diff options
Diffstat (limited to 'third_party/rust/block-buffer')
| -rw-r--r-- | third_party/rust/block-buffer/.cargo-checksum.json | 1 | ||||
| -rw-r--r-- | third_party/rust/block-buffer/Cargo.toml | 36 | ||||
| -rw-r--r-- | third_party/rust/block-buffer/LICENSE-APACHE | 201 | ||||
| -rw-r--r-- | third_party/rust/block-buffer/LICENSE-MIT | 25 | ||||
| -rw-r--r-- | third_party/rust/block-buffer/src/lib.rs | 210 |
5 files changed, 473 insertions, 0 deletions
diff --git a/third_party/rust/block-buffer/.cargo-checksum.json b/third_party/rust/block-buffer/.cargo-checksum.json new file mode 100644 index 0000000000..779d602b1b --- /dev/null +++ b/third_party/rust/block-buffer/.cargo-checksum.json @@ -0,0 +1 @@ +{"files":{"Cargo.toml":"e4e9e182794c2185438af0c505714df9e051d1d1b17aec7a42265be672b1d027","LICENSE-APACHE":"a9040321c3712d8fd0b09cf52b17445de04a23a10165049ae187cd39e5c86be5","LICENSE-MIT":"d5c22aa3118d240e877ad41c5d9fa232f9c77d757d4aac0c2f943afc0a95e0ef","src/lib.rs":"59dd4084e456153bee968153ee45e34c8e853abfb756a53571c5844ccaf18c23"},"package":"c0940dc441f31689269e10ac70eb1002a3a1d3ad1390e030043662eb7fe4688b"}
\ No newline at end of file diff --git a/third_party/rust/block-buffer/Cargo.toml b/third_party/rust/block-buffer/Cargo.toml new file mode 100644 index 0000000000..6b10954cbb --- /dev/null +++ b/third_party/rust/block-buffer/Cargo.toml @@ -0,0 +1,36 @@ +# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO +# +# When uploading crates to the registry Cargo will automatically +# "normalize" Cargo.toml files for maximal compatibility +# with all versions of Cargo and also rewrite `path` dependencies +# to registry (e.g., crates.io) dependencies +# +# If you believe there's an error in this file please file an +# issue against the rust-lang/cargo repository. If you're +# editing this file be aware that the upstream Cargo.toml +# will likely look very different (and much more reasonable) + +[package] +name = "block-buffer" +version = "0.7.3" +authors = ["RustCrypto Developers"] +description = "Fixed size buffer for block processing of data" +documentation = "https://docs.rs/block-buffer" +keywords = ["block", "buffer"] +categories = ["cryptography", "no-std"] +license = "MIT OR Apache-2.0" +repository = "https://github.com/RustCrypto/utils" +[dependencies.block-padding] +version = "0.1" + +[dependencies.byte-tools] +version = "0.3" + +[dependencies.byteorder] +version = "1.1" +default-features = false + +[dependencies.generic-array] +version = "0.12" +[badges.travis-ci] +repository = "RustCrypto/utils" diff --git a/third_party/rust/block-buffer/LICENSE-APACHE b/third_party/rust/block-buffer/LICENSE-APACHE new file mode 100644 index 0000000000..78173fa2e7 --- /dev/null +++ b/third_party/rust/block-buffer/LICENSE-APACHE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + +TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + +1. 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IN NO EVENT +SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY +CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR +IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER +DEALINGS IN THE SOFTWARE. diff --git a/third_party/rust/block-buffer/src/lib.rs b/third_party/rust/block-buffer/src/lib.rs new file mode 100644 index 0000000000..d3b6916554 --- /dev/null +++ b/third_party/rust/block-buffer/src/lib.rs @@ -0,0 +1,210 @@ +#![no_std] +pub extern crate byteorder; +pub extern crate block_padding; +pub extern crate generic_array; +extern crate byte_tools; + +use byteorder::{ByteOrder, BE}; +use byte_tools::zero; +use block_padding::{Padding, PadError}; +use generic_array::{GenericArray, ArrayLength}; +use core::slice; + +/// Buffer for block processing of data +#[derive(Clone, Default)] +pub struct BlockBuffer<BlockSize: ArrayLength<u8>> { + buffer: GenericArray<u8, BlockSize>, + pos: usize, +} + +#[inline(always)] +unsafe fn cast<N: ArrayLength<u8>>(block: &[u8]) -> &GenericArray<u8, N> { + debug_assert_eq!