1 /* crypto/des/enc_writ.c */
2 /* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@mincom.oz.au).
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@mincom.oz.au).
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@mincom.oz.au)"
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@mincom.oz.au)"
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 "des_locl.h"
62
des_enc_write(fd,buf,len,sched,iv)63 int des_enc_write(fd, buf, len, sched, iv)
64 int fd;
65 char *buf;
66 int len;
67 des_key_schedule sched;
68 des_cblock (*iv);
69 {
70 #ifdef _LIBC
71 extern unsigned long time();
72 extern int write();
73 #endif
74
75 long rnum;
76 int i,j,k,outnum;
77 static char *outbuf=NULL;
78 char shortbuf[8];
79 char *p;
80 static int start=1;
81
82 if (outbuf == NULL)
83 {
84 outbuf=(char *)malloc(BSIZE+HDRSIZE);
85 if (outbuf == NULL) return(-1);
86 }
87 /* If we are sending less than 8 bytes, the same char will look
88 * the same if we don't pad it out with random bytes */
89 if (start)
90 {
91 start=0;
92 }
93
94 /* lets recurse if we want to send the data in small chunks */
95 if (len > MAXWRITE)
96 {
97 j=0;
98 for (i=0; i<len; i+=k)
99 {
100 k=des_enc_write(fd,&(buf[i]),
101 ((len-i) > MAXWRITE)?MAXWRITE:(len-i),sched,iv);
102 if (k < 0)
103 return(k);
104 else
105 j+=k;
106 }
107 return(j);
108 }
109
110 /* write length first */
111 p=outbuf;
112 l2n(len,p);
113
114 /* pad short strings */
115 if (len < 8)
116 {
117 p=shortbuf;
118 memcpy(shortbuf,buf,(unsigned int)len);
119 for (i=len; i<8; i++)
120 shortbuf[i] = arc4random() & 0xFF;
121 rnum=8;
122 }
123 else
124 {
125 p=buf;
126 rnum=((len+7)/8*8); /* round up to nearest eight */
127 }
128
129 if (des_rw_mode & DES_PCBC_MODE)
130 des_pcbc_encrypt((des_cblock *)p,
131 (des_cblock *)&(outbuf[HDRSIZE]),
132 (long)((len<8)?8:len),sched,iv,DES_ENCRYPT);
133 else
134 des_cbc_encrypt((des_cblock *)p,
135 (des_cblock *)&(outbuf[HDRSIZE]),
136 (long)((len<8)?8:len),sched,iv,DES_ENCRYPT);
137
138 /* output */
139 outnum=(int)rnum+HDRSIZE;
140
141 for (j=0; j<outnum; j+=i)
142 {
143 /* eay 26/08/92 I was not doing writing from where we
144 * got upto. */
145 i=write(fd,&(outbuf[j]),(unsigned int)(outnum-j));
146 if (i == -1)
147 {
148 if (errno == EINTR)
149 i=0;
150 else /* This is really a bad error - very bad
151 * It will stuff-up both ends. */
152 return(-1);
153 }
154 }
155
156 return(len);
157 }
158