Crate digest

This crate provides traits which describe functionality of cryptographic hash functions and Message Authentication algorithms.

Traits in this repository are organized into the following levels:

• High-level convenience traits: Digest, DynDigest, Mac. Wrappers around lower-level traits for most common use-cases. Users should usually prefer using these traits.
• Mid-level traits: Update, FixedOutput, FixedOutputReset, ExtendableOutput, ExtendableOutputReset, XofReader, VariableOutput, Reset, KeyInit, and InnerInit. These traits atomically describe available functionality of an algorithm.
• Marker traits: HashMarker, MacMarker. Used to distinguish different algorithm classes.
• Low-level traits defined in the core_api module. These traits operate at a block-level and do not contain any built-in buffering. They are intended to be implemented by low-level algorithm providers only. Usually they should not be used in application-level code.

Additionally hash functions implement traits from the standard library: Default, Clone, Write. The latter is feature-gated behind std feature, which is usually enabled by default by hash implementation crates.

Re-exports

• pub use block_buffer;
• pub use crypto_common;
• pub use crypto_common::generic_array;
• pub use crypto_common::typenum;

Modules

• consts
  Type aliases for many constants.
• core_api
  Low-level traits operating on blocks and wrappers around them.

Macros

• impl_oid_carrier
  Implement dummy type with hidden docs which is used to “carry” hasher OID for CtVariableCoreWrapper.

Structs

• CtOutput
  Fixed size output value which provides a safe Eq implementation that runs in constant time.
• InvalidBufferSize
  Buffer length is not equal to hash output size.
• InvalidLength
  The error type returned when key and/or IV used in the KeyInit, KeyIvInit, and InnerIvInit slice-based methods had an invalid length.
• InvalidOutputSize
  The error type used in variable hash traits.
• MacError
  Error type for when the Output of a Mac is not equal to the expected value.

Traits

• Digest
  Convenience wrapper trait covering functionality of cryptographic hash functions with fixed output size.
• DynDigest
  Modification of the Digest trait suitable for trait objects.
• ExtendableOutput
  Trait for hash functions with extendable-output (XOF).
• ExtendableOutputReset
  Trait for hash functions with extendable-output (XOF) able to reset themselves.
• FixedOutput
  Trait for hash functions with fixed-size output.
• FixedOutputReset
  Trait for hash functions with fixed-size output able to reset themselves.
• HashMarker
  Marker trait for cryptographic hash functions.
• InnerInit
  Types which can be initialized from another type (usually block ciphers).
• KeyInit
  Types which can be initialized from key.
• Mac
  Convenience wrapper trait covering functionality of Message Authentication algorithms.
• MacMarker
  Marker trait for Message Authentication algorithms.
• OutputSizeUser
  Types which return data with the given size.
• Reset
  Resettable types.
• Update
  Types which consume data with byte granularity.
• VariableOutput
  Trait for hash functions with variable-size output.
• VariableOutputReset
  Trait for hash functions with variable-size output able to reset themselves.
• XofReader
  Trait for reader types which are used to extract extendable output from a XOF (extendable-output function) result.

Type Definitions

• Key
  Key used by KeySizeUser implementors.
• Output
  Output array of OutputSizeUser implementors.