(block.len(), N::to_usize()); + &*(block.as_ptr() as *const GenericArray<u8, N>) +} + + + +impl<BlockSize: ArrayLength<u8>> BlockBuffer<BlockSize> { + /// Process data in `input` in blocks of size `BlockSize` using function `f`. + #[inline] + pub fn input<F>(&mut self, mut input: &[u8], mut f: F) + where F: FnMut(&GenericArray<u8, BlockSize>) + { + // If there is already data in the buffer, process it if we have + // enough to complete the chunk. + let rem = self.remaining(); + if self.pos != 0 && input.len() >= rem { + let (l, r) = input.split_at(rem); + input = r; + self.buffer[self.pos..].copy_from_slice(l); + self.pos = 0; + f(&self.buffer); + } + + // While we have at least a full buffer size chunks's worth of data, + // process that data without copying it into the buffer + while input.len() >= self.size() { + let (block, r) = input.split_at(self.size()); + input = r; + f(unsafe { cast(block) }); + } + + // Copy any remaining data into the buffer. + self.buffer[self.pos..self.pos+input.len()].copy_from_slice(input); + self.pos += input.len(); + } + + /* + /// Process data in `input` in blocks of size `BlockSize` using function `f`, which accepts + /// slice of blocks. + #[inline] + pub fn input2<F>(&mut self, mut input: &[u8], mut f: F) + where F: FnMut(&[GenericArray<u8, BlockSize>]) + { + // If there is already data in the buffer, process it if we have + // enough to complete the chunk. + let rem = self.remaining(); + if self.pos != 0 && input.len() >= rem { + let (l, r) = input.split_at(rem); + input = r; + self.buffer[self.pos..].copy_from_slice(l); + self.pos = 0; + f(slice::from_ref(&self.buffer)); + } + + // While we have at least a full buffer size chunks's worth of data, + // process it data without copying into the buffer + let n_blocks = input.len()/self.size(); + let (left, right) = input.split_at(n_blocks*self.size()); + // safe because we guarantee that `blocks` does not point outside of `input` + let blocks = unsafe { + slice::from_raw_parts( + left.as_ptr() as *const GenericArray<u8, BlockSize>, + n_blocks, + ) + }; + f(blocks); + + // Copy remaining data into the buffer. + self.buffer[self.pos..self.pos+right.len()].copy_from_slice(right); + self.pos += right.len(); + } + */ + + /// Variant that doesn't flush the buffer until there's additional + /// data to be processed. Suitable for tweakable block ciphers + /// like Threefish that need to know whether a block is the *last* + /// data block before processing it. + #[inline] + pub fn input_lazy<F>(&mut self, mut input: &[u8], mut f: F) + where F: FnMut(&GenericArray<u8, BlockSize>) + { + let rem = self.remaining(); + if self.pos != 0 && input.len() > rem { + let (l, r) = input.split_at(rem); + input = r; + self.buffer[self.pos..].copy_from_slice(l); + self.pos = 0; + f(&self.buffer); + } + + while input.len() > self.size() { + let (block, r) = input.split_at(self.size()); + input = r; + f(unsafe { cast(block) }); + } + + self.buffer[self.pos..self.pos+input.len()].copy_from_slice(input); + self.pos += input.len(); + } + + /// Pad buffer with `prefix` and make sure that internall buffer + /// has at least `up_to` free bytes. All remaining bytes get + /// zeroed-out. + #[inline] + fn digest_pad<F>(&mut self, up_to: usize, f: &mut F) + where F: FnMut(&GenericArray<u8, BlockSize>) + { + if self.pos == self.size() { + f(&self.buffer); + self.pos = 0; + } + self.buffer[self.pos] = 0x80; + self.pos += 1; + + zero(&mut self.buffer[self.pos..]); + + if self.remaining() < up_to { + f(&self.buffer); + zero(&mut self.buffer[..self.pos]); + } + } + + /// Pad message with 0x80, zeros and 64-bit message length + /// in a byte order specified by `B` + #[inline] + pub fn len64_padding<B, F>(&mut self, data_len: u64, mut f: F) + where B: ByteOrder, F: FnMut(&GenericArray<u8, BlockSize>) + { + // TODO: replace `F` with `impl Trait` on MSRV bump + self.digest_pad(8, &mut f); + let s = self.size(); + B::write_u64(&mut self.buffer[s-8..], data_len); + f(&self.buffer); + self.pos = 0; + } + + + /// Pad message with 0x80, zeros and 128-bit message length + /// in the big-endian byte order + #[inline] + pub fn len128_padding_be<F>(&mut self, hi: u64, lo: u64, mut f: F) + where F: FnMut(&GenericArray<u8, BlockSize>) + { + // TODO: on MSRV bump replace `F` with `impl Trait`, use `u128`, add `B` + self.digest_pad(16, &mut f); + let s = self.size(); + BE::write_u64(&mut self.buffer[s-16..s-8], hi); + BE::write_u64(&mut self.buffer[s-8..], lo); + f(&self.buffer); + self.pos = 0; + } + + /// Pad message with a given padding `P` + /// + /// Returns `PadError` if internall buffer is full, which can only happen if + /// `input_lazy` was used. + #[inline] + pub fn pad_with<P: Padding>(&mut self) + -> Result<&mut GenericArray<u8, BlockSize>, PadError> + { + P::pad_block(&mut self.buffer[..], self.pos)?; + self.pos = 0; + Ok(&mut self.buffer) + } + + /// Return size of the internall buffer in bytes + #[inline] + pub fn size(&self) -> usize { + BlockSize::to_usize() + } + + /// Return current cursor position + #[inline] + pub fn position(&self) -> usize { + self.pos + } + + /// Return number of remaining bytes in the internall buffer + #[inline] + pub fn remaining(&self) -> usize { + self.size() - self.pos + } + + /// Reset buffer by setting cursor position to zero + #[inline] + pub fn reset(&mut self) { + self.pos = 0 + } +} |