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Diffstat (limited to 'vendor/block-buffer-0.9.0')
| -rw-r--r-- | vendor/block-buffer-0.9.0/.cargo-checksum.json | 1 | ||||
| -rw-r--r-- | vendor/block-buffer-0.9.0/Cargo.toml | 29 | ||||
| -rw-r--r-- | vendor/block-buffer-0.9.0/LICENSE-APACHE | 201 | ||||
| -rw-r--r-- | vendor/block-buffer-0.9.0/LICENSE-MIT | 25 | ||||
| -rw-r--r-- | vendor/block-buffer-0.9.0/src/lib.rs | 233 |
5 files changed, 489 insertions, 0 deletions
diff --git a/vendor/block-buffer-0.9.0/.cargo-checksum.json b/vendor/block-buffer-0.9.0/.cargo-checksum.json new file mode 100644 index 00000000..ad6294a0 --- /dev/null +++ b/vendor/block-buffer-0.9.0/.cargo-checksum.json @@ -0,0 +1 @@ +{"files":{"Cargo.toml":"34462967bea652daffb9de37578231a0c8318b5b9ed0f7682c8ab5d00820cb82","LICENSE-APACHE":"a9040321c3712d8fd0b09cf52b17445de04a23a10165049ae187cd39e5c86be5","LICENSE-MIT":"d5c22aa3118d240e877ad41c5d9fa232f9c77d757d4aac0c2f943afc0a95e0ef","src/lib.rs":"39a549b74d83a11887e1f257d3273d7c1b82052b671e6e5ac1938f87a9ee4717"},"package":"4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"}
\ No newline at end of file diff --git a/vendor/block-buffer-0.9.0/Cargo.toml b/vendor/block-buffer-0.9.0/Cargo.toml new file mode 100644 index 00000000..99c0f39a --- /dev/null +++ b/vendor/block-buffer-0.9.0/Cargo.toml @@ -0,0 +1,29 @@ +# 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] +edition = "2018" +name = "block-buffer" +version = "0.9.0" +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 = "0.2.0" +optional = true + +[dependencies.generic-array] +version = "0.14" diff --git a/vendor/block-buffer-0.9.0/LICENSE-APACHE b/vendor/block-buffer-0.9.0/LICENSE-APACHE new file mode 100644 index 00000000..78173fa2 --- /dev/null +++ b/vendor/block-buffer-0.9.0/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/vendor/block-buffer-0.9.0/src/lib.rs b/vendor/block-buffer-0.9.0/src/lib.rs new file mode 100644 index 00000000..49b8b3dc --- /dev/null +++ b/vendor/block-buffer-0.9.0/src/lib.rs @@ -0,0 +1,233 @@ +#![no_std] +pub use generic_array; +#[cfg(feature = "block-padding")] +pub use block_padding; + +use core::{slice, convert::TryInto}; +use generic_array::{GenericArray, ArrayLength}; +#[cfg(feature = "block-padding")] +use block_padding::{Padding, PadError}; + +/// Buffer for block processing of data +#[derive(Clone, Default)] +pub struct BlockBuffer<BlockSize: ArrayLength<u8>> { + buffer: GenericArray<u8, BlockSize>, + pos: usize, +} + +impl<BlockSize: ArrayLength<u8>> BlockBuffer<BlockSize> { + /// Process data in `input` in blocks of size `BlockSize` using function `f`. + #[inline] + pub fn input_block( + &mut self, mut input: &[u8], mut f: impl FnMut(&GenericArray<u8, BlockSize>), + ) { + let r = self.remaining(); + if input.len() < r { + let n = input.len(); + self.buffer[self.pos..self.pos + n].copy_from_slice(input); + self.pos += n; + return; + } + if self.pos != 0 && input.len() >= r { + let (l, r) = input.split_at(r); + input = r; + self.buffer[self.pos..].copy_from_slice(l); + f(&self.buffer); + } + + let mut chunks_iter = input.chunks_exact(self.size()); + for chunk in &mut chunks_iter { + f(chunk.try_into().unwrap()); + } + let rem = chunks_iter.remainder(); + + // Copy any remaining data into the buffer. + self.buffer[..rem.len()].copy_from_slice(rem); + self.pos = rem.len(); + } + + /// Process data in `input` in blocks of size `BlockSize` using function `f`, which accepts + /// slice of blocks. + #[inline] + pub fn input_blocks( + &mut self, mut input: &[u8], mut f: impl FnMut(&[GenericArray<u8, BlockSize>]), + ) { + let r = self.remaining(); + if input.len() < r { + let n = input.len(); + self.buffer[self.pos..self.pos + n].copy_from_slice(input); + self.pos += n; + return; + } + if self.pos != 0 && input.len() >= r { + let (l, r) = input.split_at(r); + 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 its data without copying into the buffer + let n_blocks = input.len()/self.size(); + let (left, right) = input.split_at(n_blocks*self.size()); + // SAFETY: 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. + let n = right.len(); + self.buffer[..n].copy_from_slice(right); + self.pos = n; + } + + /// 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( + &mut self, mut input: &[u8], mut f: impl FnMut(&GenericArray<u8, BlockSize>), + ) { + let r = self.remaining(); + if input.len() <= r { + let n = input.len(); + self.buffer[self.pos..self.pos + n].copy_from_slice(input); + self.pos += n; + return; + } + if self.pos != 0 && input.len() > r { + let (l, r) = input.split_at(r); + input = r; + self.buffer[self.pos..].copy_from_slice(l); + f(&self.buffer); + } + + while input.len() > self.size() { + let (block, r) = input.split_at(self.size()); + input = r; + f(block.try_into().unwrap()); + } + + self.buffer[..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( + &mut self, up_to: usize, mut f: impl FnMut(&GenericArray<u8, BlockSize>), + ) { + if self.pos == self.size() { + f(&self.buffer); + self.pos = 0; + } + self.buffer[self.pos] = 0x80; + self.pos += 1; + + set_zero(&mut self.buffer[self.pos..]); + + if self.remaining() < up_to { + f(&self.buffer); + set_zero(&mut self.buffer[..self.pos]); + } + } + + /// Pad message with 0x80, zeros and 64-bit message length + /// using big-endian byte order + #[inline] + pub fn len64_padding_be( + &mut self, data_len: u64, mut f: impl FnMut(&GenericArray<u8, BlockSize>), + ) { + self.digest_pad(8, &mut f); + let b = data_len.to_be_bytes(); + let n = self.buffer.len() - b.len(); + self.buffer[n..].copy_from_slice(&b); + f(&self.buffer); + self.pos = 0; + } + + /// Pad message with 0x80, zeros and 64-bit message length + /// using little-endian byte order + #[inline] + pub fn len64_padding_le( + &mut self, data_len: u64, mut f: impl FnMut(&GenericArray<u8, BlockSize>), + ) { + self.digest_pad(8, &mut f); + let b = data_len.to_le_bytes(); + let n = self.buffer.len() - b.len(); + self.buffer[n..].copy_from_slice(&b); + f(&self.buffer); + self.pos = 0; + } + + /// Pad message with 0x80, zeros and 128-bit message length + /// using big-endian byte order + #[inline] + pub fn len128_padding_be( + &mut self, data_len: u128, mut f: impl FnMut(&GenericArray<u8, BlockSize>), + ) { + self.digest_pad(16, &mut f); + let b = data_len.to_be_bytes(); + let n = self.buffer.len() - b.len(); + self.buffer[n..].copy_from_slice(&b); + 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. + #[cfg(feature = "block-padding")] + #[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 + } +} + +/// Sets all bytes in `dst` to zero +#[inline(always)] +fn set_zero(dst: &mut [u8]) { + // SAFETY: we overwrite valid memory behind `dst` + // note: loop is not used here because it produces + // unnecessary branch which tests for zero-length slices + unsafe { + core::ptr::write_bytes(dst.as_mut_ptr(), 0, dst.len()); + } +} |