| /* 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 <openssl/opensslconf.h> |
| #if !defined(OPENSSL_SYS_STARBOARD) |
| #include <errno.h> |
| #include <stdio.h> |
| #include <time.h> |
| #endif // !defined(OPENSSL_SYS_STARBOARD) |
| #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 OPENSSL_port_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; |
| OPENSSL_port_memcpy(shortbuf, buf, len); |
| if (RAND_pseudo_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 (OPENSSL_port_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 */ |
| } |
