mirrors/cpython
0
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2024-12-14 20:34:12 +08:00
Code Issues Packages Projects Releases Wiki Activity

Replace <<-13 by >>13. Leave old code in #ifdef BUGGY_CODE_BW_COMPAT.

Browse Source
This commit is contained in:
Guido van Rossum 1993-11-01 16:20:18 +00:00
parent 13ecc7a1a2
commit 0667626694
1 changed files with 15 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
Modules/rotormodule.c
View File

@ -158,11 +158,26 @@ char *key;
int i;
int len=strlen(key);
for (i=0;i<len;i++) {
#ifdef BUGGY_CODE_BW_COMPAT
/* This is the code as it was originally released.
It causes warnings on many systems and can generate
different results as well. If you have files
encrypted using an older version you may want to
#define BUGGY_CODE_BW_COMPAT so as to be able to
decrypt them... */
k1 = (((k1<<3 | k1<<-13) + key[i]) & 65535);
k2 = (((k2<<3 | k2<<-13) ^ key[i]) & 65535);
k3 = (((k3<<3 | k3<<-13) - key[i]) & 65535);
k4 = ((key[i] - (k4<<3 | k4<<-13)) & 65535);
k5 = (((k5<<3 | k5<<-13) ^ ~key[i]) & 65535);
#else
/* This code should be more portable */
k1 = (((k1<<3 | k1>>13) + key[i]) & 65535);
k2 = (((k2<<3 | k2>>13) ^ key[i]) & 65535);
k3 = (((k3<<3 | k3>>13) - key[i]) & 65535);
k4 = ((key[i] - (k4<<3 | k4>>13)) & 65535);
k5 = (((k5<<3 | k5>>13) ^ ~key[i]) & 65535);
#endif
}
r->key[0] = (short)k1;
r->key[1] = (short)(k2|1);