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-rw-r--r--ext/digest/sha2/lib/sha2.rb49
1 files changed, 41 insertions, 8 deletions
diff --git a/ext/digest/sha2/lib/sha2.rb b/ext/digest/sha2/lib/sha2.rb
index b8e4609..3c5bf0c 100644
--- a/ext/digest/sha2/lib/sha2.rb
+++ b/ext/digest/sha2/lib/sha2.rb
@@ -18,9 +18,11 @@ module Digest
#
class SHA2 < Digest::Class
# call-seq:
- # Digest::SHA2.new(bitlen = 256) -> digest_obj
+ # 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.
def initialize(bitlen = 256)
case bitlen
when 256
@@ -35,39 +37,70 @@ module Digest
@bitlen = bitlen
end
- # :nodoc:
+ # call-seq:
+ # digest_obj.reset -> digest_obj
+ #
+ # Resets the digest to the initial state and returns self.
def reset
@sha2.reset
self
end
- # :nodoc:
+ # call-seq:
+ # digest_obj.update(string) -> digest_obj
+ # digest_obj << string -> digest_obj
+ #
+ # Updates the digest using a given _string_ and returns self.
def update(str)
@sha2.update(str)
self
end
alias << update
- def finish
+ def finish # :nodoc:
@sha2.digest!
end
private :finish
+
+ # call-seq:
+ # digest_obj.block_length -> Integer
+ #
+ # 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
def block_length
@sha2.block_length
end
+ # call-seq:
+ # digest_obj.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.
def digest_length
@sha2.digest_length
end
- # :nodoc:
- def initialize_copy(other)
+ def initialize_copy(other) # :nodoc:
@sha2 = other.instance_eval { @sha2.clone }
end
- # :nodoc:
- def inspect
+ def inspect # :nodoc:
"#<%s:%d %s>" % [self.class.name, @bitlen, hexdigest]
end
end