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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
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
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
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
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