slh-dsa: bump zerocopy to v0.8

The `AsBytes` trait is gone, and now found on the `IntoBytes` trait.

It needs a new `Immutable` marker trait which says:

> Types which are free from interior mutability.

...so it seems safe to add to the types that previously used `AsBytes`
which are simple data structs.

Author: tarcieri

Cargo.lock

@@ -19,7 +19,7 @@ exclude = ["tests"]
 hybrid-array = { version = "0.4", features = ["extra-sizes"] }
 typenum = { version = "1.17", features = ["const-generics"] }
 sha3 = { version = "0.11.0-rc.0", default-features = false }
-zerocopy = { version = "0.7", features = ["derive"] }
+zerocopy = { version = "0.8", features = ["derive"] }
 rand_core = { version = "0.9" }
 signature = { version = "3.0.0-rc.4", features = ["rand_core"] }
 hmac = "0.13.0-rc.1"

slh-dsa/Cargo.toml

@@ -18,8 +18,10 @@
 use hybrid_array::Array;
 use typenum::U22;
 
-use zerocopy::AsBytes;
-use zerocopy::byteorder::big_endian::{U32, U64};
+use zerocopy::{
+    Immutable, IntoBytes,
+    byteorder::big_endian::{U32, U64},
+};
 
 /// `Address` represents a hash address as defined by FIPS-205 section 4.2
 pub trait Address: AsRef<[u8]> {
@@ -39,7 +41,7 @@ pub trait Address: AsRef<[u8]> {
     }
 }
 
-#[derive(Clone, AsBytes)]
+#[derive(Clone, IntoBytes, Immutable)]
 #[repr(C)]
 pub struct WotsHash {
     pub layer_adrs: U32,
@@ -51,7 +53,7 @@ pub struct WotsHash {
     pub hash_adrs: U32,
 }
 
-#[derive(Clone, AsBytes)]
+#[derive(Clone, IntoBytes, Immutable)]
 #[repr(C)]
 pub struct WotsPk {
     pub layer_adrs: U32,
@@ -62,7 +64,7 @@ pub struct WotsPk {
     padding: U64, // 0
 }
 
-#[derive(Clone, AsBytes)]
+#[derive(Clone, IntoBytes, Immutable)]
 #[repr(C)]
 pub struct HashTree {
     pub layer_adrs: U32,
@@ -74,7 +76,7 @@ pub struct HashTree {
     pub tree_index: U32,
 }
 
-#[derive(Clone, AsBytes)]
+#[derive(Clone, IntoBytes, Immutable)]
 #[repr(C)]
 pub struct ForsTree {
     layer_adrs: U32, // 0
@@ -86,7 +88,7 @@ pub struct ForsTree {
     pub tree_index: U32,
 }
 
-#[derive(Clone, AsBytes)]
+#[derive(Clone, IntoBytes, Immutable)]
 #[repr(C)]
 pub struct ForsRoots {
     layer_adrs: U32, // 0
@@ -97,7 +99,7 @@ pub struct ForsRoots {
     padding: U64, // 0
 }
 
-#[derive(Clone, AsBytes)]
+#[derive(Clone, IntoBytes, Immutable)]
 #[repr(C)]
 pub struct WotsPrf {
     pub layer_adrs: U32,
@@ -109,7 +111,7 @@ pub struct WotsPrf {
     hash_adrs: U32, // 0
 }
 
-#[derive(Clone, AsBytes)]
+#[derive(Clone, IntoBytes, Immutable)]
 #[repr(C)]
 pub struct ForsPrf {
     layer_adrs: U32, // 0