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A meta digest provider class for SHA256, SHA384 and SHA512.
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
Returns the block length of the digest in bytes.
Digest::SHA256.new.block_length * 8 # => 512 Digest::SHA384.new.block_length * 8 # => 1024 Digest::SHA512.new.block_length * 8 # => 1024
# File digest/sha2/lib/sha2.rb, line 77 def block_length @sha2.block_length end
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
Resets the digest to the initial state and returns self.
# File digest/sha2/lib/sha2.rb, line 44 def reset @sha2.reset self end
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