lib/libcrypto/des/enc_writ.c

   1 /* $OpenBSD: enc_writ.c,v 1.14 2015/02/12 03:54:07 jsing Exp $ */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <errno.h>
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include <time.h>
  63
  64 #include <openssl/opensslconf.h>
  65
  66 #include "des_locl.h"
  67
  68 /*
  69  * WARNINGS:
  70  *
  71  *  -  The data format used by DES_enc_write() and DES_enc_read()
  72  *     has a cryptographic weakness: When asked to write more
  73  *     than MAXWRITE bytes, DES_enc_write will split the data
  74  *     into several chunks that are all encrypted
  75  *     using the same IV.  So don't use these functions unless you
  76  *     are sure you know what you do (in which case you might
  77  *     not want to use them anyway).
  78  *
  79  *  -  This code cannot handle non-blocking sockets.
  80  */
  81
  82 int DES_enc_write(int fd, const void *_buf, int len,
  83                   DES_key_schedule *sched, DES_cblock *iv)
  84         {
  85 #ifdef _LIBC
  86         extern unsigned long time();
  87         extern int write();
  88 #endif
  89         const unsigned char *buf=_buf;
  90         long rnum;
  91         int i,j,k,outnum;
  92         static unsigned char *outbuf=NULL;
  93         unsigned char shortbuf[8];
  94         unsigned char *p;
  95         const unsigned char *cp;
  96         static int start=1;
  97
  98         if (outbuf == NULL)
  99                 {
 100                 outbuf=malloc(BSIZE+HDRSIZE);
 101                 if (outbuf == NULL) return(-1);
 102                 }
 103         /* If we are sending less than 8 bytes, the same char will look
 104          * the same if we don't pad it out with random bytes */
 105         if (start)
 106                 {
 107                 start=0;
 108                 }
 109
 110         /* lets recurse if we want to send the data in small chunks */
 111         if (len > MAXWRITE)
 112                 {
 113                 j=0;
 114                 for (i=0; i<len; i+=k)
 115                         {
 116                         k=DES_enc_write(fd,&(buf[i]),
 117                                 ((len-i) > MAXWRITE)?MAXWRITE:(len-i),sched,iv);
 118                         if (k < 0)
 119                                 return(k);
 120                         else
 121                                 j+=k;
 122                         }
 123                 return(j);
 124                 }
 125
 126         /* write length first */
 127         p=outbuf;
 128         l2n(len,p);
 129
 130         /* pad short strings */
 131         if (len < 8)
 132                 {
 133                 cp=shortbuf;
 134                 memcpy(shortbuf,buf,len);
 135                 arc4random_buf(shortbuf+len, 8-len);
 136                 rnum=8;
 137                 }
 138         else
 139                 {
 140                 cp=buf;
 141                 rnum=((len+7)/8*8); /* round up to nearest eight */
 142                 }
 143
 144         if (DES_rw_mode & DES_PCBC_MODE)
 145                 DES_pcbc_encrypt(cp,&(outbuf[HDRSIZE]),(len<8)?8:len,sched,iv,
 146                                  DES_ENCRYPT);
 147         else
 148                 DES_cbc_encrypt(cp,&(outbuf[HDRSIZE]),(len<8)?8:len,sched,iv,
 149                                 DES_ENCRYPT);
 150
 151         /* output */
 152         outnum=rnum+HDRSIZE;
 153
 154         for (j=0; j<outnum; j+=i)
 155                 {
 156                 /* eay 26/08/92 I was not doing writing from where we
 157                  * got up to. */
 158                 i=write(fd,(void *)&(outbuf[j]),outnum-j);
 159                 if (i == -1)
 160                         {
 161 #ifdef EINTR
 162                         if (errno == EINTR)
 163                                 i=0;
 164                         else
 165 #endif
 166                                 /* This is really a bad error - very bad
 167                                  * It will stuff-up both ends. */
 168                                 return(-1);
 169                         }
 170                 }
 171
 172         return(len);
 173         }