1 /* crypto/des/enc_writ.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59 #include <errno.h>
60 #include <time.h>
61 #include <stdio.h>
62 #include "cryptlib.h"
63 #include "des_locl.h"
64 #include <openssl/rand.h>
65
66 /*
67 * WARNINGS:
68 *
69 * - The data format used by DES_enc_write() and DES_enc_read()
70 * has a cryptographic weakness: When asked to write more
71 * than MAXWRITE bytes, DES_enc_write will split the data
72 * into several chunks that are all encrypted
73 * using the same IV. So don't use these functions unless you
74 * are sure you know what you do (in which case you might
75 * not want to use them anyway).
76 *
77 * - This code cannot handle non-blocking sockets.
78 */
79
80 int DES_enc_write(int fd, const void *_buf, int len,
81 DES_key_schedule *sched, DES_cblock *iv)
82 {
83 #if defined(OPENSSL_NO_POSIX_IO)
84 return (-1);
85 #else
86 #ifdef _LIBC
87 extern unsigned long time();
88 extern int write();
89 #endif
90 const unsigned char *buf=_buf;
91 long rnum;
92 int i,j,k,outnum;
93 static unsigned char *outbuf=NULL;
94 unsigned char shortbuf[8];
95 unsigned char *p;
96 const unsigned char *cp;
97 static int start=1;
98
99 if (outbuf == NULL)
100 {
101 outbuf=OPENSSL_malloc(BSIZE+HDRSIZE);
102 if (outbuf == NULL) return(-1);
103 }
104 /* If we are sending less than 8 bytes, the same char will look
105 * the same if we don't pad it out with random bytes */
106 if (start)
107 {
108 start=0;
109 }
110
111 /* lets recurse if we want to send the data in small chunks */
112 if (len > MAXWRITE)
113 {
114 j=0;
115 for (i=0; i<len; i+=k)
116 {
117 k=DES_enc_write(fd,&(buf[i]),
118 ((len-i) > MAXWRITE)?MAXWRITE:(len-i),sched,iv);
119 if (k < 0)
120 return(k);
121 else
122 j+=k;
123 }
124 return(j);
125 }
126
127 /* write length first */
128 p=outbuf;
129 l2n(len,p);
130
131 /* pad short strings */
132 if (len < 8)
133 {
134 cp=shortbuf;
135 memcpy(shortbuf,buf,len);
136 RAND_pseudo_bytes(shortbuf+len, 8-len);
137 rnum=8;
138 }
139 else
140 {
141 cp=buf;
142 rnum=((len+7)/8*8); /* round up to nearest eight */
143 }
144
145 if (DES_rw_mode & DES_PCBC_MODE)
146 DES_pcbc_encrypt(cp,&(outbuf[HDRSIZE]),(len<8)?8:len,sched,iv,
147 DES_ENCRYPT);
148 else
149 DES_cbc_encrypt(cp,&(outbuf[HDRSIZE]),(len<8)?8:len,sched,iv,
150 DES_ENCRYPT);
151
152 /* output */
153 outnum=rnum+HDRSIZE;
154
155 for (j=0; j<outnum; j+=i)
156 {
157 /* eay 26/08/92 I was not doing writing from where we
158 * got up to. */
159 #ifndef _WIN32
160 i=write(fd,(void *)&(outbuf[j]),outnum-j);
161 #else
162 i=_write(fd,(void *)&(outbuf[j]),outnum-j);
163 #endif
164 if (i == -1)
165 {
166 #ifdef EINTR
167 if (errno == EINTR)
168 i=0;
169 else
170 #endif
171 /* This is really a bad error - very bad
172 * It will stuff-up both ends. */
173 return(-1);
174 }
175 }
176
177 return(len);
178 #endif /* OPENSSL_NO_POSIX_IO */
179 }