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diff --git a/third_party/rust/sha2/src/lib.rs b/third_party/rust/sha2/src/lib.rs
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+//! An implementation of the [SHA-2][1] cryptographic hash algorithms.
+//!
+//! There are 6 standard algorithms specified in the SHA-2 standard: [`Sha224`],
+//! [`Sha256`], [`Sha512_224`], [`Sha512_256`], [`Sha384`], and [`Sha512`].
+//!
+//! Algorithmically, there are only 2 core algorithms: SHA-256 and SHA-512.
+//! All other algorithms are just applications of these with different initial
+//! hash values, and truncated to different digest bit lengths. The first two
+//! algorithms in the list are based on SHA-256, while the last three on SHA-512.
+//!
+//! # Usage
+//!
+//! ```rust
+//! use hex_literal::hex;
+//! use sha2::{Sha256, Sha512, Digest};
+//!
+//! // create a Sha256 object
+//! let mut hasher = Sha256::new();
+//!
+//! // write input message
+//! hasher.update(b"hello world");
+//!
+//! // read hash digest and consume hasher
+//! let result = hasher.finalize();
+//!
+//! assert_eq!(result[..], hex!("
+//!     b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9
+//! ")[..]);
+//!
+//! // same for Sha512
+//! let mut hasher = Sha512::new();
+//! hasher.update(b"hello world");
+//! let result = hasher.finalize();
+//!
+//! assert_eq!(result[..], hex!("
+//!     309ecc489c12d6eb4cc40f50c902f2b4d0ed77ee511a7c7a9bcd3ca86d4cd86f
+//!     989dd35bc5ff499670da34255b45b0cfd830e81f605dcf7dc5542e93ae9cd76f
+//! ")[..]);
+//! ```
+//!
+//! Also see [RustCrypto/hashes][2] readme.
+//!
+//! [1]: https://en.wikipedia.org/wiki/SHA-2
+//! [2]: https://github.com/RustCrypto/hashes
+
+#![no_std]
+#![cfg_attr(docsrs, feature(doc_cfg))]
+#![doc(
+    html_logo_url = "https://raw.githubusercontent.com/RustCrypto/media/6ee8e381/logo.svg",
+    html_favicon_url = "https://raw.githubusercontent.com/RustCrypto/media/6ee8e381/logo.svg"
+)]
+#![warn(missing_docs, rust_2018_idioms)]
+
+pub use digest::{self, Digest};
+
+#[cfg(feature = "oid")]
+use digest::const_oid::{AssociatedOid, ObjectIdentifier};
+use digest::{
+    consts::{U28, U32, U48, U64},
+    core_api::{CoreWrapper, CtVariableCoreWrapper},
+    impl_oid_carrier,
+};
+
+#[rustfmt::skip]
+mod consts;
+mod core_api;
+mod sha256;
+mod sha512;
+
+#[cfg(feature = "compress")]
+pub use sha256::compress256;
+#[cfg(feature = "compress")]
+pub use sha512::compress512;
+
+pub use core_api::{Sha256VarCore, Sha512VarCore};
+
+impl_oid_carrier!(OidSha256, "2.16.840.1.101.3.4.2.1");
+impl_oid_carrier!(OidSha384, "2.16.840.1.101.3.4.2.2");
+impl_oid_carrier!(OidSha512, "2.16.840.1.101.3.4.2.3");
+impl_oid_carrier!(OidSha224, "2.16.840.1.101.3.4.2.4");
+impl_oid_carrier!(OidSha512_224, "2.16.840.1.101.3.4.2.5");
+impl_oid_carrier!(OidSha512_256, "2.16.840.1.101.3.4.2.6");
+
+/// SHA-224 hasher.
+pub type Sha224 = CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, U28, OidSha224>>;
+/// SHA-256 hasher.
+pub type Sha256 = CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, U32, OidSha256>>;
+/// SHA-512/224 hasher.
+pub type Sha512_224 = CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, U28, OidSha512_224>>;
+/// SHA-512/256 hasher.
+pub type Sha512_256 = CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, U32, OidSha512_256>>;
+/// SHA-384 hasher.
+pub type Sha384 = CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, U48, OidSha384>>;
+/// SHA-512 hasher.
+pub type Sha512 = CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, U64, OidSha512>>;