util.dbuffer: Add efficient shortcuts for discard() in certain cases
If the buffer is already empty, nothing to do. If we're throwing away the
whole buffer, we can just empty it and avoid read_chunk() (which in turn
may collapse()). These shortcuts are much more efficient.
-- Test vectors from RFC 6070
local hashes = require "util.hashes";
local hex = require "util.hex";
-- Also see spec for util.hmac where HMAC test cases reside
describe("PBKDF2-HMAC-SHA1", function ()
it("test vector 1", function ()
local P = "password"
local S = "salt"
local c = 1
local DK = "0c60c80f961f0e71f3a9b524af6012062fe037a6";
assert.equal(DK, hex.encode(hashes.pbkdf2_hmac_sha1(P, S, c)));
end);
it("test vector 2", function ()
local P = "password"
local S = "salt"
local c = 2
local DK = "ea6c014dc72d6f8ccd1ed92ace1d41f0d8de8957";
assert.equal(DK, hex.encode(hashes.pbkdf2_hmac_sha1(P, S, c)));
end);
it("test vector 3", function ()
local P = "password"
local S = "salt"
local c = 4096
local DK = "4b007901b765489abead49d926f721d065a429c1";
assert.equal(DK, hex.encode(hashes.pbkdf2_hmac_sha1(P, S, c)));
end);
it("test vector 4 #SLOW", function ()
local P = "password"
local S = "salt"
local c = 16777216
local DK = "eefe3d61cd4da4e4e9945b3d6ba2158c2634e984";
assert.equal(DK, hex.encode(hashes.pbkdf2_hmac_sha1(P, S, c)));
end);
end);
describe("PBKDF2-HMAC-SHA256", function ()
it("test vector 1", function ()
local P = "password";
local S = "salt";
local c = 1
local DK = "120fb6cffcf8b32c43e7225256c4f837a86548c92ccc35480805987cb70be17b";
assert.equal(DK, hex.encode(hashes.pbkdf2_hmac_sha256(P, S, c)));
end);
it("test vector 2", function ()
local P = "password";
local S = "salt";
local c = 2
local DK = "ae4d0c95af6b46d32d0adff928f06dd02a303f8ef3c251dfd6e2d85a95474c43";
assert.equal(DK, hex.encode(hashes.pbkdf2_hmac_sha256(P, S, c)));
end);
end);
describe("SHA-3", function ()
describe("256", function ()
it("works", function ()
local expected = "a7ffc6f8bf1ed76651c14756a061d662f580ff4de43b49fa82d80a4b80f8434a"
assert.equal(expected, hashes.sha3_256("", true));
end);
end);
describe("512", function ()
it("works", function ()
local expected = "a69f73cca23a9ac5c8b567dc185a756e97c982164fe25859e0d1dcc1475c80a615b2123af1f5f94c11e3e9402c3ac558f500199d95b6d3e301758586281dcd26"
assert.equal(expected, hashes.sha3_512("", true));
end);
end);
end);