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(RC2_set_key): handle keys where effective bits are diffrent from keylength

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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@13755 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Love Hörnquist Åstrand
2004-04-24 12:05:26 +00:00
parent 5c405cf489
commit d3ee5536f7
1 changed files with 19 additions and 4 deletions
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23
lib/des/rc2.c
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@@ -42,8 +42,8 @@ RCSID("$Id$");
#include <string.h>
/*
* Implemented from Peter Gutmann's
* Specification for Ron Rivests Cipher No.2
* Implemented from Peter Gutmann's "Specification for Ron Rivests Cipher No.2"
* rfc2268 and "On the Design and Security of RC2" was also useful.
*/
static unsigned int Sbox[256] = {
@@ -85,13 +85,28 @@ void
RC2_set_key(RC2_KEY *key, int len, const unsigned char *data, int bits)
{
unsigned char k[128];
int j;
int j, T8, TM;
if (len > 128)
len = 128;
if (bits <= 0 || bits > 1024)
bits = 1024;
for (j = 0; j < len; j++)
k[j] = data[j];
for (; j < 128; j++)
k[j] = Sbox[(k[j - len] + k[j - 1]) & 0xff];
k[0] = Sbox[k[0] & 0xff];
T8 = (bits + 7) / 8;
j = 8 - (8*T8 - bits);
TM = 0;
while (j-- > 0)
TM = TM << 1 | 1;
k[128 - T8] = Sbox[k[128 - T8] & TM];
for (j = 127 - T8; j >= 0; j--)
k[j] = Sbox[k[j + 1] ^ k[j + T8]];
for (j = 0; j < 64; j++)
key->data[j] = k[(j * 2) + 0] | (k[(j * 2) + 1] << 8);