ci: add minimal versions check

.github/workflows/bign256.yml

@@ -112,3 +112,8 @@ jobs:
         with:
           toolchain: stable
       - run: cargo doc --all-features
+
+  check-minimal-versions:
+    uses: ./.github/workflows/check-minimal-versions.yml
+    with:
+      working-directory: bign256

.github/workflows/bp256.yml

@@ -52,14 +52,14 @@ jobs:
           - 1.73.0 # MSRV
           - stable
     steps:
-    - uses: actions/checkout@v4
-    - uses: dtolnay/rust-toolchain@master
-      with:
-        toolchain: ${{ matrix.rust }}
-    - run: cargo check --all-features
-    - run: cargo test --no-default-features
-    - run: cargo test
-    - run: cargo test --all-features
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.rust }}
+      - run: cargo check --all-features
+      - run: cargo test --no-default-features
+      - run: cargo test
+      - run: cargo test --all-features
 
   doc:
     runs-on: ubuntu-latest
@@ -70,3 +70,8 @@ jobs:
         with:
           toolchain: stable
       - run: cargo doc --all-features
+
+  check-minimal-versions:
+    uses: ./.github/workflows/check-minimal-versions.yml
+    with:
+      working-directory: bp256

.github/workflows/bp384.yml

@@ -52,14 +52,14 @@ jobs:
           - 1.73.0 # MSRV
           - stable
     steps:
-    - uses: actions/checkout@v4
-    - uses: dtolnay/rust-toolchain@master
-      with:
-        toolchain: ${{ matrix.rust }}
-    - run: cargo check --all-features
-    - run: cargo test --no-default-features
-    - run: cargo test
-    - run: cargo test --all-features
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.rust }}
+      - run: cargo check --all-features
+      - run: cargo test --no-default-features
+      - run: cargo test
+      - run: cargo test --all-features
 
   doc:
     runs-on: ubuntu-latest
@@ -70,3 +70,8 @@ jobs:
         with:
           toolchain: stable
       - run: cargo doc --all-features
+
+  check-minimal-versions:
+    uses: ./.github/workflows/check-minimal-versions.yml
+    with:
+      working-directory: bp384

.github/workflows/check-minimal-versions.yml

@@ -0,0 +1,28 @@
+# This workflow checks that the project builds and tests successfully with the
+# minimal versions of all dependencies that are compatible with the current
+# Cargo.lock file. This is useful for ensuring that the project is not
+# accidentally relying on newer versions of dependencies than it actually
+# needs.
+
+name: Check minimal versions
+
+on:
+  workflow_call:
+    inputs:
+      working-directory:
+        type: string
+        required: true
+jobs:
+  check-minimal-versions:
+    defaults:
+      run:
+        working-directory: ${{ inputs.working-directory }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: dtolnay/rust-toolchain@nightly
+      - name: cargo update -Zminimal-versions
+        run: cargo +nightly update -Zdirect-minimal-versions
+      - name: cargo test
+        run: cargo test --locked --all-features --all-targets

.github/workflows/k256.yml

@@ -141,3 +141,8 @@ jobs:
         with:
           toolchain: stable
       - run: cargo doc --all-features
+
+  check-minimal-versions:
+    uses: ./.github/workflows/check-minimal-versions.yml
+    with:
+      working-directory: k256

.github/workflows/p192.yml

@@ -82,3 +82,8 @@ jobs:
         with:
           toolchain: stable
       - run: cargo doc --all-features
+
+  check-minimal-versions:
+    uses: ./.github/workflows/check-minimal-versions.yml
+    with:
+      working-directory: p192

.github/workflows/p224.yml

@@ -84,3 +84,8 @@ jobs:
         with:
           toolchain: stable
       - run: cargo doc --all-features
+
+  check-minimal-versions:
+    uses: ./.github/workflows/check-minimal-versions.yml
+    with:
+      working-directory: p224

.github/workflows/p256.yml

@@ -125,3 +125,8 @@ jobs:
         with:
           toolchain: stable
       - run: cargo doc --all-features
+
+  check-minimal-versions:
+    uses: ./.github/workflows/check-minimal-versions.yml
+    with:
+      working-directory: p256

.github/workflows/p384.yml

@@ -121,3 +121,8 @@ jobs:
         with:
           toolchain: stable
       - run: cargo doc --all-features
+
+  check-minimal-versions:
+    uses: ./.github/workflows/check-minimal-versions.yml
+    with:
+      working-directory: p384

.github/workflows/p521.yml

@@ -91,3 +91,8 @@ jobs:
         with:
           toolchain: stable
       - run: cargo doc --all-features
+
+  check-minimal-versions:
+    uses: ./.github/workflows/check-minimal-versions.yml
+    with:
+      working-directory: p521

.github/workflows/primefield.yml

@@ -45,11 +45,11 @@ jobs:
           - 1.73.0 # MSRV
           - stable
     steps:
-    - uses: actions/checkout@v4
-    - uses: dtolnay/rust-toolchain@master
-      with:
-        toolchain: ${{ matrix.rust }}
-    - run: cargo test
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.rust }}
+      - run: cargo test
 
   doc:
     runs-on: ubuntu-latest
@@ -60,3 +60,8 @@ jobs:
         with:
           toolchain: stable
       - run: cargo doc --all-features
+
+  check-minimal-versions:
+    uses: ./.github/workflows/check-minimal-versions.yml
+    with:
+      working-directory: primefield

.github/workflows/primeorder.yml

@@ -46,14 +46,14 @@ jobs:
           - 1.73.0 # MSRV
           - stable
     steps:
-    - uses: actions/checkout@v4
-    - uses: dtolnay/rust-toolchain@master
-      with:
-        toolchain: ${{ matrix.rust }}
-    - run: cargo check --all-features
-    - run: cargo test --no-default-features
-    - run: cargo test
-    - run: cargo test --all-features
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.rust }}
+      - run: cargo check --all-features
+      - run: cargo test --no-default-features
+      - run: cargo test
+      - run: cargo test --all-features
 
   doc:
     runs-on: ubuntu-latest
@@ -64,3 +64,8 @@ jobs:
         with:
           toolchain: stable
       - run: cargo doc --all-features
+
+  check-minimal-versions:
+    uses: ./.github/workflows/check-minimal-versions.yml
+    with:
+      working-directory: primeorder

.github/workflows/sm2.yml

@@ -81,3 +81,8 @@ jobs:
         with:
           toolchain: stable
       - run: cargo doc --all-features
+
+  check-minimal-versions:
+    uses: ./.github/workflows/check-minimal-versions.yml
+    with:
+      working-directory: sm2