1 /* crypto/des/enc_writ.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
67 * - The data format used by des_enc_write() and des_enc_read()
68 * has a cryptographic weakness: When asked to write more
69 * than MAXWRITE bytes, des_enc_write will split the data
70 * into several chunks that are all encrypted
71 * using the same IV. So don't use these functions unless you
72 * are sure you know what you do (in which case you might
73 * not want to use them anyway).
75 * - This code cannot handle non-blocking sockets.
78 int des_enc_write(int fd
, const void *_buf
, int len
,
79 des_key_schedule sched
, des_cblock
*iv
)
82 extern unsigned long time();
85 const unsigned char *buf
=_buf
;
88 static unsigned char *outbuf
=NULL
;
89 unsigned char shortbuf
[8];
91 const unsigned char *cp
;
96 outbuf
=OPENSSL_malloc(BSIZE
+HDRSIZE
);
97 if (outbuf
== NULL
) return(-1);
99 /* If we are sending less than 8 bytes, the same char will look
100 * the same if we don't pad it out with random bytes */
106 /* lets recurse if we want to send the data in small chunks */
110 for (i
=0; i
<len
; i
+=k
)
112 k
=des_enc_write(fd
,&(buf
[i
]),
113 ((len
-i
) > MAXWRITE
)?MAXWRITE
:(len
-i
),sched
,iv
);
122 /* write length first */
126 /* pad short strings */
130 memcpy(shortbuf
,buf
,len
);
131 *(u_int32_t
*)&shortbuf
[0] = arc4random();
132 *(u_int32_t
*)&shortbuf
[4] = arc4random();
138 rnum
=((len
+7)/8*8); /* round up to nearest eight */
141 if (des_rw_mode
& DES_PCBC_MODE
)
142 des_pcbc_encrypt(cp
,&(outbuf
[HDRSIZE
]),(len
<8)?8:len
,sched
,iv
,
145 des_cbc_encrypt(cp
,&(outbuf
[HDRSIZE
]),(len
<8)?8:len
,sched
,iv
,
151 for (j
=0; j
<outnum
; j
+=i
)
153 /* eay 26/08/92 I was not doing writing from where we
155 i
=write(fd
,(void *)&(outbuf
[j
]),outnum
-j
);
163 /* This is really a bad error - very bad
164 * It will stuff-up both ends. */