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Bug 617868 - RFC-5869 compliant HKDF implementation with test vectors. r=mconnor

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This commit is contained in:
Philipp von Weitershausen 2010-12-09 12:14:08 -08:00
parent b3a296aa95
commit d34fb9c651
2 changed files with 117 additions and 0 deletions
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17
services/sync/modules/util.js
View File

@ -674,6 +674,23 @@ let Utils = {
return h.finish(false);
},
/**
* HMAC-based Key Derivation Step 2 according to RFC 5869.
*/
hkdfExpand: function hkdfExpand(prk, info, len) {
const BLOCKSIZE = 256 / 8;
let h = Utils.makeHMACHasher();
let T = "";
let Tn = "";
let iterations = Math.ceil(len/BLOCKSIZE);
for (let i = 0; i < iterations; i++) {
Tn = Utils.sha256HMACBytes(Tn + info + String.fromCharCode(i + 1),
Utils.makeHMACKey(prk), h);
T += Tn;
}
return T.slice(0, len);
},
byteArrayToString: function byteArrayToString(bytes) {
return [String.fromCharCode(byte) for each (byte in bytes)].join("");
},

100
services/sync/tests/unit/test_utils_hkdfExpand.js Normal file
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@ -0,0 +1,100 @@
Cu.import("resource://services-sync/util.js");
// Test vectors from RFC 5869
// Test case 1
let tc1 = {
IKM: "0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b",
salt: "000102030405060708090a0b0c",
info: "f0f1f2f3f4f5f6f7f8f9",
L: 42,
PRK: "077709362c2e32df0ddc3f0dc47bba63" +
"90b6c73bb50f9c3122ec844ad7c2b3e5",
OKM: "3cb25f25faacd57a90434f64d0362f2a" +
"2d2d0a90cf1a5a4c5db02d56ecc4c5bf" +
"34007208d5b887185865"
};
// Test case 2
let tc2 = {
IKM: "000102030405060708090a0b0c0d0e0f" +
"101112131415161718191a1b1c1d1e1f" +
"202122232425262728292a2b2c2d2e2f" +
"303132333435363738393a3b3c3d3e3f" +
"404142434445464748494a4b4c4d4e4f",
salt: "606162636465666768696a6b6c6d6e6f" +
"707172737475767778797a7b7c7d7e7f" +
"808182838485868788898a8b8c8d8e8f" +
"909192939495969798999a9b9c9d9e9f" +
"a0a1a2a3a4a5a6a7a8a9aaabacadaeaf",
info: "b0b1b2b3b4b5b6b7b8b9babbbcbdbebf" +
"c0c1c2c3c4c5c6c7c8c9cacbcccdcecf" +
"d0d1d2d3d4d5d6d7d8d9dadbdcdddedf" +
"e0e1e2e3e4e5e6e7e8e9eaebecedeeef" +
"f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff",
L: 82,
PRK: "06a6b88c5853361a06104c9ceb35b45c" +
"ef760014904671014a193f40c15fc244",
OKM: "b11e398dc80327a1c8e7f78c596a4934" +
"4f012eda2d4efad8a050cc4c19afa97c" +
"59045a99cac7827271cb41c65e590e09" +
"da3275600c2f09b8367793a9aca3db71" +
"cc30c58179ec3e87c14c01d5c1f3434f" +
"1d87"
};
// Test case 3
let tc3 = {
IKM: "0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b",
salt: "",
info: "",
L: 42,
PRK: "19ef24a32c717b167f33a91d6f648bdf" +
"96596776afdb6377ac434c1c293ccb04",
OKM: "8da4e775a563c18f715f802a063c5a31" +
"b8a11f5c5ee1879ec3454e5f3c738d2d" +
"9d201395faa4b61a96c8"
};
function _hexToString(hex) {
let ret = "";
if (hex.length % 2 != 0) {
return false;
}
for (let i = 0; i < hex.length; i += 2) {
let cur = hex[i] + hex[i + 1];
ret += String.fromCharCode(parseInt(cur, 16));
}
return ret;
}
function extract_hex(salt, ikm) {
salt = _hexToString(salt);
ikm = _hexToString(ikm);
return Utils.bytesAsHex(
Utils.sha256HMACBytes(ikm, Utils.makeHMACKey(salt)));
}
function expand_hex(prk, info, len) {
prk = _hexToString(prk);
info = _hexToString(info);
return Utils.bytesAsHex(Utils.hkdfExpand(prk, info, len));
}
function run_test() {
_("Verifying Test Case 1");
do_check_eq(extract_hex(tc1.salt, tc1.IKM), tc1.PRK);
do_check_eq(expand_hex(tc1.PRK, tc1.info, tc1.L), tc1.OKM);
_("Verifying Test Case 2");
do_check_eq(extract_hex(tc2.salt, tc2.IKM), tc2.PRK);
do_check_eq(expand_hex(tc2.PRK, tc2.info, tc2.L), tc2.OKM);
_("Verifying Test Case 3");
do_check_eq(extract_hex(tc3.salt, tc3.IKM), tc3.PRK);
do_check_eq(expand_hex(tc3.PRK, tc3.info, tc3.L), tc3.OKM);
}