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Contents
require 'digest/sha1'
module ASIR
class Coder
# !SLIDE
# Sign Coder
#
# Sign payload during encode, check signature during decode.
#
# Signature is the digest of secret + payload.
#
# Encode payload as Hash containing the digest function name, signature and payload.
# Decode and validate Hash containing the digest function name, signature and payload.
#
class Sign < self
attr_accessor :secret, :function
def _encode obj
payload = obj.to_s
{ :function => function,
:signature => ::Digest.const_get(function).
new.hexdigest(secret + payload),
:payload => payload }
end
def _decode obj
raise SignatureError, "expected Hash, given #{obj.class}" unless Hash === obj
payload = obj[:payload]
raise SignatureError, "signature invalid" unless obj == _encode(payload)
payload
end
# !SLIDE
# Sign Coder Support
# Signature Error.
class SignatureError < Error; end
def initialize_before_opts
@function = :SHA1
end
# !SLIDE END
end
# !SLIDE END
end # class
end # class
Version data entries
31 entries across 31 versions & 1 rubygems