76 lines
2.0 KiB
JavaScript
76 lines
2.0 KiB
JavaScript
/*
|
|
4.1 authentication: (http://bazaar.launchpad.net/~mysql/mysql-server/5.5/view/head:/sql/password.c)
|
|
|
|
SERVER: public_seed=create_random_string()
|
|
send(public_seed)
|
|
|
|
CLIENT: recv(public_seed)
|
|
hash_stage1=sha1("password")
|
|
hash_stage2=sha1(hash_stage1)
|
|
reply=xor(hash_stage1, sha1(public_seed,hash_stage2)
|
|
|
|
// this three steps are done in scramble()
|
|
|
|
send(reply)
|
|
|
|
|
|
SERVER: recv(reply)
|
|
hash_stage1=xor(reply, sha1(public_seed,hash_stage2))
|
|
candidate_hash2=sha1(hash_stage1)
|
|
check(candidate_hash2==hash_stage2)
|
|
|
|
server stores sha1(sha1(password)) ( hash_stag2)
|
|
*/
|
|
|
|
var crypto = require('crypto');
|
|
|
|
function sha1(msg, msg1, msg2) {
|
|
var hash = crypto.createHash('sha1');
|
|
hash.update(msg);
|
|
if (msg1)
|
|
hash.update(msg1);
|
|
if (msg2)
|
|
hash.update(msg2);
|
|
return hash.digest();
|
|
}
|
|
|
|
function xor(a, b) {
|
|
if (!Buffer.isBuffer(a))
|
|
a = new Buffer(a, 'binary');
|
|
if (!Buffer.isBuffer(b))
|
|
b = new Buffer(b, 'binary');
|
|
var result = new Buffer(a.length);
|
|
for (var i = 0; i < a.length; i++) {
|
|
result[i] = (a[i] ^ b[i]);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
function token(password, scramble1, scramble2) {
|
|
// TODO: use buffers (not sure why strings here)
|
|
if (!password) {
|
|
return new Buffer(0);
|
|
}
|
|
var stage1 = sha1(password);
|
|
return module.exports.calculateTokenFromPasswordSha(stage1, scramble1, scramble2);
|
|
}
|
|
|
|
module.exports.calculateTokenFromPasswordSha = function(passwordSha, scramble1, scramble2) {
|
|
var stage2 = sha1(passwordSha);
|
|
var stage3 = sha1(scramble1, scramble2, stage2);
|
|
return xor(stage3, passwordSha);
|
|
};
|
|
|
|
module.exports.calculateToken = token;
|
|
|
|
module.exports.verifyToken = function(publicSeed1, publicSeed2, token, doubleSha) {
|
|
var hashStage1 =xor(token, sha1(publicSeed1, publicSeed2, doubleSha));
|
|
var candidateHash2 = sha1(hashStage1);
|
|
// TODO better way to compare buffers?
|
|
return candidateHash2.toString('hex') == doubleSha.toString('hex');
|
|
}
|
|
|
|
module.exports.doubleSha1 = function(password) {
|
|
return sha1(sha1(password));
|
|
}
|