x509-tsp: make crate no_std

Signed-off-by: Arthur Gautier <baloo@superbaloo.net>

Author: baloo

.github/workflows/x509-tsp.yml

@@ -24,6 +24,25 @@ env:
   RUSTFLAGS: "-Dwarnings"
 
 jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - 1.65.0 # MSRV
+          - stable
+        target:
+          - thumbv7em-none-eabi
+          - wasm32-unknown-unknown
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.rust }}
+          targets: ${{ matrix.target }}
+      - uses: RustCrypto/actions/cargo-hack-install@master
+      - run: cargo hack build --target ${{ matrix.target }} --feature-powerset --exclude-features arbitrary,builder,default,std
+
   minimal-versions:
     uses: RustCrypto/actions/.github/workflows/minimal-versions.yml@master
     with:

x509-tsp/Cargo.toml

@@ -8,15 +8,15 @@ Pure Rust implementation of the Timestamping Protocol as described in RFC 3161.
 authors = ["RustCrypto Developers"]
 license = "Apache-2.0 OR MIT"
 repository = "https://github.com/RustCrypto/formats/tree/master/x509-tsp"
-categories = ["cryptography", "encoding", "parser-implementations"]
+categories = ["cryptography", "encoding", "no-std", "parser-implementations"]
 keywords = ["crypto", "tsp", "timestamp"]
 readme = "README.md"
 rust-version = "1.65"
 
 [dependencies]
 der = { version = "0.7.6", features = ["alloc", "derive", "oid", "pem"] }
-cms = { version = "0.2.1", features = ["alloc", "std"] }
-cmpv2 = { version = "0.2", features = ["alloc", "std"] }
+cms = { version = "0.2.1", features = ["alloc"] }
+cmpv2 = { version = "0.2", features = ["alloc"] }
 x509-cert = { version = "0.2.4", default-features = false }
 
 [dev-dependencies]

x509-tsp/src/lib.rs

@@ -1,3 +1,13 @@
+#![no_std]
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+#![doc = include_str!("../README.md")]
+#![doc(
+    html_logo_url = "https://raw.githubusercontent.com/RustCrypto/media/6ee8e381/logo.svg",
+    html_favicon_url = "https://raw.githubusercontent.com/RustCrypto/media/6ee8e381/logo.svg"
+)]
+
+extern crate alloc;
+
 use cmpv2::status::PkiStatusInfo;
 use cms::content_info::ContentInfo;
 use der::{
@@ -131,6 +141,7 @@ pub struct Accuracy {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use alloc::string::ToString;
     use cmpv2::status::*;
     use cms::signed_data::SignedData;
     use der::oid::db::rfc5912::ID_SHA_256;