This Ruby extension implements the SHA-3 (Keccak) cryptographic hashing algorithm. It is based on the reference C implementation, version 3.2. The exposed interface is almost identical to that of the digest standard library.
gem install digest-sha3
Note: as of version 1.1.0, digest-sha3 requires Ruby 2.2. The last version that worked on older versions was 1.0.2.
Keccak supports 5 hash lengths: 224-bit, 256-bit, 384-bit, 512-bit and variable length. Variable length is not supported by this Ruby extension. Unless the user specifies otherwise, this Ruby extension assumes 512-bit.
require 'digest/sha3'
# Generate 512-bit digest.
Digest::SHA3.digest("foo") # => "\025\227\204*..."
Digest::SHA3.hexdigest("foo") # => "1597842a..."
# Generate 224-bit digest.
Digest::SHA3.digest("foo", 224) # => "\332\251M\247..."
Digest::SHA3.hexdigest("foo", 224) # => "daa94da7..."
# Use this interface to feed data in chunks. 512-bit by default.
digest = Digest::SHA3.new
digest.update("f")
digest.update("o")
digest.update("o")
digest.digest # => "\025\227\204*..."
digest.hexdigest # => "1597842a..."
# You can pass a hash length to the constructor.
digest = Digest::SHA3.new(224)
Run the test suite as follows:
make test
A part of the test suite is automatically generated from Keccak's reference test suite.
Do not use SHA-3 for hashing passwords. Do not even use SHA-3 + salt for hashing passowords. Use a slow hash instead.