1*0Sstevel@tonic-gate /* crypto/des/enc_writ.c */
2*0Sstevel@tonic-gate /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3*0Sstevel@tonic-gate * All rights reserved.
4*0Sstevel@tonic-gate *
5*0Sstevel@tonic-gate * This package is an SSL implementation written
6*0Sstevel@tonic-gate * by Eric Young (eay@cryptsoft.com).
7*0Sstevel@tonic-gate * The implementation was written so as to conform with Netscapes SSL.
8*0Sstevel@tonic-gate *
9*0Sstevel@tonic-gate * This library is free for commercial and non-commercial use as long as
10*0Sstevel@tonic-gate * the following conditions are aheared to. The following conditions
11*0Sstevel@tonic-gate * apply to all code found in this distribution, be it the RC4, RSA,
12*0Sstevel@tonic-gate * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13*0Sstevel@tonic-gate * included with this distribution is covered by the same copyright terms
14*0Sstevel@tonic-gate * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15*0Sstevel@tonic-gate *
16*0Sstevel@tonic-gate * Copyright remains Eric Young's, and as such any Copyright notices in
17*0Sstevel@tonic-gate * the code are not to be removed.
18*0Sstevel@tonic-gate * If this package is used in a product, Eric Young should be given attribution
19*0Sstevel@tonic-gate * as the author of the parts of the library used.
20*0Sstevel@tonic-gate * This can be in the form of a textual message at program startup or
21*0Sstevel@tonic-gate * in documentation (online or textual) provided with the package.
22*0Sstevel@tonic-gate *
23*0Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without
24*0Sstevel@tonic-gate * modification, are permitted provided that the following conditions
25*0Sstevel@tonic-gate * are met:
26*0Sstevel@tonic-gate * 1. Redistributions of source code must retain the copyright
27*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer.
28*0Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright
29*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in the
30*0Sstevel@tonic-gate * documentation and/or other materials provided with the distribution.
31*0Sstevel@tonic-gate * 3. All advertising materials mentioning features or use of this software
32*0Sstevel@tonic-gate * must display the following acknowledgement:
33*0Sstevel@tonic-gate * "This product includes cryptographic software written by
34*0Sstevel@tonic-gate * Eric Young (eay@cryptsoft.com)"
35*0Sstevel@tonic-gate * The word 'cryptographic' can be left out if the rouines from the library
36*0Sstevel@tonic-gate * being used are not cryptographic related :-).
37*0Sstevel@tonic-gate * 4. If you include any Windows specific code (or a derivative thereof) from
38*0Sstevel@tonic-gate * the apps directory (application code) you must include an acknowledgement:
39*0Sstevel@tonic-gate * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40*0Sstevel@tonic-gate *
41*0Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42*0Sstevel@tonic-gate * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43*0Sstevel@tonic-gate * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44*0Sstevel@tonic-gate * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45*0Sstevel@tonic-gate * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46*0Sstevel@tonic-gate * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47*0Sstevel@tonic-gate * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48*0Sstevel@tonic-gate * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49*0Sstevel@tonic-gate * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50*0Sstevel@tonic-gate * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51*0Sstevel@tonic-gate * SUCH DAMAGE.
52*0Sstevel@tonic-gate *
53*0Sstevel@tonic-gate * The licence and distribution terms for any publically available version or
54*0Sstevel@tonic-gate * derivative of this code cannot be changed. i.e. this code cannot simply be
55*0Sstevel@tonic-gate * copied and put under another distribution licence
56*0Sstevel@tonic-gate * [including the GNU Public Licence.]
57*0Sstevel@tonic-gate */
58*0Sstevel@tonic-gate
59*0Sstevel@tonic-gate #include <errno.h>
60*0Sstevel@tonic-gate #include <time.h>
61*0Sstevel@tonic-gate #include <stdio.h>
62*0Sstevel@tonic-gate #include "cryptlib.h"
63*0Sstevel@tonic-gate #include "des_locl.h"
64*0Sstevel@tonic-gate #include <openssl/rand.h>
65*0Sstevel@tonic-gate
66*0Sstevel@tonic-gate /*
67*0Sstevel@tonic-gate * WARNINGS:
68*0Sstevel@tonic-gate *
69*0Sstevel@tonic-gate * - The data format used by DES_enc_write() and DES_enc_read()
70*0Sstevel@tonic-gate * has a cryptographic weakness: When asked to write more
71*0Sstevel@tonic-gate * than MAXWRITE bytes, DES_enc_write will split the data
72*0Sstevel@tonic-gate * into several chunks that are all encrypted
73*0Sstevel@tonic-gate * using the same IV. So don't use these functions unless you
74*0Sstevel@tonic-gate * are sure you know what you do (in which case you might
75*0Sstevel@tonic-gate * not want to use them anyway).
76*0Sstevel@tonic-gate *
77*0Sstevel@tonic-gate * - This code cannot handle non-blocking sockets.
