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34 #include "sasl_mac_krb_locl.h"
36 RCSID("$Id: mk_priv.c,v 1.2 2001/12/04 02:06:08 rjs3 Exp $");
38 /* application include files */
39 #include "krb-archaeology.h"
42 * krb_mk_priv() constructs an AUTH_MSG_PRIVATE message. It takes
43 * some user data "in" of "length" bytes and creates a packet in "out"
44 * consisting of the user data, a timestamp, and the sender's network
46 * The packet is encrypted by pcbc_encrypt(), using the given
47 * "key" and "schedule".
48 * The length of the resulting packet "out" is
51 * It is similar to krb_mk_safe() except for the additional key
52 * schedule argument "schedule" and the fact that the data is encrypted
53 * rather than appended with a checksum. The protocol version is
54 * KRB_PROT_VERSION, defined in "krb.h".
56 * The "out" packet consists of:
61 * 1 byte KRB_PROT_VERSION protocol version number
62 * 1 byte AUTH_MSG_PRIVATE | message type plus local
63 * HOST_BYTE_ORDER byte order in low bit
65 * 4 bytes c_length length of data
66 * we encrypt from here with pcbc_encrypt
68 * 4 bytes length length of user data
70 * 1 byte msg_time_5ms timestamp milliseconds
71 * 4 bytes sender->sin.addr.s_addr sender's IP address
73 * 4 bytes msg_time_sec or timestamp seconds with
74 * -msg_time_sec direction in sign bit
76 * 0<=n<=7 bytes pad to 8 byte multiple zeroes
80 krb_mk_priv(void *in, void *out, u_int32_t length,
81 struct des_ks_struct *schedule, des_cblock *key,
82 struct sockaddr_in *sender, struct sockaddr_in *receiver)
84 unsigned char *p = (unsigned char*)out;
85 unsigned char *cipher;
91 p += krb_put_int(KRB_PROT_VERSION, p, 1, 1);
92 p += krb_put_int(AUTH_MSG_PRIVATE, p, 1, 1);
94 len = 4 + length + 1 + 4 + 4;
96 p += krb_put_int(len, p, 4, 4);
100 p += krb_put_int(length, p, 4, 4);
102 memcpy(p, in, length);
105 krb_kdctimeofday(&tv);
107 *p++ =tv.tv_usec / 5000;
109 src_addr = sender->sin_addr.s_addr;
110 p += krb_put_address(src_addr, p, 4);
112 p += krb_put_int(lsb_time(tv.tv_sec, sender, receiver), p, 4, 4);
116 des_pcbc_encrypt((des_cblock *)cipher, (des_cblock *)cipher,
117 len, schedule, key, DES_ENCRYPT);
119 return (cipher - (unsigned char*)out) + len;