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