des_enc_write(fd,buf,len,sched,iv)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
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 int srandom();
72 extern unsigned long time();
73 extern int random();
74 extern int write();
75 #endif
76
77 long rnum;
78 int i,j,k,outnum;
79 char *outbuf=NULL;
80 char shortbuf[8];
81 char *p;
82 static int start=1;
83
84 if (outbuf == NULL)
85 {
86 outbuf=(char *)malloc(BSIZE+HDRSIZE);
87 if (outbuf == NULL) return(-1);
88 }
89 /* If we are sending less than 8 bytes, the same char will look
90 * the same if we don't pad it out with random bytes */
91 if (start)
92 {
93 start=0;
94 srandom((unsigned int)time(NULL));
95 }
96
97 /* lets recurse if we want to send the data in small chunks */
98 if (len > MAXWRITE)
99 {
100 j=0;
101 for (i=0; i<len; i+=k)
102 {
103 k=des_enc_write(fd,&(buf[i]),
104 ((len-i) > MAXWRITE)?MAXWRITE:(len-i),sched,iv);
105 if (k < 0)
106 return(k);
107 else
108 j+=k;
109 }
110 return(j);
111 }
112
113 /* write length first */
114 p=outbuf;
115 l2n(len,p);
116
117 /* pad short strings */
118 if (len < 8)
119 {
120 p=shortbuf;
121 memcpy(shortbuf,buf,(unsigned int)len);
122 for (i=len; i<8; i++)
123 shortbuf[i]=random();
124 rnum=8;
125 }
126 else
127 {
128 p=buf;
129 rnum=((len+7)/8*8); /* round up to nearest eight */
130 }
131
132 if (des_rw_mode & DES_PCBC_MODE)
133 des_pcbc_encrypt((des_cblock *)p,
134 (des_cblock *)&(outbuf[HDRSIZE]),
135 (long)((len<8)?8:len),sched,iv,DES_ENCRYPT);
136 else
137 des_cbc_encrypt((des_cblock *)p,
138 (des_cblock *)&(outbuf[HDRSIZE]),
139 (long)((len<8)?8:len),sched,iv,DES_ENCRYPT);
140
141 /* output */
142 outnum=(int)rnum+HDRSIZE;
143
144 for (j=0; j<outnum; j+=i)
145 {
146 /* eay 26/08/92 I was not doing writing from where we
147 * got upto. */
148 i=write(fd,&(outbuf[j]),(unsigned int)(outnum-j));
149 if (i == -1)
150 {
151 if (errno == EINTR)
152 i=0;
153 else /* This is really a bad error - very bad
154 * It will stuff-up both ends. */
155 return(-1);
156 }
157 }
158
159 return(len);
160 }
161