aes: remove force-soft feature

It's breaking cross-based builds. See:

#208 (comment)

.github/workflows/aes.yml

@@ -39,7 +39,6 @@ jobs:
       - run: cargo build --release --target ${{ matrix.target }}
       - run: cargo build --release --target ${{ matrix.target }} --features compact
       - run: cargo build --release --target ${{ matrix.target }} --features ctr
-      - run: cargo build --release --target ${{ matrix.target }} --features force-soft
       - run: cargo build --release --target ${{ matrix.target }} --all-features
 
   # Tests for the portable software backend
@@ -74,7 +73,6 @@ jobs:
       - run: cargo test --release --target ${{ matrix.target }}
       - run: cargo test --release --target ${{ matrix.target }} --features compact
       - run: cargo test --release --target ${{ matrix.target }} --features ctr
-      - run: cargo test --release --target ${{ matrix.target }} --features force-soft
       - run: cargo test --release --target ${{ matrix.target }} --all-features
 
   # Tests for the AES-NI backend
@@ -113,7 +111,6 @@ jobs:
       - run: cargo test --release --target ${{ matrix.target }}
       - run: cargo test --release --target ${{ matrix.target }} --features compact
       - run: cargo test --release --target ${{ matrix.target }} --features ctr
-      - run: cargo test --release --target ${{ matrix.target }} --features force-soft
       - run: cargo test --release --target ${{ matrix.target }} --all-features
 
   # Cross-compiled tests
@@ -147,5 +144,4 @@ jobs:
       - run: cross test --release --target ${{ matrix.target }}
       - run: cross test --release --target ${{ matrix.target }} --features compact
       - run: cross test --release --target ${{ matrix.target }} --features ctr
-      - run: cargo test --release --target ${{ matrix.target }} --features force-soft
       - run: cargo test --release --target ${{ matrix.target }} --all-features

aes/Cargo.toml

@@ -27,8 +27,7 @@ cipher = { version = "=0.3.0-pre", features = ["dev"] }
 cpuid-bool = "0.2"
 
 [features]
-compact = [] # Reduce code size at the cost of performance
-force-soft = [] # Disable support for AES hardware intrinsics
+compact = [] # Reduce code size at the cost of slower performance
 
 [package.metadata.docs.rs]
 features = ["ctr"]

aes/src/autodetect.rs

@@ -130,6 +130,7 @@ pub(crate) mod ctr {
             }
 
             mod $module {
+                #[allow(clippy::large_enum_variant)]
                 pub(super) enum Inner {
                     Ni(crate::ni::$name),
                     Soft(crate::soft::$name),

aes/src/lib.rs

@@ -62,10 +62,7 @@
 use cfg_if::cfg_if;
 
 cfg_if! {
-    if #[cfg(all(
-        any(target_arch = "x86_64", target_arch = "x86"),
-        not(feature = "force-soft")
-    ))] {
+    if #[cfg(any(target_arch = "x86_64", target_arch = "x86"))] {
         mod autodetect;
         mod ni;
         mod soft;

aes/src/ni/aes128.rs

@@ -112,6 +112,7 @@ impl BlockDecrypt for Aes128 {
             // Safety: `loadu` and `storeu` support unaligned access
             #[allow(clippy::cast_ptr_alignment)]
             let mut b = _mm_loadu_si128(block.as_ptr() as *const __m128i);
+
             b = _mm_xor_si128(b, keys[10]);
             b = _mm_aesdec_si128(b, keys[9]);
             b = _mm_aesdec_si128(b, keys[8]);
@@ -123,6 +124,9 @@ impl BlockDecrypt for Aes128 {
             b = _mm_aesdec_si128(b, keys[2]);
             b = _mm_aesdec_si128(b, keys[1]);
             b = _mm_aesdeclast_si128(b, keys[0]);
+
+            // Safety: `loadu` and `storeu` support unaligned access
+            #[allow(clippy::cast_ptr_alignment)]
             _mm_storeu_si128(block.as_mut_ptr() as *mut __m128i, b);
         }
 

aes/src/ni/aes192.rs

@@ -114,6 +114,7 @@ impl BlockDecrypt for Aes192 {
             // Safety: `loadu` and `storeu` support unaligned access
             #[allow(clippy::cast_ptr_alignment)]
             let mut b = _mm_loadu_si128(block.as_ptr() as *const __m128i);
+
             b = _mm_xor_si128(b, keys[12]);
             b = _mm_aesdec_si128(b, keys[11]);
             b = _mm_aesdec_si128(b, keys[10]);
@@ -127,6 +128,9 @@ impl BlockDecrypt for Aes192 {
             b = _mm_aesdec_si128(b, keys[2]);
             b = _mm_aesdec_si128(b, keys[1]);
             b = _mm_aesdeclast_si128(b, keys[0]);
+
+            // Safety: `loadu` and `storeu` support unaligned access
+            #[allow(clippy::cast_ptr_alignment)]
             _mm_storeu_si128(block.as_mut_ptr() as *mut __m128i, b);
         }
 

aes/src/ni/aes256.rs

@@ -118,6 +118,7 @@ impl BlockDecrypt for Aes256 {
             // Safety: `loadu` and `storeu` support unaligned access
             #[allow(clippy::cast_ptr_alignment)]
             let mut b = _mm_loadu_si128(block.as_ptr() as *const __m128i);
+
             b = _mm_xor_si128(b, keys[14]);
             b = _mm_aesdec_si128(b, keys[13]);
             b = _mm_aesdec_si128(b, keys[12]);
@@ -133,6 +134,9 @@ impl BlockDecrypt for Aes256 {
             b = _mm_aesdec_si128(b, keys[2]);
             b = _mm_aesdec_si128(b, keys[1]);
             b = _mm_aesdeclast_si128(b, keys[0]);
+
+            // Safety: `loadu` and `storeu` support unaligned access
+            #[allow(clippy::cast_ptr_alignment)]
             _mm_storeu_si128(block.as_mut_ptr() as *mut __m128i, b);
         }