pkcs5: remove std feature

.github/workflows/pkcs5.yml

@@ -43,12 +43,12 @@ jobs:
           toolchain: ${{ matrix.rust }}
           targets: ${{ matrix.target }}
       - uses: RustCrypto/actions/cargo-hack-install@master
-      - run: cargo hack build --target ${{ matrix.target }} --feature-powerset --exclude-features getrandom,std
+      - run: cargo hack build --target ${{ matrix.target }} --feature-powerset --exclude-features getrandom
 
   minimal-versions:
     uses: RustCrypto/actions/.github/workflows/minimal-versions.yml@master
     with:
-        working-directory: ${{ github.workflow }}
+      working-directory: ${{ github.workflow }}
 
   test:
     runs-on: ubuntu-latest

pkcs5/Cargo.toml

@@ -34,7 +34,6 @@ hex-literal = "1"
 
 [features]
 alloc = []
-std = []
 
 3des = ["dep:des", "pbes2"]
 des-insecure = ["dep:des", "pbes2"]

pkcs5/src/error.rs

@@ -36,8 +36,7 @@ pub enum Error {
     },
 }
 
-#[cfg(feature = "std")]
-impl std::error::Error for Error {}
+impl core::error::Error for Error {}
 
 impl fmt::Display for Error {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {

pkcs5/src/lib.rs

@@ -29,9 +29,6 @@
 #[cfg(all(feature = "alloc", feature = "pbes2"))]
 extern crate alloc;
 
-#[cfg(feature = "std")]
-extern crate std;
-
 mod error;
 
 pub mod pbes1;