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aes: autodetection support for AES-NI
On i686/x86_64 platforms, uses the `cpuid-bool` crate to detect at runtime whether AES-NI is available. This eliminates the need to specify `target_feature=+aes` when compiling the crate in order to take advantage of AES-NI.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,204 @@ | ||
| //! Autodetection support for hardware accelerated AES backends with fallback | ||
| //! to the fixsliced "soft" implementation. | ||
| use crate::{Block, ParBlocks}; | ||
| use cipher::{ | ||
| consts::{U16, U24, U32, U8}, | ||
| generic_array::GenericArray, | ||
| BlockCipher, BlockDecrypt, BlockEncrypt, NewBlockCipher, | ||
| }; | ||
|
|
||
| cpuid_bool::new!(aes_cpuid, "aes"); | ||
|
|
||
| macro_rules! define_aes_impl { | ||
| ( | ||
| $name:tt, | ||
| $module:tt, | ||
| $key_size:ty, | ||
| $doc:expr | ||
| ) => { | ||
| #[doc=$doc] | ||
| #[derive(Clone)] | ||
| pub struct $name { | ||
| inner: $module::Inner, | ||
| token: aes_cpuid::InitToken | ||
| } | ||
|
|
||
| mod $module { | ||
| #[derive(Copy, Clone)] | ||
| pub(super) union Inner { | ||
| pub(super) ni: crate::ni::$name, | ||
| pub(super) soft: crate::soft::$name, | ||
| } | ||
| } | ||
|
|
||
| impl NewBlockCipher for $name { | ||
| type KeySize = $key_size; | ||
|
|
||
| #[inline] | ||
| fn new(key: &GenericArray<u8, $key_size>) -> Self { | ||
| let (token, aesni_present) = aes_cpuid::init_get(); | ||
|
|
||
| let inner = if aesni_present { | ||
| $module::Inner { ni: crate::ni::$name::new(key) } | ||
| } else { | ||
| $module::Inner { soft: crate::soft::$name::new(key) } | ||
| }; | ||
|
|
||
| Self { inner, token } | ||
| } | ||
| } | ||
|
|
||
| impl BlockCipher for $name { | ||
| type BlockSize = U16; | ||
| type ParBlocks = U8; | ||
| } | ||
|
|
||
| impl BlockEncrypt for $name { | ||
| #[inline] | ||
| fn encrypt_block(&self, block: &mut Block) { | ||
| if self.token.get() { | ||
| unsafe { self.inner.ni.encrypt_block(block) } | ||
| } else { | ||
| unsafe { self.inner.soft.encrypt_block(block) } | ||
| } | ||
| } | ||
|
|
||
| #[inline] | ||
| fn encrypt_par_blocks(&self, blocks: &mut ParBlocks) { | ||
| if self.token.get() { | ||
| unsafe { self.inner.ni.encrypt_par_blocks(blocks) } | ||
| } else { | ||
| unsafe { self.inner.soft.encrypt_par_blocks(blocks) } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl BlockDecrypt for $name { | ||
| #[inline] | ||
| fn decrypt_block(&self, block: &mut Block) { | ||
| if self.token.get() { | ||
| unsafe { self.inner.ni.decrypt_block(block) } | ||
| } else { | ||
| unsafe { self.inner.soft.decrypt_block(block) } | ||
| } | ||
| } | ||
|
|
||
| #[inline] | ||
| fn decrypt_par_blocks(&self, blocks: &mut ParBlocks) { | ||
| if self.token.get() { | ||
| unsafe { self.inner.ni.decrypt_par_blocks(blocks) } | ||
| } else { | ||
| unsafe { self.inner.soft.decrypt_par_blocks(blocks) } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| opaque_debug::implement!($name); | ||
| } | ||
| } | ||
|
|
||
