diff options
Diffstat (limited to 'crypto/kerberosIV/lib/krb/mk_priv.c')
| -rw-r--r-- | crypto/kerberosIV/lib/krb/mk_priv.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/crypto/kerberosIV/lib/krb/mk_priv.c b/crypto/kerberosIV/lib/krb/mk_priv.c new file mode 100644 index 0000000..b6a9cc4 --- /dev/null +++ b/crypto/kerberosIV/lib/krb/mk_priv.c @@ -0,0 +1,125 @@ +/* + * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the Kungliga Tekniska + * Högskolan and its contributors. + * + * 4. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "krb_locl.h" + +RCSID("$Id: mk_priv.c,v 1.18 1997/04/01 08:18:37 joda Exp $"); + +/* application include files */ +#include "lsb_addr_comp.h" + +/* + * krb_mk_priv() constructs an AUTH_MSG_PRIVATE message. It takes + * some user data "in" of "length" bytes and creates a packet in "out" + * consisting of the user data, a timestamp, and the sender's network + * address. + * The packet is encrypted by pcbc_encrypt(), using the given + * "key" and "schedule". + * The length of the resulting packet "out" is + * returned. + * + * It is similar to krb_mk_safe() except for the additional key + * schedule argument "schedule" and the fact that the data is encrypted + * rather than appended with a checksum. The protocol version is + * KRB_PROT_VERSION, defined in "krb.h". + * + * The "out" packet consists of: + * + * Size Variable Field + * ---- -------- ----- + * + * 1 byte KRB_PROT_VERSION protocol version number + * 1 byte AUTH_MSG_PRIVATE | message type plus local + * HOST_BYTE_ORDER byte order in low bit + * + * 4 bytes c_length length of data + * we encrypt from here with pcbc_encrypt + * + * 4 bytes length length of user data + * length in user data + * 1 byte msg_time_5ms timestamp milliseconds + * 4 bytes sender->sin.addr.s_addr sender's IP address + * + * 4 bytes msg_time_sec or timestamp seconds with + * -msg_time_sec direction in sign bit + * + * 0<=n<=7 bytes pad to 8 byte multiple zeroes + */ + +int32_t +krb_mk_priv(void *in, void *out, u_int32_t length, + struct des_ks_struct *schedule, des_cblock *key, + struct sockaddr_in *sender, struct sockaddr_in *receiver) +{ + unsigned char *p = (unsigned char*)out; + unsigned char *cipher; + + struct timeval tv; + u_int32_t src_addr; + u_int32_t len; + + p += krb_put_int(KRB_PROT_VERSION, p, 1); + p += krb_put_int(AUTH_MSG_PRIVATE, p, 1); + + len = 4 + length + 1 + 4 + 4; + len = (len + 7) & ~7; + p += krb_put_int(len, p, 4); + + cipher = p; + + p += krb_put_int(length, p, 4); + + memcpy(p, in, length); + p += length; + + gettimeofday(&tv, NULL); + + *p++ =tv.tv_usec / 5000; + + src_addr = sender->sin_addr.s_addr; + p += krb_put_address(src_addr, p); + + p += krb_put_int(lsb_time(tv.tv_sec, sender, receiver), p, 4); + + memset(p, 0, 7); + + des_pcbc_encrypt((des_cblock *)cipher, (des_cblock *)cipher, + len, schedule, key, DES_ENCRYPT); + + return (cipher - (unsigned char*)out) + len; +} |
