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# = digest/hmac.rb
#
# An implementation of HMAC keyed-hashing algorithm
#
# == Overview
#
# This library adds a method named hmac() to Digest classes, which
# creates a Digest class for calculating HMAC digests.
#
# == Examples
#
# require 'digest/hmac'
#
# # one-liner example
# puts Digest::HMAC.hexdigest("data", "hash key", Digest::SHA1)
#
# # rather longer one
# hmac = Digest::HMAC.new("foo", Digest::RMD160)
#
# buf = ""
# while stream.read(16384, buf)
# hmac.update(buf)
# end
#
# puts hmac.bubblebabble
#
# == License
#
# Copyright (c) 2006 Akinori MUSHA <knu@iDaemons.org>
#
# Documentation by Akinori MUSHA
#
# All rights reserved. You can redistribute and/or modify it under
# the same terms as Ruby.
#
# $Id$
#
require 'digest'
module Digest
class HMAC < Digest::Class
def initialize(key, digester)
@md = digester.new
block_len = @md.block_length
if key.length > block_len
key = @md.digest(key)
end
ipad = Array.new(block_len).fill(0x36)
opad = Array.new(block_len).fill(0x5c)
key.bytes.each_with_index { |c, i|
ipad[i] ^= c
opad[i] ^= c
}
@key = key.freeze
@ipad = ipad.inject('') { |s, c| s << c.chr }.freeze
@opad = opad.inject('') { |s, c| s << c.chr }.freeze
end
def initialize_copy(other)
@md = other.instance_eval { @md.clone }
end
def update(text)
@md.reset.update(@opad + @md.digest(@ipad + text))
self
end
def reset
@md.reset
self
end
def finish
@md.digest!
end
private :finish
def digest_length
@md.digest_length
end
def block_length
@md.block_length
end
def inspect
sprintf('#<%s: key=%s, digest=%s>', self.class.name, @key.inspect, @md.inspect.sub(/^\#<(.*)>$/) { $1 });
end
end
end
if $0 == __FILE__
eval DATA.read, nil, $0, __LINE__+4
end
__END__
require 'test/unit'
module TM_HMAC
def test_s_hexdigest
cases.each { |h|
digesters.each { |d|
assert_equal(h[:hexdigest], Digest::HMAC.hexdigest(h[:data], h[:key], d))
}
}
end
def test_hexdigest
cases.each { |h|
digesters.each { |d|
hmac = Digest::HMAC.new(h[:key], d)
hmac.update(h[:data])
assert_equal(h[:hexdigest], hmac.hexdigest)
}
}
end
def test_reset
cases.each { |h|
digesters.each { |d|
hmac = Digest::HMAC.new(h[:key], d)
hmac.update("test")
hmac.reset
hmac.update(h[:data])
assert_equal(h[:hexdigest], hmac.hexdigest)
}
}
end
end
class TC_HMAC_MD5 < Test::Unit::TestCase
include TM_HMAC
def digesters
[Digest::MD5, Digest::MD5.new]
end
# Taken from RFC 2202: Test Cases for HMAC-MD5 and HMAC-SHA-1
def cases
[
{
:key => "\x0b" * 16,
:data => "Hi There",
:hexdigest => "9294727a3638bb1c13f48ef8158bfc9d",
}, {
:key => "Jefe",
:data => "what do ya want for nothing?",
:hexdigest => "750c783e6ab0b503eaa86e310a5db738",
}, {
:key => "\xaa" * 16,
:data => "\xdd" * 50,
:hexdigest => "56be34521d144c88dbb8c733f0e8b3f6",
}, {
:key => "\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19",
:data => "\xcd" * 50,
:hexdigest => "697eaf0aca3a3aea3a75164746ffaa79",
}, {
:key => "\x0c" * 16,
:data => "Test With Truncation",
:hexdigest => "56461ef2342edc00f9bab995690efd4c",
}, {
:key => "\xaa" * 80,
:data => "Test Using Larger Than Block-Size Key - Hash Key First",
:hexdigest => "6b1ab7fe4bd7bf8f0b62e6ce61b9d0cd",
}, {
:key => "\xaa" * 80,
:data => "Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data",
:hexdigest => "6f630fad67cda0ee1fb1f562db3aa53e",
}
]
end
end
class TC_HMAC_SHA1 < Test::Unit::TestCase
include TM_HMAC
def digesters
[Digest::SHA1, Digest::SHA1.new]
end
# Taken from RFC 2202: Test Cases for HMAC-MD5 and HMAC-SHA-1
def cases
[
{
:key => "\x0b" * 20,
:data => "Hi There",
:hexdigest => "b617318655057264e28bc0b6fb378c8ef146be00",
}, {
:key => "Jefe",
:data => "what do ya want for nothing?",
:hexdigest => "effcdf6ae5eb2fa2d27416d5f184df9c259a7c79",
}, {
:key => "\xaa" * 20,
:data => "\xdd" * 50,
:hexdigest => "125d7342b9ac11cd91a39af48aa17b4f63f175d3",
}, {
:key => "\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19",
:data => "\xcd" * 50,
:hexdigest => "4c9007f4026250c6bc8414f9bf50c86c2d7235da",
}, {
:key => "\x0c" * 20,
:data => "Test With Truncation",
:hexdigest => "4c1a03424b55e07fe7f27be1d58bb9324a9a5a04",
}, {
:key => "\xaa" * 80,
:data => "Test Using Larger Than Block-Size Key - Hash Key First",
:hexdigest => "aa4ae5e15272d00e95705637ce8a3b55ed402112",
}, {
:key => "\xaa" * 80,
:data => "Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data",
:hexdigest => "e8e99d0f45237d786d6bbaa7965c7808bbff1a91",
}
]
end
end
class TC_HMAC_RMD160 < Test::Unit::TestCase
include TM_HMAC
def digesters
[Digest::RMD160, Digest::RMD160.new]
end
# Taken from RFC 2286: Test Cases for HMAC-RIPEMD160 and HMAC-RIPEMD128
def cases
[
{
:key => "\x0b" * 20,
:data => "Hi There",
:hexdigest => "24cb4bd67d20fc1a5d2ed7732dcc39377f0a5668",
}, {
:key => "Jefe",
:data => "what do ya want for nothing?",
:hexdigest => "dda6c0213a485a9e24f4742064a7f033b43c4069",
}, {
:key => "\xaa" * 20,
:data => "\xdd" * 50,
:hexdigest => "b0b105360de759960ab4f35298e116e295d8e7c1",
}, {
:key => "\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19",
:data => "\xcd" * 50,
:hexdigest => "d5ca862f4d21d5e610e18b4cf1beb97a4365ecf4",
}, {
:key => "\x0c" * 20,
:data => "Test With Truncation",
:hexdigest => "7619693978f91d90539ae786500ff3d8e0518e39",
}, {
:key => "\xaa" * 80,
:data => "Test Using Larger Than Block-Size Key - Hash Key First",
:hexdigest => "6466ca07ac5eac29e1bd523e5ada7605b791fd8b",
}, {
:key => "\xaa" * 80,
:data => "Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data",
:hexdigest => "69ea60798d71616cce5fd0871e23754cd75d5a0a",
}
]
end
end
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