flewkey/cuberite-2a
1
0
Fork 0
Code Releases Activity

Usernames are lowercased before generating offline UUID.

Browse Source 
This breaks previous offline UUIDs, but it guarantees that future offline UUIDs will be the same even for usernames with wrong capitalization.
This commit is contained in:
Mattes D 2014-10-15 13:41:23 +02:00
parent 7f8118e0cb
commit c6725f8d28
1 changed files with 4 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
src/ClientHandle.cpp
View File

@ -248,9 +248,12 @@ AString cClientHandle::GenerateOfflineUUID(const AString & a_Username)
// xxxxxxxx-xxxx-3xxx-yxxx-xxxxxxxxxxxx where x is any hexadecimal digit and y is one of 8, 9, A, or B
// Note that we generate a short UUID (without the dashes)
// First make the username lowercase:
AString lcUsername = StrToLower(a_Username);
// Generate an md5 checksum, and use it as base for the ID:
unsigned char MD5[16];
md5((const unsigned char *)a_Username.c_str(), a_Username.length(), MD5);
md5((const unsigned char *)lcUsername.c_str(), lcUsername.length(), MD5);
MD5[6] &= 0x0f; // Need to trim to 4 bits only...
MD5[8] &= 0x0f; // ... otherwise %01x overflows into two chars
return Printf("%02x%02x%02x%02x%02x%02x3%01x%02x8%01x%02x%02x%02x%02x%02x%02x%02x",