md4: add OID support (#418)

Author: lumag

.github/workflows/md4.yml

@@ -49,7 +49,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.41.0 # MSRV
+          - 1.57.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v3
@@ -63,3 +63,22 @@ jobs:
       - run: cargo test --no-default-features
       - run: cargo test
       - run: cargo test --all-features
+
+  # TODO: merge with test on MSRV bump to 1.57 or higher
+  test-msrv-41:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - 1.41.0 # MSRV
+          - stable
+    steps:
+      - uses: actions/checkout@v3
+      - uses: RustCrypto/actions/cargo-cache@master
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          override: true
+      - run: cargo test --no-default-features
+      - run: cargo test

md4/CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## 0.10.2 (UNRELEASED)
+### Added
+- Feature-gated OID support ([#418])
+
+[#418]: https://github.com/RustCrypto/hashes/pull/418
+
 ## 0.10.1 (2022-02-17)
 ### Fixed
 - Minimal versions build ([#363])

md4/Cargo.toml

@@ -15,9 +15,10 @@ categories = ["cryptography", "no-std"]
 digest = "0.10.3"
 
 [dev-dependencies]
-digest = { version = "0.10.3", features = ["dev"] }
+digest = { version = "0.10.4", features = ["dev"] }
 hex-literal = "0.2.2"
 
 [features]
 default = ["std"]
 std = ["digest/std"]
+oid = ["digest/oid"] # Enable OID support. WARNING: Bumps MSRV to 1.57

md4/src/lib.rs

@@ -35,6 +35,8 @@
 pub use digest::{self, Digest};
 
 use core::{convert::TryInto, fmt};
+#[cfg(feature = "oid")]
+use digest::const_oid::{AssociatedOid, ObjectIdentifier};
 use digest::{
     block_buffer::Eager,
     core_api::{
@@ -122,6 +124,12 @@ impl fmt::Debug for Md4Core {
     }
 }
 
+#[cfg(feature = "oid")]
+#[cfg_attr(docsrs, doc(cfg(feature = "oid")))]
+impl AssociatedOid for Md4Core {
+    const OID: ObjectIdentifier = ObjectIdentifier::new_unwrap("1.2.840.113549.2.4");
+}
+
 /// MD4 hasher state.
 pub type Md4 = CoreWrapper<Md4Core>;