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33 /* $FreeBSD: src/crypto/kerberosIV/lib/krb/mk_priv.c,v 1.1.1.3.2.1 2003/02/13 21:34:36 nectar Exp $ */
37 RCSID("$Id: mk_priv.c,v 1.22 1999/12/02 16:58:43 joda Exp $");
39 /* application include files */
40 #include "krb-archaeology.h"
43 * krb_mk_priv() constructs an AUTH_MSG_PRIVATE message. It takes
44 * some user data "in" of "length" bytes and creates a packet in "out"
45 * consisting of the user data, a timestamp, and the sender's network
47 * The packet is encrypted by pcbc_encrypt(), using the given
48 * "key" and "schedule".
49 * The length of the resulting packet "out" is
52 * It is similar to krb_mk_safe() except for the additional key
53 * schedule argument "schedule" and the fact that the data is encrypted
54 * rather than appended with a checksum. The protocol version is
55 * KRB_PROT_VERSION, defined in "krb.h".
57 * The "out" packet consists of:
62 * 1 byte KRB_PROT_VERSION protocol version number
63 * 1 byte AUTH_MSG_PRIVATE | message type plus local
64 * HOST_BYTE_ORDER byte order in low bit
66 * 4 bytes c_length length of data
67 * we encrypt from here with pcbc_encrypt
69 * 4 bytes length length of user data
71 * 1 byte msg_time_5ms timestamp milliseconds
72 * 4 bytes sender->sin.addr.s_addr sender's IP address
74 * 4 bytes msg_time_sec or timestamp seconds with
75 * -msg_time_sec direction in sign bit
77 * 0<=n<=7 bytes pad to 8 byte multiple zeroes
81 krb_mk_priv(void *in, void *out, u_int32_t length,
82 des_key_schedule schedule, des_cblock *key,
83 struct sockaddr_in *sender, struct sockaddr_in *receiver)
85 unsigned char *p = (unsigned char*)out;
86 unsigned char *cipher;
92 p += krb_put_int(KRB_PROT_VERSION, p, 1, 1);
93 p += krb_put_int(AUTH_MSG_PRIVATE, p, 1, 1);
95 len = 4 + length + 1 + 4 + 4;
97 p += krb_put_int(len, p, 4, 4);
101 p += krb_put_int(length, p, 4, 4);
103 memcpy(p, in, length);
106 krb_kdctimeofday(&tv);
108 *p++ =tv.tv_usec / 5000;
110 src_addr = sender->sin_addr.s_addr;
111 p += krb_put_address(src_addr, p, 4);
113 p += krb_put_int(lsb_time(tv.tv_sec, sender, receiver), p, 4, 4);
117 des_pcbc_encrypt((des_cblock *)cipher, (des_cblock *)cipher,
118 len, schedule, key, DES_ENCRYPT);
120 return (cipher - (unsigned char*)out) + len;