2 * Copyright (c) 1999 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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36 RCSID("$Id: str2key.c,v 1.17 1999/12/02 16:58:44 joda Exp $");
38 #define lowcase(c) (('A' <= (c) && (c) <= 'Z') ? ((c) - 'A' + 'a') : (c))
41 * The string to key function used by Transarc AFS.
44 afs_string_to_key(const char *pass, const char *cell, des_cblock *key)
46 if (strlen(pass) <= 8) /* Short passwords. */
52 * XOR cell and password and pad (or fill) with 'X' to length 8,
53 * then use crypt(3) to create DES key.
55 for (i = 0; i < 8; i++)
57 buf[i] = *pass ^ lowcase(*cell);
67 s = crypt(buf, "p1"); /* Result from crypt is 7bit chars. */
68 s = s + 2; /* Skip 2 chars of salt. */
69 for (i = 0; i < 8; i++)
70 ((char *) key)[i] = s[i] << 1; /* High bit is always zero */
71 des_fixup_key_parity(key); /* Low bit is parity */
73 else /* Long passwords */
77 des_key_schedule sched;
81 * Concatenate password with cell name,
82 * then checksum twice to create DES key.
86 buf = malloc(plen + clen + 1);
87 memcpy(buf, pass, plen);
88 for (t = buf + plen; *cell != 0; t++, cell++)
91 memcpy(&ivec, "kerberos", 8);
92 memcpy(key, "kdsbdsns", 8);
93 des_key_sched(key, sched);
94 /* Beware, ivec is passed twice */
95 des_cbc_cksum((des_cblock *)buf, &ivec, plen + clen, sched, &ivec);
97 memcpy(key, &ivec, 8);
98 des_fixup_key_parity(key);
99 des_key_sched(key, sched);
100 /* Beware, ivec is passed twice */
101 des_cbc_cksum((des_cblock *)buf, key, plen + clen, sched, &ivec);
103 des_fixup_key_parity(key);