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182 lines
6.3 KiB
182 lines
6.3 KiB
/* 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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|
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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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