Fix #94 + Add slow-hash to CI (#96)

* Fixes #94

* add slow-hash testing to CI

.github/workflows/main.yml

@@ -35,26 +35,6 @@ jobs:
           command: test
           args: --no-default-features --features ${{ matrix.backend_feature }}
 
-  simple-login-test:
-    runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-    name: test simple_login command-line example
-    steps:
-      - name: install expect
-        run: sudo apt-get install expect
-      - name: Checkout sources
-        uses: actions/checkout@v2
-      - name: install rust
-        uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: nightly
-          override: true
-          components: rustfmt, clippy
-      - name: Run expect (which then runs cargo run)
-        run: expect -f scripts/simple_login.exp
-
   cross-test:
     name: Test on ${{ matrix.target }} (using cross)
     runs-on: ubuntu-latest
@@ -75,6 +55,42 @@ jobs:
       # pass the `--target=${{ matrix.target }}` arg. (Yes, really).
       - run: cross test --verbose --target=${{ matrix.target }} --no-default-features --features ${{ matrix.backend_feature }}
 
+
+  slow-hash-test:
+    name: Test on ${{ matrix.target }} with slow hash
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        backend_feature:
+          - u64_backend
+          - u32_backend
+    steps:
+      - uses: actions/checkout@v2
+      - uses: hecrj/setup-rust-action@v1
+      - run: cargo test --verbose --features slow-hash --no-default-features --features ${{ matrix.backend_feature }}
+
+
+  simple-login-test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+    name: test simple_login command-line example
+    steps:
+      - name: install expect
+        run: sudo apt-get install expect
+      - name: Checkout sources
+        uses: actions/checkout@v2
+      - name: install rust
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly
+          override: true
+          components: rustfmt, clippy
+      - name: Run expect (which then runs cargo run)
+        run: expect -f scripts/simple_login.exp
+
   benches:
     name: cargo bench compilation
     runs-on: ubuntu-latest

src/slow_hash.rs

@@ -7,6 +7,8 @@
 
 use crate::{errors::InternalPakeError, hash::Hash};
 use digest::Digest;
+#[cfg(feature = "slow-hash")]
+use generic_array::typenum::Unsigned;
 use generic_array::GenericArray;
 
 /// Used for the slow hashing function in OPAQUE
@@ -34,9 +36,9 @@ impl<D: Hash> SlowHash<D> for scrypt::ScryptParams {
         input: GenericArray<u8, <D as Digest>::OutputSize>,
     ) -> Result<Vec<u8>, InternalPakeError> {
         let params = scrypt::ScryptParams::new(15, 8, 1).unwrap();
-        let mut output = [0u8; <D as Digest>::OutputSize::to_usize()];
+        let mut output = vec![0u8; <D as Digest>::OutputSize::to_usize()];
         scrypt::scrypt(&input, &[], &params, &mut output)
             .map_err(|_| InternalPakeError::SlowHashError)?;
-        Ok(output.to_vec())
+        Ok(output)
     }
 }