1 files changed, 127 insertions, 0 deletions
diff --git a/rust/vendor/aes/src/soft.rs b/rust/vendor/aes/src/soft.rs
new file mode 100644
index 0000000..1b51d22
--- /dev/null
+++ b/rust/vendor/aes/src/soft.rs
@@ -0,0 +1,127 @@
+//! AES block cipher constant-time implementation.
+//!
+//! The implementation uses a technique called [fixslicing][1], an improved
+//! form of bitslicing which represents ciphers in a way which enables
+//! very efficient constant-time implementations in software.
+//!
+//! [1]: https://eprint.iacr.org/2020/1123.pdf
+
+#![deny(unsafe_code)]
+
+#[cfg_attr(not(target_pointer_width = "64"), path = "soft/fixslice32.rs")]
+#[cfg_attr(target_pointer_width = "64", path = "soft/fixslice64.rs")]
+pub(crate) mod fixslice;
+
+#[cfg(feature = "ctr")]
+mod ctr;
+
+#[cfg(feature = "ctr")]
+pub use self::ctr::{Aes128Ctr, Aes192Ctr, Aes256Ctr};
+
+use crate::{Block, ParBlocks};
+use cipher::{
+    consts::{U16, U24, U32, U8},
+    generic_array::GenericArray,
+    BlockCipher, BlockDecrypt, BlockEncrypt, NewBlockCipher,
+};
+use fixslice::{FixsliceKeys128, FixsliceKeys192, FixsliceKeys256, FIXSLICE_BLOCKS};
+
+macro_rules! define_aes_impl {
+    (
+        $name:ident,
+        $key_size:ty,
+        $fixslice_keys:ty,
+        $fixslice_key_schedule:path,
+        $fixslice_decrypt:path,
+        $fixslice_encrypt:path,
+        $doc:expr
+    ) => {
+        #[doc=$doc]
+        #[derive(Clone)]
+        pub struct $name {
+            keys: $fixslice_keys,
+        }
+
+        impl NewBlockCipher for $name {
+            type KeySize = $key_size;
+
+            #[inline]
+            fn new(key: &GenericArray<u8, $key_size>) -> Self {
+                Self {
+                    keys: $fixslice_key_schedule(key),
+                }
+            }
+        }
+
+        impl BlockCipher for $name {
+            type BlockSize = U16;
+            type ParBlocks = U8;
+        }
+
+        impl BlockEncrypt for $name {
+            #[inline]
+            fn encrypt_block(&self, block: &mut Block) {
+                let mut blocks = [Block::default(); FIXSLICE_BLOCKS];
+                blocks[0].copy_from_slice(block);
+                $fixslice_encrypt(&self.keys, &mut blocks);
+                block.copy_from_slice(&blocks[0]);
+            }
+
+            #[inline]
+            fn encrypt_par_blocks(&self, blocks: &mut ParBlocks) {
+                for chunk in blocks.chunks_mut(FIXSLICE_BLOCKS) {
+                    $fixslice_encrypt(&self.keys, chunk);
+                }
+            }
+        }
+
+        impl BlockDecrypt for $name {
+            #[inline]
+            fn decrypt_block(&self, block: &mut Block) {
+                let mut blocks = [Block::default(); FIXSLICE_BLOCKS];
+                blocks[0].copy_from_slice(block);
+                $fixslice_decrypt(&self.keys, &mut blocks);
+                block.copy_from_slice(&blocks[0]);
+            }
+
+            #[inline]
+            fn decrypt_par_blocks(&self, blocks: &mut ParBlocks) {
+                for chunk in blocks.chunks_mut(FIXSLICE_BLOCKS) {
+                    $fixslice_decrypt(&self.keys, chunk);
+                }
+            }
+        }
+
+        opaque_debug::implement!($name);
+    };
+}
+
+define_aes_impl!(
+    Aes128,
+    U16,
+    FixsliceKeys128,
+    fixslice::aes128_key_schedule,
+    fixslice::aes128_decrypt,
+    fixslice::aes128_encrypt,
+    "AES-128 block cipher instance"
+);
+
+define_aes_impl!(
+    Aes192,
+    U24,
+    FixsliceKeys192,
+    fixslice::aes192_key_schedule,
+    fixslice::aes192_decrypt,
+    fixslice::aes192_encrypt,
+    "AES-192 block cipher instance"
+);
+
+define_aes_impl!(
+    Aes256,
+    U32,
+    FixsliceKeys256,
+    fixslice::aes256_key_schedule,
+    fixslice::aes256_decrypt,
+    fixslice::aes256_encrypt,
+    "AES-256 block cipher instance"
+);