1 files changed, 38 insertions, 0 deletions
diff --git a/spec/util_hashes_spec.lua b/spec/util_hashes_spec.lua
index b3b81467..f9f1633e 100644
--- a/spec/util_hashes_spec.lua
+++ b/spec/util_hashes_spec.lua
@@ -68,3 +68,41 @@ describe("SHA-3", function ()
 	end);
 end);
 
+describe("HKDF", function ()
+	describe("HMAC-SHA256", function ()
+		describe("RFC 5869", function ()
+			it("test vector A.1", function ()
+				local ikm = hex.decode("0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b");
+				local salt = hex.decode("000102030405060708090a0b0c");
+				local info = hex.decode("f0f1f2f3f4f5f6f7f8f9");
+
+				local expected = "3cb25f25faacd57a90434f64d0362f2a2d2d0a90cf1a5a4c5db02d56ecc4c5bf34007208d5b887185865";
+
+				local ret = hashes.hkdf_hmac_sha256(42, ikm, salt, info);
+				assert.equal(expected, hex.encode(ret));
+			end);
+
+			it("test vector A.2", function ()
+				local ikm = hex.decode("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f");
+				local salt = hex.decode("606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9aaabacadaeaf");
+				local info = hex.decode("b0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfeff");
+
+				local expected = "b11e398dc80327a1c8e7f78c596a49344f012eda2d4efad8a050cc4c19afa97c59045a99cac7827271cb41c65e590e09da3275600c2f09b8367793a9aca3db71cc30c58179ec3e87c14c01d5c1f3434f1d87";
+
+				local ret = hashes.hkdf_hmac_sha256(82, ikm, salt, info);
+				assert.equal(expected, hex.encode(ret));
+			end);
+
+			it("test vector A.3", function ()
+				local ikm = hex.decode("0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b");
+				local salt = "";
+				local info = "";
+
+				local expected = "8da4e775a563c18f715f802a063c5a31b8a11f5c5ee1879ec3454e5f3c738d2d9d201395faa4b61a96c8";
+
+				local ret = hashes.hkdf_hmac_sha256(42, ikm, salt, info);
+				assert.equal(expected, hex.encode(ret));
+			end);
+		end);
+	end);
+end);