d7827cfb24
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@874 ec53bebd-3082-4978-b11e-865c3cabbd6b
142 lines
2.5 KiB
C
142 lines
2.5 KiB
C
#include <krb5_locl.h>
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/*
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* Reverse 8 bytes
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*/
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static void
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reverse (unsigned char *s)
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{
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static unsigned char tbl[] = {
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0x0,
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0x8,
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0x4,
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0xC,
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0x2,
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0xA,
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0x6,
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0xE,
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0x1,
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0x9,
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0x5,
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0xD,
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0x3,
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0xB,
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0x7,
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0xF
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};
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char tmp;
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#define REVONE(str, i, j) \
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do { tmp = str[i]; str[i] = str[j]; str[j] = tmp;} while(0)
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REVONE(s,0,7);
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REVONE(s,1,6);
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REVONE(s,2,5);
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REVONE(s,3,4);
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#undef REVONE
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#define REVTWO(q) \
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q = (tbl[q & 0x0F] << 4) | (tbl[q >> 4])
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REVTWO(s[0]);
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REVTWO(s[1]);
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REVTWO(s[2]);
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REVTWO(s[3]);
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REVTWO(s[4]);
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REVTWO(s[5]);
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REVTWO(s[6]);
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REVTWO(s[7]);
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#undef REVTWO
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}
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/*
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* A = A xor B. A & B is 8 bytes.
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*/
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static void
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xor (unsigned char *a, unsigned char *b)
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{
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a[0] ^= b[0];
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a[1] ^= b[1];
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a[2] ^= b[2];
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a[3] ^= b[3];
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a[4] ^= b[4];
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a[5] ^= b[5];
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a[6] ^= b[6];
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a[7] ^= b[7];
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}
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/*
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* Init a from b
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*/
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static void
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init (unsigned char *a, unsigned char *b)
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{
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a[0] = b[0] << 1;
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a[1] = b[1] << 1;
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a[2] = b[2] << 1;
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a[3] = b[3] << 1;
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a[4] = b[4] << 1;
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a[5] = b[5] << 1;
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a[6] = b[6] << 1;
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a[7] = b[7] << 1;
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}
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krb5_error_code
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krb5_string_to_key (char *str,
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krb5_data *salt,
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krb5_keyblock *key)
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{
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int odd, i;
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size_t len;
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char *s, *p;
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des_cblock tempkey;
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des_key_schedule sched;
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krb5_error_code err;
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len = strlen(str) + salt->length;
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#if 1
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len = (len + 7) / 8 * 8;
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#endif
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p = s = malloc (len);
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if (p == NULL)
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return ENOMEM;
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err = krb5_data_alloc (&key->contents, sizeof(des_cblock));
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if (err) {
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free (p);
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return err;
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}
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memset (s, 0, len);
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strncpy (p, str, strlen(str));
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p += strlen(str);
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strncpy (p, salt->data, salt->length);
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odd = 1;
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memset (tempkey, 0, sizeof(tempkey));
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for (i = 0; i < len; i += 8) {
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unsigned char tmp[8];
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init (tmp, (unsigned char*)&s[i]);
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if (odd == 0) {
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odd = 1;
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reverse (tmp);
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init (tmp, tmp);
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} else
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odd = 0;
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xor (tempkey, tmp);
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}
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des_set_odd_parity (&tempkey);
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des_set_key (&tempkey, sched);
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des_cbc_cksum ((des_cblock *)s, &tempkey, len, sched, &tempkey);
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free (s);
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des_set_odd_parity (&tempkey);
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if (des_is_weak_key (&tempkey))
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xor ((unsigned char *)&tempkey, (unsigned char*)"0x000x000x000x000x000x000x000xF0");
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memcpy (key->contents.data, &tempkey, sizeof(tempkey));
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return 0;
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}
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