pem-rfc7468: leverage core::error::Error; MSRV 1.81

Allows use of the `Error` trait without the `std` feature enabled, which
was stabilized in Rust 1.81

.github/workflows/pem-rfc7468.yml

@@ -24,7 +24,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.65.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
         target:
           - thumbv7em-none-eabi
@@ -41,14 +41,14 @@ jobs:
   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
     strategy:
       matrix:
         rust:
-          - 1.65.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4

pem-rfc7468/Cargo.toml

@@ -16,7 +16,7 @@ categories = ["cryptography", "data-structures", "encoding", "no-std", "parser-i
 keywords = ["crypto", "key", "pem", "pkcs", "rsa"]
 readme = "README.md"
 edition = "2021"
-rust-version = "1.60"
+rust-version = "1.81"
 
 [dependencies]
 base64ct = { version = "1.4" }

pem-rfc7468/README.md

@@ -58,7 +58,7 @@ to practically extract RSA private keys from SGX enclaves.
 
 ## Minimum Supported Rust Version
 
-This crate requires **Rust 1.60** at a minimum.
+This crate requires **Rust 1.81** at a minimum.
 
 We may change the MSRV in the future, but it will be accompanied by a minor
 version bump.
@@ -87,7 +87,7 @@ dual licensed as above, without any additional terms or conditions.
 [build-image]: https://github.com/RustCrypto/formats/actions/workflows/pem-rfc7468.yml/badge.svg
 [build-link]: https://github.com/RustCrypto/formats/actions/workflows/pem-rfc7468.yml
 [license-image]: https://img.shields.io/badge/license-Apache2.0/MIT-blue.svg
-[rustc-image]: https://img.shields.io/badge/rustc-1.60+-blue.svg
+[rustc-image]: https://img.shields.io/badge/rustc-1.81+-blue.svg
 [chat-image]: https://img.shields.io/badge/zulip-join_chat-blue.svg
 [chat-link]: https://rustcrypto.zulipchat.com/#narrow/stream/300570-formats
 

pem-rfc7468/src/error.rs

@@ -70,8 +70,7 @@ impl fmt::Display for Error {
     }
 }
 
-#[cfg(feature = "std")]
-impl std::error::Error for Error {}
+impl core::error::Error for Error {}
 
 impl From<base64ct::Error> for Error {
     fn from(err: base64ct::Error) -> Error {