode` is not satisfied
|
= help: the following other types implement trait `WrapperTypeDecode`:
Box<T>
Rc<T>
frame_support::sp_runtime::sp_application_crypto::sp_core::Bytes
Rc<T>
Arc<T>
= note: required for `Bar` to implement `Decode`
= note: required for `Bar` to implement `FullCodec`
@@ -210,8 +210,8 @@ error[E0277]: the trait bound `Bar: WrapperTypeEncode` is not satisfied
bytes::bytes::Bytes
Cow<'a, T>
parity_scale_codec::Ref<'a, T, U>
Rc<T>
frame_support::sp_runtime::sp_application_crypto::sp_core::Bytes
Rc<T>
Arc<T>
Vec<T>
and $N others