78*0Sstevel@tonic-gate */
79*0Sstevel@tonic-gate
DES_enc_write(int fd,const void * _buf,int len,DES_key_schedule * sched,DES_cblock * iv)80*0Sstevel@tonic-gate int DES_enc_write(int fd, const void *_buf, int len,
81*0Sstevel@tonic-gate DES_key_schedule *sched, DES_cblock *iv)
82*0Sstevel@tonic-gate {
83*0Sstevel@tonic-gate #ifdef _LIBC
84*0Sstevel@tonic-gate extern unsigned long time();
85*0Sstevel@tonic-gate extern int write();
86*0Sstevel@tonic-gate #endif
87*0Sstevel@tonic-gate const unsigned char *buf=_buf;
88*0Sstevel@tonic-gate long rnum;
89*0Sstevel@tonic-gate int i,j,k,outnum;
90*0Sstevel@tonic-gate static unsigned char *outbuf=NULL;
91*0Sstevel@tonic-gate unsigned char shortbuf[8];
92*0Sstevel@tonic-gate unsigned char *p;
93*0Sstevel@tonic-gate const unsigned char *cp;
94*0Sstevel@tonic-gate static int start=1;
95*0Sstevel@tonic-gate
96*0Sstevel@tonic-gate if (outbuf == NULL)
97*0Sstevel@tonic-gate {
98*0Sstevel@tonic-gate outbuf=OPENSSL_malloc(BSIZE+HDRSIZE);
99*0Sstevel@tonic-gate if (outbuf == NULL) return(-1);
100*0Sstevel@tonic-gate }
101*0Sstevel@tonic-gate /* If we are sending less than 8 bytes, the same char will look
102*0Sstevel@tonic-gate * the same if we don't pad it out with random bytes */
103*0Sstevel@tonic-gate if (start)
104*0Sstevel@tonic-gate {
105*0Sstevel@tonic-gate start=0;
106*0Sstevel@tonic-gate }
107*0Sstevel@tonic-gate
108*0Sstevel@tonic-gate /* lets recurse if we want to send the data in small chunks */
109*0Sstevel@tonic-gate if (len > MAXWRITE)
110*0Sstevel@tonic-gate {
111*0Sstevel@tonic-gate j=0;
112*0Sstevel@tonic-gate for (i=0; i<len; i+=k)
113*0Sstevel@tonic-gate {
114*0Sstevel@tonic-gate k=DES_enc_write(fd,&(buf[i]),
115*0Sstevel@tonic-gate ((len-i) > MAXWRITE)?MAXWRITE:(len-i),sched,iv);
116*0Sstevel@tonic-gate if (k < 0)
117*0Sstevel@tonic-gate return(k);
118*0Sstevel@tonic-gate else
119*0Sstevel@tonic-gate j+=k;
120*0Sstevel@tonic-gate }
121*0Sstevel@tonic-gate return(j);
122*0Sstevel@tonic-gate }
123*0Sstevel@tonic-gate
124*0Sstevel@tonic-gate /* write length first */
125*0Sstevel@tonic-gate p=outbuf;
126*0Sstevel@tonic-gate l2n(len,p);
127*0Sstevel@tonic-gate
128*0Sstevel@tonic-gate /* pad short strings */
129*0Sstevel@tonic-gate if (len < 8)
130*0Sstevel@tonic-gate {
131*0Sstevel@tonic-gate cp=shortbuf;
132*0Sstevel@tonic-gate memcpy(shortbuf,buf,len);
133*0Sstevel@tonic-gate RAND_pseudo_bytes(shortbuf+len, 8-len);
134*0Sstevel@tonic-gate rnum=8;
135*0Sstevel@tonic-gate }
136*0Sstevel@tonic-gate else
137*0Sstevel@tonic-gate {
138*0Sstevel@tonic-gate cp=buf;
139*0Sstevel@tonic-gate rnum=((len+7)/8*8); /* round up to nearest eight */
140*0Sstevel@tonic-gate }
141*0Sstevel@tonic-gate
142*0Sstevel@tonic-gate if (DES_rw_mode & DES_PCBC_MODE)
143*0Sstevel@tonic-gate DES_pcbc_encrypt(cp,&(outbuf[HDRSIZE]),(len<8)?8:len,sched,iv,
144*0Sstevel@tonic-gate DES_ENCRYPT);
145*0Sstevel@tonic-gate else
146*0Sstevel@tonic-gate DES_cbc_encrypt(cp,&(outbuf[HDRSIZE]),(len<8)?8:len,sched,iv,
147*0Sstevel@tonic-gate DES_ENCRYPT);
148*0Sstevel@tonic-gate
149*0Sstevel@tonic-gate /* output */
150*0Sstevel@tonic-gate outnum=rnum+HDRSIZE;
151*0Sstevel@tonic-gate
152*0Sstevel@tonic-gate for (j=0; j<outnum; j+=i)
153*0Sstevel@tonic-gate {
154*0Sstevel@tonic-gate /* eay 26/08/92 I was not doing writing from where we
155*0Sstevel@tonic-gate * got up to. */
156*0Sstevel@tonic-gate i=write(fd,(void *)&(outbuf[j]),outnum-j);
157*0Sstevel@tonic-gate if (i == -1)
158*0Sstevel@tonic-gate {
159*0Sstevel@tonic-gate #ifdef EINTR
160*0Sstevel@tonic-gate if (errno == EINTR)
161*0Sstevel@tonic-gate i=0;
162*0Sstevel@tonic-gate else
163*0Sstevel@tonic-gate #endif
164*0Sstevel@tonic-gate /* This is really a bad error - very bad
165*0Sstevel@tonic-gate * It will stuff-up both ends. */
166*0Sstevel@tonic-gate return(-1);
167*0Sstevel@tonic-gate }
168*0Sstevel@tonic-gate }
169*0Sstevel@tonic-gate
170*0Sstevel@tonic-gate return(len);
171*0Sstevel@tonic-gate }
172