| define_aes_impl!(Aes128, aes128, U16, "AES-128 block cipher instance"); | ||
| define_aes_impl!(Aes192, aes192, U24, "AES-192 block cipher instance"); | ||
| define_aes_impl!(Aes256, aes256, U32, "AES-256 block cipher instance"); | ||
|
|
||
| #[cfg(feature = "ctr")] | ||
| pub(crate) mod ctr { | ||
| use super::{Aes128, Aes192, Aes256}; | ||
| use cipher::{ | ||
| block::BlockCipher, | ||
| generic_array::GenericArray, | ||
| stream::{ | ||
| FromBlockCipher, LoopError, OverflowError, SeekNum, SyncStreamCipher, | ||
| SyncStreamCipherSeek, | ||
| }, | ||
| }; | ||
|
|
||
| cpuid_bool::new!(aes_ssse3_cpuid, "aes", "ssse3"); | ||
|
|
||
| macro_rules! define_aes_ctr_impl { | ||
| ( | ||
| $name:tt, | ||
| $cipher:ident, | ||
| $module:tt, | ||
| $doc:expr | ||
| ) => { | ||
| #[doc=$doc] | ||
| #[cfg_attr(docsrs, doc(cfg(feature = "ctr")))] | ||
| pub struct $name { | ||
| inner: $module::Inner, | ||
| } | ||
|
|
||
| mod $module { | ||
| pub(super) enum Inner { | ||
| Ni(crate::ni::$name), | ||
| Soft(crate::soft::$name), | ||
| } | ||
| } | ||
|
|
||
| impl FromBlockCipher for $name { | ||
| type BlockCipher = $cipher; | ||
| type NonceSize = <$cipher as BlockCipher>::BlockSize; | ||
|
|
||
| fn from_block_cipher( | ||
| cipher: $cipher, | ||
| nonce: &GenericArray<u8, Self::NonceSize>, | ||
| ) -> Self { | ||
| let (_, aesni_present) = aes_ssse3_cpuid::init_get(); | ||
|
|
||
| let inner = if aesni_present { | ||
| $module::Inner::Ni( | ||
| crate::ni::$name::from_block_cipher( | ||
| unsafe { cipher.inner.ni }, | ||
| nonce | ||
| ) | ||
| ) | ||
| } else { | ||
| $module::Inner::Soft( | ||
| crate::soft::$name::from_block_cipher( | ||
| unsafe { cipher.inner.soft }, | ||
| nonce | ||
| ) | ||
| ) | ||
| }; | ||
|
|
||
| Self { inner } | ||
| } | ||
| } | ||
|
|
||
| impl SyncStreamCipher for $name { | ||
| #[inline] | ||
| fn try_apply_keystream(&mut self, data: &mut [u8]) -> Result<(), LoopError> { | ||
| match &mut self.inner { | ||
| $module::Inner::Ni(aes) => aes.try_apply_keystream(data), | ||
| $module::Inner::Soft(aes) => aes.try_apply_keystream(data) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl SyncStreamCipherSeek for $name { | ||
| #[inline] | ||
| fn try_current_pos<T: SeekNum>(&self) -> Result<T, OverflowError> { | ||
| match &self.inner { | ||
| $module::Inner::Ni(aes) => aes.try_current_pos(), | ||
| $module::Inner::Soft(aes) => aes.try_current_pos() | ||
| } | ||
| } | ||
|
|
||
| #[inline] | ||
| fn try_seek<T: SeekNum>(&mut self, pos: T) -> Result<(), LoopError> { | ||
| match &mut self.inner { | ||
| $module::Inner::Ni(aes) => aes.try_seek(pos), | ||
| $module::Inner::Soft(aes) => aes.try_seek(pos) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| opaque_debug::implement!($name); | ||
| } | ||
| } | ||
|
|
||
| define_aes_ctr_impl!(Aes128Ctr, Aes128, aes128ctr, "AES-128 in CTR mode"); | ||
| define_aes_ctr_impl!(Aes192Ctr, Aes192, aes192ctr, "AES-192 in CTR mode"); | ||
| define_aes_ctr_impl!(Aes256Ctr, Aes256, aes256ctr, "AES-256 in CTR mode"); | ||
| } |
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