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  • digest/sha2/lib/sha2.rb

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Digest::SHA2

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

Public Class Methods

Digest::SHA2.new(bitlen = 256) → digest_obj click to toggle source

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

Valid bit lengths are 256, 384 and 512.

 
               # File digest/sha2/lib/sha2.rb, line 26
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
            

Public Instance Methods

<<(str) click to toggle source
Alias for: update
block_length → Integer click to toggle source

Returns the block length of the digest in bytes.

Digest::SHA256.new.digest_length * 8
# => 512
Digest::SHA384.new.digest_length * 8
# => 1024
Digest::SHA512.new.digest_length * 8
# => 1024
 
               # File digest/sha2/lib/sha2.rb, line 77
def block_length
  @sha2.block_length
end
            
digest_length → Integer click to toggle source

Returns the length of the hash value of the digest in bytes.

Digest::SHA256.new.digest_length * 8
# => 256
Digest::SHA384.new.digest_length * 8
# => 384
Digest::SHA512.new.digest_length * 8
# => 512

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

 
               # File digest/sha2/lib/sha2.rb, line 95
def digest_length
  @sha2.digest_length
end
            
reset → digest_obj click to toggle source

Resets the digest to the initial state and returns self.

 
               # File digest/sha2/lib/sha2.rb, line 44
def reset
  @sha2.reset
  self
end
            
update(string) → digest_obj click to toggle source
digest_obj << string → digest_obj

Updates the digest using a given string and returns self.

 
               # File digest/sha2/lib/sha2.rb, line 54
def update(str)
  @sha2.update(str)
  self
end
            
Also aliased as: <<