unimportant

sha2.lua

@@ -2,6 +2,12 @@
 local ffi = require'ffi'
 local C = ffi.load'sha2'
 
+if not ... then
+	require'sha2_test'
+	require'sha2_hmac_test'
+	return
+end
+
 ffi.cdef[[
 enum {
 	SHA256_BLOCK_LENGTH  = 64,
@@ -67,6 +73,17 @@ M.sha256 = hash_function(M.sha256_digest)
 M.sha384 = hash_function(M.sha384_digest)
 M.sha512 = hash_function(M.sha512_digest)
 
-if not ... then require'sha2_test' end
+local function mkhmac(SHA, keysize)
+	local HMAC = SHA..'_hmac'
+	local SHA = M[SHA]
+	M[HMAC] = function(message, key)
+		local hmac = require'hmac'
+		M[HMAC] = hmac.new(SHA, keysize)
+		return M[HMAC](message, key)
+	end
+end
+mkhmac('sha256',  64)
+mkhmac('sha384', 128)
+mkhmac('sha512', 128)
 
 return M

sha2.md

@@ -23,6 +23,9 @@ A ffi binding of Aaron Gifford's [SHA-2 implementation][sha2 lib].
 `digest(cdata, size)`            \
 `digest() -> s`
 
+`sha2.sha256_hmac(s, key) -> s`     compute the HMAC-SHA256 of a string.
+`sha2.sha384_hmac(s, key) -> s`     compute the HMAC-SHA384 of a string.
+`sha2.sha512_hmac(s, key) -> s`     compute the HMAC-SHA512 of a string.
 ----------------------------------- -----------------------------------
 
