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36 RCSID("$Id: create_ciph.c,v 1.13 1999/12/02 16:58:41 joda Exp $");
39 * This routine is used by the authentication server to create
40 * a packet for its client, containing a ticket for the requested
41 * service (given in "tkt"), and some information about the ticket,
43 * Returns KSUCCESS no matter what.
45 * The length of the cipher is stored in c->length; the format of
46 * c->dat is as follows:
49 * type or constant data
50 * ---- ----------- ----
53 * 8 bytes session session key for client, service
55 * string service service name
57 * string instance service instance
59 * string realm KDC realm
61 * unsigned char life ticket lifetime
63 * unsigned char kvno service key version number
65 * unsigned char tkt->length length of following ticket
67 * data tkt->dat ticket for service
69 * 4 bytes kdc_time KDC's timestamp
71 * <=7 bytes null null pad to 8 byte multiple
76 create_ciph(KTEXT c, /* Text block to hold ciphertext */
77 unsigned char *session, /* Session key to send to user */
78 char *service, /* Service name on ticket */
79 char *instance, /* Instance name on ticket */
80 char *realm, /* Realm of this KDC */
81 u_int32_t life, /* Lifetime of the ticket */
82 int kvno, /* Key version number for service */
83 KTEXT tkt, /* The ticket for the service */
84 u_int32_t kdc_time, /* KDC time */
85 des_cblock *key) /* Key to encrypt ciphertext with */
88 unsigned char *p = c->dat;
89 size_t rem = sizeof(c->dat);
92 memset(c, 0, sizeof(KTEXT_ST));
96 memcpy(p, session, 8);
100 tmp = krb_put_nir(service, instance, realm, p, rem);
107 tmp = krb_put_int(life, p, rem, 1);
113 tmp = krb_put_int(kvno, p, rem, 1);
119 tmp = krb_put_int(tkt->length, p, rem, 1);
125 if (rem < tkt->length)
127 memcpy(p, tkt->dat, tkt->length);
131 tmp = krb_put_int(kdc_time, p, rem, 4);
137 /* multiple of eight bytes */
138 c->length = (p - c->dat + 7) & ~7;
140 encrypt_ktext(c, key, DES_ENCRYPT);