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class Digest::SHA2 - Documentation for Ruby 3.5

1. Digest::
2. SHA2

A meta digest provider class for SHA256, SHA384 and SHA512.

FIPS 180-2 describes SHA2 family of digest algorithms. It defines three algorithms:

• one which works on chunks of 512 bits and returns a 256-bit digest (SHA256),

• one which works on chunks of 1024 bits and returns a 384-bit digest (SHA384),

• and one which works on chunks of 1024 bits and returns a 512-bit digest (SHA512).

require 'digest'


Digest::SHA2.hexdigest 'abc'          
Digest::SHA2.new(256).hexdigest 'abc' 
Digest::SHA256.hexdigest 'abc'        

Digest::SHA2.new(384).hexdigest 'abc' 
Digest::SHA384.hexdigest 'abc'        

Digest::SHA2.new(512).hexdigest 'abc' 
Digest::SHA512.hexdigest 'abc'        


sha2 = Digest::SHA2.new               
sha2.update "ab"
sha2 << "c"                           
sha2.hexdigest                        


sha2.reset
sha2 << "message"
sha2.hexdigest                        

def initialize(bitlen = 256)
  case bitlen
  when 256
    @sha2 = Digest::SHA256.new
  when 384
    @sha2 = Digest::SHA384.new
  when 512
    @sha2 = Digest::SHA512.new
  else
    raise ArgumentError, "unsupported bit length: %s" % bitlen.inspect
  end
  @bitlen = bitlen
end

Create a new SHA2 hash object with a given bit length.

Valid bit lengths are 256, 384 and 512.

def block_length
  @sha2.block_length
end

Return the block length of the digest in bytes.

Digest::SHA256.new.block_length * 8

Digest::SHA384.new.block_length * 8

Digest::SHA512.new.block_length * 8

def digest_length
  @sha2.digest_length
end

Return the length of the hash value (the digest) in bytes.

Digest::SHA256.new.digest_length * 8

Digest::SHA384.new.digest_length * 8

Digest::SHA512.new.digest_length * 8

For example, digests produced by Digest::SHA256 will always be 32 bytes (256 bits) in size.

def reset
  @sha2.reset
  self
end

Reset the digest to the initial state and return self.

def update(str)
  @sha2.update(str)
  self
end

Update the digest using a given string and return self.

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