 [glue.tohex]: glue.html#tohex

sha2_hmac_test.lua

@@ -0,0 +1,76 @@
+local sha2 = require'sha2'
+local hmac256 = sha2.sha256_hmac
+local hmac384 = sha2.sha384_hmac
+local hmac512 = sha2.sha512_hmac
+local glue = require'glue'
+
+--from http://tools.ietf.org/html/rfc4231
+tests = {
+	{ key = (glue.fromhex'0b'):rep(20),
+			data = 'Hi There',
+			hmac256 = glue.fromhex'b0344c61d8db38535ca8afceaf0bf12b881dc200c9833da726e9376c2e32cff7',
+			hmac384 = glue.fromhex'afd03944d84895626b0825f4ab46907f15f9dadbe4101ec682aa034c7cebc59cfaea9ea9076ede7f4af152e8b2fa9cb6',
+			hmac512 = glue.fromhex'87aa7cdea5ef619d4ff0b4241a1d6cb02379f4e2ce4ec2787ad0b30545e17cdedaa833b7d6b8a702038b274eaea3f4e4be9d914eeb61f1702e696c203a126854',
+	},
+	{	key = 'Jefe',
+			data = 'what do ya want for nothing?',
+			hmac256 = glue.fromhex'5bdcc146bf60754e6a042426089575c75a003f089d2739839dec58b964ec3843',
+			hmac384 = glue.fromhex'af45d2e376484031617f78d2b58a6b1b9c7ef464f5a01b47e42ec3736322445e8e2240ca5e69e2c78b3239ecfab21649',
+			hmac512 = glue.fromhex'164b7a7bfcf819e2e395fbe73b56e0a387bd64222e831fd610270cd7ea2505549758bf75c05a994a6d034f65f8f0e6fdcaeab1a34d4a6b4b636e070a38bce737',
+	},
+	{ key = (glue.fromhex'aa'):rep(20),
+			data = (glue.fromhex'dd'):rep(50),
+			hmac256 = glue.fromhex'773ea91e36800e46854db8ebd09181a72959098b3ef8c122d9635514ced565fe',
+			hmac384 = glue.fromhex'88062608d3e6ad8a0aa2ace014c8a86f0aa635d947ac9febe83ef4e55966144b2a5ab39dc13814b94e3ab6e101a34f27',
+			hmac512 = glue.fromhex'fa73b0089d56a284efb0f0756c890be9b1b5dbdd8ee81a3655f83e33b2279d39bf3e848279a722c806b485a47e67c807b946a337bee8942674278859e13292fb',
+	},
+	{ key = glue.fromhex'0102030405060708090a0b0c0d0e0f10111213141516171819',
+			data = (glue.fromhex'cd'):rep(50),
+			hmac256 = glue.fromhex'82558a389a443c0ea4cc819899f2083a85f0faa3e578f8077a2e3ff46729665b',
+			hmac384 = glue.fromhex'3e8a69b7783c25851933ab6290af6ca77a9981480850009cc5577c6e1f573b4e6801dd23c4a7d679ccf8a386c674cffb',
+			hmac512 = glue.fromhex'b0ba465637458c6990e5a8c5f61d4af7e576d97ff94b872de76f8050361ee3dba91ca5c11aa25eb4d679275cc5788063a5f19741120c4f2de2adebeb10a298dd',
+	},
+	{ key = (glue.fromhex'aa'):rep(131),
+			data = 'Test Using Larger Than Block-Size Key - Hash Key First',
+			hmac256 = glue.fromhex'60e431591ee0b67f0d8a26aacbf5b77f8e0bc6213728c5140546040f0ee37f54',
+			hmac384 = glue.fromhex'4ece084485813e9088d2c63a041bc5b44f9ef1012a2b588f3cd11f05033ac4c60c2ef6ab4030fe8296248df163f44952',
+			hmac512 = glue.fromhex'80b24263c7c1a3ebb71493c1dd7be8b49b46d1f41b4aeec1121b013783f8f3526b56d037e05f2598bd0fd2215d6a1e5295e64f73f63f0aec8b915a985d786598',
+	},
+	{ key = (glue.fromhex'aa'):rep(131),
+			data = 'This is a test using a larger than block-size key and a larger than block-size data. The key needs to be hashed before being used by the HMAC algorithm.',
+			hmac256 = glue.fromhex'9b09ffa71b942fcb27635fbcd5b0e944bfdc63644f0713938a7f51535c3a35e2',
+			hmac384 = glue.fromhex'6617178e941f020d351e2f254e8fd32c602420feb0b8fb9adccebb82461e99c5a678cc31e799176d3860e6110c46523e',
+			hmac512 = glue.fromhex'e37b6a775dc87dbaa4dfa9f96e5e3ffddebd71f8867289865df5a32d20cdc944b6022cac3c4982b10d5eeb55c3e4de15134676fb6de0446065c97440fa8c6a58',
+	},
+}
+
+local function asserteq(test, a,b)
+	print(test, a == b and 'ok' or glue.tohex(a) .. ' ~= ' .. glue.tohex(b))
+end
+for k,test in ipairs(tests) do
+	print('test '..k)
+	assert(#test.hmac256 == 32)
+	asserteq(256, hmac256(test.data, test.key), test.hmac256)
+	assert(#test.hmac384 == 48)
+	asserteq(384, hmac384(test.data, test.key), test.hmac384)
+	assert(#test.hmac512 == 64)
+	asserteq(512, hmac512(test.data, test.key), test.hmac512)
+end
+
+
+local b64 = require'libb64'
+
+--per amazon aws example
+local message = 'GET\nwebservices.amazon.com\n/onca/xml\nAWSAccessKeyId=00000000000000000000&ItemId=0679722769&Operation=ItemLookup&ResponseGroup=ItemAttributes%2COffers%2CImages%2CReviews&Service=AWSECommerceService&Timestamp=2009-01-01T12%3A00%3A00Z&Version=2009-01-06'
+local sha = glue.fromhex'b9a1069ad38ebb31d7a6a91b542c511301a082b6f445484c3be1aa8514e1bfef' --per HashCalc
+local mac = glue.fromhex'35a71ef94dc0cf83a137bb484aa82cd6f74b0470448a359c05e0aa2f9c4df718' --per HashCalc
+local key = '1234567890' --per amazon (their dummy key)
+local b64_mac = 'Nace+U3Az4OhN7tISqgs1vdLBHBEijWcBeCqL5xN9xg=' --per amazon
+
+assert(b64.encode(mac) == b64_mac) --so our base64 encoder is good compared to HashCalc's hmac and sha
+assert(b64.decode(b64_mac) == mac) --so our base64 decoder is good compared to HashCalc's hmac and sha
+assert(sha2.sha256(message) == sha) --so our sha256 is good
+
+assert(hmac256(message, key) == mac) --so our hmac is good
+assert(b64.encode(hmac256(message, key)) == b64_mac) --so our hmac is good
+