In Files
- digest/sha2/lib/sha2.rb
Parent
Methods
Class/Module Index
Digest::SHA2
A meta digest provider class for SHA256, SHA384 and SHA512.
Public Class Methods
Digest::SHA2.new(bitlen = 256) → digest_obj
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 27 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
block_length → Integer
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 78 def block_length @sha2.block_length end
digest_length → Integer
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 96 def digest_length @sha2.digest_length end
reset → digest_obj
Resets the digest to the initial state and returns self.
# File digest/sha2/lib/sha2.rb, line 45 def reset @sha2.reset self end
update(string) → digest_obj
digest_obj << string → digest_obj
Updates the digest using a given string and returns self.
# File digest/sha2/lib/sha2.rb, line 55 def update(str) @sha2.update(str) self end
Also aliased as: <<