A local copy of OpenSSL from GitHub
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
 

180 lines
6.3 KiB

/* 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 "internal/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 (len < 0)
return -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);
if (RAND_bytes(shortbuf + len, 8 - len) <= 0)
return -1;
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 */
}