1 files changed, 115 insertions, 0 deletions
diff --git a/third_party/rust/sha-1/src/lib.rs b/third_party/rust/sha-1/src/lib.rs
new file mode 100644
index 0000000000..a1a7068a06
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+++ b/third_party/rust/sha-1/src/lib.rs
@@ -0,0 +1,115 @@
+//! An implementation of the [SHA-1][1] cryptographic hash algorithm.
+//!
+//! # Usage
+//!
+//! ```rust
+//! # #[macro_use] extern crate hex_literal;
+//! # extern crate sha1;
+//! # fn main() {
+//! use sha1::{Sha1, Digest};
+//!
+//! // create a Sha1 object
+//! let mut hasher = Sha1::new();
+//!
+//! // process input message
+//! hasher.input(b"hello world");
+//!
+//! // acquire hash digest in the form of GenericArray,
+//! // which in this case is equivalent to [u8; 20]
+//! let result = hasher.result();
+//! assert_eq!(result[..], hex!("2aae6c35c94fcfb415dbe95f408b9ce91ee846ed"));
+//! # }
+//! ```
+//!
+//! Also see [RustCrypto/hashes][2] readme.
+//!
+//! [1]: https://en.wikipedia.org/wiki/SHA-1
+//! [2]: https://github.com/RustCrypto/hashes
+#![no_std]
+#![doc(html_logo_url =
+    "https://raw.githubusercontent.com/RustCrypto/meta/master/logo_small.png")]
+extern crate block_buffer;
+#[macro_use] extern crate opaque_debug;
+#[macro_use] pub extern crate digest;
+#[cfg(feature = "std")]
+extern crate std;
+#[cfg(not(feature = "asm"))]
+extern crate fake_simd as simd;
+
+#[cfg(feature = "asm")]
+extern crate sha1_asm;
+#[cfg(feature = "asm")]
+#[inline(always)]
+fn compress(state: &mut [u32; 5], block: &GenericArray<u8, U64>) {
+    let block: &[u8; 64] = unsafe { core::mem::transmute(block) };
+    sha1_asm::compress(state, block);
+}
+
+#[cfg(not(feature = "asm"))]
+mod utils;
+#[cfg(not(feature = "asm"))]
+use utils::compress;
+
+pub use digest::Digest;
+use digest::{Input, BlockInput, FixedOutput, Reset};
+use digest::generic_array::GenericArray;
+use digest::generic_array::typenum::{U20, U64};
+use block_buffer::BlockBuffer;
+use block_buffer::byteorder::{BE, ByteOrder};
+
+mod consts;
+use consts::{STATE_LEN, H};
+
+/// Structure representing the state of a SHA-1 computation
+#[derive(Clone)]
+pub struct Sha1 {
+    h: [u32; STATE_LEN],
+    len: u64,
+    buffer: BlockBuffer<U64>,
+}
+
+impl Default for Sha1 {
+    fn default() -> Self {
+        Sha1{ h: H, len: 0u64, buffer: Default::default() }
+    }
+}
+
+impl BlockInput for Sha1 {
+    type BlockSize = U64;
+}
+
+impl Input for Sha1 {
+    fn input<B: AsRef<[u8]>>(&mut self, input: B) {
+        let input = input.as_ref();
+        // Assumes that `length_bits<<3` will not overflow
+        self.len += input.len() as u64;
+        let state = &mut self.h;
+        self.buffer.input(input, |d| compress(state, d));
+    }
+}
+
+impl FixedOutput for Sha1 {
+    type OutputSize = U20;
+
+    fn fixed_result(mut self) -> GenericArray<u8, Self::OutputSize> {
+        {
+            let state = &mut self.h;
+            let l = self.len << 3;
+            self.buffer.len64_padding::<BE, _>(l, |d| compress(state, d));
+        }
+        let mut out = GenericArray::default();
+        BE::write_u32_into(&self.h,&mut out);
+        out
+    }
+}
+
+impl Reset for Sha1 {
+    fn reset(&mut self) {
+        self.h = H;
+        self.len = 0;
+        self.buffer.reset();
+    }
+}
+
+impl_opaque_debug!(Sha1);
+impl_write!(Sha1);