177 lines
6.2 KiB
C
177 lines
6.2 KiB
C
/* crypto/des/enc_writ.c */
|
|
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
|
|
* All rights reserved.
|
|
*
|
|
* This package is an SSL implementation written
|
|
* by Eric Young (eay@cryptsoft.com).
|
|
* The implementation was written so as to conform with Netscapes SSL.
|
|
*
|
|
* This library is free for commercial and non-commercial use as long as
|
|
* the following conditions are aheared to. The following conditions
|
|
* apply to all code found in this distribution, be it the RC4, RSA,
|
|
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
|
|
* included with this distribution is covered by the same copyright terms
|
|
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
|
|
*
|
|
* Copyright remains Eric Young's, and as such any Copyright notices in
|
|
* the code are not to be removed.
|
|
* If this package is used in a product, Eric Young should be given attribution
|
|
* as the author of the parts of the library used.
|
|
* This can be in the form of a textual message at program startup or
|
|
* in documentation (online or textual) provided with the package.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* "This product includes cryptographic software written by
|
|
* Eric Young (eay@cryptsoft.com)"
|
|
* The word 'cryptographic' can be left out if the rouines from the library
|
|
* being used are not cryptographic related :-).
|
|
* 4. If you include any Windows specific code (or a derivative thereof) from
|
|
* the apps directory (application code) you must include an acknowledgement:
|
|
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* The licence and distribution terms for any publically available version or
|
|
* derivative of this code cannot be changed. i.e. this code cannot simply be
|
|
* copied and put under another distribution licence
|
|
* [including the GNU Public Licence.]
|
|
*/
|
|
|
|
#include <errno.h>
|
|
#include <time.h>
|
|
#include <stdio.h>
|
|
#include "cryptlib.h"
|
|
#include "des_locl.h"
|
|
#include <openssl/rand.h>
|
|
|
|
/*-
|
|
* WARNINGS:
|
|
*
|
|
* - The data format used by DES_enc_write() and DES_enc_read()
|
|
* has a cryptographic weakness: When asked to write more
|
|
* than MAXWRITE bytes, DES_enc_write will split the data
|
|
* into several chunks that are all encrypted
|
|
* using the same IV. So don't use these functions unless you
|
|
* are sure you know what you do (in which case you might
|
|
* not want to use them anyway).
|
|
*
|
|
* - This code cannot handle non-blocking sockets.
|
|
*/
|
|
|
|
int DES_enc_write(int fd, const void *_buf, int len,
|
|
DES_key_schedule *sched, DES_cblock *iv)
|
|
{
|
|
#if defined(OPENSSL_NO_POSIX_IO)
|
|
return (-1);
|
|
#else
|
|
# ifdef _LIBC
|
|
extern unsigned long time();
|
|
extern int write();
|
|
# endif
|
|
const unsigned char *buf = _buf;
|
|
long rnum;
|
|
int i, j, k, outnum;
|
|
static unsigned char *outbuf = NULL;
|
|
unsigned char shortbuf[8];
|
|
unsigned char *p;
|
|
const unsigned char *cp;
|
|
static int start = 1;
|
|
|
|
if (outbuf == NULL) {
|
|
outbuf = OPENSSL_malloc(BSIZE + HDRSIZE);
|
|
if (outbuf == NULL)
|
|
return (-1);
|
|
}
|
|
/*
|
|
* If we are sending less than 8 bytes, the same char will look the same
|
|
* if we don't pad it out with random bytes
|
|
*/
|
|
if (start) {
|
|
start = 0;
|
|
}
|
|
|
|
/* lets recurse if we want to send the data in small chunks */
|
|
if (len > MAXWRITE) {
|
|
j = 0;
|
|
for (i = 0; i < len; i += k) {
|
|
k = DES_enc_write(fd, &(buf[i]),
|
|
((len - i) > MAXWRITE) ? MAXWRITE : (len - i),
|
|
sched, iv);
|
|
if (k < 0)
|
|
return (k);
|
|
else
|
|
j += k;
|
|
}
|
|
return (j);
|
|
}
|
|
|
|
/* write length first */
|
|
p = outbuf;
|
|
l2n(len, p);
|
|
|
|
/* pad short strings */
|
|
if (len < 8) {
|
|
cp = shortbuf;
|
|
memcpy(shortbuf, buf, len);
|
|
RAND_pseudo_bytes(shortbuf + len, 8 - len);
|
|
rnum = 8;
|
|
} else {
|
|
cp = buf;
|
|
rnum = ((len + 7) / 8 * 8); /* round up to nearest eight */
|
|
}
|
|
|
|
if (DES_rw_mode & DES_PCBC_MODE)
|
|
DES_pcbc_encrypt(cp, &(outbuf[HDRSIZE]), (len < 8) ? 8 : len, sched,
|
|
iv, DES_ENCRYPT);
|
|
else
|
|
DES_cbc_encrypt(cp, &(outbuf[HDRSIZE]), (len < 8) ? 8 : len, sched,
|
|
iv, DES_ENCRYPT);
|
|
|
|
/* output */
|
|
outnum = rnum + HDRSIZE;
|
|
|
|
for (j = 0; j < outnum; j += i) {
|
|
/*
|
|
* eay 26/08/92 I was not doing writing from where we got up to.
|
|
*/
|
|
# ifndef _WIN32
|
|
i = write(fd, (void *)&(outbuf[j]), outnum - j);
|
|
# else
|
|
i = _write(fd, (void *)&(outbuf[j]), outnum - j);
|
|
# endif
|
|
if (i == -1) {
|
|
# ifdef EINTR
|
|
if (errno == EINTR)
|
|
i = 0;
|
|
else
|
|
# endif
|
|
/*
|
|
* This is really a bad error - very bad It will stuff-up
|
|
* both ends.
|
|
*/
|
|
return (-1);
|
|
}
|
|
}
|
|
|
|
return (len);
|
|
#endif /* OPENSSL_NO_POSIX_IO */
|
|
}
|