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

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Guido van Rossum 1993-11-01 16:20:18 +00:00
parent 13ecc7a1a2
commit 0667626694
1 changed files with 15 additions and 0 deletions
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15
Modules/rotormodule.c
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@ -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);