sha3

Gem Version Ruby

SHA3 for Ruby is a XKCP based native (C) binding to SHA3 (FIPS 202) cryptographic hashing algorithm.

Warning

  • Please do NOT use SHA3 to hash passwords – use a slow hashing function instead (e.g.: pbkdf2, argon2, bcrypt or scrypt)
  • Version 1.0 introduces new API and is incompatible with previous versions (0.x).

Module details

SHA3::Digest: A standard Digest subclass. The interface, and operation of this class are parallel to digest classes bundled with MRI-based Rubies (e.g.: Digest::SHA2, and OpenSSL::Digest).

See documentation for Ruby’s Digest class for additional details.

Installation

shell gem install sha3

Usage

ruby require 'sha3'

Valid hash bit-lengths are: 224, 256, 384, 512.

```ruby :sha224 :sha256 :sha384 :sha512

SHA3::Digest.new(224) is SHA3::Digest.new(:sha224)

```

Alternatively, you can instantiate using one of four sub-classes:

ruby SHA3::Digest::SHA224.new() # 224 bits SHA3::Digest::SHA256.new() # 256 bits SHA3::Digest::SHA384.new() # 384 bits SHA3::Digest::SHA512.new() # 512 bits

Basics

```ruby # Instantiate a new SHA3::Digest class with 256 bit length s = SHA3::Digest.new(:sha256)

OR

s = SHA3::Digest::SHA256.new()

Update hash state, and compute new value

s.update “Compute Me”

« is an .update() alias

s « “Me too”

Returns digest value in bytes

s.digest # => “\xBE\xDF\r\xD9\xA1…”

Returns digest value as hex string

s.hexdigest # => “bedf0dd9a15b647…”

Digest class-methods:

SHA3::Digest.hexdigest(:sha224, “Hash me, please”) # => “200e7bc18cd613…”

SHA3::Digest::SHA384.digest(“Hash me, please”) # => “\xF5\xCEpC\xB0eV…” ```

Hashing a file

```ruby # Compute the hash value for given file, and return the result as hex s = SHA3::Digest::SHA224.file(“my_fantastical_file.bin”).hexdigest

Calling SHA3::Digest.file(…) defaults to SHA256

s = SHA3::Digest.file(“tests.sh”) # => #<SHA3::Digest: a9801db49389339…> ```

Development Dependencies

  • Native build tools (e.g., Clang/LLVM, GCC, Minigw, etc.)
  • Gems: rubygems-tasks, rake, rspec, yard

Testing

Call rake to run the included RSpec tests.

Only a small subset of test vectors are included in the source repository; however, the complete test vectors suite is available for download. Simply run the tests.sh shell script (available in the root of source directory) to generate full byte-length RSpec test files.

sh tests.sh

Rubies

Supported Ruby versions:

  • MRI Ruby 2.6 - 3.1

Credits

XKCP by Keccak team: https://keccak.team/index.html

Copyright (c) 2012 - 2022 Johanns Gregorian (https://github.com/johanns)

See LICENSE.txt for details.