diff options
Diffstat (limited to 'ext/digest/sha2/lib/sha2.rb')
-rw-r--r-- | ext/digest/sha2/lib/sha2.rb | 44 |
1 files changed, 39 insertions, 5 deletions
diff --git a/ext/digest/sha2/lib/sha2.rb b/ext/digest/sha2/lib/sha2.rb index 58ff9f5cf0..e5a44ff0d4 100644 --- a/ext/digest/sha2/lib/sha2.rb +++ b/ext/digest/sha2/lib/sha2.rb @@ -17,11 +17,45 @@ module Digest # # 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). + # + # ==Examples + # require 'digest' + # + # # Compute a complete digest + # Digest::SHA2.hexdigest 'abc' # => "ba7816bf8..." + # Digest::SHA2.new(256).hexdigest 'abc' # => "ba7816bf8..." + # Digest::SHA256.hexdigest 'abc' # => "ba7816bf8..." + # + # Digest::SHA2.new(384).hexdigest 'abc' # => "cb00753f4..." + # Digest::SHA384.hexdigest 'abc' # => "cb00753f4..." + # + # Digest::SHA2.new(512).hexdigest 'abc' # => "ddaf35a19..." + # Digest::SHA512.hexdigest 'abc' # => "ddaf35a19..." + # + # # Compute digest by chunks + # sha2 = Digest::SHA2.new # =>#<Digest::SHA2:256> + # sha2.update "ab" + # sha2 << "c" # alias for #update + # sha2.hexdigest # => "ba7816bf8..." + # + # # Use the same object to compute another digest + # sha2.reset + # sha2 << "message" + # sha2.hexdigest # => "ab530a13e..." + # class SHA2 < Digest::Class # call-seq: # Digest::SHA2.new(bitlen = 256) -> digest_obj # - # Creates a new SHA2 hash object with a given bit length. + # Create a new SHA2 hash object with a given bit length. # # Valid bit lengths are 256, 384 and 512. def initialize(bitlen = 256) @@ -41,7 +75,7 @@ module Digest # call-seq: # digest_obj.reset -> digest_obj # - # Resets the digest to the initial state and returns self. + # Reset the digest to the initial state and return self. def reset @sha2.reset self @@ -51,7 +85,7 @@ module Digest # digest_obj.update(string) -> digest_obj # digest_obj << string -> digest_obj # - # Updates the digest using a given _string_ and returns self. + # Update the digest using a given _string_ and return self. def update(str) @sha2.update(str) self @@ -67,7 +101,7 @@ module Digest # call-seq: # digest_obj.block_length -> Integer # - # Returns the block length of the digest in bytes. + # Return the block length of the digest in bytes. # # Digest::SHA256.new.block_length * 8 # # => 512 @@ -82,7 +116,7 @@ module Digest # call-seq: # digest_obj.digest_length -> Integer # - # Returns the length of the hash value of the digest in bytes. + # Return the length of the hash value (the digest) in bytes. # # Digest::SHA256.new.digest_length * 8 # # => 256 |